Merge pull request #796 from quantified-uncertainty/collapsible

Collapsible records in playground output

packages/components/README.md

@@ -54,7 +54,6 @@ export function DynamicSquiggleChart({ squiggleString }) {
           width={445}
           height={200}
           showSummary={true}
-          showTypes={true}
         />
     );
   }

packages/components/package.json

@@ -3,6 +3,8 @@
   "version": "0.2.23",
   "license": "MIT",
   "dependencies": {
+    "@floating-ui/react-dom": "^0.7.2",
+    "@floating-ui/react-dom-interactions": "^0.6.6",
     "@headlessui/react": "^1.6.6",
     "@heroicons/react": "^1.0.6",
     "@hookform/resolvers": "^2.9.6",

packages/components/src/components/DistributionChart.tsx

@@ -8,26 +8,24 @@ import {
 import { Vega } from "react-vega";
 import { ErrorAlert } from "./Alert";
 import { useSize } from "react-use";
-import clsx from "clsx";
 
 import {
   buildVegaSpec,
   DistributionChartSpecOptions,
 } from "../lib/distributionSpecBuilder";
 import { NumberShower } from "./NumberShower";
+import { hasMassBelowZero } from "../lib/distributionUtils";
 
 export type DistributionPlottingSettings = {
   /** Whether to show a summary of means, stdev, percentiles etc */
   showSummary: boolean;
-  /** Whether to show the user graph controls (scale etc) */
+  actions?: boolean;
-  showControls: boolean;
 } & DistributionChartSpecOptions;
 
 export type DistributionChartProps = {
   distribution: Distribution;
   width?: number;
   height: number;
-  actions?: boolean;
 } & DistributionPlottingSettings;
 
 export const DistributionChart: React.FC<DistributionChartProps> = (props) => {
@@ -36,17 +34,9 @@ export const DistributionChart: React.FC<DistributionChartProps> = (props) => {
     height,
     showSummary,
     width,
-    showControls,
     logX,
-    expY,
     actions = false,
   } = props;
-  const [isLogX, setLogX] = React.useState(logX);
-  const [isExpY, setExpY] = React.useState(expY);
-
-  React.useEffect(() => setLogX(logX), [logX]);
-  React.useEffect(() => setExpY(expY), [expY]);
-
   const shape = distribution.pointSet();
   const [sized] = useSize((size) => {
     if (shape.tag === "Error") {
@@ -57,9 +47,6 @@ export const DistributionChart: React.FC<DistributionChartProps> = (props) => {
       );
     }
 
-    const massBelow0 =
-      shape.value.continuous.some((x) => x.x <= 0) ||
-      shape.value.discrete.some((x) => x.x <= 0);
     const spec = buildVegaSpec(props);
 
     let widthProp = width ? width : size.width;
@@ -72,7 +59,11 @@ export const DistributionChart: React.FC<DistributionChartProps> = (props) => {
 
     return (
       <div style={{ width: widthProp }}>
-        {!(isLogX && massBelow0) ? (
+        {logX && hasMassBelowZero(shape.value) ? (
+          <ErrorAlert heading="Log Domain Error">
+            Cannot graph distribution with negative values on logarithmic scale.
+          </ErrorAlert>
+        ) : (
           <Vega
             spec={spec}
             data={{ con: shape.value.continuous, dis: shape.value.discrete }}
@@ -80,67 +71,16 @@ export const DistributionChart: React.FC<DistributionChartProps> = (props) => {
             height={height}
             actions={actions}
           />
-        ) : (
-          <ErrorAlert heading="Log Domain Error">
-            Cannot graph distribution with negative values on logarithmic scale.
-          </ErrorAlert>
         )}
         <div className="flex justify-center">
           {showSummary && <SummaryTable distribution={distribution} />}
         </div>
-        {showControls && (
-          <div>
-            <CheckBox
-              label="Log X scale"
-              value={isLogX}
-              onChange={setLogX}
-              // Check whether we should disable the checkbox
-              {...(massBelow0
-                ? {
-                    disabled: true,
-                    tooltip:
-                      "Your distribution has mass lower than or equal to 0. Log only works on strictly positive values.",
-                  }
-                : {})}
-            />
-            <CheckBox label="Exp Y scale" value={isExpY} onChange={setExpY} />
-          </div>
-        )}
       </div>
     );
   });
   return sized;
 };
 
-interface CheckBoxProps {
-  label: string;
-  onChange: (x: boolean) => void;
-  value: boolean;
-  disabled?: boolean;
-  tooltip?: string;
-}
-
-export const CheckBox: React.FC<CheckBoxProps> = ({
-  label,
-  onChange,
-  value,
-  disabled = false,
-  tooltip,
-}) => {
-  return (
-    <span title={tooltip}>
-      <input
-        type="checkbox"
-        checked={value}
-        onChange={() => onChange(!value)}
-        disabled={disabled}
-        className="form-checkbox"
-      />
-      <label className={clsx(disabled && "text-slate-400")}> {label}</label>
-    </span>
-  );
-};
-
 const TableHeadCell: React.FC<{ children: React.ReactNode }> = ({
   children,
 }) => (

packages/components/src/components/SquiggleChart.tsx

@@ -9,8 +9,7 @@ import {
   defaultEnvironment,
 } from "@quri/squiggle-lang";
 import { useSquiggle } from "../lib/hooks";
-import { SquiggleErrorAlert } from "./SquiggleErrorAlert";
+import { SquiggleViewer } from "./SquiggleViewer";
-import { SquiggleItem } from "./SquiggleItem";
 
 export interface SquiggleChartProps {
   /** The input string for squiggle */
@@ -36,10 +35,6 @@ export interface SquiggleChartProps {
   jsImports?: jsImports;
   /** Whether to show a summary of the distribution */
   showSummary?: boolean;
-  /** Whether to show type information about returns, default false */
-  showTypes?: boolean;
-  /** Whether to show graph controls (scale etc)*/
-  showControls?: boolean;
   /** Set the x scale to be logarithmic by deault */
   logX?: boolean;
   /** Set the y scale to be exponential by deault */
@@ -56,6 +51,7 @@ export interface SquiggleChartProps {
   maxX?: number;
   /** Whether to show vega actions to the user, so they can copy the chart spec */
   distributionChartActions?: boolean;
+  enableLocalSettings?: boolean;
 }
 
 const defaultOnChange = () => {};
@@ -70,8 +66,6 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = React.memo(
     jsImports = defaultImports,
     showSummary = false,
     width,
-    showTypes = false,
-    showControls = false,
     logX = false,
     expY = false,
     diagramStart = 0,
@@ -83,6 +77,7 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = React.memo(
     color,
     title,
     distributionChartActions,
+    enableLocalSettings = false,
   }) => {
     const result = useSquiggle({
       code,
@@ -92,12 +87,7 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = React.memo(
       onChange,
     });
 
-    if (result.tag !== "Ok") {
+    const distributionPlotSettings = {
-      return <SquiggleErrorAlert error={result.value} />;
-    }
-
-    let distributionPlotSettings = {
-      showControls,
       showSummary,
       logX,
       expY,
@@ -109,21 +99,21 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = React.memo(
       actions: distributionChartActions,
     };
 
-    let chartSettings = {
+    const chartSettings = {
       start: diagramStart,
       stop: diagramStop,
       count: diagramCount,
     };
 
     return (
-      <SquiggleItem
+      <SquiggleViewer
-        expression={result.value}
+        result={result}
         width={width}
         height={height}
         distributionPlotSettings={distributionPlotSettings}
-        showTypes={showTypes}
         chartSettings={chartSettings}
         environment={environment ?? defaultEnvironment}
+        enableLocalSettings={enableLocalSettings}
       />
     );
   }

packages/components/src/components/SquiggleContainer.tsx

@@ -13,6 +13,7 @@ const SquiggleContext = React.createContext<SquiggleContextShape>({
 
 export const SquiggleContainer: React.FC<Props> = ({ children }) => {
   const context = useContext(SquiggleContext);
+
   if (context.containerized) {
     return <>{children}</>;
   } else {

packages/components/src/components/SquigglePlayground.tsx

@@ -1,5 +1,12 @@
-import React, { FC, useState, useEffect, useMemo } from "react";
+import React, {
-import { Path, useForm, UseFormRegister, useWatch } from "react-hook-form";
+  FC,
+  useState,
+  useEffect,
+  useMemo,
+  useRef,
+  useCallback,
+} from "react";
+import { useForm, UseFormRegister, useWatch } from "react-hook-form";
 import * as yup from "yup";
 import { useMaybeControlledValue } from "../lib/hooks";
 import { yupResolver } from "@hookform/resolvers/yup";
@@ -24,13 +31,19 @@ import { JsonEditor } from "./JsonEditor";
 import { ErrorAlert, SuccessAlert } from "./Alert";
 import { SquiggleContainer } from "./SquiggleContainer";
 import { Toggle } from "./ui/Toggle";
-import { Checkbox } from "./ui/Checkbox";
 import { StyledTab } from "./ui/StyledTab";
+import { InputItem } from "./ui/InputItem";
+import { Text } from "./ui/Text";
+import { ViewSettings, viewSettingsSchema } from "./ViewSettings";
+import { HeadedSection } from "./ui/HeadedSection";
+import {
+  defaultColor,
+  defaultTickFormat,
+} from "../lib/distributionSpecBuilder";
 
 type PlaygroundProps = SquiggleChartProps & {
   /** The initial squiggle string to put in the playground */
   defaultCode?: string;
-  /** How many pixels high is the playground */
   onCodeChange?(expr: string): void;
   /* When settings change */
   onSettingsChange?(settings: any): void;
@@ -38,7 +51,9 @@ type PlaygroundProps = SquiggleChartProps & {
   showEditor?: boolean;
 };
 
-const schema = yup.object({}).shape({
+const schema = yup
+  .object({})
+  .shape({
     sampleCount: yup
       .number()
       .required()
@@ -55,74 +70,11 @@ const schema = yup.object({}).shape({
       .default(1000)
       .min(10)
       .max(10000),
-  chartHeight: yup.number().required().positive().integer().default(350),
+  })
-  leftSizePercent: yup
+  .concat(viewSettingsSchema);
-    .number()
-    .required()
-    .positive()
-    .integer()
-    .min(10)
-    .max(100)
-    .default(50),
-  showTypes: yup.boolean().required(),
-  showControls: yup.boolean().required(),
-  showSummary: yup.boolean().required(),
-  showEditor: yup.boolean().required(),
-  logX: yup.boolean().required(),
-  expY: yup.boolean().required(),
-  tickFormat: yup.string().default(".9~s"),
-  title: yup.string(),
-  color: yup.string().default("#739ECC").required(),
-  minX: yup.number(),
-  maxX: yup.number(),
-  distributionChartActions: yup.boolean(),
-  showSettingsPage: yup.boolean().default(false),
-  diagramStart: yup.number().required().positive().integer().default(0).min(0),
-  diagramStop: yup.number().required().positive().integer().default(10).min(0),
-  diagramCount: yup.number().required().positive().integer().default(20).min(2),
-});
 
 type FormFields = yup.InferType<typeof schema>;
 
-const HeadedSection: FC<{ title: string; children: React.ReactNode }> = ({
-  title,
-  children,
-}) => (
-  <div>
-    <header className="text-lg leading-6 font-medium text-gray-900">
-      {title}
-    </header>
-    <div className="mt-4">{children}</div>
-  </div>
-);
-
-const Text: FC<{ children: React.ReactNode }> = ({ children }) => (
-  <p className="text-sm text-gray-500">{children}</p>
-);
-
-function InputItem<T>({
-  name,
-  label,
-  type,
-  register,
-}: {
-  name: Path<T>;
-  label: string;
-  type: "number" | "text" | "color";
-  register: UseFormRegister<T>;
-}) {
-  return (
-    <label className="block">
-      <div className="text-sm font-medium text-gray-600 mb-1">{label}</div>
-      <input
-        type={type}
-        {...register(name, { valueAsNumber: type === "number" })}
-        className="form-input max-w-lg block w-full shadow-sm focus:ring-indigo-500 focus:border-indigo-500 sm:max-w-xs sm:text-sm border-gray-300 rounded-md"
-      />
-    </label>
-  );
-}
-
 const SamplingSettings: React.FC<{ register: UseFormRegister<FormFields> }> = ({
   register,
 }) => (
@@ -158,128 +110,6 @@ const SamplingSettings: React.FC<{ register: UseFormRegister<FormFields> }> = ({
   </div>
 );
 
-const ViewSettings: React.FC<{ register: UseFormRegister<FormFields> }> = ({
-  register,
-}) => (
-  <div className="space-y-6 p-3 divide-y divide-gray-200 max-w-xl">
-    <HeadedSection title="General Display Settings">
-      <div className="space-y-4">
-        <Checkbox
-          name="showEditor"
-          register={register}
-          label="Show code editor on left"
-        />
-        <InputItem
-          name="chartHeight"
-          type="number"
-          register={register}
-          label="Chart Height (in pixels)"
-        />
-        <Checkbox
-          name="showTypes"
-          register={register}
-          label="Show information about displayed types"
-        />
-      </div>
-    </HeadedSection>
-
-    <div className="pt-8">
-      <HeadedSection title="Distribution Display Settings">
-        <div className="space-y-2">
-          <Checkbox
-            register={register}
-            name="logX"
-            label="Show x scale logarithmically"
-          />
-          <Checkbox
-            register={register}
-            name="expY"
-            label="Show y scale exponentially"
-          />
-          <Checkbox
-            register={register}
-            name="distributionChartActions"
-            label="Show vega chart controls"
-          />
-          <Checkbox
-            register={register}
-            name="showControls"
-            label="Show toggles to adjust scale of x and y axes"
-          />
-          <Checkbox
-            register={register}
-            name="showSummary"
-            label="Show summary statistics"
-          />
-          <InputItem
-            name="minX"
-            type="number"
-            register={register}
-            label="Min X Value"
-          />
-          <InputItem
-            name="maxX"
-            type="number"
-            register={register}
-            label="Max X Value"
-          />
-          <InputItem
-            name="title"
-            type="text"
-            register={register}
-            label="Title"
-          />
-          <InputItem
-            name="tickFormat"
-            type="text"
-            register={register}
-            label="Tick Format"
-          />
-          <InputItem
-            name="color"
-            type="color"
-            register={register}
-            label="Color"
-          />
-        </div>
-      </HeadedSection>
-    </div>
-
-    <div className="pt-8">
-      <HeadedSection title="Function Display Settings">
-        <div className="space-y-6">
-          <Text>
-            When displaying functions of single variables that return numbers or
-            distributions, we need to use defaults for the x-axis. We need to
-            select a minimum and maximum value of x to sample, and a number n of
-            the number of points to sample.
-          </Text>
-          <div className="space-y-4">
-            <InputItem
-              type="number"
-              name="diagramStart"
-              register={register}
-              label="Min X Value"
-            />
-            <InputItem
-              type="number"
-              name="diagramStop"
-              register={register}
-              label="Max X Value"
-            />
-            <InputItem
-              type="number"
-              name="diagramCount"
-              register={register}
-              label="Points between X min and X max to sample"
-            />
-          </div>
-        </div>
-      </HeadedSection>
-    </div>
-  </div>
-);
-
 const InputVariablesSettings: React.FC<{
   initialImports: any; // TODO - any json type
   setImports: (imports: any) => void;
@@ -406,19 +236,24 @@ const useRunnerState = (code: string) => {
   };
 };
 
+type PlaygroundContextShape = {
+  getLeftPanelElement: () => HTMLDivElement | undefined;
+};
+export const PlaygroundContext = React.createContext<PlaygroundContextShape>({
+  getLeftPanelElement: () => undefined,
+});
+
 export const SquigglePlayground: FC<PlaygroundProps> = ({
   defaultCode = "",
   height = 500,
-  showTypes = false,
-  showControls = false,
   showSummary = false,
   logX = false,
   expY = false,
   title,
   minX,
   maxX,
-  color = "#739ECC",
+  color = defaultColor,
-  tickFormat = ".9~s",
+  tickFormat = defaultTickFormat,
   distributionChartActions,
   code: controlledCode,
   onCodeChange,
@@ -439,8 +274,6 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
       sampleCount: 1000,
       xyPointLength: 1000,
       chartHeight: 150,
-      showTypes,
-      showControls,
       logX,
       expY,
       title,
@@ -451,8 +284,6 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
       distributionChartActions,
       showSummary,
       showEditor,
-      leftSizePercent: 50,
-      showSettingsPage: false,
       diagramStart: 0,
       diagramStop: 10,
       diagramCount: 20,
@@ -484,6 +315,7 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
       {...vars}
       bindings={defaultBindings}
       jsImports={imports}
+      enableLocalSettings={true}
     />
   );
 
@@ -509,7 +341,15 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
         <SamplingSettings register={register} />
       </StyledTab.Panel>
       <StyledTab.Panel>
-        <ViewSettings register={register} />
+        <ViewSettings
+          register={
+            // This is dangerous, but doesn't cause any problems.
+            // I tried to make `ViewSettings` generic (to allow it to accept any extension of a settings schema), but it didn't work.
+            register as unknown as UseFormRegister<
+              yup.InferType<typeof viewSettingsSchema>
+            >
+          }
+        />
       </StyledTab.Panel>
       <StyledTab.Panel>
         <InputVariablesSettings
@@ -520,17 +360,30 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
     </StyledTab.Panels>
   );
 
+  const leftPanelRef = useRef<HTMLDivElement | null>(null);
+
   const withEditor = (
     <div className="flex mt-2">
-      <div className="w-1/2">{tabs}</div>
+      <div
+        className="w-1/2 relative"
+        style={{ minHeight: height }}
+        ref={leftPanelRef}
+      >
+        {tabs}
+      </div>
       <div className="w-1/2 p-2 pl-4">{squiggleChart}</div>
     </div>
   );
 
   const withoutEditor = <div className="mt-3">{tabs}</div>;
 
+  const getLeftPanelElement = useCallback(() => {
+    return leftPanelRef.current ?? undefined;
+  }, []);
+
   return (
     <SquiggleContainer>
+      <PlaygroundContext.Provider value={{ getLeftPanelElement }}>
         <StyledTab.Group>
           <div className="pb-4">
             <div className="flex justify-between items-center">
@@ -554,6 +407,7 @@ export const SquigglePlayground: FC<PlaygroundProps> = ({
             {vars.showEditor ? withEditor : withoutEditor}
           </div>
         </StyledTab.Group>
+      </PlaygroundContext.Provider>
     </SquiggleContainer>
   );
 };

packages/components/src/components/SquiggleViewer/ExpressionViewer.tsx

@@ -0,0 +1,291 @@
+import React from "react";
+import { squiggleExpression, declaration } from "@quri/squiggle-lang";
+import { NumberShower } from "../NumberShower";
+import { DistributionChart } from "../DistributionChart";
+import { FunctionChart, FunctionChartSettings } from "../FunctionChart";
+import clsx from "clsx";
+import { VariableBox } from "./VariableBox";
+import { ItemSettingsMenu } from "./ItemSettingsMenu";
+import { hasMassBelowZero } from "../../lib/distributionUtils";
+import { MergedItemSettings } from "./utils";
+
+function getRange<a>(x: declaration<a>) {
+  const first = x.args[0];
+  switch (first.tag) {
+    case "Float": {
+      return { floats: { min: first.value.min, max: first.value.max } };
+    }
+    case "Date": {
+      return { time: { min: first.value.min, max: first.value.max } };
+    }
+  }
+}
+
+function getChartSettings<a>(x: declaration<a>): FunctionChartSettings {
+  const range = getRange(x);
+  const min = range.floats ? range.floats.min : 0;
+  const max = range.floats ? range.floats.max : 10;
+  return {
+    start: min,
+    stop: max,
+    count: 20,
+  };
+}
+
+const VariableList: React.FC<{
+  path: string[];
+  heading: string;
+  children: (settings: MergedItemSettings) => React.ReactNode;
+}> = ({ path, heading, children }) => (
+  <VariableBox path={path} heading={heading}>
+    {(settings) => (
+      <div className={clsx("space-y-3", path.length ? "pt-1 mt-1" : null)}>
+        {children(settings)}
+      </div>
+    )}
+  </VariableBox>
+);
+
+export interface Props {
+  /** The output of squiggle's run */
+  expression: squiggleExpression;
+  /** Path to the current item, e.g. `['foo', 'bar', '3']` for `foo.bar[3]`; can be empty on the top-level item. */
+  path: string[];
+  width?: number;
+}
+
+export const ExpressionViewer: React.FC<Props> = ({
+  path,
+  expression,
+  width,
+}) => {
+  switch (expression.tag) {
+    case "number":
+      return (
+        <VariableBox path={path} heading="Number">
+          {() => (
+            <div className="font-semibold text-slate-600">
+              <NumberShower precision={3} number={expression.value} />
+            </div>
+          )}
+        </VariableBox>
+      );
+    case "distribution": {
+      const distType = expression.value.type();
+      return (
+        <VariableBox
+          path={path}
+          heading={`Distribution (${distType})\n${
+            distType === "Symbolic" ? expression.value.toString() : ""
+          }`}
+          renderSettingsMenu={({ onChange }) => {
+            const shape = expression.value.pointSet();
+            return (
+              <ItemSettingsMenu
+                path={path}
+                onChange={onChange}
+                disableLogX={
+                  shape.tag === "Ok" && hasMassBelowZero(shape.value)
+                }
+                withFunctionSettings={false}
+              />
+            );
+          }}
+        >
+          {(settings) => {
+            return (
+              <DistributionChart
+                distribution={expression.value}
+                {...settings.distributionPlotSettings}
+                height={settings.height}
+                width={width}
+              />
+            );
+          }}
+        </VariableBox>
+      );
+    }
+    case "string":
+      return (
+        <VariableBox path={path} heading="String">
+          {() => (
+            <>
+              <span className="text-slate-400">"</span>
+              <span className="text-slate-600 font-semibold font-mono">
+                {expression.value}
+              </span>
+              <span className="text-slate-400">"</span>
+            </>
+          )}
+        </VariableBox>
+      );
+    case "boolean":
+      return (
+        <VariableBox path={path} heading="Boolean">
+          {() => expression.value.toString()}
+        </VariableBox>
+      );
+    case "symbol":
+      return (
+        <VariableBox path={path} heading="Symbol">
+          {() => (
+            <>
+              <span className="text-slate-500 mr-2">Undefined Symbol:</span>
+              <span className="text-slate-600">{expression.value}</span>
+            </>
+          )}
+        </VariableBox>
+      );
+    case "call":
+      return (
+        <VariableBox path={path} heading="Call">
+          {() => expression.value}
+        </VariableBox>
+      );
+    case "arraystring":
+      return (
+        <VariableBox path={path} heading="Array String">
+          {() => expression.value.map((r) => `"${r}"`).join(", ")}
+        </VariableBox>
+      );
+    case "date":
+      return (
+        <VariableBox path={path} heading="Date">
+          {() => expression.value.toDateString()}
+        </VariableBox>
+      );
+    case "void":
+      return (
+        <VariableBox path={path} heading="Void">
+          {() => "Void"}
+        </VariableBox>
+      );
+    case "timeDuration": {
+      return (
+        <VariableBox path={path} heading="Time Duration">
+          {() => <NumberShower precision={3} number={expression.value} />}
+        </VariableBox>
+      );
+    }
+    case "lambda":
+      return (
+        <VariableBox
+          path={path}
+          heading="Function"
+          renderSettingsMenu={({ onChange }) => {
+            return (
+              <ItemSettingsMenu
+                path={path}
+                onChange={onChange}
+                withFunctionSettings={true}
+              />
+            );
+          }}
+        >
+          {(settings) => (
+            <>
+              <div className="text-amber-700 bg-amber-100 rounded-md font-mono p-1 pl-2 mb-3 mt-1 text-sm">{`function(${expression.value.parameters.join(
+                ","
+              )})`}</div>
+              <FunctionChart
+                fn={expression.value}
+                chartSettings={settings.chartSettings}
+                distributionPlotSettings={settings.distributionPlotSettings}
+                height={settings.height}
+                environment={{
+                  sampleCount: settings.environment.sampleCount / 10,
+                  xyPointLength: settings.environment.xyPointLength / 10,
+                }}
+              />
+            </>
+          )}
+        </VariableBox>
+      );
+    case "lambdaDeclaration": {
+      return (
+        <VariableBox
+          path={path}
+          heading="Function Declaration"
+          renderSettingsMenu={({ onChange }) => {
+            return (
+              <ItemSettingsMenu
+                onChange={onChange}
+                path={path}
+                withFunctionSettings={true}
+              />
+            );
+          }}
+        >
+          {(settings) => (
+            <FunctionChart
+              fn={expression.value.fn}
+              chartSettings={getChartSettings(expression.value)}
+              distributionPlotSettings={settings.distributionPlotSettings}
+              height={settings.height}
+              environment={{
+                sampleCount: settings.environment.sampleCount / 10,
+                xyPointLength: settings.environment.xyPointLength / 10,
+              }}
+            />
+          )}
+        </VariableBox>
+      );
+    }
+    case "module": {
+      return (
+        <VariableList path={path} heading="Module">
+          {(settings) =>
+            Object.entries(expression.value)
+              .filter(([key, r]) => !key.match(/^(Math|System)\./))
+              .map(([key, r]) => (
+                <ExpressionViewer
+                  key={key}
+                  path={[...path, key]}
+                  expression={r}
+                  width={width !== undefined ? width - 20 : width}
+                />
+              ))
+          }
+        </VariableList>
+      );
+    }
+    case "record":
+      return (
+        <VariableList path={path} heading="Record">
+          {(settings) =>
+            Object.entries(expression.value).map(([key, r]) => (
+              <ExpressionViewer
+                key={key}
+                path={[...path, key]}
+                expression={r}
+                width={width !== undefined ? width - 20 : width}
+              />
+            ))
+          }
+        </VariableList>
+      );
+    case "array":
+      return (
+        <VariableList path={path} heading="Array">
+          {(settings) =>
+            expression.value.map((r, i) => (
+              <ExpressionViewer
+                key={i}
+                path={[...path, String(i)]}
+                expression={r}
+                width={width !== undefined ? width - 20 : width}
+              />
+            ))
+          }
+        </VariableList>
+      );
+    default: {
+      return (
+        <div>
+          <span>No display for type: </span>{" "}
+          <span className="font-semibold text-slate-600">{expression.tag}</span>
+        </div>
+      );
+    }
+  }
+};

packages/components/src/components/SquiggleViewer/ItemSettingsMenu.tsx

@@ -0,0 +1,168 @@
+import { CogIcon } from "@heroicons/react/solid";
+import React, { useContext, useRef, useState, useEffect } from "react";
+import { useForm } from "react-hook-form";
+import { yupResolver } from "@hookform/resolvers/yup";
+import { Modal } from "../ui/Modal";
+import { ViewSettings, viewSettingsSchema } from "../ViewSettings";
+import { Path, pathAsString } from "./utils";
+import { ViewerContext } from "./ViewerContext";
+import {
+  defaultColor,
+  defaultTickFormat,
+} from "../../lib/distributionSpecBuilder";
+import { PlaygroundContext } from "../SquigglePlayground";
+
+type Props = {
+  path: Path;
+  onChange: () => void;
+  disableLogX?: boolean;
+  withFunctionSettings: boolean;
+};
+
+const ItemSettingsModal: React.FC<
+  Props & { close: () => void; resetScroll: () => void }
+> = ({
+  path,
+  onChange,
+  disableLogX,
+  withFunctionSettings,
+  close,
+  resetScroll,
+}) => {
+  const { setSettings, getSettings, getMergedSettings } =
+    useContext(ViewerContext);
+
+  const mergedSettings = getMergedSettings(path);
+
+  const { register, watch } = useForm({
+    resolver: yupResolver(viewSettingsSchema),
+    defaultValues: {
+      // this is a mess and should be fixed
+      showEditor: true, // doesn't matter
+      chartHeight: mergedSettings.height,
+      showSummary: mergedSettings.distributionPlotSettings.showSummary,
+      logX: mergedSettings.distributionPlotSettings.logX,
+      expY: mergedSettings.distributionPlotSettings.expY,
+      tickFormat:
+        mergedSettings.distributionPlotSettings.format || defaultTickFormat,
+      title: mergedSettings.distributionPlotSettings.title,
+      color: mergedSettings.distributionPlotSettings.color || defaultColor,
+      minX: mergedSettings.distributionPlotSettings.minX,
+      maxX: mergedSettings.distributionPlotSettings.maxX,
+      distributionChartActions: mergedSettings.distributionPlotSettings.actions,
+      diagramStart: mergedSettings.chartSettings.start,
+      diagramStop: mergedSettings.chartSettings.stop,
+      diagramCount: mergedSettings.chartSettings.count,
+    },
+  });
+  useEffect(() => {
+    const subscription = watch((vars) => {
+      const settings = getSettings(path); // get the latest version
+      setSettings(path, {
+        ...settings,
+        distributionPlotSettings: {
+          showSummary: vars.showSummary,
+          logX: vars.logX,
+          expY: vars.expY,
+          format: vars.tickFormat,
+          title: vars.title,
+          color: vars.color,
+          minX: vars.minX,
+          maxX: vars.maxX,
+          actions: vars.distributionChartActions,
+        },
+        chartSettings: {
+          start: vars.diagramStart,
+          stop: vars.diagramStop,
+          count: vars.diagramCount,
+        },
+      });
+      onChange();
+    });
+    return () => subscription.unsubscribe();
+  }, [getSettings, setSettings, onChange, path, watch]);
+
+  const { getLeftPanelElement } = useContext(PlaygroundContext);
+
+  return (
+    <Modal container={getLeftPanelElement()} close={close}>
+      <Modal.Header>
+        Chart settings
+        {path.length ? (
+          <>
+            {" for "}
+            <span
+              title="Scroll to item"
+              className="cursor-pointer"
+              onClick={resetScroll}
+            >
+              {pathAsString(path)}
+            </span>{" "}
+          </>
+        ) : (
+          ""
+        )}
+      </Modal.Header>
+      <Modal.Body>
+        <ViewSettings
+          register={register}
+          withShowEditorSetting={false}
+          withFunctionSettings={withFunctionSettings}
+          disableLogXSetting={disableLogX}
+        />
+      </Modal.Body>
+    </Modal>
+  );
+};
+
+export const ItemSettingsMenu: React.FC<Props> = (props) => {
+  const [isOpen, setIsOpen] = useState(false);
+  const { enableLocalSettings, setSettings, getSettings } =
+    useContext(ViewerContext);
+
+  const ref = useRef<HTMLDivElement | null>(null);
+
+  if (!enableLocalSettings) {
+    return null;
+  }
+  const settings = getSettings(props.path);
+
+  const resetScroll = () => {
+    if (!ref.current) return;
+    window.scroll({
+      top: ref.current.getBoundingClientRect().y + window.scrollY,
+      behavior: "smooth",
+    });
+  };
+
+  return (
+    <div className="flex gap-2" ref={ref}>
+      <CogIcon
+        className="h-5 w-5 cursor-pointer text-slate-400 hover:text-slate-500"
+        onClick={() => setIsOpen(!isOpen)}
+      />
+      {settings.distributionPlotSettings || settings.chartSettings ? (
+        <button
+          onClick={() => {
+            setSettings(props.path, {
+              ...settings,
+              distributionPlotSettings: undefined,
+              chartSettings: undefined,
+            });
+            props.onChange();
+          }}
+          className="text-xs px-1 py-0.5 rounded bg-slate-300"
+        >
+          Reset settings
+        </button>
+      ) : null}
+      {isOpen ? (
+        <ItemSettingsModal
+          {...props}
+          close={() => setIsOpen(false)}
+          resetScroll={resetScroll}
+        />
+      ) : null}
+    </div>
+  );
+};

packages/components/src/components/SquiggleViewer/VariableBox.tsx

@@ -0,0 +1,79 @@
+import React, { useContext, useReducer } from "react";
+import { Tooltip } from "../ui/Tooltip";
+import { LocalItemSettings, MergedItemSettings } from "./utils";
+import { ViewerContext } from "./ViewerContext";
+
+type SettingsMenuParams = {
+  onChange: () => void; // used to notify VariableBox that settings have changed, so that VariableBox could re-render itself
+};
+
+type VariableBoxProps = {
+  path: string[];
+  heading: string;
+  renderSettingsMenu?: (params: SettingsMenuParams) => React.ReactNode;
+  children: (settings: MergedItemSettings) => React.ReactNode;
+};
+
+export const VariableBox: React.FC<VariableBoxProps> = ({
+  path,
+  heading = "Error",
+  renderSettingsMenu,
+  children,
+}) => {
+  const { setSettings, getSettings, getMergedSettings } =
+    useContext(ViewerContext);
+
+  // Since ViewerContext doesn't keep the actual settings, VariableBox won't rerender when setSettings is called.
+  // So we use `forceUpdate` to force rerendering.
+  const [_, forceUpdate] = useReducer((x) => x + 1, 0);
+
+  const settings = getSettings(path);
+
+  const setSettingsAndUpdate = (newSettings: LocalItemSettings) => {
+    setSettings(path, newSettings);
+    forceUpdate();
+  };
+
+  const toggleCollapsed = () => {
+    setSettingsAndUpdate({ ...settings, collapsed: !settings.collapsed });
+  };
+
+  const isTopLevel = path.length === 0;
+  const name = isTopLevel ? "Result" : path[path.length - 1];
+
+  return (
+    <div>
+      <header className="inline-flex space-x-1">
+        <Tooltip text={heading}>
+          <span
+            className="text-slate-500 font-mono text-sm cursor-pointer"
+            onClick={toggleCollapsed}
+          >
+            {name}:
+          </span>
+        </Tooltip>
+        {settings.collapsed ? (
+          <span
+            className="rounded p-0.5 bg-slate-200 text-slate-500 font-mono text-xs cursor-pointer"
+            onClick={toggleCollapsed}
+          >
+            ...
+          </span>
+        ) : renderSettingsMenu ? (
+          renderSettingsMenu({ onChange: forceUpdate })
+        ) : null}
+      </header>
+      {settings.collapsed ? null : (
+        <div className="flex w-full">
+          {path.length ? (
+            <div
+              className="border-l-2 border-slate-200 hover:border-indigo-600 w-4 cursor-pointer"
+              onClick={toggleCollapsed}
+            ></div>
+          ) : null}
+          <div className="grow">{children(getMergedSettings(path))}</div>
+        </div>
+      )}
+    </div>
+  );
+};

packages/components/src/components/SquiggleViewer/ViewerContext.ts

@@ -0,0 +1,35 @@
+import { defaultEnvironment } from "@quri/squiggle-lang";
+import React from "react";
+import { LocalItemSettings, MergedItemSettings, Path } from "./utils";
+
+type ViewerContextShape = {
+  // Note that we don't store settings themselves in the context (that would cause rerenders of the entire tree on each settings update).
+  // Instead, we keep settings in local state and notify the global context via setSettings to pass them down the component tree again if it got rebuilt from scratch.
+  // See ./SquiggleViewer.tsx and ./VariableBox.tsx for other implementation details on this.
+  getSettings(path: Path): LocalItemSettings;
+  getMergedSettings(path: Path): MergedItemSettings;
+  setSettings(path: Path, value: LocalItemSettings): void;
+  enableLocalSettings: boolean; // show local settings icon in the UI
+};
+
+export const ViewerContext = React.createContext<ViewerContextShape>({
+  getSettings: () => ({ collapsed: false }),
+  getMergedSettings: () => ({
+    collapsed: false,
+    // copy-pasted from SquiggleChart
+    chartSettings: {
+      start: 0,
+      stop: 10,
+      count: 100,
+    },
+    distributionPlotSettings: {
+      showSummary: false,
+      logX: false,
+      expY: false,
+    },
+    environment: defaultEnvironment,
+    height: 150,
+  }),
+  setSettings() {},
+  enableLocalSettings: false,
+});

packages/components/src/components/SquiggleViewer/index.tsx

@@ -0,0 +1,100 @@
+import React, { useCallback, useRef } from "react";
+import { environment } from "@quri/squiggle-lang";
+import { DistributionPlottingSettings } from "../DistributionChart";
+import { FunctionChartSettings } from "../FunctionChart";
+import { ExpressionViewer } from "./ExpressionViewer";
+import { ViewerContext } from "./ViewerContext";
+import {
+  LocalItemSettings,
+  MergedItemSettings,
+  Path,
+  pathAsString,
+} from "./utils";
+import { useSquiggle } from "../../lib/hooks";
+import { SquiggleErrorAlert } from "../SquiggleErrorAlert";
+
+type Props = {
+  /** The output of squiggle's run */
+  result: ReturnType<typeof useSquiggle>;
+  width?: number;
+  height: number;
+  distributionPlotSettings: DistributionPlottingSettings;
+  /** Settings for displaying functions */
+  chartSettings: FunctionChartSettings;
+  /** Environment for further function executions */
+  environment: environment;
+  enableLocalSettings?: boolean;
+};
+
+type Settings = {
+  [k: string]: LocalItemSettings;
+};
+
+const defaultSettings: LocalItemSettings = { collapsed: false };
+
+export const SquiggleViewer: React.FC<Props> = ({
+  result,
+  width,
+  height,
+  distributionPlotSettings,
+  chartSettings,
+  environment,
+  enableLocalSettings = false,
+}) => {
+  // can't store settings in the state because we don't want to rerender the entire tree on every change
+  const settingsRef = useRef<Settings>({});
+
+  const getSettings = useCallback(
+    (path: Path) => {
+      return settingsRef.current[pathAsString(path)] || defaultSettings;
+    },
+    [settingsRef]
+  );
+
+  const setSettings = useCallback(
+    (path: Path, value: LocalItemSettings) => {
+      settingsRef.current[pathAsString(path)] = value;
+    },
+    [settingsRef]
+  );
+
+  const getMergedSettings = useCallback(
+    (path: Path) => {
+      const localSettings = getSettings(path);
+      const result: MergedItemSettings = {
+        distributionPlotSettings: {
+          ...distributionPlotSettings,
+          ...(localSettings.distributionPlotSettings || {}),
+        },
+        chartSettings: {
+          ...chartSettings,
+          ...(localSettings.chartSettings || {}),
+        },
+        environment: {
+          ...environment,
+          ...(localSettings.environment || {}),
+        },
+        height: localSettings.height || height,
+      };
+      return result;
+    },
+    [distributionPlotSettings, chartSettings, environment, height, getSettings]
+  );
+
+  return (
+    <ViewerContext.Provider
+      value={{
+        getSettings,
+        setSettings,
+        getMergedSettings,
+        enableLocalSettings,
+      }}
+    >
+      {result.tag === "Ok" ? (
+        <ExpressionViewer path={[]} expression={result.value} width={width} />
+      ) : (
+        <SquiggleErrorAlert error={result.value} />
+      )}
+    </ViewerContext.Provider>
+  );
+};

packages/components/src/components/SquiggleViewer/utils.ts

@@ -0,0 +1,22 @@
+import { DistributionPlottingSettings } from "../DistributionChart";
+import { FunctionChartSettings } from "../FunctionChart";
+import { environment } from "@quri/squiggle-lang";
+
+export type LocalItemSettings = {
+  collapsed: boolean;
+  distributionPlotSettings?: Partial<DistributionPlottingSettings>;
+  chartSettings?: Partial<FunctionChartSettings>;
+  height?: number;
+  environment?: Partial<environment>;
+};
+
+export type MergedItemSettings = {
+  distributionPlotSettings: DistributionPlottingSettings;
+  chartSettings: FunctionChartSettings;
+  height: number;
+  environment: environment;
+};
+
+export type Path = string[];
+
+export const pathAsString = (path: Path) => path.join(".");

packages/components/src/components/ViewSettings.tsx

@@ -0,0 +1,163 @@
+import React from "react";
+import * as yup from "yup";
+import { UseFormRegister } from "react-hook-form";
+import { InputItem } from "./ui/InputItem";
+import { Checkbox } from "./ui/Checkbox";
+import { HeadedSection } from "./ui/HeadedSection";
+import { Text } from "./ui/Text";
+import {
+  defaultColor,
+  defaultTickFormat,
+} from "../lib/distributionSpecBuilder";
+
+export const viewSettingsSchema = yup.object({}).shape({
+  chartHeight: yup.number().required().positive().integer().default(350),
+  showSummary: yup.boolean().required(),
+  showEditor: yup.boolean().required(),
+  logX: yup.boolean().required(),
+  expY: yup.boolean().required(),
+  tickFormat: yup.string().default(defaultTickFormat),
+  title: yup.string(),
+  color: yup.string().default(defaultColor).required(),
+  minX: yup.number(),
+  maxX: yup.number(),
+  distributionChartActions: yup.boolean(),
+  diagramStart: yup.number().required().positive().integer().default(0).min(0),
+  diagramStop: yup.number().required().positive().integer().default(10).min(0),
+  diagramCount: yup.number().required().positive().integer().default(20).min(2),
+});
+
+type FormFields = yup.InferType<typeof viewSettingsSchema>;
+
+// This component is used in two places: for global settings in SquigglePlayground, and for item-specific settings in modal dialogs.
+export const ViewSettings: React.FC<{
+  withShowEditorSetting?: boolean;
+  withFunctionSettings?: boolean;
+  disableLogXSetting?: boolean;
+  register: UseFormRegister<FormFields>;
+}> = ({
+  withShowEditorSetting = true,
+  withFunctionSettings = true,
+  disableLogXSetting,
+  register,
+}) => {
+  return (
+    <div className="space-y-6 p-3 divide-y divide-gray-200 max-w-xl">
+      <HeadedSection title="General Display Settings">
+        <div className="space-y-4">
+          {withShowEditorSetting ? (
+            <Checkbox
+              name="showEditor"
+              register={register}
+              label="Show code editor on left"
+            />
+          ) : null}
+          <InputItem
+            name="chartHeight"
+            type="number"
+            register={register}
+            label="Chart Height (in pixels)"
+          />
+        </div>
+      </HeadedSection>
+
+      <div className="pt-8">
+        <HeadedSection title="Distribution Display Settings">
+          <div className="space-y-2">
+            <Checkbox
+              register={register}
+              name="logX"
+              label="Show x scale logarithmically"
+              disabled={disableLogXSetting}
+              tooltip={
+                disableLogXSetting
+                  ? "Your distribution has mass lower than or equal to 0. Log only works on strictly positive values."
+                  : undefined
+              }
+            />
+            <Checkbox
+              register={register}
+              name="expY"
+              label="Show y scale exponentially"
+            />
+            <Checkbox
+              register={register}
+              name="distributionChartActions"
+              label="Show vega chart controls"
+            />
+            <Checkbox
+              register={register}
+              name="showSummary"
+              label="Show summary statistics"
+            />
+            <InputItem
+              name="minX"
+              type="number"
+              register={register}
+              label="Min X Value"
+            />
+            <InputItem
+              name="maxX"
+              type="number"
+              register={register}
+              label="Max X Value"
+            />
+            <InputItem
+              name="title"
+              type="text"
+              register={register}
+              label="Title"
+            />
+            <InputItem
+              name="tickFormat"
+              type="text"
+              register={register}
+              label="Tick Format"
+            />
+            <InputItem
+              name="color"
+              type="color"
+              register={register}
+              label="Color"
+            />
+          </div>
+        </HeadedSection>
+      </div>
+
+      {withFunctionSettings ? (
+        <div className="pt-8">
+          <HeadedSection title="Function Display Settings">
+            <div className="space-y-6">
+              <Text>
+                When displaying functions of single variables that return
+                numbers or distributions, we need to use defaults for the
+                x-axis. We need to select a minimum and maximum value of x to
+                sample, and a number n of the number of points to sample.
+              </Text>
+              <div className="space-y-4">
+                <InputItem
+                  type="number"
+                  name="diagramStart"
+                  register={register}
+                  label="Min X Value"
+                />
+                <InputItem
+                  type="number"
+                  name="diagramStop"
+                  register={register}
+                  label="Max X Value"
+                />
+                <InputItem
+                  type="number"
+                  name="diagramCount"
+                  register={register}
+                  label="Points between X min and X max to sample"
+                />
+              </div>
+            </div>
+          </HeadedSection>
+        </div>
+      ) : null}
+    </div>
+  );
+};

packages/components/src/components/ui/Checkbox.tsx

@@ -1,3 +1,4 @@
+import clsx from "clsx";
 import React from "react";
 import { Path, UseFormRegister } from "react-hook-form";
 
@@ -5,20 +6,32 @@ export function Checkbox<T>({
   name,
   label,
   register,
+  disabled,
+  tooltip,
 }: {
   name: Path<T>;
   label: string;
   register: UseFormRegister<T>;
+  disabled?: boolean;
+  tooltip?: string;
 }) {
   return (
-    <label className="flex items-center">
+    <label className="flex items-center" title={tooltip}>
       <input
         type="checkbox"
+        disabled={disabled}
         {...register(name)}
         className="form-checkbox focus:ring-indigo-500 h-4 w-4 text-indigo-600 border-gray-300 rounded"
       />
       {/* Clicking on the div makes the checkbox lose focus while mouse button is pressed, leading to annoying blinking; I couldn't figure out how to fix this. */}
-      <div className="ml-3 text-sm font-medium text-gray-700">{label}</div>
+      <div
+        className={clsx(
+          "ml-3 text-sm font-medium",
+          disabled ? "text-gray-400" : "text-gray-700"
+        )}
+      >
+        {label}
+      </div>
     </label>
   );
 }

packages/components/src/components/ui/HeadedSection.tsx

@@ -0,0 +1,13 @@
+import React from "react";
+
+export const HeadedSection: React.FC<{
+  title: string;
+  children: React.ReactNode;
+}> = ({ title, children }) => (
+  <div>
+    <header className="text-lg leading-6 font-medium text-gray-900">
+      {title}
+    </header>
+    <div className="mt-4">{children}</div>
+  </div>
+);

packages/components/src/components/ui/InputItem.tsx

@@ -0,0 +1,25 @@
+import React from "react";
+import { Path, UseFormRegister } from "react-hook-form";
+
+export function InputItem<T>({
+  name,
+  label,
+  type,
+  register,
+}: {
+  name: Path<T>;
+  label: string;
+  type: "number" | "text" | "color";
+  register: UseFormRegister<T>;
+}) {
+  return (
+    <label className="block">
+      <div className="text-sm font-medium text-gray-600 mb-1">{label}</div>
+      <input
+        type={type}
+        {...register(name, { valueAsNumber: type === "number" })}
+        className="form-input max-w-lg block w-full shadow-sm focus:ring-indigo-500 focus:border-indigo-500 sm:max-w-xs sm:text-sm border-gray-300 rounded-md"
+      />
+    </label>
+  );
+}

packages/components/src/components/ui/Modal.tsx

@@ -0,0 +1,184 @@
+import { motion } from "framer-motion";
+import React, { useContext } from "react";
+import * as ReactDOM from "react-dom";
+import { XIcon } from "@heroicons/react/solid";
+import clsx from "clsx";
+import { useWindowScroll, useWindowSize } from "react-use";
+
+type ModalContextShape = {
+  close: () => void;
+};
+const ModalContext = React.createContext<ModalContextShape>({
+  close: () => undefined,
+});
+
+const Overlay: React.FC = () => {
+  const { close } = useContext(ModalContext);
+  return (
+    <motion.div
+      className="absolute inset-0 -z-10 bg-black"
+      initial={{ opacity: 0 }}
+      animate={{ opacity: 0.1 }}
+      onClick={close}
+    />
+  );
+};
+
+const ModalHeader: React.FC<{
+  children: React.ReactNode;
+}> = ({ children }) => {
+  const { close } = useContext(ModalContext);
+  return (
+    <header className="px-5 py-3 border-b border-gray-200 font-bold flex items-center justify-between">
+      <div>{children}</div>
+      <button
+        className="px-1 bg-transparent cursor-pointer text-gray-700 hover:text-accent-500"
+        type="button"
+        onClick={close}
+      >
+        <XIcon className="h-5 w-5 cursor-pointer text-slate-400 hover:text-slate-500" />
+      </button>
+    </header>
+  );
+};
+
+// TODO - get rid of forwardRef, support `focus` and `{...hotkeys}` via smart props
+const ModalBody = React.forwardRef<
+  HTMLDivElement,
+  JSX.IntrinsicElements["div"]
+>(function ModalBody(props, ref) {
+  return <div ref={ref} className="px-5 py-3 overflow-auto" {...props} />;
+});
+
+const ModalFooter: React.FC<{ children: React.ReactNode }> = ({ children }) => (
+  <div className="px-5 py-3 border-t border-gray-200">{children}</div>
+);
+
+const ModalWindow: React.FC<{
+  children: React.ReactNode;
+  container?: HTMLElement;
+}> = ({ children, container }) => {
+  // This component works in two possible modes:
+  // 1. container mode - the modal is rendered inside a container element
+  // 2. centered mode - the modal is rendered in the middle of the screen
+  // The mode is determined by the presence of the `container` prop and by whether the available space is large enough to fit the modal.
+
+  // Necessary for container mode - need to reposition the modal on scroll and resize events.
+  useWindowSize();
+  useWindowScroll();
+
+  let position:
+    | {
+        left: number;
+        top: number;
+        maxWidth: number;
+        maxHeight: number;
+        transform: string;
+      }
+    | undefined;
+
+  // If available space in `visibleRect` is smaller than these, fallback to positioning in the middle of the screen.
+  const minWidth = 384;
+  const minHeight = 300;
+  const offset = 8;
+  const naturalWidth = 576; // maximum possible width; modal tries to take this much space, but can be smaller
+
+  if (container) {
+    const { clientWidth: screenWidth, clientHeight: screenHeight } =
+      document.documentElement;
+    const rect = container?.getBoundingClientRect();
+
+    const visibleRect = {
+      left: Math.max(rect.left, 0),
+      right: Math.min(rect.right, screenWidth),
+      top: Math.max(rect.top, 0),
+      bottom: Math.min(rect.bottom, screenHeight),
+    };
+    const maxWidth = visibleRect.right - visibleRect.left - 2 * offset;
+    const maxHeight = visibleRect.bottom - visibleRect.top - 2 * offset;
+
+    const center = {
+      left: visibleRect.left + (visibleRect.right - visibleRect.left) / 2,
+      top: visibleRect.top + (visibleRect.bottom - visibleRect.top) / 2,
+    };
+    position = {
+      left: center.left,
+      top: center.top,
+      transform: "translate(-50%, -50%)",
+      maxWidth,
+      maxHeight,
+    };
+    if (maxWidth < minWidth || maxHeight < minHeight) {
+      position = undefined; // modal is hard to fit in the container, fallback to positioning it in the middle of the screen
+    }
+  }
+  return (
+    <div
+      className={clsx(
+        "bg-white rounded-md shadow-toast flex flex-col overflow-auto border",
+        position ? "fixed" : null
+      )}
+      style={{
+        width: naturalWidth,
+        ...(position ?? {
+          maxHeight: "calc(100% - 20px)",
+          maxWidth: "calc(100% - 20px)",
+          width: naturalWidth,
+        }),
+      }}
+    >
+      {children}
+    </div>
+  );
+};
+
+type ModalType = React.FC<{
+  children: React.ReactNode;
+  container?: HTMLElement; // if specified, modal will be positioned over the visible part of the container, if it's not too small
+  close: () => void;
+}> & {
+  Body: typeof ModalBody;
+  Footer: typeof ModalFooter;
+  Header: typeof ModalHeader;
+};
+
+export const Modal: ModalType = ({ children, container, close }) => {
+  const [el] = React.useState(() => document.createElement("div"));
+
+  React.useEffect(() => {
+    document.body.appendChild(el);
+    return () => {
+      document.body.removeChild(el);
+    };
+  }, [el]);
+
+  React.useEffect(() => {
+    const handleEscape = (e: KeyboardEvent) => {
+      if (e.key === "Escape") {
+        close();
+      }
+    };
+    document.addEventListener("keydown", handleEscape);
+
+    return () => {
+      document.removeEventListener("keydown", handleEscape);
+    };
+  }, [close]);
+
+  const modal = (
+    <ModalContext.Provider value={{ close }}>
+      <div className="squiggle">
+        <div className="fixed inset-0 z-40 flex justify-center items-center">
+          <Overlay />
+          <ModalWindow container={container}>{children}</ModalWindow>
+        </div>
+      </div>
+    </ModalContext.Provider>
+  );
+
+  return ReactDOM.createPortal(modal, container || el);
+};
+
+Modal.Body = ModalBody;
+Modal.Footer = ModalFooter;
+Modal.Header = ModalHeader;

packages/components/src/components/ui/Text.tsx

@@ -0,0 +1,5 @@
+import React from "react";
+
+export const Text: React.FC<{ children: React.ReactNode }> = ({ children }) => (
+  <p className="text-sm text-gray-500">{children}</p>
+);

packages/components/src/components/ui/Tooltip.tsx

@@ -0,0 +1,64 @@
+import React, { cloneElement, useState } from "react";
+import { AnimatePresence, motion } from "framer-motion";
+import {
+  flip,
+  shift,
+  useDismiss,
+  useFloating,
+  useHover,
+  useInteractions,
+  useRole,
+} from "@floating-ui/react-dom-interactions";
+
+interface Props {
+  text: string;
+  children: JSX.Element;
+}
+
+export const Tooltip: React.FC<Props> = ({ text, children }) => {
+  const [isOpen, setIsOpen] = useState(false);
+
+  const { x, y, reference, floating, strategy, context } = useFloating({
+    placement: "top",
+    open: isOpen,
+    onOpenChange: setIsOpen,
+    middleware: [shift(), flip()],
+  });
+
+  const { getReferenceProps, getFloatingProps } = useInteractions([
+    useHover(context),
+    useRole(context, { role: "tooltip" }),
+    useDismiss(context),
+  ]);
+
+  return (
+    <>
+      {cloneElement(
+        children,
+        getReferenceProps({ ref: reference, ...children.props })
+      )}
+      <AnimatePresence>
+        {isOpen && (
+          <motion.div
+            initial={{ opacity: 0 }}
+            animate={{ opacity: 1 }}
+            exit={{ opacity: 0 }}
+            transition={{ duration: 0.15 }}
+            {...getFloatingProps({
+              ref: floating,
+              className:
+                "text-xs p-2 border border-gray-300 rounded bg-white z-10",
+              style: {
+                position: strategy,
+                top: y ?? 0,
+                left: x ?? 0,
+              },
+            })}
+          >
+            <div className="font-mono whitespace-pre">{text}</div>
+          </motion.div>
+        )}
+      </AnimatePresence>
+    </>
+  );
+};

packages/components/src/lib/distributionSpecBuilder.ts

@@ -100,12 +100,15 @@ export let expYScale: PowScale = {
   },
 };
 
+export const defaultTickFormat = ".9~s";
+export const defaultColor = "#739ECC";
+
 export function buildVegaSpec(
   specOptions: DistributionChartSpecOptions
 ): VisualizationSpec {
   let {
-    format = ".9~s",
+    format = defaultTickFormat,
-    color = "#739ECC",
+    color = defaultColor,
     title,
     minX,
     maxX,

packages/components/src/lib/distributionUtils.ts

@@ -0,0 +1,5 @@
+import { shape } from "@quri/squiggle-lang";
+
+export const hasMassBelowZero = (shape: shape) =>
+  shape.continuous.some((x) => x.x <= 0) ||
+  shape.discrete.some((x) => x.x <= 0);

packages/vscode-ext/media/previewWebview.js

@@ -9,8 +9,6 @@
       React.createElement(squiggle_components.SquigglePlayground, {
         code: text,
         showEditor: false,
-        showTypes: Boolean(showSettings.showTypes),
-        showControls: Boolean(showSettings.showControls),
         showSummary: Boolean(showSettings.showSummary),
       })
     );

packages/vscode-ext/package.json

@@ -105,16 +105,6 @@
     "configuration": {
       "title": "Squiggle",
       "properties": {
-        "squiggle.playground.showTypes": {
-          "type": "boolean",
-          "default": false,
-          "description": "Whether to show the types of outputs in the playground"
-        },
-        "squiggle.playground.showControls": {
-          "type": "boolean",
-          "default": false,
-          "description": "Whether to show the log scale controls in the playground"
-        },
         "squiggle.playground.showSummary": {
           "type": "boolean",
           "default": false,

packages/website/docusaurus.config.js

@@ -54,6 +54,7 @@ const config = {
     ({
       navbar: {
         title: "Squiggle",
+        hideOnScroll: true,
         logo: {
           alt: "Squiggle Logo",
           src: "img/quri-logo.png",

packages/website/src/pages/playground.js

@@ -44,12 +44,11 @@ export default function PlaygroundPage() {
   const playgroundProps = {
     defaultCode: "normal(0,1)",
     height: 700,
-    showTypes: true,
     ...hashData,
     onCodeChange: (code) => setHashData({ initialSquiggleString: code }),
     onSettingsChange: (settings) => {
-      const { showTypes, showControls, showSummary, showEditor } = settings;
+      const { showSummary, showEditor } = settings;
-      setHashData({ showTypes, showControls, showSummary, showEditor });
+      setHashData({ showSummary, showEditor });
     },
   };
   return (

yarn.lock

@@ -2190,6 +2190,35 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
+"@floating-ui/core@^0.7.3":
+  version "0.7.3"
+  resolved "https://registry.yarnpkg.com/@floating-ui/core/-/core-0.7.3.tgz#d274116678ffae87f6b60e90f88cc4083eefab86"
+  integrity sha512-buc8BXHmG9l82+OQXOFU3Kr2XQx9ys01U/Q9HMIrZ300iLc8HLMgh7dcCqgYzAzf4BkoQvDcXf5Y+CuEZ5JBYg==
+
+"@floating-ui/dom@^0.5.3":
+  version "0.5.4"
+  resolved "https://registry.yarnpkg.com/@floating-ui/dom/-/dom-0.5.4.tgz#4eae73f78bcd4bd553ae2ade30e6f1f9c73fe3f1"
+  integrity sha512-419BMceRLq0RrmTSDxn8hf9R3VCJv2K9PUfugh5JyEFmdjzDo+e8U5EdR8nzKq8Yj1htzLm3b6eQEEam3/rrtg==
+  dependencies:
+    "@floating-ui/core" "^0.7.3"
+
+"@floating-ui/react-dom-interactions@^0.6.6":
+  version "0.6.6"
+  resolved "https://registry.yarnpkg.com/@floating-ui/react-dom-interactions/-/react-dom-interactions-0.6.6.tgz#8542e8c4bcbee2cd0d512de676c6a493e0a2d168"
+  integrity sha512-qnao6UPjSZNHnXrF+u4/n92qVroQkx0Umlhy3Avk1oIebm/5ee6yvDm4xbHob0OjY7ya8WmUnV3rQlPwX3Atwg==
+  dependencies:
+    "@floating-ui/react-dom" "^0.7.2"
+    aria-hidden "^1.1.3"
+    use-isomorphic-layout-effect "^1.1.1"
+
+"@floating-ui/react-dom@^0.7.2":
+  version "0.7.2"
+  resolved "https://registry.yarnpkg.com/@floating-ui/react-dom/-/react-dom-0.7.2.tgz#0bf4ceccb777a140fc535c87eb5d6241c8e89864"
+  integrity sha512-1T0sJcpHgX/u4I1OzIEhlcrvkUN8ln39nz7fMoE/2HDHrPiMFoOGR7++GYyfUmIQHkkrTinaeQsO3XWubjSvGg==
+  dependencies:
+    "@floating-ui/dom" "^0.5.3"
+    use-isomorphic-layout-effect "^1.1.1"
+
 "@gar/promisify@^1.0.1":
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/@gar/promisify/-/promisify-1.1.3.tgz#555193ab2e3bb3b6adc3d551c9c030d9e860daf6"
@@ -5748,6 +5777,13 @@ argv@0.0.2:
   resolved "https://registry.yarnpkg.com/argv/-/argv-0.0.2.tgz#ecbd16f8949b157183711b1bda334f37840185ab"
   integrity sha512-dEamhpPEwRUBpLNHeuCm/v+g0anFByHahxodVO/BbAarHVBBg2MccCwf9K+o1Pof+2btdnkJelYVUWjW/VrATw==
 
+aria-hidden@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/aria-hidden/-/aria-hidden-1.1.3.tgz#bb48de18dc84787a3c6eee113709c473c64ec254"
+  integrity sha512-RhVWFtKH5BiGMycI72q2RAFMLQi8JP9bLuQXgR5a8Znp7P5KOIADSJeyfI8PCVxLEp067B2HbP5JIiI/PXIZeA==
+  dependencies:
+    tslib "^1.0.0"
+
 aria-query@^4.2.2:
   version "4.2.2"
   resolved "https://registry.yarnpkg.com/aria-query/-/aria-query-4.2.2.tgz#0d2ca6c9aceb56b8977e9fed6aed7e15bbd2f83b"
@@ -17418,7 +17454,7 @@ tsconfig-paths@^3.14.1, tsconfig-paths@^3.9.0:
     minimist "^1.2.6"
     strip-bom "^3.0.0"
 
-tslib@^1.8.1:
+tslib@^1.0.0, tslib@^1.8.1:
   version "1.14.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
   integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==