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Improved calculation of text angle and spacing

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This commit is contained in:
Dennis Hotson 2014-01-11 05:17:41 +11:00
parent 36c885871e
commit 00cbc7f64e
1 changed files with 5 additions and 12 deletions
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17
springyui.js
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@ -168,7 +168,7 @@ jQuery.fn.springy = function(params) {
}
//change default to 10.0 to allow text fit between edges
var spacing = 10.0; //was 6.0 before
var spacing = 12.0;
// Figure out how far off center the line should be drawn
var offset = normal.multiply(-((total - 1) * spacing)/2.0 + (n * spacing));
@ -235,11 +235,10 @@ jQuery.fn.springy = function(params) {
ctx.textAlign = "center";
ctx.textBaseline = "top";
ctx.font = (edge.data.font !== undefined) ? edge.data.font : edgeFont;
ctx.fillStyle = "#5BA6EC";
var xText = (s1.x+s2.x)/2;
var yText = (s1.y+s2.y)/2;
ctx.translate(xText, yText);
ctx.rotate(getTextAngle(s1.x,s1.y,s2.x,s2.y));
ctx.fillStyle = stroke;
var textPos = s1.add(s2).divide(2).add(normal.multiply(-8));
ctx.translate(textPos.x, textPos.y);
ctx.rotate(Math.atan2(s2.y - s1.y, s2.x - s1.x));
ctx.fillText(text, 0,-2);
ctx.restore();
}
@ -280,12 +279,6 @@ jQuery.fn.springy = function(params) {
renderer.start();
// return angle of text in radian
function getTextAngle(x1, y1, x2, y2){
var tan = (y2-y1)/(x2-x1);
return Math.atan(tan);
}
// helpers for figuring out where to draw arrows
function intersect_line_line(p1, p2, p3, p4) {
var denom = ((p4.y - p3.y)*(p2.x - p1.x) - (p4.x - p3.x)*(p2.y - p1.y));