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set label of edge at the angle of this edge.

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moreover, if two vertices have more than 1 edge allow each edge to have its own label. make sure each labels does not interfere each other.
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oak-tree 2014-01-08 21:04:52 +02:00
parent 8be075d656
commit 4acb7e9fb7
1 changed files with 13 additions and 2 deletions
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15
springyui.js
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@ -166,7 +166,8 @@ jQuery.fn.springy = function(params) {
}
}
var spacing = 6.0;
//change default to 10.0 to allow text fit between edges
var spacing = 10.0; //was 6.0 before
// Figure out how far off center the line should be drawn
var offset = normal.multiply(-((total - 1) * spacing)/2.0 + (n * spacing));
@ -234,7 +235,11 @@ jQuery.fn.springy = function(params) {
ctx.textBaseline = "top";
ctx.font = "10px Helvetica, sans-serif";
ctx.fillStyle = "#5BA6EC";
ctx.fillText(text, (x1+x2)/2, (y1+y2)/2);
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.fillText(text, 0,-2);
ctx.restore();
}
@ -274,6 +279,12 @@ 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));