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Prevent NaN results when previous, point, and next are all the same

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Evert Timberg 2015-11-14 22:49:08 -05:00
parent 3bd9120a3a
commit 55c7d6872a
1 changed files with 16 additions and 14 deletions
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30
src/core/core.helpers.js
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@ -321,27 +321,29 @@
aliasPixel = helpers.aliasPixel = function(pixelWidth) {
return (pixelWidth % 2 === 0) ? 0 : 0.5;
},
splineCurve = helpers.splineCurve = function(FirstPoint, MiddlePoint, AfterPoint, t) {
splineCurve = helpers.splineCurve = function(firstPoint, middlePoint, afterPoint, t) {
//Props to Rob Spencer at scaled innovation for his post on splining between points
//http://scaledinnovation.com/analytics/splines/aboutSplines.html
// This function must also respect "skipped" points
var previous = FirstPoint,
current = MiddlePoint,
next = AfterPoint;
var previous = firstPoint.skip ? middlePoint : firstPoint,
current = middlePoint,
next = afterPoint.skip ? middlePoint : afterPoint;
if (previous.skip) {
previous = current;
}
if (next.skip) {
next = current;
}
var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));
var s01 = d01 / (d01 + d12);
var s12 = d12 / (d01 + d12);
// If all points are the same, s01 & s02 will be inf
s01 = isNaN(s01) ? 0 : s01;
s12 = isNaN(s12) ? 0 : s12;
var fa = t * s01; // scaling factor for triangle Ta
var fb = t * s12;
var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2)),
d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2)),
fa = t * d01 / (d01 + d12), // scaling factor for triangle Ta
fb = t * d12 / (d01 + d12);
return {
previous: {
x: current.x - fa * (next.x - previous.x),