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Handle tiny handles correctly In Curve's evaluate()

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If the curve handles are almost zero, reset the control points to the anchors.

Closes #838
This commit is contained in:
Jürg Lehni 2016-01-06 15:03:35 +01:00
parent b9c76f44e8
commit 8cec4f972d
1 changed files with 14 additions and 10 deletions
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24
src/path/Curve.js
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@ -708,12 +708,6 @@ statics: {
: v;
},
hasHandles: function(v) {
var isZero = Numerical.isZero;
return !(isZero(v[0] - v[2]) && isZero(v[1] - v[3])
&& isZero(v[4] - v[6]) && isZero(v[5] - v[7]));
},
isFlatEnough: function(v, tolerance) {
// Thanks to Kaspar Fischer and Roger Willcocks for the following:
// http://hcklbrrfnn.files.wordpress.com/2012/08/bez.pdf
@ -1221,13 +1215,23 @@ new function() { // Scope for methods that require private functions
p2x = v[6], p2y = v[7],
tMin = /*#=*/Numerical.CURVETIME_EPSILON,
tMax = 1 - tMin,
isZero = Numerical.isZero,
x, y;
// If the curve handles are almost zero, reset the control points to the
// anchors.
if (isZero(c1x - p1x) && isZero(c1y - p1y)) {
c1x = p1x;
c1y = p1y;
}
if (isZero(c2x - p2x) && isZero(c2y - p2y)) {
c2x = p2x;
c2y = p2y;
}
// Handle special case at beginning / end of curve
if (type === 0 && (t < tMin || t > tMax)) {
var isZero = t < tMin;
x = isZero ? p1x : p2x;
y = isZero ? p1y : p2y;
var zero = t < tMin;
x = zero ? p1x : p2x;
y = zero ? p1y : p2y;
} else {
// Calculate the polynomial coefficients.
var cx = 3 * (c1x - p1x),