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Use epsilons when deciding for horizontal winding and dealing with horizontal mono-curves.

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Relates to #890#issuecomment-169672571, fixing the 2nd case of the 2nd example.
This commit is contained in:
Jürg Lehni 2016-01-07 15:58:51 +01:00
parent bc8fb92b9d
commit 36a98706b3
1 changed files with 5 additions and 2 deletions
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7
src/path/PathItem.Boolean.js
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@ -434,7 +434,7 @@ PathItem.inject(new function() {
// changes between before and after the curve, we treat
// this as a 'touch point'.
if (prevWinding && nextWinding
&& py === values[1]
&& abs(py - values[1]) < epsilon
&& (values[0] < xAfter && values[6] > xBefore
|| values[6] < xAfter && values[0] > xBefore)
&& prevWinding.winding * nextWinding.winding < 0) {
@ -937,7 +937,10 @@ Path.inject(/** @lends Path# */{
function insertCurve(v) {
var y0 = v[1],
y1 = v[7],
winding = y0 === y1
// Look at the slope of the line between the mono-curve's anchor
// points with some tolerance to decide if it is horizontal.
winding = Math.abs((y0 - y1) / (v[0] - v[6]))
< /*#=*/Numerical.GEOMETRIC_EPSILON
? 0 // Horizontal
: y0 > y1
? -1 // Decreasing