scratchfoundation/paper.js
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Improve a couple of comments.

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This commit is contained in:
Jürg Lehni 2016-01-08 01:09:15 +01:00
parent eba9601601
commit ba6c1201fe
1 changed files with 9 additions and 12 deletions
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21
src/path/PathItem.Boolean.js
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@ -310,16 +310,14 @@ PathItem.inject(new function() {
length = curves.length,
roots = [],
abs = Math.abs;
// Absolutely horizontal curves may return wrong results, since
// the curves are monotonic in y direction and this is an
// indeterminate state.
// Horizontal curves may return wrong results, since the curves are
// monotonic in y direction and this is an indeterminate state.
if (horizontal) {
var yTop = -Infinity,
yBottom = Infinity,
yBefore = py - epsilon,
yAfter = py + epsilon;
// Find the closest top and bottom intercepts for the same vertical
// line.
// Find the closest top and bottom intercepts for the vertical line.
for (var i = 0; i < length; i++) {
var values = curves[i].values,
count = Curve.solveCubic(values, 0, px, roots, 0, 1);
@ -332,8 +330,8 @@ PathItem.inject(new function() {
}
}
}
// Shift the point lying on the horizontal curves by
// half of closest top and bottom intercepts.
// Shift the point lying on the horizontal curves by half of the
// closest top and bottom intercepts.
yTop = (yTop + py) / 2;
yBottom = (yBottom + py) / 2;
if (yTop > -Infinity)
@ -423,11 +421,10 @@ PathItem.inject(new function() {
totalLength += length;
segment = segment.getNext();
} while (segment && !segment._intersection && segment !== start);
// Calculate the average winding among three evenly distributed
// points along this curve chain as a representative winding number.
// This selection gives a better chance of returning a correct
// winding than equally dividing the curve chain, with the same
// (amortised) time.
// Calculate the average winding among three evenly distributed points
// along this curve chain as a representative winding number. This
// selection gives a better chance of returning a correct winding than
// equally dividing the curve chain, with the same (amortized) time.
for (var i = 0; i < 3; i++) {
// Sample the points at 1/4, 2/4 and 3/4 of the total length:
var length = totalLength * (i + 1) / 4;