scratchfoundation/paper.js
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Use standard values for tMin / tMax when calling getTangentAt() tracePaths()

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This commit is contained in:
Jürg Lehni 2015-01-03 20:59:20 +01:00
parent 6bb6002d1a
commit 46d7717812
1 changed files with 5 additions and 5 deletions
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10
src/path/PathItem.Boolean.js
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@ -344,8 +344,8 @@ PathItem.inject(new function() {
var paths = [], var paths = [],
// Values for getTangentAt() that are almost 0 and 1. // Values for getTangentAt() that are almost 0 and 1.
// TODO: Correctly support getTangentAt(0) / (1)? // TODO: Correctly support getTangentAt(0) / (1)?
ZERO = 1e-3, tMin = /*#=*/Numerical.TOLERANCE,
ONE = 1 - 1e-3; tMax = 1 - tMin;
for (var i = 0, seg, startSeg, l = segments.length; i < l; i++) { for (var i = 0, seg, startSeg, l = segments.length; i < l; i++) {
seg = startSeg = segments[i]; seg = startSeg = segments[i];
if (seg._visited || !operator(seg._winding)) if (seg._visited || !operator(seg._winding))
@ -376,14 +376,14 @@ PathItem.inject(new function() {
var c1 = seg.getCurve(); var c1 = seg.getCurve();
if (dir > 0) if (dir > 0)
c1 = c1.getPrevious(); c1 = c1.getPrevious();
var t1 = c1.getTangentAt(dir < 1 ? ZERO : ONE, true), var t1 = c1.getTangentAt(dir < 1 ? tMin : tMax, true),
// Get both curves at the intersection (except the // Get both curves at the intersection (except the
// entry curves). // entry curves).
c4 = interSeg.getCurve(), c4 = interSeg.getCurve(),
c3 = c4.getPrevious(), c3 = c4.getPrevious(),
// Calculate their winding values and tangents. // Calculate their winding values and tangents.
t3 = c3.getTangentAt(ONE, true), t3 = c3.getTangentAt(tMax, true),
t4 = c4.getTangentAt(ZERO, true), t4 = c4.getTangentAt(tMin, true),
// Cross product of the entry and exit tangent // Cross product of the entry and exit tangent
// vectors at the intersection, will let us select // vectors at the intersection, will let us select
// the correct contour to traverse next. // the correct contour to traverse next.