diff options
| author |  robertphillips@google.com <robertphillips@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-09-26 12:05:32 +0000 |
|---|---|---|
| committer | robertphillips@google.com <robertphillips@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-09-26 12:05:32 +0000 |
| commit | 6c000321f2b910b95734bc96d7613b1c2c795109 (patch) | |
| tree | f636c2a6b62282659f0b9cb7876df61d37a5a3a6 /gm/hairlines.cpp | |
| parent | 441433e9c47b445202a5e9c635aae67b1314cd2b (diff) | |
Add GM case for arc truncation error bug
https://codereview.chromium.org/23532082/
git-svn-id: http://skia.googlecode.com/svn/trunk@11466 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'gm/hairlines.cpp')
| -rw-r--r-- | gm/hairlines.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gm/hairlines.cpp b/gm/hairlines.cpp index d4d142fa7a..fb7258ea4a 100644 --- a/gm/hairlines.cpp +++ b/gm/hairlines.cpp @@ -133,6 +133,31 @@ protected: bug2->lineTo(5.5f, 0.5f); bug2->lineTo(0.5f, 0.5f); } + + { + // Arc example to test imperfect truncation bug (crbug.com/295626) + static const SkScalar kRad = SkIntToScalar(2000); + static const SkScalar kStartAngle = SkFloatToScalar(262.59717f); + static const SkScalar kSweepAngle = SkScalarHalf(SkFloatToScalar(17.188717f)); + + SkPath* bug = &fPaths.push_back(); + + // Add a circular arc + SkRect circle = SkRect::MakeLTRB(-kRad, -kRad, kRad, kRad); + bug->addArc(circle, kStartAngle, kSweepAngle); + + // Now add the chord that should cap the circular arc + SkScalar cosV, sinV = SkScalarSinCos(SkDegreesToRadians(kStartAngle), &cosV); + + SkPoint p0 = SkPoint::Make(kRad * cosV, kRad * sinV); + + sinV = SkScalarSinCos(SkDegreesToRadians(kStartAngle + kSweepAngle), &cosV); + + SkPoint p1 = SkPoint::Make(kRad * cosV, kRad * sinV); + + bug->moveTo(p0); + bug->lineTo(p1); + } } virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |