Factor code to rotate a canvas about a point.
SkMatrix::scale and ::rotate take a point around which to scale or rotate.
Canvas lacks these helpers, so the code to rotate a canvas around a
point has been duplicated many times. Factor all of these
implementations into SkCanvas::rotate.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2142033002
Review-Url: https://codereview.chromium.org/2142033002
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index ffa507b..7afaa96 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1372,9 +1372,7 @@
if (fRotate) {
SkScalar cx = this->width() / 2;
SkScalar cy = this->height() / 2;
- canvas->translate(cx, cy);
- canvas->rotate(gAnimTimer.scaled(10));
- canvas->translate(-cx, -cy);
+ canvas->rotate(gAnimTimer.scaled(10), cx, cy);
}
if (fPerspAnim) {