diff options
| author |  bungeman <bungeman@google.com> | 2016-07-12 15:01:19 -0700 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2016-07-12 15:01:19 -0700 |
| commit | 7438bfc0804d021aa92cdd5ea644994a4248f3db (patch) | |
| tree | 0b801d131d01d45e83160a6d0d877949590908de /include/core | |
| parent | 2edf0c6a719b8dff4365628cf3b4481c5035f07a (diff) | |
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
Diffstat (limited to 'include/core')
| -rw-r--r-- | include/core/SkCanvas.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h index 337ce72767..bba045c490 100644 --- a/include/core/SkCanvas.h +++ b/include/core/SkCanvas.h @@ -419,11 +419,18 @@ public: */ void scale(SkScalar sx, SkScalar sy); - /** Preconcat the current matrix with the specified rotation. + /** Preconcat the current matrix with the specified rotation about the origin. @param degrees The amount to rotate, in degrees */ void rotate(SkScalar degrees); + /** Preconcat the current matrix with the specified rotation about a given point. + @param degrees The amount to rotate, in degrees + @param px The x coordinate of the point to rotate about. + @param py The y coordinate of the point to rotate about. + */ + void rotate(SkScalar degrees, SkScalar px, SkScalar py); + /** Preconcat the current matrix with the specified skew. @param sx The amount to skew in X @param sy The amount to skew in Y |