2 files changed, 14 insertions, 0 deletions
diff --git a/include/cru/platform/graphics/Geometry.h b/include/cru/platform/graphics/Geometry.h
index b4b05194..6550a8ce 100644
--- a/include/cru/platform/graphics/Geometry.h
+++ b/include/cru/platform/graphics/Geometry.h
@@ -63,6 +63,18 @@ struct CRU_PLATFORM_GRAPHICS_API IGeometry : virtual IGraphicsResource {
  * virtual so it can override them.
  */
 struct CRU_PLATFORM_GRAPHICS_API IGeometryBuilder : virtual IGraphicsResource {
+  struct ArcInfo {
+    Point center;
+    // In radian.
+    float start_angle;
+    // In radian.
+    float end_angle;
+  };
+
+  static ArcInfo CalculateArcInfo(const Point& start_point, const Point& radius,
+                          float angle, bool is_large_arc, bool is_clockwise,
+                          const Point& end_point);
+
   virtual Point GetCurrentPosition() = 0;
 
   virtual void MoveTo(const Point& point) = 0;
diff --git a/include/cru/platform/graphics/quartz/Geometry.h b/include/cru/platform/graphics/quartz/Geometry.h
index 18e2e25e..14d06deb 100644
--- a/include/cru/platform/graphics/quartz/Geometry.h
+++ b/include/cru/platform/graphics/quartz/Geometry.h
@@ -47,6 +47,8 @@ class QuartzGeometryBuilder : public OsxQuartzResource,
                      const Point &end_point) override;
   void QuadraticBezierTo(const Point &control_point,
                          const Point &end_point) override;
+  void ArcTo(const Point &radius, float angle, bool is_large_arc,
+             bool is_clockwise, const Point &end_point) override;
   void CloseFigure(bool close) override;
 
   std::unique_ptr<IGeometry> Build() override;