HALF WORK!geo-arc

3 files changed, 24 insertions, 0 deletions

diff --git a/include/cru/platform/GraphicsBase.h b/include/cru/platform/GraphicsBase.h
index b0f653ef..d9057beb 100644
--- a/include/cru/platform/GraphicsBase.h
+++ b/include/cru/platform/GraphicsBase.h
@@ -5,6 +5,7 @@
 #include "cru/base/Range.h"
 #include "cru/base/String.h"
 
+#include <cmath>
 #include <format>
 #include <limits>
 
@@ -24,6 +25,11 @@ struct Point final {
 
   constexpr Point Negate() const { return Point(-x, -y); }
 
+  static constexpr float Distance(const Point& p1, const Point& p2) {
+    auto dx = p1.x - p2.x, dy = p1.y - p2.y;
+    return std::sqrt(dx * dx + dy * dy);
+  }
+
   float x = 0;
   float y = 0;
 };
@@ -36,6 +42,10 @@ constexpr Point operator-(const Point& left, const Point& right) {
   return Point(left.x - right.x, left.y - right.y);
 }
 
+constexpr Point operator/(const Point& point, float scale) {
+  return Point(point.x / scale, point.y / scale);
+}
+
 constexpr bool operator==(const Point& left, const Point& right) {
   return left.x == right.x && left.y == right.y;
 }
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;