Replace cairo curve flattener from Anitgrain Graphics

This also fixes an issue where non-closed curves were not dilated
properly.

1 files changed, 27 insertions, 0 deletions

diff --git a/svg-flatten/include/flatten.hpp b/svg-flatten/include/flatten.hpp
new file mode 100644
index 0000000..b620890
--- /dev/null
+++ b/svg-flatten/include/flatten.hpp
@@ -0,0 +1,27 @@
+
+#include "gerbolyze.hpp"
+
+namespace gerbolyze {
+    class curve4_div {
+        public:
+            curve4_div(double distance_tolerance=0.1, double angle_tolerance=0.0, double cusp_limit=0.0)
+                : m_distance_tolerance_square(0.25*distance_tolerance*distance_tolerance),
+                m_angle_tolerance(angle_tolerance),
+                m_cusp_limit(cusp_limit)
+                {
+                }
+
+            void run(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4);
+            const std::vector<d2p> &points() { return m_points; }
+
+        private:
+            void recursive_bezier(double x1, double y1, double x2, double y2, 
+                                  double x3, double y3, double x4, double y4,
+                                  unsigned level);
+            double m_cusp_limit;
+            double m_distance_tolerance_square;
+            double m_angle_tolerance;
+            std::vector<d2p> m_points;
+    };
+}
+