samples/guiAndGfx: eC port of JFD's Mekano

[sdk] / samples / guiAndGfx / mekano / mekanopolygon.ec

diff --git a/samples/guiAndGfx/mekano/mekanopolygon.ec b/samples/guiAndGfx/mekano/mekanopolygon.ec
new file mode 100644 (file)
index 0000000..5e29487
--- /dev/null
+++ b/samples/guiAndGfx/mekano/mekanopolygon.ec
@@ -0,0 +1,56 @@
+import "mekanoobjectpolygonal"
+
+class MekanoPolygon
+{
+   List<MekanoPoint> m_Points { };
+
+public:
+   property MekanoObjectPolygonal polygonal { set { value.addPolygon(this); } }
+
+   property List<MekanoPoint> points { get { return m_Points; } }
+
+   void addPoint(MekanoPoint point)
+   {
+      m_Points.Add(point);
+   }
+
+   bool ::crosses(Vector2D c, Vector2D p1, Vector2D p2)
+   {
+      if(c.y>Min(p1.y, p2.y) && c.y<Max(p1.y, p2.y) && c.x <= Max(p1.x, p2.x))
+      {
+         float xinters=(c.y-p1.y)*(p2.x-p1.x)/(p2.y-p1.y)+p1.x;
+         return (p1.x==p2.x || c.x<xinters);
+      }
+      return false;
+   }
+
+   bool isInside(Vector2D v)
+   {
+      if(m_Points.count > 1)
+      {
+         int c = 0;
+         MekanoPoint point1, point2 = null, firstpoint = null;
+         bool first = true;
+
+         for(p : m_Points)
+         {
+            if(first)
+            {
+               firstpoint = point2 = p;
+               first = false;
+            }
+            else
+            {
+               point1 = point2;
+               point2 = p;
+               if(crosses(v, point1.localPosition, point2.localPosition))
+                  c++;
+            }
+         }
+         if(crosses(v, point2.localPosition, firstpoint.localPosition))
+            c++;
+         return c & 1;
+      }
+      return false;
+   }
+}