Made Bezier code slightly more easy to read

src/DrawingCallback.cc

@@ -95,24 +95,27 @@ void DrawingCallback::line_to(Vector2d to)
 	pen = to;
 }
 
+// Quadric Bezier curve
 void DrawingCallback::curve_to(Vector2d c1, Vector2d to)
 {
 	for (unsigned long idx = 1;idx <= fn;idx++) {
 		const double a = idx * (1.0 / (double)fn);
-		const double x = pen[0] * t(a, 2) + c1[0] * 2 * t(a, 1) * a + to[0] * a * a;
-		const double y = pen[1] * t(a, 2) + c1[1] * 2 * t(a, 1) * a + to[1] * a * a;
-		add_vertex(Vector2d(x, y));
+		add_vertex(pen * pow(1-a, 2) + 
+							 c1 * 2 * pow(1-a, 1) * a + 
+							 to * pow(a, 2));
 	}
 	pen = to;
 }
 
+// Cubic Bezier curve
 void DrawingCallback::curve_to(Vector2d c1, Vector2d c2, Vector2d to)
 {
 	for (unsigned long idx = 1;idx <= fn;idx++) {
 		const double a = idx * (1.0 / (double)fn);
-		const double x = pen[0] * t(a, 3) + c1[0] * 3 * t(a, 2) * a + c2[0] * 3 * t(a, 1) * a * a + to[0] * a * a * a;
-		const double y = pen[1] * t(a, 3) + c1[1] * 3 * t(a, 2) * a + c2[1] * 3 * t(a, 1) * a * a + to[1] * a * a * a;
-		add_vertex(Vector2d(x, y));
+		add_vertex(pen * pow(1-a, 3) + 
+							 c1 * 3 * pow(1-a, 2) * a + 
+							 c2 * 3 * pow(1-a, 1) * pow(a, 2) + 
+							 to * pow(a, 3));
 	}
 	pen = to;
 }

src/DrawingCallback.h

@@ -56,8 +56,4 @@ class DrawingCallback {
 	std::vector<const class Geometry *> polygons;
 
     void add_vertex(Vector2d v);
-
-    inline double t(double t, int exp) const {
-	return pow(1.0 - t, exp);
-    }
 };