Add support for Bezier curves of arbitrary degree.

New functions:

bezier = love.math.newBezierCurve(control-points)
degree = bezier:getDegree() -- degree = #control-points - 1
x,y = bezier:getControlPoint(pos) -- pos < 0 => string.sub semantics
bezier:setControlPoint(pos, x, y) -- pos < 0 => string.sub semantics
bezier:insertControlPoint(x,y, [pos = -1])
x,y = bezier:eval(t) -- 0 <= t <= 1
polyline = bezier:render([accuracy = 5]) -- returns a table of points

Example:

function love.load()
	b = love.math.newBezierCurve(10,10, 80,400, 380,400, 470,10)
end

function love.draw()
	if not curve then -- curve rendering is expensive-ish
		curve = b:render()
	end
	love.graphics.line(curve)
end

src/modules/math/MathModule.h

@@ -26,6 +26,7 @@
 // LOVE
 #include "common/Module.h"
 #include "common/math.h"
+#include "common/Vector.h"
 #include "common/int.h"
 
 // Noise
@@ -39,6 +40,8 @@ namespace love
 namespace math
 {
 
+class BezierCurve;
+
 class Math : public Module
 {
 private:
@@ -95,6 +98,11 @@ public:
 	 **/
 	RandomGenerator *newRandomGenerator();
 
+	/**
+	 * Creates a new bezier curve.
+	 **/
+	BezierCurve *newBezierCurve(const std::vector<Vector> &points);
+
 	virtual const char *getName() const
 	{
 		return "love.math";