Add BezierCurve:getSegment(t1, t2)

Returns a BezierCurve that corresponds to the curve-segment between t1 and t2
on the original curve.

src/modules/math/wrap_BezierCurve.cpp

@@ -157,6 +157,20 @@ int w_BezierCurve_evaluate(lua_State *L)
 
 }
 
+int w_BezierCurve_getSegment(lua_State *L)
+{
+	BezierCurve *curve = luax_checkbeziercurve(L, 1);
+	double t1 = luaL_checknumber(L, 2);
+	double t2 = luaL_checknumber(L, 3);
+
+	BezierCurve *segment;
+	luax_catchexcept(L, [&](){ segment = curve->getSegment(t1, t2); });
+	luax_pushtype(L, MATH_BEZIER_CURVE_ID, segment);
+	segment->release();
+
+	return 1;
+}
+
 int w_BezierCurve_render(lua_State *L)
 {
 	BezierCurve *curve = luax_checkbeziercurve(L, 1);
@@ -212,6 +226,7 @@ static const luaL_Reg functions[] =
 	{"rotate", w_BezierCurve_rotate},
 	{"scale", w_BezierCurve_scale},
 	{"evaluate", w_BezierCurve_evaluate},
+	{"getSegment", w_BezierCurve_getSegment},
 	{"render", w_BezierCurve_render},
 	{"renderSegment", w_BezierCurve_renderSegment},
 	{ 0, 0 }