nuclear@14: #include <algorithm>
nuclear@14: #include "revol.h"
nuclear@14: 
nuclear@14: Vector2 bezier_revol(float u, float v, void *cls)
nuclear@14: {
nuclear@14: 	BezCurve *curve = (BezCurve*)cls;
nuclear@14: 	int nseg = (curve->numcp - 1) / 2;
nuclear@14: 
nuclear@14: 	if(v >= 1.0) v = 1.0 - 1e-6;
nuclear@14: 	int cidx = std::min((int)(v * nseg), nseg - 1);
nuclear@14: 	float t = fmod(v * (float)nseg, 1.0);
nuclear@14: 
nuclear@14: 	const vec2_t *cp = curve->cp + cidx * 2;
nuclear@14: 
nuclear@14: 	float resx = bezier(cp[0].x, cp[1].x, cp[1].x, cp[2].x, t);
nuclear@14: 	float resy = bezier(cp[0].y, cp[1].y, cp[1].y, cp[2].y, t);
nuclear@14: 	return Vector2(resx * curve->scale, resy * curve->scale);
nuclear@14: }
nuclear@14: 
nuclear@14: Vector2 bezier_revol_normal(float u, float v, void *cls)
nuclear@14: {
nuclear@14: 	BezCurve *curve = (BezCurve*)cls;
nuclear@14: 	int nseg = (curve->numcp - 1) / 2;
nuclear@14: 
nuclear@14: 	if(v >= 1.0) v = 1.0 - 1e-6;
nuclear@14: 	int cidx = std::min((int)(v * nseg), nseg - 1);
nuclear@14: 	float t = fmod(v * (float)nseg, 1.0);
nuclear@14: 
nuclear@14: 	const vec2_t *cp = curve->cp + cidx * 2;
nuclear@14: 	Vector2 cp0 = cp[0];
nuclear@14: 	Vector2 cp1 = cp[1];
nuclear@14: 	Vector2 cp2 = cp[2];
nuclear@14: 
nuclear@14: 	Vector2 pprev, pnext;
nuclear@14: 	for(int i=0; i<2; i++) {
nuclear@14: 		pprev[i] = bezier(cp0[i], cp1[i], cp1[i], cp2[i], t - 0.05);
nuclear@14: 		pnext[i] = bezier(cp0[i], cp1[i], cp1[i], cp2[i], t + 0.05);
nuclear@14: 	}
nuclear@14: 
nuclear@14: 	float tx = pnext.x - pprev.x;
nuclear@14: 	float ty = pnext.y - pprev.y;
nuclear@14: 
nuclear@14: 	return Vector2(-ty, tx);
nuclear@14: }