tavli: src/revol.cc annotate

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annotate src/revol.cc @ 18:986c0b76513f

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 29 Jun 2015 01:29:36 +0300
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rev	line source
nuclear@14	1 #include <algorithm>
nuclear@14	2 #include "revol.h"
nuclear@14	3
nuclear@14	4 Vector2 bezier_revol(float u, float v, void *cls)
nuclear@14	5 {
nuclear@14	6 BezCurve curve = (BezCurve)cls;
nuclear@14	7 int nseg = (curve->numcp - 1) / 2;
nuclear@14	8
nuclear@14	9 if(v >= 1.0) v = 1.0 - 1e-6;
nuclear@14	10 int cidx = std::min((int)(v * nseg), nseg - 1);
nuclear@14	11 float t = fmod(v * (float)nseg, 1.0);
nuclear@14	12
nuclear@14	13 const vec2_t cp = curve->cp + cidx 2;
nuclear@14	14
nuclear@14	15 float resx = bezier(cp[0].x, cp[1].x, cp[1].x, cp[2].x, t);
nuclear@14	16 float resy = bezier(cp[0].y, cp[1].y, cp[1].y, cp[2].y, t);
nuclear@14	17 return Vector2(resx * curve->scale, resy * curve->scale);
nuclear@14	18 }
nuclear@14	19
nuclear@14	20 Vector2 bezier_revol_normal(float u, float v, void *cls)
nuclear@14	21 {
nuclear@14	22 BezCurve curve = (BezCurve)cls;
nuclear@14	23 int nseg = (curve->numcp - 1) / 2;
nuclear@14	24
nuclear@14	25 if(v >= 1.0) v = 1.0 - 1e-6;
nuclear@14	26 int cidx = std::min((int)(v * nseg), nseg - 1);
nuclear@14	27 float t = fmod(v * (float)nseg, 1.0);
nuclear@14	28
nuclear@14	29 const vec2_t cp = curve->cp + cidx 2;
nuclear@14	30 Vector2 cp0 = cp[0];
nuclear@14	31 Vector2 cp1 = cp[1];
nuclear@14	32 Vector2 cp2 = cp[2];
nuclear@14	33
nuclear@14	34 Vector2 pprev, pnext;
nuclear@14	35 for(int i=0; i<2; i++) {
nuclear@14	36 pprev[i] = bezier(cp0[i], cp1[i], cp1[i], cp2[i], t - 0.05);
nuclear@14	37 pnext[i] = bezier(cp0[i], cp1[i], cp1[i], cp2[i], t + 0.05);
nuclear@14	38 }
nuclear@14	39
nuclear@14	40 float tx = pnext.x - pprev.x;
nuclear@14	41 float ty = pnext.y - pprev.y;
nuclear@14	42
nuclear@14	43 return Vector2(-ty, tx);
nuclear@14	44 }