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