[65] | 1 | package pl.vorg.mowa.core.graphics;
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| 2 |
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| 3 | /**
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| 4 | * A vector in 2d space.
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| 5 | *
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| 6 | * @author vorg
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| 7 | */
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| 8 | public class Vec2 {
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| 9 | private float[] v = {0,0};
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| 10 |
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| 11 | public Vec2() {
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| 12 |
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| 13 | }
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| 14 |
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| 15 | public Vec2(float x, float y) {
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| 16 | v[0] = x;
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| 17 | v[1] = y;
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| 18 | }
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| 19 |
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| 20 | public Vec2(Vec2 vec) {
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| 21 | float[] w = vec.getVector();
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| 22 | v[0] = w[0];
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| 23 | v[1] = w[1];
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| 24 | }
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| 25 |
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| 26 | public Vec2(float[] vec) {
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| 27 | v[0] = vec[0];
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| 28 | v[1] = vec[1];
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| 29 | }
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| 30 |
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| 31 | @Override
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| 32 | public boolean equals(java.lang.Object obj) {
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| 33 | float[] w = ((Vec2)obj).getVector();
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| 34 | return (v[0] == w[0]) && (v[1] == w[1]);
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| 35 | }
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| 36 |
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| 37 | public float getX() {
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| 38 | return v[0];
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| 39 | }
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| 40 |
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| 41 | public float getY() {
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| 42 | return v[1];
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| 43 | }
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| 44 |
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| 45 | public float getS() {
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| 46 | return v[0];
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| 47 | }
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| 48 |
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| 49 | public float getT() {
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| 50 | return v[1];
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| 51 | }
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| 52 |
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| 53 | public void setX(float x) {
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| 54 | v[0] = x;
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| 55 | }
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| 56 |
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| 57 | public void setY(float y) {
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| 58 | v[1] = y;
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| 59 | }
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| 60 |
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| 61 | public void setS(float s) {
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| 62 | v[0] = s;
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| 63 | }
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| 64 |
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| 65 | public void setT(float t) {
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| 66 | v[1] = t;
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| 67 | }
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| 68 |
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| 69 | public float[] getVector() {
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| 70 | return v;
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| 71 | }
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| 72 |
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| 73 | public void normalize() {
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| 74 | float length = length();
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| 75 | if (length > 0) {
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| 76 | v[0] /= length;
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| 77 | v[1] /= length;
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | public float length() {
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| 82 | return (float)Math.sqrt(v[0]*v[0]+v[1]*v[1]);
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| 83 | }
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| 84 |
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| 85 | public float dot(Vec2 a) {
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| 86 | float[] va = a.getVector();
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| 87 | return v[0]*va[0] + v[1]*va[1];
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| 88 | }
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| 89 |
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| 90 | public float angle(Vec2 a) {
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| 91 | float len = length();
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| 92 | float alen = a.length();
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| 93 | if ((len == 0) || (alen == 0)) {
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| 94 | return 0;
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| 95 | }
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| 96 | return (float)Math.acos(this.dot(a)/(len*alen));
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| 97 | }
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| 98 |
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| 99 | public static float angle(Vec2 a, Vec2 b) {
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| 100 | return a.angle(b);
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| 101 | }
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| 102 |
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| 103 | public static float angleTan(Vec2 a, Vec2 b) {
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| 104 | double angle = Math.atan2(a.getY(),a.getX()) - Math.atan2(b.getY(),b.getX());
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| 105 | return (float)angle;
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| 106 | }
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| 107 | }
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