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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1671 | chris | 1 | package com.gebauz.bauzoid.math.collision; |
| 2 | |||
| 3 | import java.util.Vector; |
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| 4 | |||
| 5 | import com.gebauz.bauzoid.game.Game; |
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| 6 | import com.gebauz.bauzoid.game.GameObject; |
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| 7 | import com.gebauz.bauzoid.graphics.Graphics; |
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| 8 | import com.gebauz.bauzoid.graphics.sprite.SpriteTransform; |
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| 9 | import com.gebauz.bauzoid.math.Vector2; |
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| 10 | |||
| 11 | /** Collection of shape elements that form a complex shape. */ |
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| 12 | public class Shape extends GameObject |
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| 13 | { |
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| 14 | |||
| 15 | // Constants======================================================================================== |
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| 16 | |||
| 17 | // Embedded Types=================================================================================== |
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| 18 | |||
| 19 | // Fields=========================================================================================== |
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| 20 | |||
| 21 | private Vector<BaseShapeElement> mShapes = new Vector<BaseShapeElement>(); |
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| 22 | |||
| 23 | private String mShapeFile = null; |
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| 24 | private boolean mIsAsync = false; |
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| 25 | |||
| 26 | public SpriteTransform transform = new SpriteTransform(); |
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| 27 | |||
| 28 | private PolyElement mConvexHull = null; |
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| 29 | |||
| 30 | private AABoundingBox mBoundingBox = null; |
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| 31 | private AABoundingBox mTransformedBoundingBox = null; |
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| 32 | |||
| 33 | private int mCurrentFrame = -1; |
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| 34 | |||
| 35 | //private Vector2 mTemp = new Vector2(); |
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| 36 | |||
| 37 | // Methods========================================================================================== |
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| 38 | |||
| 39 | public Shape(Game game, String shapeFile) |
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| 40 | { |
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| 41 | super(game); |
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| 42 | mShapeFile = shapeFile; |
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| 43 | } |
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| 44 | |||
| 45 | /** Clone a shape and its shape elements to new shape. */ |
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| 46 | public Shape(Shape clone) |
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| 47 | { |
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| 48 | super(clone.getGame()); |
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| 49 | |||
| 50 | for (int i = 0; i < clone.getShapeElementCount(); i++) |
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| 51 | { |
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| 52 | mShapes.add(clone.getShapeElement(i).copy(this)); |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | public void initAsync() |
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| 57 | { |
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| 58 | mIsAsync = true; |
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| 59 | |||
| 60 | if (mShapeFile != null) |
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| 61 | { |
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| 62 | getAssetManager().load(mShapeFile, ShapeData.class, new ShapeDataAsyncLoader.ShapeDataParameter(this)); |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | public void init() |
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| 67 | { |
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| 68 | if (mShapeFile != null) |
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| 69 | { |
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| 70 | ShapeData shapeData = null; |
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| 71 | if (!mIsAsync) |
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| 72 | { |
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| 73 | shapeData = ShapeUtil.createShapeFromFile(this, mShapeFile); |
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| 74 | } |
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| 75 | else |
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| 76 | { |
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| 77 | shapeData = getAssetManager().get(mShapeFile, ShapeData.class); |
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| 78 | } |
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| 79 | |||
| 80 | for (int i = 0; i < shapeData.getShapeElementCount(); i++) |
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| 81 | { |
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| 82 | mShapes.add(shapeData.getShapeElement(i).copy(this)); |
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| 83 | } |
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| 84 | } |
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| 85 | |||
| 86 | calculateConvexHull(); |
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| 87 | } |
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| 88 | |||
| 89 | /** Calculate the untransformed convex hull and the axis aligned bounding box of the shape element group. */ |
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| 90 | public void calculateConvexHull() |
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| 91 | { |
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| 92 | Vector<Vector2> pointCloud = new Vector<Vector2>(); |
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| 93 | Vector<Vector2> hull = new Vector<Vector2>(); |
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| 94 | |||
| 95 | for (int i = 0; i < getShapeElementCount(); i++) |
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| 96 | { |
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| 97 | BaseShapeElement e = getShapeElement(i); |
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| 98 | |||
| 99 | Vector2[] pt = e.getUntransformedPoints(); |
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| 100 | |||
| 101 | for (int j = 0; j < pt.length; j++) |
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| 102 | { |
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| 103 | pointCloud.add(pt[j]); |
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| 104 | } |
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| 105 | } |
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| 106 | |||
| 107 | // find leftmost point |
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| 108 | int leftMostIndex = 0; |
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| 109 | for (int i = 1; i < pointCloud.size(); i++) |
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| 110 | { |
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| 111 | if (pointCloud.get(i).x < pointCloud.get(leftMostIndex).x) |
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| 112 | leftMostIndex = i; |
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| 113 | } |
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| 114 | |||
| 115 | // start from leftmost point |
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| 116 | int p = leftMostIndex; |
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| 117 | int q; |
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| 118 | do |
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| 119 | { |
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| 120 | // search for point q such that orientation(p, i, q) is counterclockwise for all points i |
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| 121 | q = (p + 1) % pointCloud.size(); |
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| 122 | for (int i = 0; i < pointCloud.size(); i++) |
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| 123 | { |
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| 124 | if (orientation(pointCloud.get(p), pointCloud.get(i), pointCloud.get(q)) == 2) |
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| 125 | q = i; |
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| 126 | } |
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| 127 | |||
| 128 | hull.add(pointCloud.get(q).copy()); |
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| 129 | p = q; // set p as q for next iteration |
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| 130 | } |
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| 131 | while (p != leftMostIndex); |
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| 132 | |||
| 133 | mBoundingBox = new AABoundingBox(hull); |
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| 134 | |||
| 135 | mTransformedBoundingBox = mBoundingBox.createFromTransformed(transform); |
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| 136 | |||
| 137 | mConvexHull = new PolyElement(this, hull); |
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| 138 | } |
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| 139 | |||
| 140 | /** To find orientation of ordered triplet (p, q, r). |
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| 141 | * The function returns following values |
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| 142 | * 0 --> p, q and r are colinear |
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| 143 | * 1 --> Clockwise |
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| 144 | * 2 --> Counterclockwise |
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| 145 | */ |
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| 146 | private static int orientation(final Vector2 p, final Vector2 q, final Vector2 r) |
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| 147 | { |
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| 148 | final float x1 = (q.x - p.x) * (r.y - p.y); |
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| 149 | final float x2 = (r.x - p.x) * (q.y - p.y); |
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| 150 | final float val = x1 - x2; |
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| 151 | |||
| 152 | if (val == 0) return 0; |
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| 153 | |||
| 154 | return (val > 0) ? 1 : 2; |
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| 155 | } |
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| 156 | |||
| 157 | /** Render debug output. */ |
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| 158 | public void renderDebug(Graphics graphics, SpriteTransform t) |
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| 159 | { |
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| 160 | for (int i = 0; i < getShapeElementCount(); i++) |
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| 161 | { |
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| 162 | getShapeElement(i).renderDebug(graphics, t); |
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| 163 | } |
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| 164 | |||
| 165 | //mConvexHull.renderDebug(graphics, t); |
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| 166 | } |
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| 167 | |||
| 168 | public void addElement(BaseShapeElement shapeElement) |
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| 169 | { |
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| 170 | mShapes.add(shapeElement); |
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| 171 | } |
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| 172 | |||
| 173 | |||
| 174 | public boolean intersectsCircleSqr(float x, float y, float radiusSqr) |
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| 175 | { |
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| 176 | for (int i = 0; i < getShapeElementCount(); i++) |
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| 177 | { |
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| 178 | if (getShapeElement(i).intersectsCircleSqr(x, y, radiusSqr)) |
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| 179 | return true; |
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| 180 | } |
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| 181 | |||
| 182 | return false; |
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| 183 | } |
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| 184 | |||
| 185 | // Getters/Setters================================================================================== |
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| 186 | |||
| 187 | public final BaseShapeElement getShapeElement(int i) |
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| 188 | { |
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| 189 | return mShapes.get(i); |
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| 190 | } |
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| 191 | |||
| 192 | public final int getShapeElementCount() |
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| 193 | { |
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| 194 | return mShapes.size(); |
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| 195 | } |
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| 196 | |||
| 197 | public final PolyElement getConvexHull() |
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| 198 | { |
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| 199 | return mConvexHull; |
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| 200 | } |
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| 201 | |||
| 202 | public final AABoundingBox getBoundingBox() |
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| 203 | { |
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| 204 | return mBoundingBox; |
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| 205 | } |
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| 206 | |||
| 207 | public final AABoundingBox getTransformedBoundingBox() |
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| 208 | { |
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| 209 | mBoundingBox.transform(transform, mTransformedBoundingBox); |
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| 210 | |||
| 211 | return mTransformedBoundingBox; |
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| 212 | } |
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| 213 | |||
| 214 | public final void setCurrentFrame(int frame) { mCurrentFrame = frame; } |
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| 215 | public final int getCurrentFrame() { return mCurrentFrame; } |
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| 216 | |||
| 217 | |||
| 218 | |||
| 219 | } |