public MyLayer() {
WYSize s = Director.getInstance().getWindowSize();
Chipmunk chipmunk = Chipmunk.make();
chipmunk.setDebugDraw(true);
chipmunk.setPosition(s.width / 2, s.height / 2);
addChild(chipmunk);
mRandom = new Random();
Shape.resetShapeIdCounter();
mSpace = chipmunk.getSpace();
mSpace.setIterations(5);
mSpace.setGravity(0, -100);
mSpace.resizeActiveHash(40f, 999);
mSpace.resizeStaticHash(30f, 2999);
Body staticBody = Body.make(Float.MAX_VALUE, Float.MAX_VALUE);
// Create vertexes for a pentagon shape.
WYPoint[] verts = new WYPoint[5];
for (int i = 0; i < NUM_VERTS; i++) {
float angle = -2 * (float) Math.PI * i / (NUM_VERTS);
verts[i] = WYPoint.make(10 * (float) cos(angle), 10 * (float) sin(angle));
}
// Vertexes for a triangle shape.
WYPoint tris[] = {WYPoint.make(-15, -15), WYPoint.make(0, 10), WYPoint.make(15, -15)};
// Create the static triangles.
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 6; j++) {
float stagger = (j % 2) * 40;
WYPoint offset = WYPoint.make(i * 80 - s.width / 2 + stagger, j * 70 - s.width / 2);
Poly shape = Poly.make(staticBody, tris, offset);
shape.setRestitution(1f);
shape.setFriction(1f);
shape.setLayerMask(Chipmunk.NOT_GRABABLE_MASK);
mSpace.addStaticShape(shape);
}
}
// Add lots of pentagons
float moment = Chipmunk.calculateMomentForPoly(1f, verts, WYPoint.makeZero());
for (int i = 0; i < 50; i++) {
Body body = Body.make(1f, moment);
float x = frand() * s.width - s.width / 2;
body.setPosition(x, s.height / 2 * 5 / 7);
mSpace.addBody(body);
Poly shape = Poly.make(body, verts, WYPoint.makeZero());
shape.setFriction(0.4f);
mSpace.addShape(shape);
}
schedule(new TargetSelector(this, "update(float)", new Object[] {0f}));
}
/** \if English Result of collision detection \else 碰撞检测的结果 \endif */
public class CDResult {
/** \if English collision point count \else 碰撞点个数 \endif */
public int pointCount = 0;
/**
* \if English collision points, max is two and they are in world coordinates \else 碰撞点数组,
* 最多两个且用的是全局坐标 \endif
*/
public WYPoint[] points = new WYPoint[] {WYPoint.makeZero(), WYPoint.makeZero()};
/**
* \if English normal of collision, in world coordinate. It points from first node to second node.
* \else 碰撞方向, 以全局坐标表示. 总是从第一个节点指向第二个节点. \endif
*/
public WYPoint normal = WYPoint.makeZero();
/** \if English reset result object to all zero \else 重置所有数据为0 \endif */
public void clear() {
pointCount = 0;
points[0].x = points[0].y = points[1].x = points[1].y = 0;
normal.x = normal.y = 0;
}
/**
* \if English Get float array of collision points
*
* @return float array of collision points \else 得到碰撞点的浮点数组表示形式
* @return 碰撞点的浮点数组 \endif
*/
public float[] getPoints() {
if (pointCount == 1) return new float[] {points[0].x, points[0].y};
else if (pointCount == 2)
return new float[] {points[0].x, points[0].y, points[1].x, points[1].y};
else return new float[0];
}
}
/**
* \if English Map a clip to external atlas texture
*
* @param fromClipIndex source clip index
* @param tex external texture \else 映射一个分片到外部的图片集上
* @param fromClipIndex 被映射的分片索引
* @param tex 图片集的贴图对象 \endif
*/
public void mapClip(int fromClipIndex, Texture2D tex) {
mapClip(fromClipIndex, tex, WYPoint.makeZero());
}
/** Get the global gravity vector. */
public WYPoint getGravity() {
WYPoint p = WYPoint.makeZero();
nativeGetGravity(p);
return p;
}
/**
* \if English get pin point
*
* @return global coordinate of pin point \else 得到pin point
* @return pin point的全局坐标 \endif
*/
public WYPoint getPinPoint() {
WYPoint p = WYPoint.makeZero();
nativeGetPinPoint(p);
return p;
}