带阵列的Box2d碰撞检测
[英]Box2d Collision Detection with Arrays
问题描述
I'm developing in AndEngine I have nearly completed my game, but unfortunately, it suffers from a low fps occasionally due to the fact that I am checking .collideswith a lot in my update loop. 
我正在AndEngine中进行开发，我已经快完成游戏了，但是不幸的是，由于我在更新循环中经常检查.collides的事实，偶尔会出现帧速低的问题。 I now understand that this is the problem, and I have been trying to change it using Box2d with bodies and such as in theory, this is exactly what I need, but I can't get a grasp around it! 我现在知道这是问题所在，我一直在尝试使用Box2d结合身体进行更改，例如从理论上讲，这正是我所需要的，但是我无法理解它！
Basically, I have 4 arrays; 基本上，我有4个数组； one for cars, three for enemies. 一台用于汽车，三台用于敌人。 Cars drive from left to right, and if they make contact with any of these enemies, it's speed changes depending. 汽车从左到右行驶，如果它们与这些敌人中的任何一个接触，则速度会有所变化。 Do I have to allocate a body to each one of cars and enemies when I am loading their arrays? 加载数组时，是否必须为每辆汽车和敌人分配一个车身？ And then how do I check? 然后如何检查？ do I run a for loop, and then an 'isBodyContacted(carBody, iceBergBody);' 我运行for循环，然后运行“ isBodyContacted（carBody，iceBergBody）;” in the update look? 在更新外观？ It's a bit cofusing! 有点令人困惑！
For reference, loading my car: 供参考，装载我的车：
private void loadCar() {
for (int i = 0; i < rManager.getInstance().carArray.length; i++) {
rManager.getInstance().carArray[i] = new Car(new Sprite(
rManager.getInstance().spawnPoint[i].getSpawnPos().x,
rManager.getInstance().spawnPoint[i].getSpawnPos().y,
rManager.getInstance().car_region,
engine.getVertexBufferObjectManager()) {
@Override
public boolean onAreaTouched(final TouchEvent pSceneTouchEvent,
final float pTouchAreaLocalX,
final float pTouchAreaLocalY) {
if (pSceneTouchEvent.isActionMove()
&& GameManager.getInstance().getDebugMode() == true) {
this.setPosition(pSceneTouchEvent.getX(),
pSceneTouchEvent.getY());
}
return true;
}
});
}
for (int i = 0; i < rManager.getInstance().carArray.length; i++) {
rManager.getInstance().carArray[i].getCarSprite().setScale(0.5f);
rManager.getInstance().carArray[i].getCarSprite().setAnchorCenter(
0, 0);
colourX = (randNumber(2, 9));
colourY = (randNumber(2, 9));
colourZ = (randNumber(2, 9));
colourX /= 10;
colourY /= 10;
colourZ /= 10;
rManager.getInstance().carArray[i].getCarSprite().setColor(colourZ,
colourY, colourZ);
attachChild(rManager.getInstance().carArray[i].getCarSprite());
this.registerTouchArea(rManager.getInstance().carArray[i]
.getCarSprite());
this.setTouchAreaBindingOnActionDownEnabled(true);
}
}
Loading an enemy.. 装载敌人
void loadIceBerg() {
for (int i = 0; i < rManager.getInstance().iceBergArray.length; i++) {
rManager.getInstance().iceBergArray[i] = new IceBergEnemy(
new Sprite(randNumber(200, 700), randNumber(0, 480),
rManager.getInstance().iceBerg_region,
engine.getVertexBufferObjectManager()) {
@Override
public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
this.setPosition(pSceneTouchEvent.getX(), pSceneTouchEvent.getY());
if (this.getY() > rManager.getInstance().camera.getHeight() - (this.getHeight() / 2) || this.getY() < 0 + (this.getHeight() / 2))
{
this.setPosition(200 - (pDifficultyLevel * 20),
-100);
showScore(50, " ice berg!");
this.setVisible(false);
}
if(pSceneTouchEvent.isActionUp())
{
updateScore(50);
GameManager.getInstance().updateTotalIceBergEnemiesKilled();
}
return true;
}
});
rManager.getInstance().iceBergArray[i].getIceBergSprite()
.setPosition(
rManager.getInstance().iceBergArray[i]
.getIceBergSprite().getX(),
rManager.getInstance().iceBergArray[i]
.getIceBergSprite().getY());
rManager.getInstance().iceBergArray[i].getIceBergSprite().setScale(
0.8f);
this.registerTouchArea(rManager.getInstance().iceBergArray[i]
.getIceBergSprite());
this.setTouchAreaBindingOnActionDownEnabled(true);
attachChild(rManager.getInstance().iceBergArray[i]
.getIceBergSprite());
}
}
Some collision! 一些碰撞！
else if (rManager.getInstance().iceBergArray[2]
.getIceBergSprite().collidesWith(
rManager.getInstance().carArray[r]
.getCarSprite())) {
rManager.getInstance().carArray[r].setCarSpeed(0f);
}
else if (rManager.getInstance().iceBergArray[3]
.getIceBergSprite().collidesWith(
rManager.getInstance().carArray[r]
.getCarSprite())) {
rManager.getInstance().carArray[r].setCarSpeed(0f);
}
else if (rManager.getInstance().iceBergArray[4]
.getIceBergSprite().collidesWith(
rManager.getInstance().carArray[r]
.getCarSprite())) {
rManager.getInstance().carArray[r].setCarSpeed(0f);
}
else if (rManager.getInstance().iceBergArray[5]
.getIceBergSprite().collidesWith(
rManager.getInstance().carArray[r]
.getCarSprite())) {
rManager.getInstance().carArray[r].setCarSpeed(0f);
}
I have found many tutorials, but none seem to reference an array of objects, and that is exactly what I need. 我找到了很多教程，但似乎都没有引用对象数组，而这正是我所需要的。 If someone could help me or provide some sort of quick tutorial, then that would be greatly appreciated. 如果有人可以帮助我或提供某种快速教程，那么将不胜感激。 Thanks!! 谢谢！！
1 个解决方案
解决方案1
0 2013-05-20 03:27:41
You should not use any loops to check each possible combination of collision. 您不应使用任何循环来检查每种可能的碰撞组合。 Instead, you should register a listener for the whole World and set user data on your bodies (eg type = "car", "enemy"). 相反，您应该为整个世界注册一个侦听器，并在您的身体上设置用户数据（例如，type =“ car”，“ enemy”）。 Then in the listener, you just check which two objects collided. 然后在侦听器中，您只需检查两个对象发生了碰撞。 Check out this example: 看看这个例子：
http://www.andengine.org/forums/gles2/collision-events-t7140.html#p31300 http://www.andengine.org/forums/gles2/collision-events-t7140.html#p31300
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