如何在java中进行碰撞检测
我正在尝试在java中为cocos2d for android进行共谋检测，这是我的代码
float oldx = player.getPosition().x;
float oldy = player.getPosition().y;
if((player.getPosition().y + player.getContentSize().height > building1.getPosition().y) &&
(player.getPosition().y < building1.getPosition().y + building1.getContentSize().height) &&
(player.getPosition().x + player.getContentSize().width > building1.getPosition().x) &&
(player.getPosition().x < building1.getPosition().x + building1.getContentSize().width))
{
player.setPosition(CGPoint.ccp(oldx, oldy));
}
，但由于某种原因它不起作用......为什么？
I'm trying to go collusion detection in java for cocos2d for android and heres the code I have
float oldx = player.getPosition().x;
float oldy = player.getPosition().y;
if((player.getPosition().y + player.getContentSize().height > building1.getPosition().y) &&
(player.getPosition().y < building1.getPosition().y + building1.getContentSize().height) &&
(player.getPosition().x + player.getContentSize().width > building1.getPosition().x) &&
(player.getPosition().x < building1.getPosition().x + building1.getContentSize().width))
{
player.setPosition(CGPoint.ccp(oldx, oldy));
}
but for some reason it doesn't work... why?
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您将
oldx和oldy设置为player.getPosition().x和player.getPosition().y， 分别。您在碰撞检测 if 语句中使用完全相同的检查，因此您基本上将位置设置为原来的位置。在检查碰撞发生之前，您需要知道玩家想要移动到的位置，然后不允许玩家移动到那里（即不更新他们的 X 和 Y）。
You are setting
oldxandoldytoplayer.getPosition().xandplayer.getPosition().y, respectively. You are using exactly the same checks in your collision detection if-statement so you are essentially setting the position to the same spot it was.You need to know the position the player wants to move to prior to doing the check that the collision occurs, and then just not allow the player to move there (i.e. don't update their X and Y).