AS3:如何检测碰撞?
问题描述:
我试图做一个简单的游戏,当球落入某个块时,你赢了。AS3:如何检测碰撞?
机制:球通过几个障碍物落下,最后有两个方块,如果球碰到你赢的左方块,下一个关卡将包含更多的块和更少的空间。
测试影片(点击屏幕上砸球): http://gabrielmeono.com/downloads/Lucky_Hit_Alpha.swf
这些是主要的变量:
var winBox:QuickObject;//You win
var looseBox:QuickObject;//You loose
var gameBall:QuickObject;//Ball dropped
问:
- 如何检测交流电如果球击中winBox,ollision并发挥作用? (赢消息/下一等级)*
谢谢你,这里是全码:
package {
import flash.display.MovieClip;
import com.actionsnippet.qbox.*;
import flash.events.MouseEvent;
[SWF(width = 600, height = 600, frameRate = 60)]
public class LuckyHit extends MovieClip {
public var sim:QuickBox2D;
var winBox:QuickObject;
var looseBox:QuickObject;
var gameBall:QuickObject;
/**
* Constructor
*/
public function LuckyHit()
{
sim = new QuickBox2D(this);
//sim.createStageWalls();
winBox = sim.addBox({x:5,y:600/30, width:300/30, height:10/30, density:0});
looseBox = sim.addBox({x:15,y:600/30, width:300/30, height:10/30, density:0});
// make obstacles
for (var i:int = 0; i<(stage.stageWidth/50); i++){
//End
sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0});
sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0});
//Mid End
sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0});
//Middle Start
sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0});
sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0});
sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0});
sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0});
}
sim.start();
stage.addEventListener(MouseEvent.CLICK, _clicked);
}
/**
* ..
* @param e MouseEvent.CLICK
*/
private function _clicked(e:MouseEvent)
{
gameBall = sim.addCircle({x:(mouseX/30), y:(1), radius:0.25, density:5});
}
}
}
答
编辑:添加第二个参数gameBall。
我对QuickBox2D并不熟悉,但请注意这一点。
var simContacts:QuickContacts;
public function LuckyHit()
{
...
simContacts = sim.addContactListener();
simContacts.addEventListener(QuickContacts.ADD, contactListener);
}
...
private function contactListener(event:Event)
{
if (simContacts.isCurrentContact(winBox, gameBall))
{
// They won.
}
}
在QuickBox2D documentation相关类是QuickContacts。
答
如果两个对象的边界框重叠并且两个对象的边界圆重叠,则圆和矩形会发生碰撞。
但是就像加布里埃尔说的那样,除非你真的想了解它背后的机制,否则你会更好地使用一些现有的库,而不是写自己的库。
答
Flixel是开始制作游戏的好库,碰撞检测是一项核心功能。
除非这是不允许外部库的类分配?
除非我误读,因为我不熟悉box2d,所以应该使用[hitTestObject](http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/DisplayObject.html#hitTestObject ()),当它返回true时,调用你想要的任何函数。 – ToddBFisher 2011-12-15 18:51:10