Question

背景：

尝试做一个简单的“丢球”游戏。

代码位于时间轴的第一帧内。没有更多的东西在舞台上。

问题：

使用QuickBox2D我创建了一个简单的If语句，它可以删除和对象的鼠标x位置：

if (MouseEvent.CLICK) {
sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});

我导入了MouseEvent库：

import flash.events.MouseEvent;

如果我点击，没有任何输出错误也没有发生。

查看实际操作： http://gabrielmeono.com/download/Lucky_Hit_Alpha.swf http://gabrielmeono.com/download/Lucky_Hit_Alpha.fla

完整代码：

    [SWF(width = 350, height = 600, frameRate = 60)]  
import com.actionsnippet.qbox.*;  
import flash.events.MouseEvent;

var sim:QuickBox2D = new QuickBox2D(this);  
sim.createStageWalls();
//var ball:sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); //

// make a heavy circle 

sim.addCircle({x:3, y:1, radius:0.25, density:5});
sim.addCircle({x:2, y:1, radius:0.25, density:5});
sim.addCircle({x:4, y:1, radius:0.25, density:5});
sim.addCircle({x:5, y:1, radius:0.25, density:5});
sim.addCircle({x:6, y:1, radius:0.25, density:5});
// create a few platforms  

sim.addBox({x:3, y:2, width:4, height:0.2, density:0, angle:0.1});
// make 26 dominoes  
for (var i:int = 0; i<7; 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});
} 

if (MouseEvent.CLICK) {
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});

sim.start();  
/*sim.mouseDrag();*/  




    }

Answer 1

您应该创建鼠标事件监听器：

addEventListener(MouseEvent.CLICK, add_circle_handler);

function add_circle_handler(event:MouseEvent):void {
      sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
}

不再需要在不再需要添加圆圈时删除事件侦听器。这是与听众合作时的最佳实践（关于内存管理）：

removeEventListener(MouseEvent.CLICK, add_circle_handler);

Answer 2

您需要为鼠标事件添加事件侦听器：

addEventListener(MouseEvent.CLICK, mouseClickHandler);

protected function mouseClickHandler(event:MouseEvent):void
{
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
}

Answer 3

那是因为你正在听老鼠点击错误。

而不是

if (MouseEvent.CLICK) {
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
    sim.start();  
    /*sim.mouseDrag();*/  
}

你需要做

addEventListener(MouseEvent.CLICK, clicked);

function clicked(e:MouseEvent) {

    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
    sim.start();  
    /*sim.mouseDrag();*/ 
}

如果您不需要再收听点击次数，请执行

removeEventListener(MouseEvent.CLICK, clicked);

删除事件监听器（用于释放内存）

AS3：鼠标单击事件不起作用

3 个答案: