如何让我的hitTestObject（）更precise？ [英] How do I make my hitTestObject() more precise?

问题描述

我正在做一些碰撞检测与圆形和方形，每当圈进来的方形它反弹走改变由* -1的X坐标接触。但是，圆的点击区域是一个正方形，所以即使当它与周围一圈白色区域碰撞时，影响仍然存在。

I'm doing some collision detection with a circle and a square and whenever the circle comes in contact with the square it bounces away changing its X coordinate by *-1. However, the Hit Area of the circle is a square, so even when it collides with the white area around the circle , the affect still occurs.

我的问题是，有没有办法修改的点击区域，以接近像我的圈子？

My question is, is there a way to modify the hit area to closer resemble my circle?

感谢

推荐答案

位图打测试是基于像素的（而不是边界为基础，似雪碧为基础的命中测试），所以它本质上更precise。

Bitmap hit testing is pixel based (instead of boundary-based, like Sprite-based hit testing), so it is inherently more precise.

<一个href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html#hitTest%28%29"相对=nofollow>此处是它的的Adobe文档。

Here are the Adobe docs on it.

这里是它一个很好的教程。

Here is a nice tutorial on it.

和这里是它一个很好的code片断：

And here is a nice code snippet on it:

if (firstObjectBitmapData.hitTest(new Point(firstObject.x, firstObject.y), 255, secondObjectBitmapData, new Point(secondObject.x, secondObject.y), 255))
{
    trace("hit!");
}

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