AS3 围绕其中心点旋转对象 [英] AS3 Rotate an object around its center point
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问题描述
我希望这个对象围绕它的中心而不是左上角旋转.代码如下所示:
I want this object to rotate around its center rather than the top left corner. The code looks like this:
switch (event.keyCode)
{
case 37:
car.rotation = -90;
car.x -= 5;
break;
所以当我按下左键时,汽车向左转,但现在它跳起来了一点,因为它绕着顶角旋转.
So when i press the left key, the car turns left but as it is now it jumps up a bit because its rotating around the top corner.
谢谢
推荐答案
以下内容将围绕中心旋转:
The following will rotate around center :
public function rotateAroundCenter(object:DisplayObject, angleDegrees:Number):void {
if (object.rotation == angleDegrees) {
return;
}
var matrix:Matrix = object.transform.matrix;
var rect:Rectangle = object.getBounds(object.parent);
var centerX = rect.left + (rect.width / 2);
var centerY = rect.top + (rect.height / 2);
matrix.translate(-centerX, -centerY);
matrix.rotate((angleDegrees / 180) * Math.PI);
matrix.translate(centerX, centerY);
object.transform.matrix = matrix;
object.rotation = Math.round(object.rotation);
}
它将对象的中心平移到 0,0,然后旋转它,然后将其平移回来.
It translates the center of the object to 0,0 then rotate it and then translate it back.
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