在CocosSharp图层上添加缩放

using CocosSharp;

public class MyLayer : CCLayer
{
    private CCPoint touchStart1;
    private CCPoint touchStart2;
    private float startDistance;

    protected override void OnTouchesBegan(List<CCTouch> touches, CCEvent touchEvent)
    {
        if (touches.Count >= 2)
        {
            touchStart1 = touches[0].Location;
            touchStart2 = touches[1].Location;
            startDistance = CCPoint.Distance(touchStart1, touchStart2);
        }
    }

    protected override void OnTouchesMoved(List<CCTouch> touches, CCEvent touchEvent)
    {
        if (touches.Count >= 2)
        {
            var touch1 = touches[0].Location;
            var touch2 = touches[1].Location;
            var currentDistance = CCPoint.Distance(touch1, touch2);

            var scale = currentDistance / startDistance;
            this.Scale = scale;
        }
    }

    protected override void OnTouchesEnded(List<CCTouch> touches, CCEvent touchEvent)
    {
        touchStart1 = CCPoint.Zero;
        touchStart2 = CCPoint.Zero;
        startDistance = 0f;
    }
}