你好，
如果你的图形是在Canvas上绘制的，可以使用 VisualTreeHelper.FindElementsInHostCoordinates 方法是查看试图元素是否在指定点构成的集合中：http://msdn.microsoft.com/zh-cn/library/cc838402(v=vs.95).aspx
private bool IsCollision(Point p)
{
var hostPoint = this.canvas.TransformToVisual(this.rootVisual).TransformPoint(p);
return CheckCollisionPoint(hostPoint, this.canvas);
}
private bool CheckCollisionPoint(Point point, UIElement subTree)
{
var hits = VisualTreeHelper.FindElementsInHostCoordinates(point, subTree);
return hits.Any(x => x != subTree);
}
这里还有一个视频是关于WP7中使用XNA实现碰撞检测的：http://msdn.microsoft.com/en-us/evalcenter/gg259399.aspx
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