Screen coordinates (input.mouseposition) convert UI coordinates

Screen coordinates (input.mouseposition) the knowledge points that need to be learned to translate UI coordinates

1: The bottom left corner of the screen coordinates is (0,0), the upper-right corner is (screen.width,screen.height)

2:ui coordinates the start position of the screen center point

Method 1

            Vector2 uisize = canvas.GetComponent<RectTransform>().sizeDelta;//得到画布的尺寸            Vector2 screenpos = Input.mousePosition;            Vector2 screenpos2;            screenpos2.x = screenpos.x - (Screen.width / 2);//转换为以屏幕中心为原点的屏幕坐标            screenpos2.y = screenpos.y - (Screen.height / 2);            Vector2 uipos;//UI坐标            uipos.x = screenpos2.x*  (uisize.x / Screen.width);//转换后的屏幕坐标*画布与屏幕宽高比            uipos.y = screenpos2.y * ( uisize.y / Screen.height);

Method 2

            Vector3 worldPos=Camera.main.ScreenToWorldPoint(Input.mousePosition);//屏幕坐标转换世界坐标            Vector2 uiPos = canvas.transform.InverseTransformPoint(worldPos);//世界坐标转换位本地坐标

Method 3

Vector2 uipos = Vector3.one;RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform,            Input.mousePosition, Camera.main, out uipos);//将屏幕空间点转换为RectTransform的局部空间中位于其矩形平面上的位置。//cam参数是与屏幕点关联的摄像机。对于Canvas中设置为Screen Space - Overlay模式的RectTransform，cam参数应为null。//当在提供PointerEventData对象的事件处理程序中使用ScreenPointToLocalPointInRectangle时，可以使用PointerEventData.enterEventData（用于悬停功能）或PointerEventData.pressEventCamera（用于单击功能）获取正确的摄像头。这将自动为给定事件使用正确的相机（或null）。

Screen coordinates (input.mouseposition) convert UI coordinates