世界坐标转UGUI屏幕坐标

刀锋狼

UGUI在使用Carema作为摄像机时，需要通过Canvas下的Canvas Scaler组件的referenceResolution参数来计算屏幕缩放比：    例如   

1. float offect = (Screen.width / canvasScaler.referenceResolution.x) * (1 - canvasScaler.matchWidthOrHeight) + (Screen.height / canvasScaler.referenceResolution.y) * canvasScaler.matchWidthOrHeight;

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通过上面这段代码来计算坐标的缩放比，具体坐标转化代码如下：

1. CanvasScaler canvasScaler = GameObject.Find("Canvas").gameObject.GetComponent<CanvasScaler>();
   
2.         float resolutionX = canvasScaler.referenceResolution.x;
   
3.         float resolutionY = canvasScaler.referenceResolution.y;
   
4.         float offect = (Screen.width / canvasScaler.referenceResolution.x) * (1 - canvasScaler.matchWidthOrHeight) + (Screen.height / canvasScaler.referenceResolution.y) * canvasScaler.matchWidthOrHeight;
   
5.         Vector2 a =RectTransformUtility.WorldToScreenPoint(Camera.main, plant[index].transform.GetChild(0).transform.position);
   
6.         return new Vector3(a.x / offect, a.y / offect, 0);

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这样，就会得到屏幕上的UI坐标
注意！！
记得把描点设置到右下角，这样计算才会得到正确的坐标