如何计算屏幕位置 [英] How calculate screen position

问题描述

我试图找出在Unity二维单位系统是如何工作的。我的游戏画面是800x450像素。

说我希望我的对象被放置在20,20像素从左上角（因为它在大多数二维坐标系的作品）。

我已经试过这两个转换相机的方法，但无论我发生在物体很奇怪的地方，肯定不是从左上角20,20像素。

我的代码：

 的Vector3 TEST1 = Camera.main.ScreenToWorldPoint（新的Vector3（20,20，0））; 
 transform.position = test1的; 
 
的Vector3 TEST2 = Camera.main.WorldToScreenPoint（新的Vector3（20,20，0））; 
 transform.position = test2的; 
  

修改

我已经做了一个试验与得到的屏幕的中心像素。据我的计算Z位置为10，但我的比赛是完全平坦。一切都在2D和我使用正交相机。

代码

 的Vector3 centerInPixels = Camera.main.WorldToScreenPoint（新的Vector3（0，0，0））; 
 //此日志：450,225,10 
 //所以像素中心是正确的800x450，但z是错误的。 
  

解决方案

坐标屏幕空间的系统是：左下角=（ 0,0），右上（pixelWidth，pixelHeight）。因此，正如我理解你想放置对象（20，pixelHeight-20）。这将是

 的Vector3 TEST1 = Camera.main.ScreenToWorldPoint（新的Vector3（20 Camera.main.pixelHeight-20，相机.nearClipPlane））; 
 transform.position = test1的; 
  

I am trying to figure out how the 2D unit system in Unity works. My game screen is 800x450 pixels.

Say I want my object to be placed at 20,20 pixels from the left top (as it works in most 2D coordinate systems).

I have tried both "convert" methods of the camera, but both place my object at very strange locations, certainly not at 20,20 pixels from the left top.

My code:

    Vector3 test1 = Camera.main.ScreenToWorldPoint (new Vector3 (20, 20, 0));
    transform.position = test1;

    Vector3 test2 = Camera.main.WorldToScreenPoint (new Vector3 (20, 20, 0));
    transform.position = test2;

EDIT

I have made a test with getting the center of the screen in pixels. It calculates my Z position as 10, but my game is entirely flat. Everything is in 2D and I'm using the orthographic camera.

Code

Vector3 centerInPixels = Camera.main.WorldToScreenPoint (new Vector3 (0, 0, 0));
// this logs: 450,225,10
// so the pixel center is correct for 800x450, but the z is wrong.

解决方案

Coordinate system of screenspace is: bottom-left=(0,0), top-right (pixelWidth,pixelHeight). So as I understand you trying to place object to (20,pixelHeight-20). That would be

Vector3 test1 = Camera.main.ScreenToWorldPoint (new Vector3 (20, Camera.main.pixelHeight-20, camera.nearClipPlane));
transform.position = test1;    

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