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Question by shawnthondoya · Oct 26, 2021 at 12:37 PM · 2d sprites

How can i drag 2D sprites in unity 2020?

I'm creating a simple simulation where dragging and dropping is the main method of interacting with the user. My problem is that while UI elements are easily dragged around the scene, My 2D sprites cannot be dragged, even though the event shoots up on the console with Debug.Log. Here is the code I'm using to drag the sprites:

private Vector3 screenPoint; private Vector3 offset;

 void OnMouseDown()
 {
     offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
 }

 void OnMouseDrag()
 {
     Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
     Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
     transform.position = curPosition;
     Debug.Log("dragged");
 }
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Answer by unity_MXGApNcapNfNLg · Oct 27, 2021 at 02:15 PM

You need to consider the camera position in order to get the offset. Here is the rectified code:

private Vector3 offset; void OnMouseDown() {

     offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, -Camera.main.transform.position.z));
 }

 void OnMouseDrag()
 {
     Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, -Camera.main.transform.position.z);
     Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
     transform.position = curPosition;
 }
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avatar image shawnthondoya · Oct 28, 2021 at 06:16 AM 0
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Thanks! I feel stupid for not realizing that.

avatar image unity_MXGApNcapNfNLg shawnthondoya · Oct 28, 2021 at 08:43 AM 0
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Welcome :-)

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