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Question by DaiMangouDev · Aug 25, 2017 at 03:52 AM · c#editorwindowzoommatrix4x4

How can I make my EditorWindow Pan and Zoom ;zoom function work ?

I wrote created a Pan and Zoom class, which you can setup in a few seconds to implement a pan and zoom system in an EditorWindow but my zoom function is not working correctly.

Here i the entire script I wrote for generating and pan and zoom area in the EditorWindow. just 90 lines long

Whenever i zoom in it looks perfect but zooming out from a moue position other than where i zoomed in causes unwanted behavior , also the zoom calculations are making gui draw at negative x and y positions get clipped

once you try the script you will notice all the main issues.

    #region Pan and Zoom
 
     public class PanAndZoom
     {
         #region Variables
 
         private Vector2 Offset = Vector2.zero;
         public Vector2 Pan = new Vector2(0, 0);
         public float zoom = 1;
         private Vector2 PanOffset;
         private Matrix4x4 matrix;
         private Matrix4x4 normalMatrix = Matrix4x4.TRS(new Vector3(), Quaternion.identity, Vector3.one);
         private Vector2 mousePos;
 
         #endregion
 
         #region Begin Pan and Zoom Area
 
         public void BeginArea(Rect zoomAndPanArea, float min, float max, bool resetPan)
         {
             GUI.EndGroup();
             #region Pan
             if (Offset == Vector2.zero && Event.current.rawType == EventType.MouseDown)
                 Offset = Event.current.mousePosition;
 
             if (Event.current.rawType == EventType.MouseDrag && (Event.current.button == 2 || Event.current.alt))
             {
                 Pan = Event.current.mousePosition - Offset + PanOffset;
                 Event.current.Use();
             }
 
             if (Event.current.rawType == EventType.MouseUp)
             {
                 Offset = Vector2.zero;
                 PanOffset = Pan;
             }
             #endregion
 
 
             #region zoom
             if (Event.current.type == EventType.ScrollWheel)
             {
                 if (mousePos != Event.current.mousePosition)
                     mousePos = Event.current.mousePosition;
 
                 Vector2 delta = Event.current.delta;
 
 
                 float zoomDelta = -delta.y / 150.0f;
                 zoom += zoomDelta * 4;
                 zoom = Mathf.Clamp(zoom, min, max);
 
                 Event.current.Use();
             }
 
             zoomAndPanArea.x += 0;
             zoomAndPanArea.y += 0;
             zoomAndPanArea.width = Screen.width / zoom;
             zoomAndPanArea.height = Screen.height / zoom;
             GUI.BeginClip(zoomAndPanArea, (Pan * (1f / zoom)), new Vector2(0,-21), resetPan);
 
             Matrix4x4 matrix = GUI.matrix;
             Matrix4x4 lhs = Matrix4x4.TRS(mousePos, Quaternion.identity, new Vector3(zoom, zoom, 1f)) * Matrix4x4.TRS(-mousePos, Quaternion.identity, Vector3.one);
             GUI.matrix = lhs * matrix;
 
 
 
             GUI.Box(zoomAndPanArea, "");
             //   GUI.Box(ThisScreen.ScreenRect, "");
             #endregion
 
 
         }
         #endregion
 
         #region End Pan and Zoom Area
 
         public void EndArea()
         {
             GUI.matrix = normalMatrix;
             GUI.EndClip();
             GUI.BeginGroup(new Rect(0f, 21, Screen.width, Screen.height));
 
 
 
         }
         #endregion
 
 
     }
 
     #endregion


Master @Bunny83 are you there :(

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