/// <summary>
/// Begins a scaled local area.
/// Returns vector to offset GUI controls with to account for zooming to the pivot.
/// Using adjustGUILayout does that automatically for GUILayout rects. Theoretically can be nested!
/// </summary>
public static Vector2 BeginScale(ref Rect rect, Vector2 zoomPivot, float zoom, bool adjustGUILayout)
{
Rect screenRect;
GUIScaleUtility.BeginNoClip();
screenRect = GUIScaleUtility.GUIToScaledSpace(rect);
rect = Scale(screenRect, screenRect.position + zoomPivot, new Vector2(zoom, zoom));
// Now continue drawing using the new clipping group
GUI.BeginGroup(rect);
rect.position = Vector2.zero; // Adjust because we entered the new group
// Because I currently found no way to actually scale to a custom pivot rather than (0, 0),
// we'll make use of a cheat and just offset it accordingly to let it appear as if it would scroll to the center
// Note, due to that, controls not adjusted are still scaled to (0, 0)
Vector2 zoomPosAdjust = rect.center - screenRect.size / 2 + zoomPivot;
// Take a matrix backup to restore back later on
GUIMatrices.Add(GUI.matrix);
// Scale GUI.matrix. After that we have the correct clipping group again.
GUIUtility.ScaleAroundPivot(new Vector2(1 / zoom, 1 / zoom), zoomPosAdjust);
return(zoomPosAdjust);
}
/// <summary>
/// Ends a scale region previously opened with BeginScale
/// </summary>
public static void EndScale()
{
// Set last matrix and clipping group
if (GUIMatrices.Count == 0)
{
throw new UnityException("GUIScaleUtility: You are ending more scale regions than you are beginning!");
}
GUI.matrix = GUIMatrices[GUIMatrices.Count - 1];
GUIMatrices.RemoveAt(GUIMatrices.Count - 1);
// End the scaled group
GUI.EndGroup();
GUIScaleUtility.RestoreClips();
}