Unity 3D Game Development by Example

Time for action - commence operation pie clock

Let's lay down some code to make those half-circle pieces rotate.

1. Set up a conditional statement so that we can draw different things before and after the halfway point:

   GUI.DrawTexture(clockRect, back, ScaleMode.StretchToFill, true, 0);
   if(isPastHalfway)
   {
   } else {
   }
   

2. If we're not past halfway, rotate the GUI around the centerPoint. Draw the right side half-circle piece on top of the rotated GUI. Then, rotate the GUI back to its start position.

   if(isPastHalfway)
   {
   }
   else
   {
   GUIUtility.RotateAroundPivot(-rot, centerPoint);
   GUI.DrawTexture(clockRect, rightSide, ScaleMode.StretchToFill, true, 0);
   GUI.matrix = startMatrix;
   }
   

3. Save the script and test your game. You should see the right side half-circle ...