Draw a rectangle

Hi there!

Is it possible to draw a rectangle over my Image? For example, I got an image from an active viewport

	// Get the active viewport
	var oViewportMgr = MainWindow.getViewportMgr();
	var oViewport = oViewportMgr.getActiveViewport().get3DViewport();

	// Capture the contents of the active viewport
	var fullImage = oViewport.captureImage();

Now, I need to draw a rectangle over this image at the point (10,10) with size (100,100).

How can I do that without drawing it pixel by pixel or loading a frame from another image on the hard drive?

Thank you!