Displaying an image

This first example simply displays an image in a window. The image is loaded into a tableau which displays images (vgui_image_tableau) and this is put inside a 2D viewer tableau (vgui_viewer2d). The 2D viewer adds the functionality that would commonly be required for viewing 2D images and objects such as zooming and moving which part of the image is displayed.

The viewer2D provides the following functionality:

control and right mouse button	zoom out
control and left mouse button	zoom in
control and middle mouse button	image can be dragged around the display
	area while the button is held down