Programming and Graphics

324 Introduction to C++ Programming and Graphics

Double buffering

backbuffer ( ) Make vogle draw in the backbuffer;

returns -1 if the device is not up to it

frontbuffer () Make vogle draw in the front buffer;

this will always work

swapbuffers () Swap the front and back buffers

Position

getgp (x, y, z) Get the current graphics position

in world coordinates

getgp2 (x, y) Get the current graphics position

in world coordinates

sgetgp2 (x, y) Get the current screen graphics position

in screen coordinates ranging from -1 to 1