Subclassing worlds
Factor handbook > UI framework > Implementing new gadgets > Customizing gadget appearance > Implementing custom drawing logic

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The world gadget can be subclassed, giving Factor code full control of the window's OpenGL context. The following generic words can be overridden to replace standard UI behavior:
begin-world ( world -- )

end-world ( world -- )

resize-world ( world -- )

draw-world* ( world -- )

See the spheres and bunny demos for examples.