device->erase

device ->erase: graphical

Erase a graphical from the device. The graphical is removed from the device<-graphicals chain of the device, the graphical's graphical<-device is set to @nil and the display is updated.

Note that the graphical is only destroyed if it had no other references. To make sure the graphical is destroyed, use object->free. To be sure all sub-graphicals are removed as well, use visual->destroy.

See also: - graphical->reparent
- device->clear