device->clear

device ->clear: [{destroy,free,erase}]

Remove all graphicals from the device. The argument controls what happens to the removed graphicals. By default it uses device->erase, leaving destruction to the reference-count garbage collector. Using free the graphicals will be send a object->free, ensuring destruction of the graphicals, but not their parts and using destroy ensures deep destruction of the displayed graphicals based on visual->destroy.

See also: device->erase