Sub-contexts can be resized, but not their parents (i.
e. anything returned by @new or set up by set_mode cannot be resized – because this could lead to irrecoverable "loss" of drawing memory.
The coordinate arguments (x1 through y2) are interpreted relative to the parent context's limits.
| this |
the context |
| x1 |
the new left bounds |
| y1 |
the new top bounds |
| x2 |
the new right bounds |
| y2 |
the new bottom bounds |