Syntax
'VIEWPORT'(x0,y0,x1,y1)
Description
The 'VIEWPORT' mnemonic sets the graphics display region. The viewport must be wholly contained in the current world coordinates.
| Parameter | Description | 
| x0 | Lower-left horizontal point. | 
| y0 | Lower-left vertical point. | 
| x1 | Upper-right horizontal point. | 
| y1 | Upper-right vertical point. |