Starts a graphics program.
GRAPH expression [ RESET|CLOSE] [INVISIBLE] [BACKGROUND]
| expression | A character string, or expression that evaluates to a character string. The content of the string is passed to the graphics program call (e.g., parameters). If no parameters are required, specify the null string. |
| RESET | Flushes all internal data buffers to disk. |
| CLOSE | Flushes all internal data buffers to disk, and closes all files not currently in use. |
| INVISIBLE | Executes the graphics program without affecting the screen display. |
| BACKGROUND | Executes the graphics program asynchronously while Zim continues to run. You can continue working, and have a number of graphics sessions running concurrently. |
Note: BACKGROUND is ignored in some operating environments.
The value of the system variable $Graphics identifies the graphics program to be run. If $Graphics has not been assigned a value, the default value is used.
When you exit a graphics program that was not run in the BACKGROUND, execution of your application program resumes following the call to the graphics program.