Next: 1 Linestyle Up: Graphics display commands Prev: Examples

4 Graphics control

Graphical output in ASTERIX is controlled by the Graphics-Control-Block (GCB) - a block of shared memory containing flags, switches and attribute values. All commands that produce graphical output interrogate the GCB to determine the precise form of the output.

All quantities in the GCB can be set, cancelled and displayed by the command GSET. Commands in sub-packages such as image processing also set values in the GCB.

Values available for various plotting attributes are given in sub-sections below.

Subtopics:

1 Linestyle
2 Linewidth
3 Line colour
4 Character fonts
5 Character size
6 Character boldness
7 Symbols

Next: 1 Linestyle Up: Graphics display commands Prev: Examples