VDU 23,8,base_start,base_end,x1,y1,x2,y2,0,0
This VDU clears a block of the text window to the text background colour. The block is defined in terms of offsets x1,y1 and x2,y2 given from base positions:
Value Meaning Value Meaning Value Meaning
0 window top left 1 cursor column top 2 window off top right
4 cursor line left 5 cursor postion 6 cursor line off right
8 window bottom left 9 cursor column bottom 10 window off bottom right
(where "off" is one char beyond in the positive X direction)
(see VDU 23,16 to change X and Y directions, and sense of positive)
The result is undefined if and base + offset is outside the range -128,127. If the end point lies before the start point no clearing occurs.
[sh-index] Back to list of manuals
|
| |
