qdosmsq:traps:trap_3:blok
Table of Contents
SD_FILL/IOW_BLOK
This trap fills a rectangular block in a window.
| Call Parameters | Return Parameters | ||
|---|---|---|---|
| D0.B | $2E | D0.L | Error return. |
| D1.B | Colour | D1.L | Corrupted. |
| D3.W | Timeout | D3.L | Preserved. |
| A0.L | Channel ID | A0.L | Preserved. |
| A1.L | Address of block definition | A1.L | Corrupted. |
Errors
| ERR_NC | Not complete. |
| ERR_NO | Channel not open. |
| ERR_OR | Block outside window. |
Notes
- All registers not shown above are not used on entry and are preserved on exit.
- A1.L points to a block definition of four words:
- X-size
- Y-size
- X-origin (relative to window origin)
- Y-origin (relative to window origin)
Example
The example below shows the use of this trap call to fill a block with grey stipple. It is assumed that A0 contains the window's ID.
blck moveq #sd_fill,d0 ; $2E
moveq #-1,d1 ; Grey stipple
moveq #-1,d3 ; Timeout
lea bk,a1 ; Block definition
trap #3 ; Draw the block
tst.l d0 ; OK? . .
bne error ; . . no!
bk dc.w 200,100 ; Size of block
dc.w 10,20 ; Origin in window
qdosmsq/traps/trap_3/blok.txt · Last modified: 2009/05/17 14:26 by george.gwilt
