A fast and easily customised operating system
for ARM devices
Page "Wimp_Poll/versions/5" does not exist. Please create it now, or hit the "back" button in your browser.
Draw_Fill Path Block
Programmer's Reference Manuals
» Part 8 - Non-kernel input/output
» Draw Module
» SWI Calls
» Draw_Fill
» Path Block
Path Block
| Code | Parameters | Meaning |
|---|---|---|
| 0 | - | End of path (when writing a path, a parameter is used to indicate the remaining length of the block, which is updated as data is written and the end of path marker is moved) |
| 1 | Pointer | Continuation of path at pointer |
| 2 | X, Y | Move to x,y starting a new sub-path |
| 3 | X, Y | Move to x,y without starting a new sub-path (internal use) |
| 4 | - | Close sub-path with move |
| 5 | - | Close sub-path with line |
| 6 | CX1, CY1, CX2, CY2, X, Y | Bezier curve to x,y using control points cx1, cy1 and cx2, cy2 |
| 7 | X, Y | Move to x,y without starting a new sub-path (mostly used for internal use) |
| 8 | X, Y | Line to x,y |
Notes
Draw path blocks consist of a block of words; code(element type) followed by any parameters. The block is terminated by an ‘End of Path’ element.
There are some order constraints on these codes (element types):
- path elements 2 and 3 start new subpaths
- path elements 6,7 and 8 may only appear while there is a current subpath
- path elements 4 and 5 may only appear while there is a current subpath, and end it, leaving no current subpath
- path elements 2 and 3 can also be used to close the current subpath (which is part of starting a new subpath)