Knight Tyme (48k): Routine at 29142

29142: Paint room layout data entry's terrain interaction parameters, applying vertical mirror (room drawing)

Used by the routine at 28070.

See also analogous routine at 28906 (RLE attribute data painting)

Input
HL	Points to entry in lookup table for RLE terrain interaction data (room layout graphics) (at 51997)

Output
B	y-coordinate of graphic's top
C	x-coordinate of graphic's right

29142

PUSH HL

Store HL (current entry in lookup table for RLE terrain interaction data)

29143

LD HL,23493

Modify instruction at 29220 to load x-coordinate of graphic's left edge into A...

29146

LD (29221),HL

...i.e. set end x-coordinate for painting right-to-left

29149

LD HL,29241

Modify instruction at 29224 to jump to 29241...

29152

LD (29225),HL

...i.e. advance HL down one character row in terrain interaction data table at 24064

29155

LD A,43

Modify instruction at 29227 with opcode 43 (DEC HL)...

29157

LD (29227),A

...

29160

POP HL

Restore HL (current entry in lookup table for RLE terrain interaction data)

29161

Store coordinates of area to be coloured and point IX at RLE terrain interaction data

29164

LD A,(23495)

Load C with x-coordinate of graphic's right edge...

29167

LD C,A

...

29168

LD A,(23494)

Load B with y-coordinate of graphic's top edge...

29171

LD B,A

...

29172

Jump to terrain interaction data painting routine