|
Routines |
| Prev: 28363 | Up: Map | Next: 28432 |
|
Used by the routines at HandlerAccelerate and HandlerSteering.
|
||||||||||
|
||||||||||
| DrawGaugeLine | 28382 | SRL A | Scale the gauge level down by 4 to give the number of pixels to fill, in C. | |||||||
| 28384 | SRL A | |||||||||
| 28386 | LD C,A | |||||||||
|
Decrease gauge count by 8 and keep looping around until what's left is < 8 - then handle this part separately.
|
||||||||||
| DrawGaugeLine_Loop | 28387 | LD A,C | Take 8 away from the pixel count. | |||||||
| 28388 | SUB 8 | |||||||||
| 28390 | JR C,DrawGaugeScreen_Last | If gauge count < 8 then jump to DrawGaugeScreen_Last. | ||||||||
| 28392 | LD C,A | Keep the remaining pixel count in C. | ||||||||
| 28393 | LD A,255 | Set a full line of pixels, 255. | ||||||||
| 28395 | CALL DrawGaugeScreen | Draw a full cell of the gauge using DrawGaugeScreen. | ||||||||
| 28398 | JR DrawGaugeLine_Loop | Jump to DrawGaugeLine_Loop. | ||||||||
|
Handles drawing the last section of the gauge level.
|
||||||||||
| DrawGaugeScreen_Last | 28400 | LD B,0 | Create an offset in BC (B=0 C=gauge count). | |||||||
| 28402 | PUSH HL | Stash the gauge screen location temporarily. | ||||||||
| 28403 | LD HL,28423 | Point HL at the gauge data (GaugeData + the remaining pixel count). | ||||||||
| 28406 | ADD HL,BC | |||||||||
| 28407 | LD A,(HL) | Fetch the pixels for the end of the gauge. | ||||||||
| 28408 | POP HL | Restore the gauge screen location from the stack. | ||||||||
| 28409 | CALL DrawGaugeScreen | Call DrawGaugeScreen. | ||||||||
| 28412 | XOR A | A=0 (no pixels - i.e. masking). | ||||||||
|
Writes A to the screen.
|
||||||||||
| DrawGaugeScreen | 28413 | PUSH HL | Stash the gauge screen location temporarily. | |||||||
| 28414 | LD B,7 | B=7 (counter for number of lines to draw). | ||||||||
| DrawGaugeScreen_Loop | 28416 | LD (HL),A | Write A to the screen location held by HL. | |||||||
| 28417 | INC H | Increment H by one to move onto the next row. | ||||||||
| 28418 | DJNZ DrawGaugeScreen_Loop | Decrease counter by one and loop back to DrawGaugeScreen_Loop until counter is zero. | ||||||||
| 28420 | POP HL | Restore the original gauge screen location from the stack. | ||||||||
| 28421 | INC L | Increment L by one to move onto the next column. | ||||||||
| 28422 | RET | Return. | ||||||||
|
Gauge data; each value corresponds to a "full" line for 9 decreasing values. This completes the "end" section when drawing a gauge line.
|
||||||||||
| GaugeData | 28423 | DEFB 0 |  |
|||||||
| 28424 | DEFB 128 | |||||||||
| 28425 | DEFB 192 | |||||||||
| 28426 | DEFB 224 | |||||||||
| 28427 | DEFB 240 | |||||||||
| 28428 | DEFB 248 | |||||||||
| 28429 | DEFB 252 | |||||||||
| 28430 | DEFB 254 | |||||||||
| 28431 | DEFB 255 | |||||||||
| Prev: 28363 | Up: Map | Next: 28432 |
