|
Routines |
| Prev: 40440 | Up: Map | Next: 40518 |
|
Updates an entity of the type 5. When it is in frame 1 the low nibble of field 35 counts down, and when that runs out the entity is freed.
|
||||||||
| UpdatePuffEntity | 40471 | LD A,(IX+1) | Fetch the frame of the entity. | |||||
| 40474 | AND %00001111 | Use bits 0-3. | ||||||
| 40476 | DEC A | Subtract one. | ||||||
| 40477 | JR NZ,UpdatePuffEntity_Test | Jump to UpdatePuffEntity_Test unless it is frame 1. | ||||||
| 40479 | LD (IX+16),A | Set the speed to 0. | ||||||
| 40482 | LD A,(IX+35) | Read field 35 of the entity. | ||||||
| 40485 | LD B,A | Keep it in B. | ||||||
| 40486 | AND %00001111 | Keep the low nibble. | ||||||
| 40488 | SUB 1 | Subtract one. | ||||||
| 40490 | JR C,FreeEntity | Jump to FreeEntity if it was zero. | ||||||
| 40492 | LD C,A | Keep the new count in C. | ||||||
| 40493 | LD A,B | Read field 35 of the entity. | ||||||
| 40494 | AND %11110000 | Keep the high nibble. | ||||||
| 40496 | OR C | Combine it with the new count. | ||||||
| 40497 | LD (IX+35),A | Store it in field 35 of the entity. | ||||||
|
This entry point is used by the routine at UpdateShotEntity.
|
||||||||
| UpdatePuffEntity_Test | 40500 | BIT 7,(IX+1) | Jump to UpdateEntity if bit 7 of the frame of the entity is not set. | |||||
| 40504 | JP Z,UpdateEntity | |||||||
|
This entry point is used by the routine at UpdateDomeEntity.
|
||||||||
| FreeEntity | 40507 | LD (IX+0),0 | Set the type of the entity to 0 to free it. | |||||
| 40511 | SET 7,(IX+1) | Set bit 7 of the frame of the entity, to hide it. | ||||||
| 40515 | JP UpdateEntity_Done | Jump to UpdateEntity_Done. | ||||||
| Prev: 40440 | Up: Map | Next: 40518 |