|
Routines |
| Prev: 57442 | Up: Map | Next: 57578 |
|
Used by the routine at MakeTiles.
Puts the objects of the map for the two columns that are on the screen into the slots for the map objects. The objects of a column are found by adding up the numbers of the objects in the columns before it, from the table at ColumnTable, to get the place in the tables at MapTable and TerrainData. If the second column wraps round to column zero its objects are the first in the tables. The slots of any objects that are free have their flags cleared.
|
||||
| LoadMapObjects | 57487 | LD A,(52823) | The map position. | |
| 57490 | LD B,A | B=A. | ||
| 57491 | LD HL,0 | HL=0. | ||
| 57494 | LD DE,23990 | The column table. | ||
| 57497 | AND A | Jump to LoadMapObjects_Column if A is zero. | ||
| 57498 | JR Z,LoadMapObjects_Column | |||
| LoadMapObjects_Count | 57500 | LD A,(DE) | Read DE. | |
| 57501 | CALL AddAToHL | Call AddAToHL. | ||
| 57504 | INC DE | Advance DE. | ||
| 57505 | DJNZ LoadMapObjects_Count | Decrease B and jump to LoadMapObjects_Count until none remain. | ||
| LoadMapObjects_Column | 57507 | LD (52794),HL | The column of the map objects. | |
| 57510 | ADD HL,HL | Double HL. | ||
| 57511 | EX DE,HL | Swap DE and HL. | ||
| 57512 | LD A,(HL) | Read HL. | ||
| 57513 | LD (56821),A | Update the column counts. | ||
| 57516 | INC HL | Advance HL. | ||
| 57517 | LD A,(HL) | Read HL. | ||
| 57518 | LD (56822),A | The object count of the next column. | ||
| 57521 | LD IX,24087 | The terrain data. | ||
| 57525 | ADD IX,DE | IX gains DE. | ||
| 57527 | LD DE,23700 | The map table. | ||
| 57530 | LD HL,(52794) | Fetch the word at ScratchValues into HL. | ||
| 57533 | ADD HL,DE | HL gains DE. | ||
| 57534 | LD A,(52823) | The map position. | ||
| 57537 | LD C,A | C=A. | ||
| 57538 | LD A,(56821) | The column counts. | ||
| 57541 | LD B,A | B=A. | ||
| 57542 | CALL AddMapObjects | Call AddMapObjects. | ||
| 57545 | LD A,(56823) | The next column. | ||
| 57548 | AND A | Jump to LoadMapObjects_Second if A is not zero. | ||
| 57549 | JR NZ,LoadMapObjects_Second | |||
| 57551 | LD HL,0 | HL=0. | ||
| 57554 | LD (52794),HL | The column of the map objects. | ||
| 57557 | LD HL,23700 | The map table. | ||
| 57560 | LD IX,24087 | The terrain data. | ||
| LoadMapObjects_Second | 57564 | LD C,A | C=A. | |
| 57565 | LD A,(56822) | The object count of the next column. | ||
| 57568 | LD B,A | B=A. | ||
| 57569 | CALL AddMapObjects | Call AddMapObjects. | ||
| 57572 | LD B,4 | B=4. | ||
| 57574 | LD IX,43019 | The map object slots. | ||
|
Continue on to ClearFreeSlotFlags.
|
||||
| Prev: 57442 | Up: Map | Next: 57578 |