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Routines |
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Used by the routine at HandlerObjects.
Erases an object that is no longer in view and empties its slot. An empty slot is handled by the pause loop at HandlerObjects_EmptySlot instead.
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| EraseObject | 6B12 | LD A,(HL) | Fetch the sprite ID of the object. | |||||||
| 6B13 | AND A | If A is zero then the slot is empty, so jump to HandlerObjects_EmptySlot. | ||||||||
| 6B14 | JR Z,HandlerObjects_EmptySlot | |||||||||
| 6B16 | PUSH BC | Stash BC and HL on the stack. | ||||||||
| 6B17 | PUSH HL | |||||||||
| 6B18 | PUSH HL | Point IX at the object (using the stack to do so). | ||||||||
| 6B19 | POP IX | |||||||||
| 6B1B | CALL StoreEntity | Copy the position and sprite ID of the object using StoreEntity. | ||||||||
| 6B1E | CALL RemoveEntity | Call RemoveEntity to erase the object from the screen. | ||||||||
| 6B21 | POP HL | Restore HL from the stack. | ||||||||
| 6B22 | XOR A | Set A to 00 ready to empty the slot. | ||||||||
| 6B23 | LD (HL),A | Empty the slot by clearing the sprite ID of the object. | ||||||||
| 6B24 | INC HL | Increment HL by one. | ||||||||
| 6B25 | LD (HL),A | Write 00 to the next byte of the object. | ||||||||
| 6B26 | INC HL | Increment HL by one. | ||||||||
| 6B27 | LD (HL),A | Write 00 to the final byte of the object. | ||||||||
| 6B28 | POP BC | Restore BC from the stack. | ||||||||
| 6B29 | JR NextObject_2 | Jump to NextObject_2. | ||||||||
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