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Routines |
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Used by the routine at JumpTable_AdvanceEntity.
Advances an entity by its stored deltas.
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| Advance_Entity | F804 | LD C,(IX+$00) | C=the column and B=the row. | |||||||||||||||
| F807 | LD B,(IX+$01) | |||||||||||||||||
| F80A | LD A,(IX+$08) | Add *IX+08 to the fine-X. | ||||||||||||||||
| F80D | ADD A,(IX+$02) | |||||||||||||||||
| F810 | CP $08 | Jump to Advance_Entity_Branch2 if the fine-X is still in range. | ||||||||||||||||
| F812 | JR C,Advance_Entity_Branch2 | |||||||||||||||||
| F814 | CP $80 | Jump to Advance_Entity_Branch if the entity moved left. | ||||||||||||||||
| F816 | JR NC,Advance_Entity_Branch | |||||||||||||||||
| F818 | INC C | Step the column two right, then... | ||||||||||||||||
| F819 | INC C | |||||||||||||||||
| Advance_Entity_Branch | F81A | DEC C | ...one left. | |||||||||||||||
| F81B | AND %00000111 | Keep only bits 0-2. | ||||||||||||||||
| Advance_Entity_Branch2 | F81D | LD E,A | Store the fine-X. | |||||||||||||||
| F81E | LD A,(IX+$09) | Add *IX+09 to the fine-Y. | ||||||||||||||||
| F821 | ADD A,(IX+$03) | |||||||||||||||||
| F824 | CP $08 | Jump to Advance_Entity_Branch4 if the fine-Y is still in range. | ||||||||||||||||
| F826 | JR C,Advance_Entity_Branch4 | |||||||||||||||||
| F828 | CP $80 | Jump to Advance_Entity_Branch3 if the entity moved up. | ||||||||||||||||
| F82A | JR NC,Advance_Entity_Branch3 | |||||||||||||||||
| F82C | INC B | Step the row two down, then... | ||||||||||||||||
| F82D | INC B | |||||||||||||||||
| Advance_Entity_Branch3 | F82E | DEC B | ...one up. | |||||||||||||||
| F82F | AND %00000111 | Keep only bits 0-2. | ||||||||||||||||
| Advance_Entity_Branch4 | F831 | LD D,A | Store the fine-Y. | |||||||||||||||
| F832 | RET | Return. | ||||||||||||||||
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View the equivalent code in Booty.
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