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Routines |
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Used by the routines at SLOW_CHASER and SPARK_CHASER.
Sets the step in U and V to plus or minus the given speeds, each pointing from the object towards the robot's legs (PLAYER_U and the V after it) along its axis. The sign comes from the difference, so it is right while the two are less than 128 apart; level with him, the object steps the negative way. Knight Lore's move_towards_plyr, byte for byte in its logic.
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| MOVE_TOWARDS_PLAYER | B165 | LD HL,PLAYER_U | own U less his U | |||||||||
| B168 | LD A,(IX+$01) | |||||||||||
| B16B | SUB (HL) | |||||||||||
| B16C | INC HL | |||||||||||
| B16D | LD A,C | +C if he is further along U, else -C | ||||||||||
| B16E | JP M,MOVE_TOWARDS_PLAYER_0 | |||||||||||
| B171 | NEG | |||||||||||
| MOVE_TOWARDS_PLAYER_0 | B173 | LD (IX+$09),A | ||||||||||
| B176 | LD A,(IX+$02) | own V less his V | ||||||||||
| B179 | SUB (HL) | |||||||||||
| B17A | INC HL | |||||||||||
| B17B | LD A,B | +B if he is further along V, else -B | ||||||||||
| B17C | JP M,MOVE_TOWARDS_PLAYER_1 | |||||||||||
| B17F | NEG | |||||||||||
| MOVE_TOWARDS_PLAYER_1 | B181 | LD (IX+$0A),A | ||||||||||
| B184 | RET | |||||||||||
| Prev: B110 | Up: Map | Next: B185 |