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Routines |
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Used by the routines at RunPentagramStone and RunHelper.
Sets the speeds of an object along x and y to one in the direction that takes it towards a target, or to nothing if it is already in line with the target on an axis. The target is held at 21 and 22 of the record.
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Set the speed along x towards the target.
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| SteerTowardsTarget | 53381 | LD A,(IX+1) | Fetch the x position of the object. | |||||
| 53384 | CP (IX+21) | Jump to SteerTowardsTarget_Y if it is the same as the target. | ||||||
| 53387 | JR Z,SteerTowardsTarget_Y | |||||||
| 53389 | JR C,SteerTowardsTarget_X | Jump to SteerTowardsTarget_X if it is lower. | ||||||
| 53391 | LD (IX+9),255 | Set the speed along x to 255. | ||||||
| 53395 | JR SteerTowardsTarget_Y | Jump to SteerTowardsTarget_Y. | ||||||
| SteerTowardsTarget_X | 53397 | LD (IX+9),1 | Set the speed along x to 1. | |||||
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Set the speed along y towards the target.
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| SteerTowardsTarget_Y | 53401 | LD A,(IX+2) | Fetch the y position of the object. | |||||
| 53404 | CP (IX+22) | Return if it is the same as the target. | ||||||
| 53407 | RET Z | |||||||
| 53408 | JR C,SteerTowardsTarget_UpY | Jump to SteerTowardsTarget_UpY if it is lower. | ||||||
| 53410 | LD (IX+10),255 | Set the speed along y to 255. | ||||||
| 53414 | RET | Return. | ||||||
| SteerTowardsTarget_UpY | 53415 | LD (IX+10),1 | Set the speed along y to 1. | |||||
| 53419 | RET | Return. | ||||||
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