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Routines |
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Used by the routine at EnterDoor.
Sets the velocities of the player (offsets 6 and 7) from bits 6-7 of the attribute of a door, using DoorVelocities. This is done by EnterDoor so that the player moves out of the door.
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| SetPlayerVelocity | 39018 | LD A,(IX+5) | Fetch the attribute of the door. | |||||
| 39021 | RLCA | Rotate A left three times. | ||||||
| 39022 | RLCA | |||||||
| 39023 | RLCA | |||||||
| 39024 | AND %00000110 | Keep only bits 1-2, which were bits 6-7. | ||||||
| 39026 | LD C,A | Keep the velocity index in C. | ||||||
| 39027 | LD B,0 | B=0. | ||||||
| 39029 | LD HL,39043 | Point HL at the door velocities at DoorVelocities. | ||||||
| 39032 | ADD HL,BC | Find the velocities for the door in the table. | ||||||
| 39033 | LD A,(HL) | Fetch the X velocity. | ||||||
| 39034 | INC HL | Move HL on to the next byte. | ||||||
| 39035 | LD (60054),A | Update the X velocity of the player (offset 6). | ||||||
| 39038 | LD A,(HL) | Fetch the Y velocity. | ||||||
| 39039 | LD (60055),A | Update the Y velocity of the player (offset 7). | ||||||
| 39042 | RET | Return. | ||||||
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