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Routines |
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Used by the routines at HandleCircuitMouse and HandleBouncingMouse.
Sets the speed of a robot mouse along the x and y axes from the way it faces, using the table at MouseSpeeds.
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Build a direction index from the facing bits.
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| SetMouseSpeed | B0E7 | LD A,(IX+$07) | Fetch the flags. | |||||
| B0EA | RLCA | Move bit 6 to bit 1. | ||||||
| B0EB | RLCA | |||||||
| B0EC | RLCA | |||||||
| B0ED | AND %00000010 | Keep bit 1. | ||||||
| B0EF | LD B,A | Keep it in B. | ||||||
| B0F0 | LD A,(IX+$00) | Fetch the sprite number. | ||||||
| B0F3 | AND %00000001 | Keep bit 0. | ||||||
| B0F5 | OR B | Combine it with the flip flag. | ||||||
| B0F6 | SLA A | Double it. | ||||||
| B0F8 | LD HL,$B108 | Point HL at MouseSpeeds. | ||||||
| B0FB | CALL AddAToHL | Call AddAToHL. | ||||||
| B0FE | LD A,(HL) | Fetch the speed along the x axis. | ||||||
| B0FF | INC HL | |||||||
| B100 | LD (IX+$09),A | Set the speed along the x axis. | ||||||
| B103 | LD A,(HL) | Fetch the speed along the y axis. | ||||||
| B104 | LD (IX+$0A),A | Set the speed along the y axis. | ||||||
| B107 | RET | Return. | ||||||
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