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Routines |
| Prev: B06B | Up: Map | Next: B0DD |
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Used by the routines at HandleCircuitMouse and TurnMouseOtherWay.
Turns a robot mouse a quarter turn. The way it faces is held in bit 0 of its sprite number and bit 6 of its flags. They go west, south, east, north: (bit 0, bit 6) = (00, 00), (01, 01), (01, 00) and (00, 01).
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The mouse is facing west or north.
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| TurnMouseOneWay | B0AD | BIT 0,(IX+$00) | Jump to TurnMouseOneWay_BitSet if bit 0 of the sprite number is set. | |||||
| B0B1 | JR NZ,TurnMouseOneWay_BitSet | |||||||
| B0B3 | BIT 6,(IX+$07) | Jump to TurnMouseOneWay_FlippedBitClear if the sprite is flipped. | ||||||
| B0B7 | JR NZ,TurnMouseOneWay_FlippedBitClear | |||||||
| B0B9 | SET 0,(IX+$00) | Set bit 0 of the sprite number. | ||||||
| TurnMouseOneWay_Flip | B0BD | SET 6,(IX+$07) | Set bit 6 of the flags. | |||||
| B0C1 | RET | Return. | ||||||
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The mouse is facing south or east.
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| TurnMouseOneWay_BitSet | B0C2 | BIT 6,(IX+$07) | Jump to TurnMouseOneWay_FlippedBitSet if the sprite is flipped. | |||||
| B0C6 | JR NZ,TurnMouseOneWay_FlippedBitSet | |||||||
| B0C8 | RES 0,(IX+$00) | Reset bit 0 of the sprite number. | ||||||
| B0CC | JR TurnMouseOneWay_Flip | Jump to TurnMouseOneWay_Flip. | ||||||
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The mouse is facing north.
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| TurnMouseOneWay_FlippedBitClear | B0CE | RES 0,(IX+$00) | Reset bit 0 of the sprite number. | |||||
| TurnMouseOneWay_Unflip | B0D2 | RES 6,(IX+$07) | Reset bit 6 of the flags. | |||||
| B0D6 | RET | Return. | ||||||
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The mouse is facing south.
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| TurnMouseOneWay_FlippedBitSet | B0D7 | SET 0,(IX+$00) | Set bit 0 of the sprite number. | |||||
| B0DB | JR TurnMouseOneWay_Unflip | Jump to TurnMouseOneWay_Unflip. | ||||||
| Prev: B06B | Up: Map | Next: B0DD |