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Routines |
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Used by the routines at Handle_Sabreman_Walking, Handle_Sabreman_Jumping, Handle_Sabreman_Falling and Handle_Sabreman_Tumbling.
Makes Sabreman tumble. The sprite becomes 24 (the first of the tumbling frames) and the y velocity is set to 192 so that he is thrown upwards. Bit 7 of the redraw flags is cleared.
If the x velocity is zero it is set to 2 or 254 depending on bit 7 of the system variable FRAMES (23672), which makes the direction random. Otherwise the x velocity is negated, so that he bounces back the way he came.
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| Start_Tumbling | 41990 | LD (IX+0),24 | Set the sprite id to 24 (tumbling). | |||||
| 41994 | LD (IX+9),192 | Set the y velocity to 192 (up). | ||||||
| 41998 | RES 7,(IX+15) | Clear bit 7 of the redraw flags. | ||||||
| 42002 | LD A,(IX+6) | Fetch the x velocity. | ||||||
| 42005 | AND A | Jump to Start_Tumbling_Reverse_Velocity if he is moving sideways. | ||||||
| 42006 | JR NZ,Start_Tumbling_Reverse_Velocity | |||||||
| 42008 | LD (IX+6),2 | Set the x velocity to 2. | ||||||
| 42012 | LD A,(23672) | Fetch the low byte of FRAMES. | ||||||
| 42015 | AND %10000000 | Keep only bit 7. | ||||||
| 42017 | JP Z,Update_Object_Sprite | Jump to Update_Object_Sprite if the bit is clear. | ||||||
| 42020 | LD (IX+6),254 | Set the x velocity to 254. | ||||||
| 42024 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
| Start_Tumbling_Reverse_Velocity | 42027 | NEG | Negate the x velocity. | |||||
| 42029 | LD (IX+6),A | Set the new x velocity. | ||||||
| 42032 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
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