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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 18 (the first of the tumbling frames) and the y velocity is set to C0 so that he is thrown upwards. Bit 7 of the redraw flags is cleared.
If the x velocity is zero it is set to 02 or FE depending on bit 7 of the system variable FRAMES (5C78), 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 | A406 | LD (IX+$00),$18 | Set the sprite id to 18 (tumbling). | |||||
| A40A | LD (IX+$09),$C0 | Set the y velocity to C0 (up). | ||||||
| A40E | RES 7,(IX+$0F) | Clear bit 7 of the redraw flags. | ||||||
| A412 | LD A,(IX+$06) | Fetch the x velocity. | ||||||
| A415 | AND A | Jump to Start_Tumbling_Reverse_Velocity if he is moving sideways. | ||||||
| A416 | JR NZ,Start_Tumbling_Reverse_Velocity | |||||||
| A418 | LD (IX+$06),$02 | Set the x velocity to 02. | ||||||
| A41C | LD A,($5C78) | Fetch the low byte of FRAMES. | ||||||
| A41F | AND %10000000 | Keep only bit 7. | ||||||
| A421 | JP Z,Update_Object_Sprite | Jump to Update_Object_Sprite if the bit is clear. | ||||||
| A424 | LD (IX+$06),$FE | Set the x velocity to FE. | ||||||
| A428 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
| Start_Tumbling_Reverse_Velocity | A42B | NEG | Negate the x velocity. | |||||
| A42D | LD (IX+$06),A | Set the new x velocity. | ||||||
| A430 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
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