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Routines |
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The handler for the explosion (IDs 26 and 27) which is shown when a flour shot ends. The sprite is chosen by the lowest bit of a counter in byte 07 of the actor, which starts at 03 and counts down to zero.
The sprite is drawn each time without the previous one being erased. As the sprites are drawn using exclusive OR, drawing the two frames in turn leaves the screen blank after the fourth time, so the explosion is removed when the counter reaches zero.
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| HandleExplosion | 65E8 | LD A,(IX+$07) | Fetch the explosion counter. | |||||
| 65EB | AND %00000001 | Keep only bit 0 (which of the two frames of the explosion to show). | ||||||
| 65ED | ADD A,$26 | Add 26 to get the ID of the frame. | ||||||
| 65EF | LD (IX+$00),A | Set the actor ID to the ID of the frame. | ||||||
| 65F2 | CALL DrawEntity | Draw the explosion using DrawEntity. | ||||||
| 65F5 | CALL ColourSprite | Colour the sprite using ColourSprite. | ||||||
| 65F8 | LD A,(IX+$07) | Fetch the explosion counter. | ||||||
| 65FB | AND A | Has the explosion finished (is the counter zero)? | ||||||
| 65FC | JR Z,HandleExplosion_Remove | Jump to HandleExplosion_Remove if it has. | ||||||
| 65FE | DEC (IX+$07) | Decrease the explosion counter by one. | ||||||
| 6601 | RET | Return. | ||||||
| HandleExplosion_Remove | 6602 | LD (IX+$00),$00 | Remove the explosion by writing 00 to the actor ID. | |||||
| 6606 | RET | Return. | ||||||
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