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Routines |
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The handler for the chocolate (IDs 10 and 11), which drifts about in random directions. Every 10 frames a new random direction is picked and stored in byte 06 of the actor (bit 0 is set for down, and bit 1 is set for right). The speeds are changed by one every other frame towards that direction, up to a maximum speed of 02 in either direction.
While the chocolate is still entering from the right of the screen (a horizontal co-ordinate of C4 or more) it is only moved.
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| HandleChocolate | 69D4 | CALL StoreEntity | Record the position of the sprite using StoreEntity. | |||||
| 69D7 | LD HL,$5F1B | Point HL at ActorsInPlay. | ||||||
| 69DA | INC (HL) | Increase the number of actors in play by one. | ||||||
| 69DB | LD A,(IX+$01) | Fetch the horizontal co-ordinate. | ||||||
| 69DE | CP $C4 | Jump to ChangeActorSpeeds_Move if the chocolate is still entering from the right. | ||||||
| 69E0 | JR NC,ChangeActorSpeeds_Move | |||||||
| 69E2 | CALL TestCharlieCollision | Test whether the actor has hit Charlie using TestCharlieCollision. | ||||||
| 69E5 | DEC E | Has Charlie been hit (is E now zero)? | ||||||
| 69E6 | JP Z,LoseHat | Jump to LoseHat if Charlie has been hit. | ||||||
| 69E9 | CALL TestFlourCollision | Test whether a flour shot has hit the actor using TestFlourCollision. | ||||||
| 69EC | BIT 7,(IX+$00) | Jump to HandleHitActor if the actor has been hit. | ||||||
| 69F0 | JP NZ,HandleHitActor | |||||||
| 69F3 | LD (IX+$03),$42 | Set the actor colour to 42 (red). | ||||||
| 69F7 | LD A,(IX+$07) | Fetch the frame counter (byte 07 of the actor). | ||||||
| 69FA | AND %00001111 | Keep only bits 0-3. | ||||||
| 69FC | JR NZ,ChangeActorSpeeds | Jump to ChangeActorSpeeds if the counter is not a multiple of 10. | ||||||
| 69FE | LD A,R | Fetch a random number. | ||||||
| 6A00 | AND %00000011 | Keep only bits 0-1. | ||||||
| 6A02 | LD (IX+$06),A | Set a random direction (byte 06 of the actor). | ||||||
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