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Routines |
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Used by the routine at FireWeapon.
Starts a streamer in the weapon slot held in FreeWeaponSlot, in front of Robbie. It is not fired if Robbie is too close to the edge of the play area. The colour of the streamer is chosen at random.
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| FireStreamer | 69BB | CALL GetRobbieDirection | Get the X position and the direction using GetRobbieDirection. | |||||||
| 69BE | JR Z,FireStreamer_Right | Jump to FireStreamer_Right if the streamer goes to the right. | ||||||||
| 69C0 | CP $38 | Return if Robbie is too close to the left edge. | ||||||||
| 69C2 | RET C | |||||||||
| 69C3 | SUB $0C | Subtract 0C from the X position (so it starts to the left of Robbie). | ||||||||
| 69C5 | LD (HL),$52 | Write 52 (a streamer moving left) to the state of the weapon. | ||||||||
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This entry point is used by the routine at FireStreamer_Right.
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| FireStreamer_Colour | 69C7 | PUSH AF | Stash the X position on the stack. | |||||||
| 69C8 | PUSH HL | Stash the weapon object on the stack. | ||||||||
| 69C9 | LD A,($5E19) | A=the random number from RandomNumber. | ||||||||
| 69CC | AND %00000011 | Keep only bits 0-1 (a random colour number from 00 to 03). | ||||||||
| 69CE | LD C,A | C=the random colour number. | ||||||||
| 69CF | LD B,$00 | Clear the high byte of the offset in B. | ||||||||
| 69D1 | LD HL,$69DB | HL=StreamerColours. | ||||||||
| 69D4 | ADD HL,BC | Add the offset to find the colour in the table. | ||||||||
| 69D5 | LD B,(HL) | B=the colour of the streamer. | ||||||||
| 69D6 | POP HL | Restore the weapon object from the stack. | ||||||||
| 69D7 | POP AF | Restore the X position from the stack. | ||||||||
| 69D8 | JP CreateWeapon | Jump to CreateWeapon to create the weapon. | ||||||||
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