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Routines |
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Used by the routines at Handler_Helicopter and Reset_UFO_Position.
Generates a random position for the helicopter and validates it. Keeps generating new coordinates until a valid position is found, then clears the spawning flag.
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| Randomise_Position_Loop | 29863 | CALL Generate_Random_Number | Generate a random X coordinate in C and a random Y coordinate in B by calling Generate_Random_Number twice. | |||||||
| 29866 | LD C,A | |||||||||
| 29867 | CALL Generate_Random_Number | |||||||||
| 29870 | LD B,A | |||||||||
| 29871 | CALL Validate_Position | Call Validate_Position and jump back to Randomise_Position_Loop if the position is invalid. | ||||||||
| 29874 | JR C,Randomise_Position_Loop | |||||||||
| 29876 | RES 7,(IY+0) | Clear bit 7 of *IY+0 (mark the helicopter as active/no longer spawning). | ||||||||
| 29880 | RET | Return. | ||||||||
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