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Routines |
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Used by the routine at UpdateFuelGauge.
Used on odd frames. When the fuel is low (the gauge level is at least 98) the colour of the fuel gauge alternates between red and yellow every other frame, otherwise it is yellow. ColourFuelGauge_Yellow is the entry point that always uses yellow.
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| ColourFuelGauge | CAA7 | LD A,($9A64) | Fetch the frame counter from FrameCounter. | |
| CAAA | LD B,A | Keep it, so the next bit can be tested as well. | ||
| CAAB | AND %00000001 | Is this an odd frame? | ||
| CAAD | RET Z | Return on an even frame. | ||
| CAAE | LD A,($CC4C) | Fetch the row of the top of the fuel. | ||
| CAB1 | CP $98 | Use yellow if the tank is not low. | ||
| CAB3 | JR C,ColourFuelGauge_Yellow | |||
| CAB5 | BIT 1,B | Use yellow on the frames when bit 1 is clear. | ||
| CAB7 | JR Z,ColourFuelGauge_Yellow | |||
| CAB9 | LD A,$42 | Otherwise use red (42). | ||
| CABB | JR ColourFuelGauge_Fill | Fill the gauge with it. | ||
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This entry point is used by the routine at DrawHUD.
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| ColourFuelGauge_Yellow | CABD | LD A,$46 | The normal colour of the gauge is yellow (46). | |
| ColourFuelGauge_Fill | CABF | LD ($CBAD),A | Store the chosen colour in the gauge attributes. | |
| CAC2 | LD HL,$BFF0 | The gauge hangs from the right of the bottom row. | ||
| CAC5 | LD DE,$CBAB | The attribute area of the gauge. | ||
| CAC8 | JP FillAttributes | Fill that area. | ||
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