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Routines |
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Used by the routine at DrawWallStrips.
Sets the attributes of a column of AttributeBuffer from the strip to the bottom of the view. The colour is bright green, cyan, yellow or white, from the lowest two bits of WallTile.
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Return unless the strip is in the view.
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| ColourWallColumn | 54102 | LD A,D | Return if it is below the bottom of the view. | |||||||
| 54103 | SUB 191 | |||||||||
| 54105 | RET NC | |||||||||
| 54106 | NEG | Make the number of pixel rows to the bottom. | ||||||||
| 54108 | SRL A | Divide it by eight. | ||||||||
| 54110 | SRL A | |||||||||
| 54112 | SRL A | |||||||||
| 54114 | RET Z | Return if there are none. | ||||||||
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Colour the column.
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| 54115 | LD B,A | Set the number of character rows. | ||||||||
| 54116 | EX DE,HL | Put the position in HL. | ||||||||
| 54117 | CALL CalculateAttributeAddress | Call CalculateAttributeAddress. | ||||||||
| 54120 | LD A,(48064) | Fetch WallTile. | ||||||||
| 54123 | AND %00000011 | Keep the lowest two bits. | ||||||||
| 54125 | OR %01000100 | Make the colour bright green, cyan, yellow or white. | ||||||||
| 54127 | JP ColourAttributeColumn | Jump to ColourAttributeColumn. | ||||||||
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