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Routines |
| Prev: AA5B | Up: Map | Next: AAE2 |
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Used by the routines at ShowTitleMenu, CollectBottle, FollowPath, RunGame, DrawPanel, DrawFrameCorners and DrawGaugeBar.
Draws a picture on the screen. A picture starts with its width in bytes and its height in pixel lines, and is followed by the bytes of each line with the bottom line first.
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| DrawPicture | AAC4 | PUSH HL | Save the position. | ||||||||
| AAC5 | CALL GetScreenAddress | Convert the position into a screen address. | |||||||||
| AAC8 | LD A,(DE) | Fetch the width of the picture. | |||||||||
| AAC9 | LD ($AAD2),A | Store it in the operand of the instruction at AAD1. | |||||||||
| AACC | INC DE | Move onto the height. | |||||||||
| AACD | LD A,(DE) | Fetch it. | |||||||||
| AACE | INC DE | Move onto the first byte of the picture. | |||||||||
| AACF | LD C,A | Keep the height in C. | |||||||||
| DrawPicture_Line | AAD0 | PUSH HL | Save the screen address of the start of the line. | ||||||||
| AAD1 | LD B,$00 | Set the width in bytes (this is patched at AAD2). | |||||||||
| DrawPicture_Byte | AAD3 | LD A,(DE) | Fetch a byte of the picture. | ||||||||
| AAD4 | LD (HL),A | Write it to the screen. | |||||||||
| AAD5 | INC DE | Move onto the next byte of the picture. | |||||||||
| AAD6 | INC L | Move onto the next byte of the screen. | |||||||||
| AAD7 | DJNZ DrawPicture_Byte | Jump back until the line has been drawn. | |||||||||
| AAD9 | POP HL | Restore the screen address of the start of the line. | |||||||||
| AADA | CALL MoveUpALine | Move up a pixel line. | |||||||||
| AADD | DEC C | Decrease the height by one. | |||||||||
| AADE | JR NZ,DrawPicture_Line | Jump back until all of the lines have been drawn. | |||||||||
| AAE0 | POP HL | Restore the position. | |||||||||
| AAE1 | RET | Return. | |||||||||
| Prev: AA5B | Up: Map | Next: AAE2 |
