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Routines |
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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 | 43716 | PUSH HL | Save the position. | ||||||||
| 43717 | CALL GetScreenAddress | Convert the position into a screen address. | |||||||||
| 43720 | LD A,(DE) | Fetch the width of the picture. | |||||||||
| 43721 | LD (43730),A | Store it in the operand of the instruction at 43729. | |||||||||
| 43724 | INC DE | Move onto the height. | |||||||||
| 43725 | LD A,(DE) | Fetch it. | |||||||||
| 43726 | INC DE | Move onto the first byte of the picture. | |||||||||
| 43727 | LD C,A | Keep the height in C. | |||||||||
| DrawPicture_Line | 43728 | PUSH HL | Save the screen address of the start of the line. | ||||||||
| 43729 | LD B,0 | Set the width in bytes (this is patched at 43730). | |||||||||
| DrawPicture_Byte | 43731 | LD A,(DE) | Fetch a byte of the picture. | ||||||||
| 43732 | LD (HL),A | Write it to the screen. | |||||||||
| 43733 | INC DE | Move onto the next byte of the picture. | |||||||||
| 43734 | INC L | Move onto the next byte of the screen. | |||||||||
| 43735 | DJNZ DrawPicture_Byte | Jump back until the line has been drawn. | |||||||||
| 43737 | POP HL | Restore the screen address of the start of the line. | |||||||||
| 43738 | CALL MoveUpALine | Move up a pixel line. | |||||||||
| 43741 | DEC C | Decrease the height by one. | |||||||||
| 43742 | JR NZ,DrawPicture_Line | Jump back until all of the lines have been drawn. | |||||||||
| 43744 | POP HL | Restore the position. | |||||||||
| 43745 | RET | Return. | |||||||||
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