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Routines |
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This routine is only called when the Storm Cloud and Magic Knight are both in the same room.
If the do-not-draw-storm-cloud flag is set, then the display file address at which to draw the Storm Cloud is calculated, and the correct frame in the Storm Cloud graphic data at 25176 is determined. After this, the flag is reset, ensuring that the Storm Cloud can redrawn at its new position by the routine at 64687.
Used by the routine at 40008.
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| 64637 | LD A,(64688) | If do-not-draw-storm-cloud flag is reset... | ||
| 64640 | OR A | ... | ||
| 64641 | RET Z | ...then return | ||
| 64642 | LD A,(23701) | Load BC with Storm Cloud's apparent x-coordinate (characters)... | ||
| 64645 | RRCA | ... | ||
| 64646 | RRCA | ... | ||
| 64647 | RRCA | ... | ||
| 64648 | AND 31 | ... | ||
| 64650 | LD C,A | ... | ||
| 64651 | LD B,0 | ... | ||
| 64653 | LD HL,16544 | Load HL with display file address for top pixel row of cell at character coordinates (0, 5) | ||
| 64656 | ADD HL,BC | Add BC to HL as offset... | ||
| 64657 | LD (64704),HL | ...and store at 64704 | ||
| 64660 | LD A,(23701) | Load HL with Storm Cloud's apparent x-coordinate (pixel-within-character)... | ||
| 64663 | AND 7 | ... | ||
| 64665 | ADD A,A | ...multiplied by 128... | ||
| 64666 | ADD A,A | ...as each Storm Cloud frame graphic is 128 bytes long... | ||
| 64667 | ADD A,A | ... | ||
| 64668 | ADD A,A | ... | ||
| 64669 | LD L,A | ... | ||
| 64670 | LD H,0 | ... | ||
| 64672 | ADD HL,HL | ... | ||
| 64673 | ADD HL,HL | ... | ||
| 64674 | ADD HL,HL | ... | ||
| 64675 | LD BC,25176 | Load BC with start address of Storm Cloud graphic data... | ||
| 64678 | ADD HL,BC | ...and add HL as offset in HL to give address of required frame's graphic data | ||
| 64679 | LD (64708),HL | Store graphic's start address at 64708 | ||
| 64682 | XOR A | Reset do-not-draw-storm-cloud flag... | ||
| 64683 | LD (64688),A | ... | ||
| 64686 | RET | Return | ||
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