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Routines |
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If the do-not-draw-storm-cloud flag is reset, then the Storm Cloud will be drawn. After this, the flag is set, ensuring that the position of the Storm Cloud can be updated by the routine at 64637. This also ensures that if Magic Knight moves to a different room, the drawing of the Storm Cloud will cease, since the do-not-draw-storm-cloud flag is only reset by the routine at 64637, which in turn is only called when both the Storm Cloud and Magic Knight are in the same room.
Used by the routine at 62178.
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The operand of the instruction at 64687 represents the do-not-draw-storm-cloud flag. This is modified by the instructions at 38134, 64683 and 64806.
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| 64687 | LD A,1 | If do-not-draw-storm-cloud flag is set... | ||
| 64689 | OR A | ... | ||
| 64690 | RET NZ | ...then return | ||
| 64691 | LD HL,(23677) | Store value in coordinate storage on stack... | ||
| 64694 | PUSH HL | ... | ||
| 64695 | LD HL,(63018) | Load HL with address of bitmap virtual text cursor | ||
| 64698 | PUSH HL | Store HL (bitmap virtual cursor address) | ||
| 64699 | LD HL,(23707) | Load HL with address of attribute virtual text cursor | ||
| 64702 | PUSH HL | Store HL (attribute virtual cursor address) | ||
| 64703 | LD HL,0 | Load HL with current display file address of Storm Cloud | ||
| 64706 | PUSH HL | Store HL (current display file address of Storm Cloud) | ||
| 64707 | LD DE,0 | Load DE with start address of graphic data for Storm Cloud's current frame | ||
| 64710 | LD B,8 | Load B with 8 (as we are drawing the first eight pixel rows of cloud graphic data) | ||
| 64712 | PUSH HL | Store HL (current display file address at left side of cloud) | ||
| 64713 | LD A,(DE) | Copy a run of eight bytes from Storm Cloud's graphic data... | ||
| 64714 | LD (HL),A | ...to display file, starting at current display file address... | ||
| 64715 | INC HL | ... | ||
| 64716 | INC DE | ... | ||
| 64717 | LD A,(DE) | ... | ||
| 64718 | LD (HL),A | ... | ||
| 64719 | INC HL | ... | ||
| 64720 | INC DE | ... | ||
| 64721 | LD A,(DE) | ... | ||
| 64722 | LD (HL),A | ... | ||
| 64723 | INC HL | ... | ||
| 64724 | INC DE | ... | ||
| 64725 | LD A,(DE) | ... | ||
| 64726 | LD (HL),A | ... | ||
| 64727 | INC HL | ... | ||
| 64728 | INC DE | ... | ||
| 64729 | LD A,(DE) | ... | ||
| 64730 | LD (HL),A | ... | ||
| 64731 | INC HL | ... | ||
| 64732 | INC DE | ... | ||
| 64733 | LD A,(DE) | ... | ||
| 64734 | LD (HL),A | ... | ||
| 64735 | INC HL | ... | ||
| 64736 | INC DE | ... | ||
| 64737 | LD A,(DE) | ... | ||
| 64738 | LD (HL),A | ... | ||
| 64739 | INC HL | ... | ||
| 64740 | INC DE | ... | ||
| 64741 | LD A,(DE) | ... | ||
| 64742 | LD (HL),A | ... | ||
| 64743 | INC DE | Advance DE to next byte in graphic data (i.e. start of next pixel row) | ||
| 64744 | POP HL | Restore HL (current display file address at left side of cloud) | ||
| 64745 | INC H | Advance down a pixel row | ||
| 64746 | DJNZ 64712 | Decrease remaining number of pixel rows to draw, and loop back to 64712 if not zero | ||
| 64748 | POP HL | Restore HL (current display file address of Storm Cloud) | ||
| 64749 | LD A,32 | Add 32 to display file address to move down eight pixels... | ||
| 64751 | ADD A,L | ... | ||
| 64752 | LD L,A | ... | ||
| 64753 | XOR A | Set A to zero (see trivia) | ||
| 64754 | LD B,5 | Load B with 5 (as we are drawing a further five pixel rows of cloud graphic data) | ||
| 64756 | PUSH HL | Store HL (current display file address at left side of cloud) | ||
| 64757 | LD A,(DE) | Copy a run of eight bytes from Storm Cloud's graphic data... | ||
| 64758 | LD (HL),A | ...to display file, starting at current display file address... | ||
| 64759 | INC HL | ... | ||
| 64760 | INC DE | ... | ||
| 64761 | LD A,(DE) | ... | ||
| 64762 | LD (HL),A | ... | ||
| 64763 | INC HL | ... | ||
| 64764 | INC DE | ... | ||
| 64765 | LD A,(DE) | ... | ||
| 64766 | LD (HL),A | ... | ||
| 64767 | INC HL | ... | ||
| 64768 | INC DE | ... | ||
| 64769 | LD A,(DE) | ... | ||
| 64770 | LD (HL),A | ... | ||
| 64771 | INC HL | ... | ||
| 64772 | INC DE | ... | ||
| 64773 | LD A,(DE) | ... | ||
| 64774 | LD (HL),A | ... | ||
| 64775 | INC HL | ... | ||
| 64776 | INC DE | ... | ||
| 64777 | LD A,(DE) | ... | ||
| 64778 | LD (HL),A | ... | ||
| 64779 | INC HL | ... | ||
| 64780 | INC DE | ... | ||
| 64781 | LD A,(DE) | ... | ||
| 64782 | LD (HL),A | ... | ||
| 64783 | INC HL | ... | ||
| 64784 | INC DE | ... | ||
| 64785 | LD A,(DE) | ... | ||
| 64786 | LD (HL),A | ... | ||
| 64787 | INC DE | ... | ||
| 64788 | POP HL | Restore HL (current display file address at left side of cloud) | ||
| 64789 | INC H | Advance down a pixel row | ||
| 64790 | DJNZ 64756 | Decrease remaining number of pixel rows to draw, and loop back to 64756 if not zero | ||
| 64792 | POP HL | Restore HL (attribute virtual cursor address) | ||
| 64793 | LD (23707),HL | Restore attribute virtual cursor address | ||
| 64796 | POP HL | Restore HL (bitmap virtual cursor address) | ||
| 64797 | LD (63018),HL | Restore bitmap virtual cursor address | ||
| 64800 | POP HL | Restore value in coordinate storage from stack... | ||
| 64801 | LD (23677),HL | ... | ||
| 64804 | LD A,1 | Set do-not-draw-storm-cloud flag... | ||
| 64806 | LD (64688),A | ... | ||
| 64809 | RET | Return | ||
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