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Routines |
Prev: 36593 | Up: Map |
Used by the routine at 34574.
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36707 | XOR A | Initialise the attribute of the last item drawn at 32884 to 0 (in case there are no items left to draw) | |||||
36708 | LD (32884),A | ||||||
36711 | LD IY,32885 | Point IY at the first byte of the first item definition at 32885 | |||||
The item-drawing loop begins here.
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36715 | LD A,(IY+0) | Pick up the first byte of the item definition | |||||
36718 | CP 255 | Have we dealt with all the items yet? | |||||
36720 | JR Z,36794 | Jump if so | |||||
36722 | OR A | Has this item already been collected? | |||||
36723 | JR Z,36782 | If so, skip it and consider the next one | |||||
36725 | LD E,(IY+1) | Point DE at the address of the item's location in the attribute buffer at 23552 | |||||
36728 | LD D,(IY+2) | ||||||
36731 | LD A,(DE) | Pick up the current attribute byte at the item's location | |||||
36732 | AND 7 | Is the INK white (which happens if Willy is touching the item)? | |||||
36734 | CP 7 | ||||||
36736 | JR NZ,36750 | Jump if not | |||||
Willy is touching this item, so add it to his collection.
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36738 | LD HL,33836 | Add 100 to the score | |||||
36741 | CALL 37118 | ||||||
36744 | LD (IY+0),0 | Set the item's attribute byte to 0 so that it will be skipped the next time | |||||
36748 | JR 36782 | Jump forward to consider the next item | |||||
This item has not been collected yet.
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36750 | LD A,(IY+0) | Pick up the item's current attribute byte | |||||
36753 | AND 248 | Keep the BRIGHT and PAPER bits, and set the INK to 3 (magenta) | |||||
36755 | OR 3 | ||||||
36757 | LD B,A | Store this value in B | |||||
36758 | LD A,(IY+0) | Pick up the item's current attribute byte again | |||||
36761 | AND 3 | Keep only bits 0 and 1 and add the value in B; this maintains the BRIGHT and PAPER bits, and cycles the INK colour through 3, 4, 5 and 6 | |||||
36763 | ADD A,B | ||||||
36764 | LD (IY+0),A | Store the new attribute byte | |||||
36767 | LD (DE),A | Update the attribute byte at the item's location in the buffer at 23552 | |||||
36768 | LD (32884),A | Store the new attribute byte at 32884 as well | |||||
36771 | LD D,(IY+3) | Point DE at the address of the item's location in the screen buffer at 24576 | |||||
36774 | LD HL,32948 | Point HL at the item graphic for the current cavern (at 32948) | |||||
36777 | LD B,8 | There are eight pixel rows to copy | |||||
36779 | CALL 37589 | Draw the item to the screen buffer at 24576 | |||||
The current item definition has been dealt with. Time for the next one.
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36782 | INC IY | Point IY at the first byte of the next item definition | |||||
36784 | INC IY | ||||||
36786 | INC IY | ||||||
36788 | INC IY | ||||||
36790 | INC IY | ||||||
36792 | JR 36715 | Jump back to deal with the next item | |||||
All the items have been dealt with. Check whether there were any left.
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36794 | LD A,(32884) | Pick up the attribute of the last item drawn at 32884 | |||||
36797 | OR A | Were any items drawn? | |||||
36798 | RET NZ | Return if so (some remain to be collected) | |||||
36799 | LD HL,32911 | Ensure that the portal is flashing by setting bit 7 of its attribute byte at 32911 | |||||
36802 | SET 7,(HL) | ||||||
36804 | RET |
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