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Routines |
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Used by the routine at ResolveFullOverlap.
The other item must be drawn before this one, so it becomes the item under consideration. The addresses of the entries in the draw list which have been tried are kept in a list at TriedEntries, and if the other item is already in that list then there is a loop and the other item is moved to the sorted list now.
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| DrawOtherItemFirst | A0FA | LD HL,($A1B0) | Fetch the address of the entry after the other item. | |
| A0FD | DEC HL | Move back to the start of the item... | ||
| A0FE | DEC HL | ...in the draw list... | ||
| A0FF | DEC HL | ...which is three bytes. | ||
| A100 | LD DE,$A19E | Point DE at TriedEntries. | ||
| DrawOtherItemFirst_Search | A103 | LD A,(DE) | Fetch the first byte of the next address in the list. | |
| A104 | CP $FF | Jump to DrawOtherItemFirst_Add if this is the end of the list. | ||
| A106 | JR Z,DrawOtherItemFirst_Add | |||
| A108 | CP H | Compare it with the first byte of the address of the other item. | ||
| A109 | INC DE | Move onto the second byte. | ||
| A10A | JR NZ,DrawOtherItemFirst_Different | Jump to DrawOtherItemFirst_Different if they are different. | ||
| A10C | LD A,(DE) | Fetch the second byte. | ||
| A10D | CP L | Compare it with the second byte of the address of the other item. | ||
| A10E | JR Z,DrawOtherItemFirst_Loop | Jump to DrawOtherItemFirst_Loop if the item is in the list. | ||
| DrawOtherItemFirst_Different | A110 | INC DE | Move onto the next address in the list. | |
| A111 | JR DrawOtherItemFirst_Search | Jump back to compare it. | ||
| A113 | DEC DE | This instruction is never executed. | ||
| DrawOtherItemFirst_Add | A114 | LD A,H | Store the first byte of the address of the other item at the end of the list. | |
| A115 | LD (DE),A | Move onto the second byte. | ||
| A116 | INC DE | |||
| A117 | LD A,L | Fetch the second byte of the address of the other item. | ||
| A118 | LD (DE),A | Store it in the list. | ||
| A119 | INC DE | Move onto the end marker. | ||
| A11A | LD A,$FF | Set the end marker to FF. | ||
| A11C | LD (DE),A | Store it. | ||
| A11D | PUSH IY | Copy the address of the other record into IX (using the stack). | ||
| A11F | POP IX | |||
| A121 | LD HL,($A1B0) | Fetch the address of the item after the other item. | ||
| A124 | LD ($A1AE),HL | Make it the item under consideration. | ||
| A127 | LD DE,$AFFB | Point DE at DrawList. | ||
| A12A | DEC HL | Move back to the start of the item... | ||
| A12B | DEC HL | ...in the draw list... | ||
| A12C | DEC HL | ...which is three bytes. | ||
| A12D | BIT 0,(HL) | Jump to SortDrawList_SecondLoop if the record is an entity. | ||
| A12F | JP NZ,SortDrawList_SecondLoop | |||
| A132 | PUSH IY | Copy the address of the second scratch item into HL (using the stack). | ||
| A134 | POP HL | |||
| A135 | LD DE,$9F79 | Point DE at ScratchItems. | ||
| A138 | LDI | Copy the first byte of the second scratch item to the first scratch item. | ||
| A13A | LDI | Copy the second byte. | ||
| A13C | LDI | Copy the third byte. | ||
| A13E | LDI | Copy the fourth byte. | ||
| A140 | LDI | Copy the fifth byte. | ||
| A142 | LDI | Copy the sixth byte. | ||
| A144 | LDI | Copy the seventh byte. | ||
| A146 | LDI | Copy the eighth byte. | ||
| A148 | LDI | Copy the ninth byte. | ||
| A14A | LDI | Copy the tenth byte. | ||
| A14C | LD IX,$9F79 | Point IX at ScratchItems. | ||
| A150 | LD DE,$AFFB | Point DE at DrawList. | ||
| A153 | JP SortDrawList_SecondLoop | Jump to SortDrawList_SecondLoop. | ||
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There is a loop, so move the other item to the sorted list now.
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| DrawOtherItemFirst_Loop | A156 | LD HL,($A1B0) | Fetch the address of the item after the other item. | |
| A159 | LD ($A1AE),HL | Make it the item under consideration. | ||
| A15C | JR MoveItemToSortedList | Jump to MoveItemToSortedList to move it to the sorted list. | ||
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