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Routines |
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Used by the routine at TestBoxesOverlap.
Tests whether two boxes overlap vertically. The result is stored in 5C1C.
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| TestVerticalOverlap | 9DD8 | XOR A | Clear the result. | |||||||||
| 9DD9 | LD ($5C1C),A | Store it. | ||||||||||
| 9DDC | LD A,(IX+$01) | Fetch the top of the first box. | ||||||||||
| 9DDF | SUB H | Subtract the position of the second box. | ||||||||||
| 9DE0 | CP (IX+$03) | Is it less than the height of the first box? | ||||||||||
| 9DE3 | JR C,SetOverlapFlag | Jump to SetOverlapFlag if so. | ||||||||||
| 9DE5 | LD A,H | Fetch the position of the second box. | ||||||||||
| 9DE6 | SUB (IX+$01) | Subtract the top of the first box. | ||||||||||
| 9DE9 | CP E | Is it less than the height of the second box? | ||||||||||
| 9DEA | RET NC | Return if not, as the boxes do not overlap. | ||||||||||
| 9DEB | JP SetOverlapFlag | Jump to SetOverlapFlag. | ||||||||||
| Prev: 9DBB | Up: Map | Next: 9DEE |