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Routines |
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Used by the routine at DrawTerrain.
Moves on to the next segment of the script, using the address that ReadSegmentShapes stored in ScriptPointer, until the last has been drawn. Then the next tile is started: the vertical offset (and for the third tile the horizontal offset) is changed to move to the position of that tile. After the fourth tile the horizontal offset is put back.
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| NextSegment | D80A | LD SP,$5B7A | Set the stack pointer to 5B7A. | |
| D80D | LD HL,($CE4D) | Fetch the word at ScriptPointer into HL. | ||
| D810 | LD A,($5C20) | The segments still to draw. | ||
| D813 | DEC A | Step A back. | ||
| D814 | LD ($5C20),A | Update the segments still to draw. | ||
| D817 | JP NZ,DrawTerrain_Segment | Jump to DrawTerrain_Segment if the zero flag is clear. | ||
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This entry point is used by the routine at DrawTerrain.
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| NextSegment_Tile | D81A | LD A,($5C1D) | The tile number. | |
| D81D | INC A | Advance A. | ||
| D81E | LD ($5C1D),A | Update the tile number. | ||
| D821 | CP $04 | Jump to NextSegment_Done if A is 04. | ||
| D823 | JR Z,NextSegment_Done | |||
| D825 | BIT 0,A | Test bit 0 of A. | ||
| D827 | LD B,$60 | B=60. | ||
| D829 | JR Z,NextSegment_Offset | Jump to NextSegment_Offset if the zero flag is set. | ||
| D82B | LD B,$A0 | B=A0. | ||
| NextSegment_Offset | D82D | LD A,($CE42) | The vertical offset. | |
| D830 | ADD A,B | A gains B. | ||
| D831 | LD ($CE42),A | Update the vertical offset. | ||
| D834 | LD A,($5C1D) | The tile number. | ||
| D837 | CP $02 | Jump to DrawTerrain_Record if A is not 02. | ||
| D839 | JP NZ,DrawTerrain_Record | |||
| D83C | LD B,$20 | B=20. | ||
| D83E | LD A,($CE41) | The horizontal offset. | ||
| D841 | SUB B | Subtract B from A. | ||
| D842 | LD ($CE41),A | Update the horizontal offset. | ||
| D845 | JP DrawTerrain_Record | Jump to DrawTerrain_Record. | ||
| NextSegment_Done | D848 | LD A,($CE41) | The horizontal offset. | |
| D84B | ADD A,$20 | Add 20 to A. | ||
| D84D | LD ($CE41),A | Update the horizontal offset. | ||
| D850 | RET | Return. | ||
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