Routines
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D38C: Find Door Height
Used by the routine at PlacePlayerAtDoor.
Looks through the first four pairs of objects of the room for an arch (a graphic number below 06) whose X and Y coordinates add up to a given number. When it finds one it gives the player the height of the arch.
Input
C Sum of the X and Y coordinates of the arch
IX Address of the player
Find the matching arch and copy its height to the player.
FindDoorHeight D38C LD IY,$5C88 Point IY at the first object of the room, ObjectsTable_RoomObjects.
D390 LD DE,$0040 Set the distance between pairs of objects to 40.
D393 LD B,$04 Set the number of pairs to 04.
FindDoorHeight_Next D395 LD A,(IY+$00) Fetch the graphic number of the object.
D398 CP $06 Compare it with 06.
D39A RET NC Return if it is not an arch.
D39B LD A,(IY+$01) Add the Y coordinate to the X coordinate.
D39E ADD A,(IY+$02)
D3A1 CP C Compare the sum with the one that is wanted.
D3A2 JR Z,FindDoorHeight_Found Jump to FindDoorHeight_Found if it matches.
D3A4 ADD IY,DE Point IY at the next pair.
D3A6 DJNZ FindDoorHeight_Next Jump to FindDoorHeight_Next until all of the pairs have been tried.
D3A8 RET Return.
FindDoorHeight_Found D3A9 LD A,(IY+$03) Fetch the Z coordinate of the arch.
D3AC LD (IX+$03),A Set the Z coordinate of the legs of the player.
D3AF ADD A,$0C Add 0C to it.
D3B1 LD (IX+$23),A Set the Z coordinate of the top half of the player.
D3B4 RET Return.
View the equivalent code in;
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