Routines
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49232: Nudge Player East West
Sets the adjustment to the speed of the player along the y axis, to bring the player a step closer to the middle line of an arch that goes east and west. Nothing is done if the sprite of the player is flipped.
Input
IX The address of the arch object
IY The address of the player
Skip if flipped or already in the middle.
NudgePlayerEastWest 49232 BIT 6,(IY+7) Jump to NudgePlayerNorthSouth_Done if the player is flipped.
49236 JR NZ,NudgePlayerNorthSouth_Done
49238 LD A,(IX+10) Fetch the y of the doorway middle.
49241 CP (IY+2) Jump to NudgePlayerNorthSouth_Done if the player is in the middle.
49244 JR Z,NudgePlayerNorthSouth_Done
Step toward the middle along y.
49246 LD A,1 Set A to 1.
49248 JR NC,NudgePlayerEastWest_Set Jump to NudgePlayerEastWest_Set if carry is not set.
49250 NEG Negate A.
NudgePlayerEastWest_Set 49252 LD (IY+15),A Set the y-speed adjustment of the player.
49255 JR NudgePlayerNorthSouth_Done Jump to NudgePlayerNorthSouth_Done.
View the equivalent code in;
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