Routines
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51121: Nudge Object East West
Sets the adjustment of the speed in Y of an object, to bring it a step closer to the middle line of an arch that goes east and west.
Input
IX Address of the arch object
IY Address of the object
Step the object towards the east-west middle line.
NudgeObjectEastWest 51121 LD A,(IX+10) Fetch the Y coordinate of the middle of the doorway.
51124 CP (IY+2) Compare it with the Y coordinate of the object.
51127 JR Z,NudgeObjectsToArch_Restore Jump to NudgeObjectsToArch_Restore if the object is in the middle.
51129 LD A,1 Set the adjustment to 1.
51131 JR NC,NudgeObjectEastWest_Set Jump to NudgeObjectEastWest_Set if the object is south of the middle.
51133 NEG Make the adjustment negative.
NudgeObjectEastWest_Set 51135 LD (IY+15),A Set the adjustment of the speed in Y of the object.
51138 JR NudgeObjectsToArch_Restore Jump to NudgeObjectsToArch_Restore.
View the equivalent code in;
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