Routines
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D17D: Convert Cell
Used by the routines at DrawView and FindObjectsInCell.
Converts the column and the row of a cell between the map and the view, which are the same unless the view is rotated, when both are turned around.
Input
H Row
L Column
Output
H Row converted
L Column converted
ConvertCell D17D LD A,($BBBA) Return if the view is not turned round.
D180 AND $01
D182 RET Z
D183 LD A,L Turn the column round by subtracting it from 1F.
D184 CPL
D185 AND $1F
D187 LD L,A
D188 LD A,H Turn the row round by subtracting it from 1F.
D189 CPL
D18A AND $1F
D18C LD H,A
D18D RET Return.
View the equivalent code in;
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