Routines
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6D7D: Check for main kids near a teacher
Used by the routine at 7596. Returns with the character number of the nearest main kid (or 0 if none of them was close enough) in A.
Input
H Teacher's character number (0xC8-0xCC)
6D7D CALL \$6CEE Get the lower and upper x-coordinates of the teacher's range of vision in C and B
6D80 LD L,\$00 Default assumption: no kids nearby
6D82 EXX
6D83 LD H,\$CE 0xCE=BOY WANDER
6D85 LD BC,\$05FF B'=5 (main kids including ERIC), C'=255 (initial value for the distance of the nearest main kid)
6D88 EXX
6D89 CALL \$6D32 Find the first main kid within range (if any)
6D8C AND A Set the zero flag if we've checked all the main kids
6D8D LD A,L A=character number of the nearest kid so far, or 0 if there are none
6D8E RET Z Return if we've finished checking all the main kids
6D8F LD A,E A=teacher's x-coordinate
6D90 EXX
6D91 SUB E Subtract the x-coordinate of the kid
6D92 JR NC,\$6D96 Jump if the kid's to the left of teacher
6D94 NEG
6D96 CP C Is this kid closer to the teacher than the last?
6D97 JR NC,\$6D9E Jump if not
6D99 LD C,A C'=distance from the teacher of the nearest kid found so far
6D9A LD A,H A=character number of this kid
6D9B EXX
6D9C LD L,A Store the character number of the nearest kid in L
6D9D EXX
6D9E CALL \$6D4D Find the next main kid within range (if any)
6DA1 JR \$6D8C Jump back to compare distances
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