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B4E8: Move a character one step along the catwalk
Used by the routine at B5E8.
H 0x98 (boy) or 0xA4 (teacher)
B4E8 CALL $6214 Update the SRB for the character's current location
B4EB INC A A=character's next animatory state
B4EC LD C,A Store this in C
B4ED RRCA Set the carry flag if this animatory state is midstride
B4EE LD A,C Restore the next animatory state to A
B4EF JR C,$B4F9 Jump if the character will be midstride
The character will be moving from the midstride position, so move him one space forward.
B4F1 INC E Increment the character's x-coordinate
B4F2 AND $03 Keep only the walking phase identifier bits of the animatory state (bits 0-1)
B4F4 LD A,C Restore the next animatory state to A again
B4F5 JR NZ,$B4F9 Jump if the next animatory state is standing/walking phase 3
B4F7 SUB $04 Reset the animatory state to standing/walking phase 1
Now A holds the character's new animatory state, and E his x-coordinate.
B4F9 CALL $61B0 Update the character's animatory state and location and update the SRB
B4FC JP $6992 Update the display
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