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Routines |
H | Character number of teacher (200-204) |
25944 | LD L,0 | Point HL at byte 0 of the character's buffer |
25946 | BIT 0,(HL) | Is the teacher midstride? |
25948 | JR Z,25963 | Jump if not |
25950 | CALL 25012 | Update SRB for the teacher's current animatory state and location |
25953 | LD B,A | Save the animatory state in B temporarily |
25954 | LD L,15 | Byte 15 holds the y-coordinate adjustment to make as the teacher finishes this stride: 0 normally, 1 if descending a staircase (see later in this routine) |
25956 | LD A,(HL) | |
25957 | ADD A,D | Make the appropriate y-coordinate adjustment |
25958 | LD D,A | |
25959 | LD A,B | Restore the animatory state to A |
25960 | JP 25600 | Make the teacher finish his stride |
25963 | CALL 28242 | Is the teacher on a staircase? |
25966 | JR C,26007 | Jump if so |
25968 | LD DE,(53761) | Pick up ERIC's coordinates in DE |
25972 | LD L,0 | Byte 0 holds the teacher's animatory state |
25974 | BIT 7,(HL) | Is the teacher facing left? |
25976 | LD L,1 | |
25978 | JR Z,25984 | Jump if so |
25980 | LD A,E | A=ERIC's x-coordinate |
25981 | SUB (HL) | Subtract that of the teacher |
25982 | JR 25986 | |
25984 | LD A,(HL) | A=teacher's x-coordinate |
25985 | SUB E | Subtract that of ERIC |
25986 | CP 4 | Is ERIC less than 4 horizontal spaces in front of the teacher? |
25988 | JR NC,26004 | Jump if not |
25990 | INC L | L=2 |
25991 | LD A,(HL) | A=teacher's y-coordinate |
25992 | SUB 4 | |
25994 | JR C,25999 | Jump if the teacher's on the top floor |
25996 | CP D | IS ERIC at least 4 vertical spaces above the teacher? |
25997 | JR NC,26004 | Jump if so |
25999 | ADD A,7 | Set the carry flag if ERIC is at least 4 vertical spaces below the teacher |
26001 | CP D | |
26002 | CCF | Return if ERIC is within 3 vertical spaces either side of the teacher |
26003 | RET C |
26004 | CALL 25534 | D=ERIC's y-coordinate (or the y-coordinate of the floor he's closest to if his feet are not on the floor) |
26007 | CALL 25843 | Work out how the teacher can reach ERIC from here |
26010 | BIT 3,A | Is there a closed door in the way? |
26012 | JP NZ,28834 | Open it if so |
26015 | LD BC,0 | Initialise the staircase indicator to 0 |
26018 | CP 2 | Is the teacher descending a staircase? |
26020 | JR NZ,26023 | Jump if not |
26022 | INC B | B=1 (teacher is descending a staircase) |
26023 | JR NC,26026 | Jump if the teacher is not ascending a staircase |
26025 | DEC C | C=-1 (teacher is ascending a staircase) |
26026 | CP 3 | Is the teacher on a staircase? |
26028 | JR C,26045 | Jump if so |
26030 | LD L,0 | Byte 0 holds the teacher's animatory state |
26032 | CP 4 | Set the carry flag if the teacher should go left |
26034 | BIT 7,(HL) | Set the zero flag if the teacher is facing left |
26036 | JR C,26043 | Jump if the teacher must go left to reach ERIC |
26038 | JR NZ,26045 | Jump if the teacher is facing right |
26040 | JP 25648 | Turn the teacher round |
26043 | JR NZ,26040 | Turn the teacher round if he's facing right |
26045 | LD L,15 | Set byte 15 of teacher's buffer to 1 if the teacher is descending a staircase, or 0 if he's ascending a staircase or not on one |
26047 | LD (HL),B | |
26048 | PUSH BC | |
26049 | CALL 25012 | Update SRB for the teacher's current animatory state and location |
26052 | POP BC | |
26053 | BIT 0,C | Is the teacher ascending a staircase? |
26055 | JR Z,26058 | Jump if not |
26057 | DEC D | Up a stair as the teacher goes midstride |
26058 | INC A | One foot forward (midstride) |
26059 | JP 24880 | Update SRB for the teacher's new animatory state and location |