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Routines |
Prev: 31739 | Up: Map | Next: 31807 |
Continues from 31648. Moves the character looking for ERIC to the midstride position in the appropriate direction. The main entry point is used when the character is on a staircase.
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31768 | INC B | B=1 | ||||||||||
31769 | DEC A | Is the chaser going downstairs? | ||||||||||
31770 | JR NZ,31774 | Jump if so | ||||||||||
31772 | DEC B | B=0 | ||||||||||
31773 | DEC D | D=-1 | ||||||||||
31774 | INC C | C=1 | ||||||||||
31775 | BIT 7,(HL) | Is the chaser facing right? | ||||||||||
31777 | JR NZ,31781 | Jump if so | ||||||||||
31779 | DEC C | C=-1 | ||||||||||
31780 | DEC C | |||||||||||
This entry point is used by the routine at 31648 when the character looking for ERIC is not on a staircase; in this case B=D=E=0, and C=-1 if the chaser is to ERIC's left, or 1 if he is to ERIC's right.
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31781 | LD L,107 | C=-1 if the chaser is to ERIC's left, or 1 if to his right; B=1 if the chaser is going downstairs, 0 otherwise; place these values into bytes 107 and 108 of of the chaser's buffer | ||||||||||
31783 | LD (HL),C | |||||||||||
31784 | INC L | |||||||||||
31785 | LD (HL),B | |||||||||||
31786 | LD L,105 | Change the interruptible subcommand routine address in bytes 105 and 106 of the chaser's buffer from 31648 to 31739 | ||||||||||
31788 | LD (HL),251 | |||||||||||
31790 | PUSH DE | Save the x- and y-coordinate increments for the chaser's next move | ||||||||||
31791 | CALL 25108 | Update the SRB for the chaser's current location | ||||||||||
31794 | INC A | A=chaser's next animatory state (midstride) | ||||||||||
31795 | LD L,A | Store this in L briefly | ||||||||||
31796 | POP BC | Get the appropriate y- and x-coordinate increments for the chaser's move to the midstride position in BC | ||||||||||
31797 | LD A,B | Get the chaser's new y-coordinate in D (which is the same as his current y-coordinate unless he's going up a staircase) | ||||||||||
31798 | ADD A,D | |||||||||||
31799 | LD D,A | |||||||||||
31800 | LD A,C | Get the chaser's new x-coordinate in E (which is the the same as his current x-coordinate, because C is always 0) | ||||||||||
31801 | ADD A,E | |||||||||||
31802 | LD E,A | |||||||||||
31803 | LD A,L | Restore the chaser's new animatory state to A | ||||||||||
31804 | JP 25008 | Update the chaser's animatory state and location and update the SRB |
Prev: 31739 | Up: Map | Next: 31807 |