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Routines |
Prev: 28736 | Up: Map | Next: 28812 |
Used by the routines at 25843 and 28814. Returns with the carry flag set if the character is facing a closed door, and C holding the door identifier:
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28767 | LD L,0 | Pick up the character's animatory state in A | ||||||||||||||
28769 | LD A,(HL) | |||||||||||||||
28770 | RLCA | Set A=-1 if the character is facing left, 1 if facing right | ||||||||||||||
28771 | CCF | |||||||||||||||
28772 | SBC A,A | |||||||||||||||
28773 | ADD A,A | |||||||||||||||
28774 | INC A | |||||||||||||||
28775 | INC L | Byte 1 of the character's buffer holds his x-coordinate | ||||||||||||||
28776 | ADD A,(HL) | Add this to A | ||||||||||||||
28777 | LD E,A | E=x-coordinate of the location directly in front of the character | ||||||||||||||
28778 | INC L | L=2 | ||||||||||||||
28779 | LD D,(HL) | Pick up the character's y-coordinate in D | ||||||||||||||
28780 | PUSH HL | |||||||||||||||
28781 | LD HL,47422 | 47422 is the address of the door location table | ||||||||||||||
28784 | LD BC,1281 | B=5 (there are 5 doors), C=1 (the left study door is the first one) | ||||||||||||||
28787 | LD A,E | A=x-coordinate of the location directly in front of the character | ||||||||||||||
28788 | CP (HL) | Compare this with the x-coordinate of the door | ||||||||||||||
28789 | INC HL | |||||||||||||||
28790 | JR NZ,28796 | Jump if the x-coordinates don't match | ||||||||||||||
28792 | LD A,D | A=character's y-coordinate | ||||||||||||||
28793 | CP (HL) | Compare this with the y-coordinate of the door | ||||||||||||||
28794 | JR Z,28804 | Jump if they match (the character is standing at this door) | ||||||||||||||
28796 | INC HL | |||||||||||||||
28797 | RLC C | Move the set bit in C one place to the left | ||||||||||||||
28799 | DJNZ 28787 | Jump back to consider the remaining doors | ||||||||||||||
28801 | POP HL | |||||||||||||||
28802 | XOR A | Reset the carry flag: there is no door in front of the character | ||||||||||||||
28803 | RET | |||||||||||||||
The character is standing in front of a door.
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28804 | LD A,(32756) | Pick up the doors flags from 32756 | ||||||||||||||
28807 | AND C | Check the bit corresponding to the door | ||||||||||||||
28808 | POP HL | |||||||||||||||
28809 | RET NZ | Return with the carry flag reset if the door is open | ||||||||||||||
28810 | SCF | Set the carry flag: the door is closed | ||||||||||||||
28811 | RET |
Prev: 28736 | Up: Map | Next: 28812 |