Routines
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6496: Guide a character to a location on the same floor
Used by the routine at 63BE when the character under consideration is on the same floor as his destination.
Input
DE Character's coordinates
H Character number (0x98-0xA9)
L 0x65
6496 INC L Point HL at the destination x-coordinate
6497 LD A,E A=character's current x-coordinate
6498 CP (HL) Is the character at the destination?
6499 JR NZ,$64A5 Jump if not
649B LD L,$60 Byte 0x60 holds the character's animatory state
649D BIT 0,(HL) Is the character midstride?
649F JP Z,$62A8 Move to the next command in the command list if not
64A2 JP $641B Otherwise finish the stride
The character hasn't reached his destination yet. Figure out his next move.
64A5 LD A,D A=character's y-coordinate
64A6 CP $A9 Set the zero flag if the character is on the bottom floor
64A8 LD A,(HL) A=destination x-coordinate
64A9 JP Z,$641B Jump if the character is on the bottom floor
The character is on the middle floor or the top floor. But which side of the wall?
64AC LD A,D A=character's y-coordinate
64AD CP $9B Set the zero flag if the character is on the top floor
64AF LD A,$39 This is the x-coordinate of the wall between the Map and Reading Rooms
64B1 JR Z,$64B5 Jump if the character is on the top floor
64B3 LD A,$26 This is the x-coordinate of the wall between the White and Exam Rooms
64B5 CP E Is the character to the left of the wall?
64B6 JR NC,$64C0 Jump if so
The character is on the right side of the wall.
64B8 CP (HL) Compare the wall's x-coordinate (in A) with the destination x-coordinate
64B9 LD A,(HL) A=destination x-coordinate
64BA JP C,$641B Jump if the character doesn't need to go down the stairs
64BD JP $63F6 Send the character to the top of the staircase
The character is on the left side of the wall.
64C0 CP (HL) Compare the wall's x-coordinate (in A) with the destination x-coordinate
64C1 LD A,(HL) A=destination x-coordinate
64C2 JP NC,$641B Jump if the character doesn't need to go down the stairs
64C5 LD A,$0C This is the x-coordinate of the tops of the staircases at the left of the skool
64C7 JP $63F8 Send the character to the top of the staircase
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