Routines
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C0F9: Handler: Display Room
Used by the routines at LoadFromTape, Handler_InjuryCheck and Action_Look.
On the first visit, show the picture and the long description, then list what is here and which ways lead out.
Handler_DisplayRoom C0F9 PUSH DE Keep DE safe on the stack.
C0FA CALL ClearScreen Call ClearScreen to clear the screen.
C0FD POP DE Restore DE from the stack.
C0FE LD A,($BAFE) Jump to Handler_DisplayRoom_PrintDescription when room descriptions are switched off.
C101 OR A
C102 JR Z,Handler_DisplayRoom_PrintDescription
C104 LD A,($BA9B) Search the picture list for this room. Jump to Handler_DisplayRoom_PrintDescription when it has no picture.
C107 LD HL,($BAE4)
C10A LD BC,($BAFE)
C10E CPIR
C110 JR NZ,Handler_DisplayRoom_PrintDescription
C112 LD A,($BAFE) Jump to Handler_DisplayRoom_FirstVisit when this visit should show the picture.
C115 INC C
C116 SUB C
C117 LD C,A
C118 XOR A
C119 OR E
C11A JR NZ,Handler_DisplayRoom_FirstVisit
C11C LD HL,$BA30 Find this room's visited flag.
C11F LD A,C
Handler_DisplayRoom_Loop C120 CP $08
C122 JR C,Handler_DisplayRoom_Next
C124 SUB $08 This room's flag is in the next flag byte.
C126 INC HL
C127 JR Handler_DisplayRoom_Loop
Handler_DisplayRoom_Next C129 LD B,A Turn that bit number into a flag mask.
C12A INC B
C12B LD D,$00
Handler_DisplayRoom_FlagBit C12D RL D
C12F DJNZ Handler_DisplayRoom_FlagBit
C131 LD A,(HL) Jump to Handler_DisplayRoom_PrintDescription when this room has already been visited.
C132 AND D
C133 JR NZ,Handler_DisplayRoom_PrintDescription
C135 LD A,(HL) Mark this room as visited.
C136 OR D
C137 LD (HL),A
Handler_DisplayRoom_FirstVisit C138 LD A,$08 Remember that the long description was shown, and set the text row to 08.
C13A LD ($BB40),A
C13D LD HL,$BA2C
C140 SET 0,(HL)
C142 LD IX,($BAE6) Call GetTableEntry to fetch this room's picture handler.
C146 LD E,C
C147 CALL GetTableEntry
C14A LD DE,$C14F Return to Handler_DisplayRoom_PrintDescription afterwards and jump to that handler.
C14D PUSH DE
C14E JP (HL)
Handler_DisplayRoom_PrintDescription C14F CALL SetScreenPosition Call SetScreenPosition to move the cursor to the text line stored at BB40.
C152 LD A,$18 Set the text row to 18, under the picture.
C154 LD ($BB40),A
C157 LD A,($BA9B) Call GetTableEntry to fetch this room's long description.
C15A LD IX,($BAE8)
C15E LD E,A
C15F CALL GetTableEntry
C162 CALL PrintStringAndANewline Call PrintStringAndANewline to print the room description and start a new line.
C165 LD HL,$BA2C Skip the key-wait unless the long description was just shown.
C168 BIT 0,(HL)
C16A JR Z,Handler_DisplayRoom_ListExits
C16C RES 0,(HL) Clear that flag and wait for a key.
C16E CALL GetUserInput
Handler_DisplayRoom_ListExits C171 CALL GetRoomPointer Call GetRoomPointer to fetch this room's six exits.
C174 LD D,H Count how many of the six exits leave this room.
C175 LD E,L
C176 LD B,$06
C178 LD C,$00
C17A XOR A
Handler_DisplayRoom_CountExits C17B CP (HL)
C17C JR Z,Handler_DisplayRoom_CountNext
C17E INC C
Handler_DisplayRoom_CountNext C17F INC HL
C180 DJNZ Handler_DisplayRoom_CountExits
C182 OR C Jump to Handler_DisplayRoom_ListObjects when there are no exits.
C183 JR Z,Handler_DisplayRoom_ListObjects
C185 LD A,C Jump to Handler_DisplayRoom_ManyExits when more than one exit is open.
C186 CP $01
C188 JR NZ,Handler_DisplayRoom_ManyExits
C18A LD HL,$BBBC Print " There is an exit ".
C18D CALL PrintString
C190 LD H,D Point back at the exits and the direction names for the one way out.
C191 LD L,E
C192 LD IX,$BDB2
C196 XOR A
C197 JR Handler_DisplayRoom_OneExit
Handler_DisplayRoom_SkipClosed C199 INC HL Skip a closed exit and move on to the next way out.
C19A INC IX
C19C INC IX
Handler_DisplayRoom_OneExit C19E CP (HL)
C19F JR Z,Handler_DisplayRoom_SkipClosed
C1A1 LD L,(IX+$00) Call PrintString to print the direction name.
C1A4 LD H,(IX+$01)
C1A7 CALL PrintString
C1AA JR Handler_DisplayRoom_FullStop Jump to Handler_DisplayRoom_FullStop to finish the exit sentence.
Handler_DisplayRoom_ManyExits C1AC LD HL,$BBA9 Print " There are exits:-".
C1AF CALL PrintStringAndANewline
C1B2 LD H,D Point back at the exits and the direction names.
C1B3 LD L,E
C1B4 LD IX,$BDB2
C1B8 XOR A
C1B9 JR Handler_DisplayRoom_ExitOpen
Handler_DisplayRoom_NextExit C1BB EX DE,HL Exchange the exit list back into HL and step to the next open way out.
Handler_DisplayRoom_StepExit C1BC INC HL
C1BD INC IX
C1BF INC IX
Handler_DisplayRoom_ExitOpen C1C1 CP (HL)
C1C2 JR Z,Handler_DisplayRoom_StepExit
C1C4 EX DE,HL Call PrintString to print the direction name.
C1C5 LD L,(IX+$00)
C1C8 LD H,(IX+$01)
C1CB CALL PrintString
C1CE DEC C Jump to Handler_DisplayRoom_FullStop when no exits remain.
C1CF LD A,C
C1D0 CP $01
C1D2 JR C,Handler_DisplayRoom_FullStop
C1D4 JR Z,Handler_DisplayRoom_And Jump to Handler_DisplayRoom_And to join the last exit with "and".
C1D6 LD A,$2C Print a comma between the exits.
C1D8 CALL PrintCharacter
C1DB XOR A Jump back to Handler_DisplayRoom_NextExit for the next exit.
C1DC JR Handler_DisplayRoom_NextExit
Handler_DisplayRoom_And C1DE LD HL,$BBA5 Print " & ".
C1E1 CALL PrintString
C1E4 XOR A Jump back to Handler_DisplayRoom_NextExit for the next exit.
C1E5 JR Handler_DisplayRoom_NextExit
Handler_DisplayRoom_FullStop C1E7 LD HL,$BCF9 Print ".".
C1EA CALL PrintStringAndANewline
Handler_DisplayRoom_ListObjects C1ED LD A,($BA9B) Call IsObjectPresent to see whether this room holds anything. Return when it does not.
C1F0 CALL IsObjectPresent
C1F3 RET NZ
C1F4 LD HL,$BB96 Print " You can see:-".
C1F7 CALL PrintStringAndANewline
C1FA LD A,($BA9B) Call PrintObjects to list what is in this room.
C1FD CALL PrintObjects
C200 RET Return.
View the equivalent code in;
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