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Routines |
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Sends the player to the room to the west if it has gone past the west edge of the room. The x position is set to 0, which PlacePlayerAtDoor takes as the sign that the player has come out of the west and puts it at the east side of the new room.
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Leave if past the west edge.
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| LeaveRoomToWest | 51866 | POP HL | Unstack the size of the room in X and Y. | |||||||
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Work out the coordinate of the west edge of the room.
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| 51867 | LD A,128 | Set A to 128. | ||||||||
| 51869 | SUB L | Subtract L. | ||||||||
| 51870 | LD L,A | Copy it to L. | ||||||||
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Add the speed in X and the width of the player to the X coordinate.
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| 51871 | LD A,(IX+1) | Fetch the x position of the player. | ||||||||
| 51874 | ADD A,(IX+9) | Add the speed along the x axis. | ||||||||
| 51877 | ADD A,(IX+4) | Add the width of the player. | ||||||||
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Compare it with the west edge.
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| 51880 | CP L | Return if the player is still in the room. | ||||||||
| 51881 | RET NC | |||||||||
| 51882 | LD (IX+1),0 | Write 0 to the x position. | ||||||||
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Fetch the room number and stash it in L.
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| 51886 | LD A,(IX+8) | Fetch the room number. | ||||||||
| 51889 | LD L,A | Copy it to L. | ||||||||
| 51890 | DEC A | Go to the room to the west. | ||||||||
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This entry point is used by the routine at LeaveRoomToEast.
Change the column. The room number has the row in the high nibble and the column in the low nibble.
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| ChangeRoomEastWest | 51891 | AND %00001111 | Keep the column of the new room number. | |||||||
| 51893 | LD H,A | Copy it to H. | ||||||||
| 51894 | LD A,L | Fetch the old room number. | ||||||||
| 51895 | AND %11110000 | Keep only bits 4-7. | ||||||||
| 51897 | OR H | Combine the row with the new column. | ||||||||
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This entry point is used by the routines at LeaveRoomToNorth and LeaveRoomToSouth.
Change the room of the player. Bits 4 and 5 of the collision flags start the entering-room counter at 3. If the object is the player then it is copied and replaced by sparkles, and the game loop is started again.
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| ChangeRoom | 51898 | LD (IX+8),A | Store the new room number. | |||||||
| 51901 | LD A,(IX+12) | Fetch the collision flags. | ||||||||
| 51904 | OR %00110000 | Set the counter of the player entering the room to 3. | ||||||||
| 51906 | LD (IX+12),A | Store the collision flags. | ||||||||
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Fetch the graphic number and take 16 off it.
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| 51909 | LD A,(IX+0) | Fetch the graphic number of the object. | ||||||||
| 51912 | SUB 16 | Subtract 16. | ||||||||
| 51914 | CP 64 | Compare it with 64. | ||||||||
| 51916 | RET NC | Return if it is not one of the graphics of the human or the wulf. | ||||||||
| 51917 | INC SP | Drop the two return addresses on the stack, as the game loop starts again. | ||||||||
| 51918 | INC SP | |||||||||
| 51919 | INC SP | |||||||||
| 51920 | INC SP | |||||||||
| 51921 | PUSH IX | Point HL at the player (using the stack). | ||||||||
| 51923 | POP HL | |||||||||
| 51924 | LD DE,53601 | Point DE at PlayerCopy. | ||||||||
| 51927 | LD BC,64 | Set the length to 64, for the two halves of the player. | ||||||||
| 51930 | LDIR | Copy the player. | ||||||||
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Remember the sprites, then turn the copy into sparkles.
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| 51932 | LD A,(53601) | Fetch the sprite of the bottom half. | ||||||||
| 51935 | LD (53617),A | Keep it as the sprite that the bottom half will appear as. | ||||||||
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Copy the graphic number of the top half into the same field of the top half from PlayerCopy_TopHalf.
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| 51938 | LD A,(53633) | Fetch the sprite of the top half. | ||||||||
| 51941 | LD (53649),A | Keep it as the sprite that the top half will appear as. | ||||||||
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Fetch the graphic number of the first of the sparkles that show the player appearing.
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| 51944 | LD A,120 | Write 120 to PlayerCopy and PlayerCopy_TopHalf. | ||||||||
| 51946 | LD (53601),A | |||||||||
| 51949 | LD (53633),A | |||||||||
| 51952 | JP RunGame | Start the game loop again, which builds the new room. | ||||||||
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View the equivalent code in;
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