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Routines |
| Prev: B3D4 | Up: Map | Next: B41F |
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Handler for the object types 44 to 47 (jellyfish). A jellyfish is a flying creature that is handled like the eagles and vultures (see Handle_Flying_Creature), except that its x velocity is always 30 (to the right) or D0 (to the left), and its y velocity only ever increases, up to 20 so that it sinks and bounces off the floor and the decorations.
If the jellyfish is in a different room x from Sabreman, Move_Creature_Horizontally moves it. If it is in a room that is below Sabreman's room, it is removed. If it is in a room that is above Sabreman's room, Move_Creature_Vertically moves it down.
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| Handle_Jellyfish | B3D8 | CALL Read_World_Map | Read the world map entry of the room that the jellyfish is in. The flags of the room are returned in E. | |||||
| B3DB | LD A,(IX+$0B) | Fetch the contact flags of the jellyfish. | ||||||
| B3DE | OR E | Combine them with the flags of the room. | ||||||
| B3DF | LD E,A | Store the result in E. | ||||||
| B3E0 | LD A,($8F1C) | Fetch the room x of Sabreman. | ||||||
| B3E3 | CP (IX+$02) | Jump to Move_Creature_Horizontally if the jellyfish is in a different room x. | ||||||
| B3E6 | JP NZ,Move_Creature_Horizontally | |||||||
| B3E9 | LD A,($8F1E) | Fetch the room y of Sabreman. | ||||||
| B3EC | CP (IX+$04) | Jump to Handle_Jellyfish_Animate if the jellyfish is in the same room y. | ||||||
| B3EF | JR Z,Handle_Jellyfish_Animate | |||||||
| B3F1 | JP NC,Move_Creature_Vertically | Jump to Move_Creature_Vertically if Sabreman is in a room below the jellyfish. | ||||||
| B3F4 | LD (IX+$00),$00 | Remove the jellyfish, as Sabreman is in a room above it. | ||||||
| B3F8 | RET | Return. | ||||||
| Handle_Jellyfish_Animate | B3F9 | CALL Animate_Jellyfish | Animate the jellyfish. | |||||
| B3FC | LD A,(IX+$09) | Fetch the y velocity. | ||||||
| B3FF | INC A | Add one to the y velocity, so that gravity slowly pulls the jellyfish down. | ||||||
| B400 | BIT 7,A | Jump to Handle_Jellyfish_Store_Y_Velocity if the y velocity is negative. | ||||||
| B402 | JR NZ,Handle_Jellyfish_Store_Y_Velocity | |||||||
| B404 | CP $21 | Jump to Handle_Jellyfish_Set_X_Velocity if the y velocity has reached 21. | ||||||
| B406 | JR NC,Handle_Jellyfish_Set_X_Velocity | |||||||
| Handle_Jellyfish_Store_Y_Velocity | B408 | LD (IX+$09),A | Store the y velocity. | |||||
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This entry point is used by the routine at Handle_Gargoyle.
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| Handle_Jellyfish_Set_X_Velocity | B40B | BIT 7,(IX+$08) | Jump to Handle_Jellyfish_Move_Left if the x velocity is negative. | |||||
| B40F | JR NZ,Handle_Jellyfish_Move_Left | |||||||
| B411 | LD (IX+$08),$30 | Set the x velocity to 30 (right). | ||||||
| B415 | JP Handle_Flying_Creature_Check_Contact | Jump to Handle_Flying_Creature_Check_Contact to check for contact and to move the jellyfish. | ||||||
| Handle_Jellyfish_Move_Left | B418 | LD (IX+$08),$D0 | Set the x velocity to D0 (left). | |||||
| B41C | JP Handle_Flying_Creature_Check_Contact | Jump to Handle_Flying_Creature_Check_Contact to check for contact and to move the jellyfish. | ||||||
| Prev: B3D4 | Up: Map | Next: B41F |