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Routines |
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Handler for the object types 58 to 5B (a bubble that rises). A bubble is made by Spawn_Bubble, or by Release_Bubble.
The bubble rises by two pixels on each call. The contact flags (byte 0B) are set to the flags of the room, which lets other objects stand on top of it (see Check_Bubble_Contact). The counter in byte 06 goes up on each call and makes the two low bits of the type, so the bubble goes through three frames.
A bubble in a room with a ceiling bursts when it reaches the ceiling and becomes a sparkle (the type 72 see Handle_Sparkle). A bubble in a room with no ceiling moves into the room above when it reaches the top. A bubble that has just been made in a room with a floor and a ceiling, and is AF or more down the screen, is removed.
If the bubble is in a different room from Sabreman, Move_Distant_Bubble moves it.
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| Handle_Bubble | E117 | CALL StoreEntity | Save the state of the bubble. | |||||
| E11A | LD A,($8F1C) | Fetch the room x of Sabreman. | ||||||
| E11D | CP (IX+$02) | Jump to Move_Distant_Bubble if the bubble is in a different room x. | ||||||
| E120 | JP NZ,Move_Distant_Bubble | |||||||
| E123 | LD A,($8F1E) | Fetch the room y of Sabreman. | ||||||
| E126 | CP (IX+$04) | Jump to Move_Distant_Bubble if the bubble is in a different room y. | ||||||
| E129 | JP NZ,Move_Distant_Bubble | |||||||
| E12C | DEC (IX+$03) | Move the bubble up two pixels. | ||||||
| E12F | DEC (IX+$03) | |||||||
| E132 | LD (IX+$0A),$50 | Reset the countdown in byte 0A to 50. | ||||||
| E136 | CALL Read_World_Map | Read the world map entry of the room that the bubble is in. The flags of the room are returned in E. | ||||||
| E139 | LD (IX+$0B),E | Store the flags of the room in the contact flags. | ||||||
| E13C | BIT 0,E | Test bit 0 of the flags (the ceiling). | ||||||
| E13E | LD A,(IX+$03) | Fetch the y position. | ||||||
| E141 | JR Z,Handle_Bubble_No_Ceiling | Jump to Handle_Bubble_No_Ceiling if the room has no ceiling. | ||||||
| E143 | CP $42 | Jump to Handle_Bubble_Pop if the bubble has reached the ceiling. | ||||||
| E145 | JP C,Handle_Bubble_Pop | |||||||
| E148 | CP $AF | Jump to Handle_Bubble_Animate if the y position is less than AF. | ||||||
| E14A | JR C,Handle_Bubble_Animate | |||||||
| E14C | BIT 4,E | Jump to Handle_Bubble_Animate if the room has no floor. | ||||||
| E14E | JR Z,Handle_Bubble_Animate | |||||||
| E150 | BIT 0,(IX+$0F) | Jump to Handle_Bubble_Animate if the bubble has been drawn already. | ||||||
| E154 | JR Z,Handle_Bubble_Animate | |||||||
| E156 | LD (IX+$00),$00 | Remove the bubble. | ||||||
| E15A | RET | Return. | ||||||
| Handle_Bubble_Animate | E15B | INC (IX+$06) | Add one to the animation counter of the bubble. | |||||
| E15E | LD A,(IX+$06) | Fetch the animation counter of the bubble. | ||||||
| E161 | AND %00000011 | Keep only the two low bits. | ||||||
| E163 | ADD A,$58 | Add 58 to make the type. | ||||||
| E165 | LD (IX+$00),A | Store the type. | ||||||
| E168 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
| Handle_Bubble_No_Ceiling | E16B | CP $22 | Jump to Handle_Bubble_Animate if the bubble is still in the room. | |||||
| E16D | JR NC,Handle_Bubble_Animate | |||||||
| E16F | DEC (IX+$04) | Move the bubble to the room above. | ||||||
| E172 | BIT 0,(IX+$0F) | Return if the bubble has not been drawn yet. | ||||||
| E176 | RET NZ | |||||||
| E177 | JP RemoveEntity | Erase the sprite of the bubble. | ||||||
| Handle_Bubble_Pop | E17A | BIT 0,(IX+$0F) | Jump to Remove_Unseen_Weapon to remove the bubble if it has not been drawn yet. | |||||
| E17E | JP NZ,Remove_Unseen_Weapon | |||||||
| E181 | LD (IX+$00),$72 | Change the bubble into a sparkle. | ||||||
| E185 | LD (IX+$08),$03 | Set the counter in byte 08 to 03. | ||||||
| E189 | JP Update_Object_Sprite | Jump to Update_Object_Sprite. | ||||||
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