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Routines |
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Used by the routine at RunHarmfulBobbingBlock.
The handler of the object type 55, which no room uses. The block falls until it lands, and then it rises until it is at a height of B0, and falls again. It rises faster while something is standing on it. Flag bit 2 of the hit flags is used for the state: it is set while the block is rising.
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| RunBobbingBlock | CE31 | CALL SetSpriteOffset_Minus16_Minus8 | Call SetSpriteOffset_Minus16_Minus8 to set the offsets of the sprite. | |||||
| CE34 | XOR A | Set the speeds along x and y to zero. | ||||||
| CE35 | LD (IX+$09),A | |||||||
| CE38 | LD (IX+$0A),A | |||||||
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Fall until the block lands, then start rising.
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| CE3B | BIT 2,(IX+$0D) | Jump to RunBobbingBlock_Rising if the block is rising. | ||||||
| CE3F | JR NZ,RunBobbingBlock_Rising | |||||||
| CE41 | LD (IX+$0B),A | Set the speed along z to zero. | ||||||
| CE44 | CALL ApplyGravityAndMove | Call ApplyGravityAndMove to apply gravity to the block and move it. | ||||||
| CE47 | BIT 2,(IX+$0C) | Jump to RunBobbingBlock_Finish if the block has not landed. | ||||||
| CE4B | JR Z,RunBobbingBlock_Finish | |||||||
| CE4D | SET 2,(IX+$0D) | Flag the block as rising. | ||||||
| CE51 | LD (IX+$0B),$02 | Set the speed along z to 02. | ||||||
| RunBobbingBlock_Finish | CE55 | XOR A | Set the speeds along x and y to zero. | |||||
| CE56 | LD (IX+$09),A | |||||||
| CE59 | LD (IX+$0A),A | |||||||
| CE5C | JP SetWipeAndDrawFlags | Jump to SetWipeAndDrawFlags to flag the block as moved. | ||||||
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Rise towards B0, faster if something is standing on the block.
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| RunBobbingBlock_Rising | CE5F | LD A,($A77B) | Fetch the collision flags of the player. | |||||
| CE62 | AND %00001000 | Keep the flag for the player jumping. | ||||||
| CE64 | JR Z,RunBobbingBlock_Speed | Jump to RunBobbingBlock_Speed if the player is not jumping. | ||||||
| CE66 | RES 7,(IX+$17) | Clear the flag for something having landed on the block. | ||||||
| RunBobbingBlock_Speed | CE6A | LD A,(IX+$0B) | Fetch the speed along z. | |||||
| CE6D | AND A | Test it. | ||||||
| CE6E | BIT 7,(IX+$17) | Jump to RunBobbingBlock_Rise if something has landed on the block. | ||||||
| CE72 | JR NZ,RunBobbingBlock_Rise | |||||||
| CE74 | AND A | Jump to RunBobbingBlock_Fall if the block has no speed along z. | ||||||
| CE75 | JR Z,RunBobbingBlock_Fall | |||||||
| RunBobbingBlock_Rise | CE77 | LD A,$01 | Set the speed along z to one. | |||||
| CE79 | JP P,RunBobbingBlock_Move | Keep it at one if the block is rising and nothing has landed on it. | ||||||
| CE7C | ADD A,$02 | Otherwise make it three. | ||||||
| RunBobbingBlock_Move | CE7E | LD (IX+$0B),A | Set the speed along z of the block. | |||||
| CE81 | CALL ApplyGravityAndMove_Move | Call ApplyGravityAndMove_Move to move the block, without gravity. | ||||||
| CE84 | LD A,(IX+$03) | Jump to RunBobbingBlock_Finish if the block is lower than B0. | ||||||
| CE87 | CP $B0 | |||||||
| CE89 | JR C,RunBobbingBlock_Finish | |||||||
| CE8B | RES 2,(IX+$0D) | Flag the block as not rising. | ||||||
| CE8F | JR RunBobbingBlock_Finish | Jump to RunBobbingBlock_Finish to finish. | ||||||
| RunBobbingBlock_Fall | CE91 | CALL ApplyGravityAndMove | Call ApplyGravityAndMove to apply gravity to the block and move it. | |||||
| CE94 | RES 2,(IX+$0D) | Flag the block as not rising. | ||||||
| CE98 | JR RunBobbingBlock_Finish | Jump to RunBobbingBlock_Finish to finish. | ||||||
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