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Routines |
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Handles a ball that bounces straight up and down. It falls until it hits the floor, then it rises at a speed of 3 until it reaches the top of its bounce, which is 32 above the height at which it was first seen, and starts to fall again.
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Work out the top of the bounce if it is not already stored.
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| HandleBallUpDown | 47205 | CALL SetPixelAdjustments_Ball | Set the pixel adjustments of a ball. | |||||
| 47208 | LD A,(23485) | Fetch the height of the bounce from BallBounceHeight. | ||||||
| 47211 | AND A | Test whether it has been worked out. | ||||||
| 47212 | JR NZ,HandleBallUpDown_Frame | Jump to HandleBallUpDown_Frame if it has. | ||||||
| 47214 | LD A,(IX+3) | Fetch the height of the ball. | ||||||
| 47217 | ADD A,32 | Add 32 to get the height of the bounce. | ||||||
| 47219 | LD (23485),A | Store it at BallBounceHeight. | ||||||
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Fall until the ball hits the floor, then rise.
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| HandleBallUpDown_Frame | 47222 | CALL ToggleGraphic | Toggle the graphic of the ball between its two frames. | |||||
| 47225 | CALL PlaySoundFromHeight | Play the sound of a falling object. | ||||||
| 47228 | BIT 2,(IX+13) | Jump to HandleBallUpDown_Rise if the ball is rising. | ||||||
| 47232 | JR NZ,HandleBallUpDown_Rise | |||||||
| 47234 | CALL ApplyGravityAndMove | Apply gravity to the ball and move it. | ||||||
| 47237 | BIT 2,(IX+12) | Jump to HandleBallUpDown_Draw if the ball has not hit the floor. | ||||||
| 47241 | JR Z,HandleBallUpDown_Draw | |||||||
| 47243 | SET 2,(IX+13) | Flag the ball as rising. | ||||||
| 47247 | CALL PlayBumpSound | Play the sound of a bounce. | ||||||
| HandleBallUpDown_Draw | 47250 | JR SetDeadlyFlagsAndDraw | Make the ball deadly and flag it to be drawn again. | |||||
| HandleBallUpDown_Rise | 47252 | LD (IX+11),3 | Set the speed in Z to 3. | |||||
| 47256 | CALL ApplyGravityAndMove | Move the ball. | ||||||
| 47259 | LD A,(23485) | Fetch the height of the bounce from BallBounceHeight. | ||||||
| 47262 | CP (IX+3) | Compare it with the height of the ball. | ||||||
| 47265 | JR NC,HandleBallUpDown_Draw | Jump to HandleBallUpDown_Draw if the ball is still below the top of the bounce. | ||||||
| 47267 | RES 2,(IX+13) | Flag the ball as falling. | ||||||
| 47271 | JR HandleBallUpDown_Draw | Jump to HandleBallUpDown_Draw. | ||||||
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