Bouncing Ball on the Z axis: I can't fix a math error without help. (GIF)

[tom_mai78101]

Here's a GIF depicting the way I want my ball to bounce.



And here's the code, the problem currently unsolved. "dstRect" is a custom class that allows me to blit a bitmap onto the Canvas:

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private void jump() {       double value = Math.cos(radians + Math.PI) * multiplier;       dstRect.left -= position[2] + oldXOffset;       dstRect.right += position[2] + oldXOffset;       dstRect.top -= position[2] + oldXOffset;       dstRect.bottom += position[2] + oldXOffset;       position[2] = (float) value + 8;       radians += 0.1 * radianSpeed;       if (radians > 2 * Math.PI) {          multiplier -= 4;          value = Math.cos(radians + Math.PI) * multiplier;          oldXOffset += position[2] - (float) value + 8;          radians = 0;          radianSpeed += 2;          if (multiplier < 2.0) {             jumping = false;             multiplier = 8;             oldXOffset = 0f;             radianSpeed = 1;             position[2] = 0f;             for (int i = 0; i < 2; i++)                speed[i] = 0f;          }       }    }

The problem is this:

It starts off by triggering a switch, where the ball itself goes into a jumping state.

• On the first jump, it is normal. Ball starts jumping from the ground, flies into the air, and back down to the ground.
• On the second jump, it starts glitching out. Ball starts from the middle in the air, flies even higher, and back to the middle.
• On the third and last jump, the ball starts 1/3 from the peak of its jump, flies up to its peak, and back down 1/3 from its peak.

After that, the ball exits the jumping state, the ball goes back to the ground.

I wished I could think more on this.

[tom_mai78101]

I was playing an NDS game, when suddenly an inspiration popped into my head after looking at a in-game statue sprite.

After tinkering with the idea, I finally fixed the problem. Here's the code.

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float radians; float radianSpeed; float multipler; float result; public void calculate(){    result = (float) Math.cos(radians + Math.PI) * multipler + multipler;    radians += 0.2f * radianSpeed;    if (radians > 2 * Math.PI){       radianSpeed += 1;       radians = 0f;       multipler -= 1;       if (multipler <= 0){          multipler = 0f;          radians = 0f;       }    } } // Rest of the code, it's up the developer's implementation.