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 Bouncing Ball on the Z axis: I can't fix a math error without help. (GIF)  (Read 1704 times) 0 Members and 1 Guest are viewing this topic.
tom_mai78101
 « Posted 2012-08-30 14:33:37 »

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:

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25 `   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
 « Reply #1 - Posted 2012-09-03 14:35:27 »

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.

 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 `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.`
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