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I had set angle but it's not correct and I'm not getting exactly what I needed. The ball should bounce when hit to paddle or border and move in opposite direction. I'm writing the code in c++.

I had presently written this code when the ball and paddle intersects and I couldn't get how the code is working.

auto paddleY=paddleSpr->getPositionY(); auto intersectY=ballSpr->getPositionY(); auto paddleheight=65; auto maxBounceAngle=45; auto speed =1550; auto relativeIntersectY=(paddleY+(paddleheight/2))-intersectY; auto normalizedRelativeIntersectY=(relativeIntersectY/(paddleheight/2)); auto bounceAngle=normalizedRelativeIntersectY*maxBounceAngle; float vx = cos(bounceAngle * M_PI / 180) * speed; float vy = sin(bounceAngle * M_PI / 180) * speed; pbody11->setVelocity(Vect(vx,vy));
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  • \$\begingroup\$ Please post your code. \$\endgroup\$ Commented Dec 9, 2016 at 6:14
  • \$\begingroup\$ I had added my code .plz help me. \$\endgroup\$ Commented Dec 9, 2016 at 6:33
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    \$\begingroup\$ I really don't like auto for int's, i can't help it. \$\endgroup\$ Commented Dec 9, 2016 at 9:19

1 Answer 1

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in my opinion , setting speed to negative should fix the problem ( which negative is opposite with positive ) : 

auto paddleheight=65; auto maxBounceAngle=45; auto speed=-1550; auto relativeIntersectY=(paddleY+(paddleheight/2))-intersectY; auto normalizedRelativeIntersectY=(relativeIntersectY/(paddleheight/2)); auto bounceAngle=normalizedRelativeIntersectY*maxBounceAngle; float vx = cos(bounceAngle * M_PI / 180) * speed; float vy = sin(bounceAngle * M_PI / 180) * speed; pbody11->setVelocity(Vect(vx,vy));

UNTESTED , because it is not possible without full project file .

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