Ball line collision
<p>In my Android game I detected the collision of a ball and line, but I don't know how to change ball velocity in relation with line angle.</p>

<pre><code>if(ball.collidesWith(line)){
    ball.nextTile();
    ball.mPhysicsHandler.setAngularVelocity(65);
    float xvelo=ball.mPhysicsHandler.getVelocityX();
    float yvelo=ball.mPhysicsHandler.getVelocityY();
    double lineAngle = Math.atan2(line.getY2() - line.getY1(), 
                                  line.getX1() - line.getX2()) * 180 / Math.PI;

    ???????????????????????????????

}
</code></pre>
