// Check collision with paddle
public bool Collide(WidgetPaddle paddle)
{
bool result = false;
// This isn't normally how you check if a circle intersects with a line, I'm cheating for now
if (dPosY + m_dRadius >= paddle.dPosY && dPosY <= paddle.dPosY)
{
if (dPosX >= paddle.dPosX - paddle.m_dWidth * 0.5 && dPosX <= paddle.dPosX + paddle.m_dWidth * 0.5)
result = true;
else if (Math.Sqrt(Math.Pow(dPosX - (paddle.dPosX - paddle.m_dWidth * 0.5), 2) + Math.Pow(0, 2)) <= m_dRadius)
result = true;
else if (Math.Sqrt(Math.Pow(dPosX - (paddle.dPosX + paddle.m_dWidth * 0.5), 2) + Math.Pow(0, 2)) <= m_dRadius)
result = true;
}
return result;
}
// Update ball's position and velocity, checking collision with the current paddle
public void Update(WidgetPaddle paddle)
{
// Apply gravity
m_dVelY += m_dGravity;
// Update position
dPosX += m_dVelX;
dPosY += m_dVelY;
if (dPosY > m_dMaxY)
{
// Check and handle falling below play area
Reset();
if (m_OnFall != null)
m_OnFall(this, this);
}
else if (Collide(paddle))
{
// Check and handle collision with the paddle
// Reverse vertical velocity
m_dVelY *= -1;
dPosY = paddle.dPosY - m_dRadius;
// Make the ball bounce off a bit based on distance from centre of paddle to make things interesting
m_dVelX += (dPosX - paddle.dPosX) * paddle.m_dAngle;
// Bring the ball's velocity closer to the paddle's
//m_dVelX = paddle.m_dVelX * paddle.m_dFriction + m_dVelX * (paddle.m_dFriction - 1);
if (m_OnCollide != null)
m_OnCollide(this, this);
}
// Enforce horizontal bounds, bouncing off if violated
if (dPosX > m_dMaxX)
{
dPosX = m_dMaxX;
m_dVelX *= -1;
}
else if (dPosX < m_dMinX)
{
dPosX = m_dMinX;
m_dVelX *= -1;
}
}