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Pingpong example: Add convex paddles and speedup 

Game logic of the pingpong example was a bit boring, because the
angle of the ball never changed. This patch adds convex paddles.
The surface of the paddle is simulated to be a quarter of a circle.
Also, in each reflection, the speed of the ball increases.

Change-Id: I208e7322f2b4b849118d98959a6076458d20f409
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
This commit is contained in:
Andreas Buhr 2021-03-02 15:28:59 +01:00
parent 4b9c6e6934
commit d2e9a5113e
1 changed files with 50 additions and 2 deletions
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52
examples/bluetooth/pingpong/pingpong.cpp
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@ -136,11 +136,59 @@ void PingPong::checkBoundaries()
if (((m_ballX + ballWidth) > (1. - blockSize)) && (ballCenterY < (m_rightBlockY + blockHeight))
&& (ballCenterY > m_rightBlockY)) {
// right paddle collision
m_speedx = -std::abs(m_speedx);
// simulating paddle surface to be a quarter of a circle
float paddlecenter = m_rightBlockY + blockHeight / 2.;
float relpos = (ballCenterY - paddlecenter) / (blockHeight / 2.); // [-1 : 1]
float surfaceangle = M_PI_4 * relpos;
// calculation of surface normal
float normalx = -cos(surfaceangle);
float normaly = sin(surfaceangle);
// calculation of surface tangent
float tangentx = sin(surfaceangle);
float tangenty = cos(surfaceangle);
// calculation of tangentialspeed
float tangentialspeed = tangentx * m_speedx + tangenty * m_speedy;
// calculation of normal speed
float normalspeed = normalx * m_speedx + normaly * m_speedy;
// speed increase of 10%
normalspeed *= 1.1f;
if (normalspeed < 0) { // if we are coming from the left. To avoid double reflections
m_speedx = tangentialspeed * tangentx - normalspeed * normalx;
m_speedy = tangentialspeed * tangenty - normalspeed * normaly;
}
} else if ((m_ballX < blockSize) && (ballCenterY < (m_leftBlockY + blockHeight))
&& (ballCenterY > m_leftBlockY)) {
// left paddle collision
m_speedx = std::abs(m_speedx);
// simulating paddle surface to be a quarter of a circle
float paddlecenter = m_leftBlockY + blockHeight / 2.;
float relpos = (ballCenterY - paddlecenter) / (blockHeight / 2.); // [-1 : 1]
float surfaceangle = M_PI_4 * relpos;
// calculation of surface normal
float normalx = cos(surfaceangle);
float normaly = sin(surfaceangle);
// calculation of surface tangent
float tangentx = -sin(surfaceangle);
float tangenty = cos(surfaceangle);
// calculation of tangentialspeed
float tangentialspeed = tangentx * m_speedx + tangenty * m_speedy;
// calculation of normal speed
float normalspeed = normalx * m_speedx + normaly * m_speedy;
// speed increase of 10%
normalspeed *= 1.1f;
if (normalspeed < 0) { // if we are coming from the left. To avoid double reflections
m_speedx = tangentialspeed * tangentx - normalspeed * normalx;
m_speedy = tangentialspeed * tangenty - normalspeed * normaly;
}
} else if (m_ballY < 0) {
m_speedy = std::abs(m_speedy);
} else if (m_ballY + ballWidth > 1.f) {