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Added some comments and changed X velocity post paddle-collision to be proportional to the relative position of the ball and paddle

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Joe Adams 2017-12-10 20:39:34 +00:00
parent 54b9eb14f0
commit f08b0d5b75
1 changed files with 7 additions and 6 deletions
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13
breakout/breakout.c
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@ -234,24 +234,25 @@ int main(void) {
} }
void updateBall(double *ballX, double *ballY, double *ballVX, double *ballVY, double paddleX, int paddleWidth, int winWidth, int winHeight) { void updateBall(double *ballX, double *ballY, double *ballVX, double *ballVY, double paddleX, int paddleWidth, int winWidth, int winHeight) {
double ballNX = *ballX + *ballVX; double ballNX = *ballX + *ballVX; // Calculates the position of the ball on the next step
double ballNY = *ballY + *ballVY; double ballNY = *ballY + *ballVY;
double paddleRX = paddleX - (double)(winWidth / 2); double paddleRX = paddleX - (double)(winWidth / 2);
double paddleRY = 20 - (double)(winHeight / 2); double paddleRY = 20 - (double)(winHeight / 2);
if (ballNX > paddleRX && ballNY<paddleRY) { if (ballNX > paddleRX && ballNY<paddleRY) { // If to the right or below the top left corner of paddle
if (ballNX < paddleRX + paddleWidth) { if (ballNX < paddleRX + (double)paddleWidth) { // ...and to the left of the right side of the paddle (i.e. about to go inside inside the paddle)
*ballVY *= -1.0; *ballVY *= -1.0;
*ballVX = ((ballNX - paddleRX - (double)(paddleWidth/2))/((double)paddleWidth/2))*0.5; // Sets X velocity to be proportional to the relative position of the ball and the paddle on collision
} }
} }
if (ballNX > winWidth / 2 || ballNX < (-1.0*winWidth/2)) { if (ballNX > winWidth / 2 || ballNX < (-1.0*winWidth/2)) { // Collision with walls
*ballVX *= -1.0; *ballVX *= -1.0;
} }
if (ballNY > winHeight / 2) { if (ballNY > winHeight / 2) { // Collision with ceiling
*ballVY *= -1.0; *ballVY *= -1.0;
} }
if (ballNY < (-1.0*winHeight/2)) { if (ballNY < (-1.0*winHeight/2)) { // Collision with floor
*ballX = 0; *ballX = 0;
*ballY = 0; *ballY = 0;
*ballVX = -0.1; *ballVX = -0.1;