kbruen/y3s2-gui-pong
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Added ball physics

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This commit is contained in:
Kenneth Bruen 2022-03-21 01:59:09 +02:00
parent e2a0f56261
commit 77426a0b63
Signed by: kbruen
GPG key ID: C1980A470C3EE5B1
1 changed files with 52 additions and 11 deletions
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63
src/main.cpp
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@ -1,3 +1,4 @@
#include <iostream>
#include <functional>
#include <string>
#include <cmath>
@ -42,11 +43,13 @@ public:
class Ball : public Drawable {
public:
static constexpr GLfloat defaultVeloX = 0.5;
GLfloat radius;
GLfloat x, y;
GLfloat veloX, veloY;
Ball(GLfloat x, GLfloat y) : x(x), y(y), radius(0.025), veloX(0.4) {
Ball(GLfloat x, GLfloat y) : x(x), y(y), radius(0.025), veloX(defaultVeloX) {
}
@ -121,7 +124,7 @@ void display(void) {
int gameTime;
const GLfloat paddleMoveSpeed = 0.75;
const GLfloat paddleMoveSpeed = 0.8;
void idle() {
int newTime = glutGet(GLUT_ELAPSED_TIME);
@ -131,17 +134,55 @@ void idle() {
if (gameRunning) {
ball.update();
// Move paddle
leftPaddle.y += leftMove * paddleMoveSpeed * deltaTime;
rightPaddle.y += rightMove * paddleMoveSpeed * deltaTime;
// Clamp paddle to stay on screen
if (leftPaddle.y < -1) leftPaddle.y = -1;
if (rightPaddle.y < -1) rightPaddle.y = -1;
if (leftPaddle.y > 1 - leftPaddle.height) leftPaddle.y = 1 - leftPaddle.height;
if (rightPaddle.y > 1 - rightPaddle.height) rightPaddle.y = 1 - rightPaddle.height;
// Detect ball collission
if (leftPaddle.x <= (ball.x + ball.radius) && (ball.x - ball.radius) <= (leftPaddle.x + leftPaddle.width)) {
// Ball inside left-right area of left paddle
if (leftPaddle.y <= ball.y && ball.y <= leftPaddle.y + leftPaddle.height) {
// Ball inside up-down area of left paddle
ball.veloX = ball.defaultVeloX;
ball.veloY = Utils::nummap(ball.y, leftPaddle.y, leftPaddle.y + leftPaddle.height, (GLfloat)-1, (GLfloat)1);
}
}
else if (rightPaddle.x <= (ball.x + ball.radius) && (ball.x - ball.radius) <= (rightPaddle.x + rightPaddle.width)) {
// Ball inside left-right area of right paddle
if (rightPaddle.y <= ball.y && ball.y <= rightPaddle.y + rightPaddle.height) {
// Ball inside up-down area of right paddle
ball.veloX = -ball.defaultVeloX;
ball.veloY = Utils::nummap(ball.y, rightPaddle.y, rightPaddle.y + rightPaddle.height, (GLfloat)-1, (GLfloat)1);
}
}
else if (ball.x + ball.radius < -1) {
// Ball exited board on the left side
rightScore += 1;
ball.x = ball.y = 0;
gameRunning = false;
}
else if (ball.x - ball.radius > 1) {
// Ball exited board on the right side
leftScore += 1;
ball.x = ball.y = 0;
gameRunning = false;
}
else if (ball.y - ball.radius < -1) {
// Ball touched bottom side
ball.veloY *= -1;
}
else if (ball.y + ball.radius > 1) {
// Ball touched top side
ball.veloY *= -1;
}
}
// Move paddle
leftPaddle.y += leftMove * paddleMoveSpeed * deltaTime;
rightPaddle.y += rightMove * paddleMoveSpeed * deltaTime;
// Clamp paddle to stay on screen
if (leftPaddle.y < -1) leftPaddle.y = -1;
if (rightPaddle.y < -1) rightPaddle.y = -1;
if (leftPaddle.y > 1 - leftPaddle.height) leftPaddle.y = 1 - leftPaddle.height;
if (rightPaddle.y > 1 - rightPaddle.height) rightPaddle.y = 1 - rightPaddle.height;
glutPostRedisplay();
}