You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
119 lines
4.3 KiB
C++
119 lines
4.3 KiB
C++
#include <iostream>
|
|
#include <cmath>
|
|
#include <raylib-cpp.hpp>
|
|
#include "paddle.hpp"
|
|
#include "ball.hpp"
|
|
#include "math-helpers.hpp"
|
|
|
|
/* Global variables used to instantiate structs */
|
|
const int WIDTH = 1000;
|
|
const int HEIGHT = 480;
|
|
const int RECT_H = HEIGHT / 3;
|
|
const int RECT_W = 30;
|
|
const int PADDLE_SPEED = 8;
|
|
const int CIRC_RAD = 10;
|
|
const float BASE_BOUNCE_DEG = 30;
|
|
const float BASE_BOUNCE_RAD = (BASE_BOUNCE_DEG / 180.0) * M_PI;
|
|
const float BASE_SPEED_COMPONENTS = 7;
|
|
const float BASE_SPEED = sqrt(powf(BASE_SPEED_COMPONENTS, 2) * 2);
|
|
|
|
raylib::Vector2 changeVelocityAfterCollision(Paddle paddle, Ball ball) {
|
|
float paddle_mid_y = (paddle.getRect().y + paddle.getRect().GetHeight()) / 2.0; /* Middle y value of rectangle */
|
|
float ball_y = ball.pos.y; /* Y co-ordinate of ball */
|
|
|
|
float offset = paddle_mid_y - ball_y; /* Subtracting the ball coordinate will give us a value between -paddle_mid_y (represents bottom of paddle) and +paddle_mid_y (represents top of paddle) */
|
|
offset /= (paddle.getRect().GetHeight() / 2.0); /* Normalize the value, by dividing it by its magnitude. It is now a value between -1 and 1. */
|
|
// offset *= -1; /* Reverse the sign of the offset, so that -1 represents the top, and 1 represents the bottom */
|
|
|
|
float bounce_angle = offset * BASE_BOUNCE_RAD; /* Calculate the actual bounce angle from the base bounce angle. */
|
|
|
|
/* Calculate new velocities as multiples of the original velocity. I use sine and cosine, because when the ball hits the paddle
|
|
perpendicular to it (bounce angle is 0), the y_velocity should be 0 (i.e. It should bounce straight back). The sin function does
|
|
this for us. A similar reasoning was employed for the use of cosine */
|
|
float new_x_vel = abs(BASE_SPEED * cosf(bounce_angle)) * (-1 * signum(ball.vel.x)); /* Reverse the sign of the x-velocity */
|
|
float new_y_vel = abs(BASE_SPEED * sinf(bounce_angle)) * signum(ball.vel.y); /* Keep the sign of the y-velocity */
|
|
|
|
return raylib::Vector2(new_x_vel, new_y_vel);
|
|
}
|
|
|
|
|
|
int main() {
|
|
/* Initialize window */
|
|
raylib::Window window = raylib::Window(WIDTH, HEIGHT, "Pong");
|
|
SetTraceLogLevel(LOG_INFO);
|
|
window.ClearBackground(BLACK);
|
|
SetTargetFPS(60);
|
|
SetExitKey(KEY_Q);
|
|
|
|
/* Instantiate Paddle and Ball objects */
|
|
Paddle pad1 = Paddle(10, 10, RECT_W, RECT_H);
|
|
Paddle pad2 = Paddle(window.GetWidth() - RECT_W - 10, 10, RECT_W, RECT_H);
|
|
Ball ball = Ball(window.GetWidth()/2, window.GetHeight()/2, CIRC_RAD, 5, 5);
|
|
|
|
window.BeginDrawing();
|
|
pad1.draw();
|
|
pad2.draw();
|
|
ball.draw();
|
|
|
|
/* Main loop */
|
|
while (!window.ShouldClose()) {
|
|
/* Update paddle velocity */
|
|
if (IsKeyPressed(KEY_S)) {
|
|
pad1.velocity.y = PADDLE_SPEED; /* Set positive (downward) velocity, since (0,0) is top-left */
|
|
}
|
|
if (IsKeyPressed(KEY_W)) {
|
|
pad1.velocity.y = (-1) * PADDLE_SPEED; /* Set negative (upward) velocity */
|
|
}
|
|
|
|
if (IsKeyReleased(KEY_S) || IsKeyReleased(KEY_W)) {
|
|
pad1.velocity.y = 0;
|
|
}
|
|
|
|
if (IsKeyPressed(KEY_UP)) {
|
|
pad2.velocity.y = (-1) * PADDLE_SPEED;
|
|
}
|
|
if (IsKeyPressed(KEY_DOWN)) {
|
|
pad2.velocity.y = PADDLE_SPEED;
|
|
}
|
|
if (IsKeyReleased(KEY_UP) || IsKeyReleased(KEY_DOWN)) {
|
|
pad2.velocity.y = 0;
|
|
}
|
|
|
|
/* Update ball velocity based on collision detection */
|
|
if (pad1.getRect().CheckCollision(ball.pos, ball.radius)) { /* Collision with paddle 1 */
|
|
ball.pos.x = pad1.getRect().x + pad1.getRect().GetWidth() + ball.radius + 1; /* Ensuring that the ball doesn't get stuck inside the paddle */
|
|
ball.vel = changeVelocityAfterCollision(pad1, ball);
|
|
|
|
}
|
|
if (pad2.getRect().CheckCollision(ball.pos, ball.radius)) { /* Collision with paddle 2 */
|
|
ball.pos.x = pad2.getRect().x - ball.radius - 1;
|
|
ball.vel = changeVelocityAfterCollision(pad2, ball);
|
|
}
|
|
|
|
if (ball.pos.x + ball.radius >= window.GetWidth()) { /* Collision with right wall */
|
|
pad1.incrementPoints();
|
|
ball.pos = raylib::Vector2(window.GetWidth() / 2, window.GetHeight() / 2);
|
|
}
|
|
if (ball.pos.x - ball.radius <= 0) { /* Collision with left wall */
|
|
pad2.incrementPoints();
|
|
ball.pos = raylib::Vector2(window.GetWidth() / 2, window.GetHeight() / 2);
|
|
}
|
|
if (ball.pos.y - ball.radius <= 0 || ball.pos.y + ball.radius >= window.GetHeight()) { /* Collision with top and bottom wals */
|
|
ball.vel.y = ball.vel.y * -1;
|
|
}
|
|
|
|
/* Draw objects */
|
|
|
|
window.BeginDrawing();
|
|
window.ClearBackground(BLACK);
|
|
pad1.draw();
|
|
pad2.draw();
|
|
ball.draw();
|
|
window.EndDrawing();
|
|
}
|
|
|
|
window.Close();
|
|
|
|
return 0;
|
|
}
|