C++ Classes with Raylib

ball.cpp

#include "ball.hpp"
#include <algorithm>

Ball::Ball(int x, int y, float radius, Color color, int speedX, int speedY)
	: x{ x }, y{ y }, radius{ radius }, color{ color }, speedX{ speedX }, speedY{ speedY }
{ }

void Ball::show() {
	DrawEllipse(x, y, radius, radius, color);
}

void Ball::move() {
	x += speedX;
	y += speedY;
	bounceOnEdge();
}

void Ball::bounceOnEdge() {
	const int r{ static_cast<int>(radius) };
	const int xMax{ GetScreenWidth() - r };
	const int yMax{ GetScreenHeight() - r };
	
	if (x < r || x > xMax) {
		speedX *= -1;
	}

	if (y < r || y > yMax) {
		speedY *= -1;
	}

	x = std::clamp(x, r, xMax);
	y = std::clamp(y, r, yMax);
}

ball.hpp

#include "raylib.h"

class Ball {
	// Private Members
	int x;
	int y;
	float radius;
	Color color;
	int speedX;
	int speedY;

public:
	Ball(int x, int y, float radius, Color color, int speedX, int speedY);
	void show();
	void move();

private:
	void bounceOnEdge();
};

main.cpp

#include "raylib.h"
#include "ball.hpp"
#include "resource_dir.h"	// utility header for SearchAndSetResourceDir
#include <vector>


int main () {
	constexpr size_t numberOfBalls{ 500 };
	std::vector<Ball> ballCollection;

	// Tell the window to use vsync and work on high DPI displays
	SetConfigFlags(FLAG_VSYNC_HINT | FLAG_WINDOW_HIGHDPI);

	// Create the window and OpenGL context
	InitWindow(1500, 800, "Hello Raylib");

	// Utility function from resource_dir.h to find the resources folder and set it as the current working directory so we can load from it
	SearchAndSetResourceDir("resources");

	// Load a texture from the resources directory
	Texture wabbit = LoadTexture("wabbit_alpha.png");
	for (size_t i{ 0 }; i < numberOfBalls; i++) {
		ballCollection.push_back(
			Ball{ 
				GetRandomValue(0, GetScreenWidth()), 
				GetRandomValue(0, GetScreenHeight()), 
				static_cast<float>(GetRandomValue(0, 80)),
				Color{ (unsigned char)GetRandomValue(0, 255), (unsigned char)GetRandomValue(0, 255), (unsigned char)GetRandomValue(0, 255), 255 },
				GetRandomValue(-5, 5),
				GetRandomValue(-5, 5)
			}
		);
	}
	
	// game loop
	while (!WindowShouldClose())		// run the loop until the user presses ESCAPE or presses the Close button on the window
	{
		// drawing
		BeginDrawing();

		// Setup the back buffer for drawing (clear color and depth buffers)
		ClearBackground(BLACK);

		// draw some text using the default font
		DrawText("Hello Raylib", 200,200,20,WHITE);

		for (Ball& ball : ballCollection) {
			ball.move();
			ball.show();
		}

		// draw our texture to the screen
		DrawTexture(wabbit, 400, 200, WHITE);

		
		// end the frame and get ready for the next one  (display frame, poll input, etc...)
		EndDrawing();
	}

	// cleanup
	// unload our texture so it can be cleaned up
	UnloadTexture(wabbit);

	// destroy the window and cleanup the OpenGL context
	CloseWindow();
	return 0;
}