demo5_sprites_bouncing/source/main.cpp

#include <SDL2/SDL.h>
#include "texture.h"
#include "ball.h"
#include "defines.h"
#include "dbgtxt.h"
#include <iostream>
#include <vector>

SDL_Window *window = nullptr;
SDL_Renderer *renderer = nullptr;
SDL_Event *event;
Texture *texture = nullptr;
std::vector<Ball *> balls;
int test[8] = {1, 10, 100, 500, 1000, 10000, 50000, 100000};

bool shouldExit = false;
Uint32 ticks = 0;
int index = 0;
std::string text = "";
int textPos = 0;
bool showText = true;
int counter = 0;

void deleteBalls();

void setText()
{
	const std::string text2 = test[index] == 1 ? " PELOTA" : " PELOTAS";
	text = std::to_string(test[index]) + text2;
	const int size = text.size() * 8;
	textPos = SCREEN_WIDTH / 2 - size / 2;
	counter = TEXT_TIME;
	showText = true;
}

void initBalls(int value)
{
	deleteBalls();
	for (int i = 0; i < test[value]; ++i)
	{
		const int sign = ((rand() % 2) * 2) - 1;
		;
		const float x = (rand() % (SCREEN_WIDTH / 2)) + (SCREEN_WIDTH / 4);
		const float vx = (((rand() % 20) + 10) * 0.1f) * sign;
		const float vy = ((rand() % 60) - 30) * 0.1f;
		const color_t color = {(rand() % 192) + 32, (rand() % 192) + 32, (rand() % 192) + 32};
		Ball *b = new Ball(x, vx, vy, color, texture);
		balls.push_back(b);
	}
	setText();
}

void pushUpBalls()
{
	for (auto ball : balls)
	{
		const int sign = ((rand() % 2) * 2) - 1;
		const float vx = (((rand() % 20) + 10) * 0.1f) * sign;
		const float vy = ((rand() % 40) * 0.1f) + 5;
		ball->modVel(vx, -vy);
	}
}

void switchBallsGravity()
{
	for (auto ball : balls)
	{
		if (ball)
		{
			ball->switchGravity();
			;
		}
	}
}

void deleteBalls()
{
	for (auto ball : balls)
	{
		if (ball)
		{
			delete ball;
			ball = nullptr;
		}
	}
	balls.clear();
}

bool init()
{
	// Initialization flag
	bool success = true;

	// Initialize SDL
	if (SDL_Init(SDL_INIT_VIDEO) < 0)
	{
		printf("SDL could not initialize! SDL Error: %s\n", SDL_GetError());
		success = false;
	}
	else
	{
		// Create window
		window = SDL_CreateWindow(WINDOW_CAPTION, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH * WINDOW_SIZE, SCREEN_HEIGHT * WINDOW_SIZE, SDL_WINDOW_SHOWN);
		if (window == nullptr)
		{
			printf("Window could not be created! SDL Error: %s\n", SDL_GetError());
			success = false;
		}
		else
		{
			// Create renderer for window
			renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
			if (renderer == nullptr)
			{
				printf("Renderer could not be created! SDL Error: %s\n", SDL_GetError());
				success = false;
			}
			else
			{
				// Initialize renderer color
				SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);

				// Establece el tamaño del renderizador
				SDL_RenderSetLogicalSize(renderer, SCREEN_WIDTH, SCREEN_HEIGHT);
			}
		}
	}

	event = new SDL_Event();

	texture = new Texture(renderer, "resources/pelota.png");
	ticks = SDL_GetTicks();
	srand(time(nullptr));
	dbg_init(renderer);
	initBalls(index);

	return success;
}

void close()
{
	// Destroy window
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	window = nullptr;
	renderer = nullptr;

	if (event)
	{
		delete event;
		event = nullptr;
	}

	if (texture)
	{
		delete texture;
		texture = nullptr;
	}

	deleteBalls();

	// Quit SDL subsystems
	SDL_Quit();
}

void checkEvents()
{
	// Comprueba los eventos que hay en la cola
	while (SDL_PollEvent(event) != 0)
	{
		// Evento de salida de la aplicación
		if (event->type == SDL_QUIT)
		{
			shouldExit = true;
			break;
		}

		if (event->type == SDL_KEYDOWN && event->key.repeat == 0)
		{
			switch (event->key.keysym.sym)
			{
			case SDLK_ESCAPE:
				shouldExit = true;
				break;

			case SDLK_SPACE:
				pushUpBalls();
				break;

			case SDLK_g:
				switchBallsGravity();
				break;

			case SDLK_1:
				index = 0;
				initBalls(index);
				break;

			case SDLK_2:
				index = 1;
				initBalls(index);
				break;

			case SDLK_3:
				index = 2;
				initBalls(index);
				break;

			case SDLK_4:
				index = 3;
				initBalls(index);
				break;

			case SDLK_5:
				index = 4;
				initBalls(index);
				break;

			case SDLK_6:
				index = 5;
				initBalls(index);
				break;

			case SDLK_7:
				index = 6;
				initBalls(index);
				break;

			case SDLK_8:
				index = 7;
				initBalls(index);
				break;
			}
		}
	}
}

void update()
{
	if (SDL_GetTicks() - ticks > 15)
	{
		ticks = SDL_GetTicks();

		for (auto ball : balls)
		{
			ball->update();
		}

		if (counter > 0)
			counter--;
		else
			showText = false;
	}
}

void render()
{
	SDL_SetRenderDrawColor(renderer, 32, 32, 32, 255);
	SDL_RenderClear(renderer);

	for (auto ball : balls)
	{
		ball->render();
	}

	if (showText)
		dbg_print(textPos, 8, text.c_str(), 255, 255, 255);

	SDL_RenderPresent(renderer);
}

int main(int argc, char *args[])
{
	init();

	while (!shouldExit)
	{
		update();
		checkEvents();
		render();
	}

	close();

	return 0;
}