SFML

#include <SFML/Graphics.hpp>
#include <iostream>
#include <fstream>
#include <string>
#define win_width 640
#define win_height 640

using namespace sf;
using namespace std;

int main()
{
    RenderWindow window(VideoMode(win_width, win_height), "SFML works!");

    float rect1_pos_x = 0, rect1_pos_y = 0;
    int rect1_width = 20, rect1_height = 140, rect2_width = 50, rect2_height = 50;

    float prev_pos_y = 0;

    float gravity_force = 0.2;
    float movementSpeed;

    bool onFloor = true;

    View view1;
    view1.setSize(win_width, win_height);

    Texture niebo_tex;
    Texture pagorek_tex;
    Texture trawa_tex;

    if(!niebo_tex.loadFromFile("niebo.png")) {
        cout << "niebo.png loading error\n";
    }
    if(!pagorek_tex.loadFromFile("pagorek.png")) {
        cout << "pagorek.png loading error\n";
    }
    if(!trawa_tex.loadFromFile("trawa.png")) {
        cout << "ziemia.png loading error\n";
    }
    string line;
    ifstream level1;
    level1.open("level1.txt", ios::in);

    int trawa_count = 30;

    float trawa_pos_x[trawa_count], trawa_pos_y[trawa_count];
    int i = 0;

    if(level1.is_open()) {
        float y = 0;
        while(getline(level1, line)) {
            for(int x = 0; x < line.length(); x++) {
                if(line[x] == 'd') {
                    trawa_pos_x[i] = 64 * x;
                    trawa_pos_y[i] = 64 * y;
                    i++;
                }
            }
            y++;
        }
    }
    else {
        cout << "Unable to load level1.txt/n";
    }

    Sprite niebo;
    Sprite pagorek;
    Sprite trawa;

    niebo.setTexture(niebo_tex);
    pagorek.setTexture(pagorek_tex);
    trawa.setTexture(trawa_tex);

    RectangleShape rect1(Vector2f(rect1_width, rect1_height));
    RectangleShape rect2(Vector2f(rect2_width, rect2_height));

    while(window.isOpen()) {

        Event event;
        while(window.pollEvent(event)) {
            switch(event.type) {
            case Event::Closed:
                window.close();
                break;
            case Event::KeyPressed:
                break;
            default:
                break;
            }
        }

        rect1_pos_y += gravity_force;
        for(int x = 0; x < trawa_count; x++) {
            if(rect1_pos_x < trawa_pos_x[x] + 64 && rect1_pos_x + rect1_width > trawa_pos_x[x] && rect1_pos_y + rect1_height > trawa_pos_y[x] && rect1_pos_y < trawa_pos_y[x] + 64) {
                onFloor = true;
                rect1_pos_y -= gravity_force;
            }
            else {
                onFloor = false;
            }
            if(rect1_pos_y < trawa_pos_y[x] + 64 && rect1_pos_y + rect1_height > trawa_pos_y[x] && rect1_pos_x < trawa_pos_x[x] + 64 && rect1_pos_x + rect1_width > trawa_pos_x[x]) {
                rect1_pos_x += movementSpeed;
            }

            if(rect1_pos_y < trawa_pos_y[x] + 64 && rect1_pos_y + rect1_height > trawa_pos_y[x] && rect1_pos_x + rect1_width > trawa_pos_x[x] - 0.5 && rect1_pos_x + rect1_width < trawa_pos_x[x] + 64) {
                rect1_pos_x -= movementSpeed;
            }
        }

        if(Keyboard::isKeyPressed(Keyboard::D)) {
            rect1_pos_x += movementSpeed;
        }
        if(Keyboard::isKeyPressed(Keyboard::A)) {
            rect1_pos_x -= movementSpeed;
        }
        if(Keyboard::isKeyPressed(Keyboard::S)) {

        }
        if(Keyboard::isKeyPressed(Keyboard::W)) {
            if(onFloor == true) {
                prev_pos_y = rect1_pos_y;
            }
            if(rect1_pos_y < prev_pos_y + 30) {
                rect1_pos_y -= 0.3;
            }
            cout << onFloor << endl;
        }
        if(Keyboard::isKeyPressed(Keyboard::LShift)) {
            movementSpeed = 0.2;
        }
        else {
            movementSpeed = 0.1;
        }

        view1.setCenter(rect1_pos_x, 320);

        window.clear(Color::Black);
        window.setView(view1);
        niebo.setPosition(rect1_pos_x - win_width/2, 0);
        window.draw(niebo);
        for(int x = -1; x < 2; x++) {
            pagorek.setPosition(rect1_pos_x * 0.6 + 640 * x, 0);
            window.draw(pagorek);
            continue;
        }

        for(int x = 0; x < trawa_count; x++) {
            trawa.setPosition(trawa_pos_x[x],trawa_pos_y[x]);
            window.draw(trawa);
        }
        rect1.setPosition(rect1_pos_x, rect1_pos_y);
        window.draw(rect1);
        window.display();

    }

    return 0;
}