Basic Galaxy Shooter - 1

#include"SFML\Graphics.hpp"

const int VELO=20; //velocity of bullet
class Bullets
{
public:
  sf::IntRect box; // to represent bullet’s dimension
  sf::RectangleShape rect; // to draw bullet as a rectangle
  int yVel; // bullet’s y velocity

  Bullets(int x,int y); // constructor to specify position of bullet w.r.t ship
	
  void update();  // update fired bullets
  void display(sf::RenderWindow *window); // draw the fired bullets

};

Bullets::Bullets(int x, int y)
{
  box.left=x;
  box.top=y;
  box.height=10; // height of bullet
  box.width=2; // width of bullet
	
  rect.setSize(sf::Vector2f(box.width,box.height)); //set the dim of drawable rect
  rect.setFillColor(sf::Color::Blue); // set blue color for the bullet rect
	
  yVel=-VELO; // bullets move upwards. So negative y velocity
}

void Bullets::update()
{
  box.top+=yVel; // bullet’s y values are updated; x values remain same
}

void Bullets::display(sf::RenderWindow *window)
{
  rect.setPosition(box.left,box.top); // set the position of rect to draw as bullet
  window->draw(rect); // display bullet
}

#include"SFML\Graphics.hpp"
#include"Bullets.h"

const int VEL=10;//Velocity with which ship will move i.e. 10 pixels
class HeroShip
{
public:
  sf::IntRect box; // a box to store the dimensions i.e.x,y,width and height of ship
  sf::RectangleShape rect; //rectangle shape that is displayed
  int xVel,yVel; // variables to store horizontal and vertical velocity
	
  Bullets *myBullets[20]; // array of bullet ptr objects; 20 Bullets to fire 
  int num_of_bullets;  // to keep track of how many bullets have been fired

  HeroShip(); // constructor
  void handleEvents();  // to get input from user
  void update();  // to update values
  void display(sf::RenderWindow *window);  //to display values
  void shoot();  //if user wants to shoot a bullet

};

HeroShip::HeroShip()
{
  box.left=200; // ship’s initial position is (200,500) on screen
  box.top=500;
  box.height=20; // height and weight of ship is 20x20
  box.width=20;
	
  rect.setSize(sf::Vector2f(box.width,box.height)); //dimension of rect to display
  rect.setFillColor(sf::Color::Red);  // color of the ship
	
  xVel=0; // initially x and y velocity are 0
  yVel=0;

  num_of_bullets=0; // initially bullets fired is 0
}
void HeroShip::handleEvents()
{
  //top or down
  if(sf::Keyboard::isKeyPressed(sf::Keyboard::Up))
    yVel=-VEL;
  else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Down))
    yVel=VEL;
  else
    yVel=0;
  //left or right
  if(sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
    xVel=-VEL;
  else if(sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
    xVel=VEL;
  else
    xVel=0;
  // if Z key is pressed shoot func is called which fires a bullet
  if(sf::Keyboard::isKeyPressed(sf::Keyboard::Z))
    shoot();
	
}

void HeroShip::update()
{
  //update values
  box.left+=xVel;
  box.top+=yVel;
  //update the position of fired bullets
  for(int i=0;i<num_of_bullets;i++)
    myBullets[i]->update();
}

void HeroShip::display(sf::RenderWindow *window)
{
  //display the fired bullets
  for(int i=0;i<num_of_bullets;i++)
	  myBullets[i]->display(window);
	
  //set the x,y values of the rectangle i.e. ship to be displayed
  rect.setPosition(box.left,box.top);
  window->draw(rect); // draw on the window
}

void HeroShip::shoot()
{
  if(num_of_bullets<20)
  {
    // creates a new bullet
    myBullets[num_of_bullets]=new Bullets(box.left+box.width/2,box.top-10);
    num_of_bullets++; // increment the bullet counter
  }
}

#include <SFML/Graphics.hpp>
#include"HeroShip.h"

int main()
{
    // Create the main window to display 
    sf::RenderWindow *window;
    window=new sf::RenderWindow(sf::VideoMode(800, 600), "SFML window");
    window->setFramerateLimit(20);
    //Create the ship
    HeroShip *myship=new HeroShip();
    //Open the game loop
    while (window->isOpen())
    {
        sf::Event event;
        while (window->pollEvent(event))
        {
            // Close window : exit
            if (event.type == sf::Event::Closed)
                window->close();
        }
 	
       //Get input from user
        myship->handleEvents();
        //Update ship’s values
        myship->update();
	 
       // Clear screen
        window->clear();
       //display stuff
       myship->display(window);
//finally display the window on screen
       window->display();
    }
    return 0;
}