Hello folks,
I recently started looking for a C++ Multimedia library and decided to give SFML a try. I have built SFML on Xubuntu 14.04 utilizing Cmake according to official websites instructions. So far so good. I have now implemented a very basic version of the first code example given in the book 'SFML game developement', which is a circle moving about when one of the 'wasd' keys is pressed.
Now this does work, however, since I have not attempted to regulate the circle's speed, I would have expected it to move very rapidly. In reality it takes about 20 seconds for the circle to cross my screen.
I guess the program is very crudely implemented, also I do not have a dedicated graphics-card (my laptop has an Intel 4400 built in). Still I can't believe this sort of behavior is to be expected. I actually compiled the same program on another laptop running arch and the framerate increased about a hundredfold.
Is there anything I might be missing?
Here's the code, pretty much straight from the book.
//The game.h header
class Game
{
public:
Game();
void run();
private:
void processEvents();
void handlePlayerInput(sf::Keyboard::Key, bool);
void update();
void render();
sf::RenderWindow mWindow;
sf::CircleShape mPlayer;
bool mIsMovingUp;
bool mIsMovingDown;
bool mIsMovingLeft;
bool mIsMovingRight;
};
//The implementation
#include<SFML/Graphics.hpp>
#include "game.h"
Game::Game()
: mWindow(sf::VideoMode(640, 480), "SFML Application")
, mIsMovingUp(false), mIsMovingDown(false), mIsMovingLeft(false), mIsMovingRight(false)
, mPlayer()
{
mWindow.setKeyRepeatEnabled(false);
mPlayer.setRadius(40.f);
mPlayer.setPosition(100.f, 100.f);
mPlayer.setFillColor(sf::Color::Cyan);
}
void Game::run()
{
while (mWindow.isOpen())
{
processEvents();
update();
render();
}
}
void Game::render()
{
mWindow.clear();
mWindow.draw(mPlayer);
mWindow.display();
}
void Game::processEvents()
{
static sf::Event event;
if (mWindow.pollEvent(event))
{
switch (event.type)
{
case sf::Event::KeyPressed:
handlePlayerInput(event.key.code, true);
break;
case sf::Event::KeyReleased:
handlePlayerInput(event.key.code, false);
break;
case sf::Event::Closed:
mWindow.close();
break;
}
}
}
void Game::handlePlayerInput(sf::Keyboard::Key key, bool isPressed)
{
if (key == sf::Keyboard::W)
mIsMovingUp = isPressed;
else if (key == sf::Keyboard::S)
mIsMovingDown = isPressed;
else if (key == sf::Keyboard::A)
mIsMovingLeft = isPressed;
else if (key == sf::Keyboard::D)
mIsMovingRight = isPressed;
}
void Game::update()
{
sf::Vector2f movement(0.f, 0.f);
if (mIsMovingUp)
movement.y -= 1.0f;
if (mIsMovingDown)
movement.y += 1.0f;
if (mIsMovingLeft)
movement.x -= 1.0f;
if (mIsMovingRight)
movement.x += 1.0f;
mPlayer.move(movement);
}
//The main function
#include <SFML/Graphics.hpp>
#include "game.h"
int main()
{
Game game;
game.run();
return 0;
}
