Topics

1

General / Incrementing a variable when pushing a button

« on: October 05, 2010, 06:33:15 am »

I'm trying to create an asteroids game clone, and I'm stuck on creating the bullets. I'm pretty sure I've isolated the problem to being when I push space and increment the variable, numberofbullets, that's when the program crashes. When I removed incrementing the variable in that if statement, the program ran fine, the only problem was I only had one bullet being drawn over and over again. Here's the code:

Code: [Select]


#include <SFML/Graphics.hpp>
#include <iostream>
using namespace std;

#include "Bullet.h"
#include "Ship.h"

int main()
{
// Create the main rendering window
    sf::RenderWindow App(sf::VideoMode(800, 600, 32), "Asteroid Clone");

//Loading ship image
Ship ship1;
ship1.loadImage("ship.png");
Bullet bullet[10]; //Bullet array, will make it larger when I get bullets working

int numberofbullets = 0; // Index to count array of bullets
int i;

while(App.IsOpened())
{
sf::Event Event;

while (App.GetEvent(Event))
        {
            // Close window : exit
            if (Event.Type == sf::Event::Closed)
                App.Close();
        }

if(App.GetInput().IsKeyDown(sf::Key::Up))
ship1.moveForward(App);
if(App.GetInput().IsKeyDown(sf::Key::Right))
ship1.rotateRight(App);
if(App.GetInput().IsKeyDown(sf::Key::Left))
ship1.rotateLeft(App);
if(App.GetInput().IsKeyDown(sf::Key::Space))
{
bullet[numberofbullets].SetPosition(ship1); //Set position of bullet  based on ship
numberofbullets++; // Incrementing so next time player presses space a new bullet is made
}
App.Clear(sf::Color(0, 0, 0));

//Drawing of sprites
ship1.drawShip(App);
for(i=0; i <= numberofbullets; i++) // Draws number of bullets that have been made
{
bullet[numberofbullets].draw(App);
}
if (numberofbullets == 10) // Resets array, will make larger when I get it working
{
numberofbullets = 0;
}


App.Display();

}

return EXIT_SUCCESS;
}



2

Graphics / Nothing is being drawn in my window, may be due to classes

« on: October 02, 2010, 05:54:46 am »

I'm trying to put together an asteroid clone, but nothing's being drawn in my window. I was going through the tutorials, and was able to load a sprite image, display it on the screen, and get keyboard input to get the sprite to move. Then I started a new project. The only thing I did different was make a class called Ship for the ship in the asteroids game.

To make sure I installed SFML 1.6 correctly, I copied and pasted the source code from the project I made from the tutorials, and it was able to display the sprite. Here's my source code:

main.cpp

Code: [Select]


/*
 * Headers, will add later
 */
#include <SFML/Graphics.hpp>
#include "Ship.h"

int main()
{
// Create the main rendering window
    sf::RenderWindow App(sf::VideoMode(800, 600, 32), "Asteroid Clone");

//Loading ship image
Ship ship1;
ship1.loadImage("ship.png");

while(App.IsOpened())
{
sf::Event Event;

while (App.GetEvent(Event))
        {
            // Close window : exit
            if (Event.Type == sf::Event::Closed)
                App.Close();
        }

if(App.GetInput().IsKeyDown(sf::Key::Up))
ship1.moveForward(App);
if(App.GetInput().IsKeyDown(sf::Key::Right))
ship1.rotateRight(App);
if(App.GetInput().IsKeyDown(sf::Key::Left))
ship1.rotateLeft(App);
}

App.Clear(sf::Color(0, 0, 0));

//Drawing of sprites
ship1.drawShip(App);

App.Display();

return EXIT_SUCCESS;
}


Ship.h

Code: [Select]


/*
 * Ship.h
 * Header file for the ship in the asteroids game
 */

#include <SFML/Graphics.hpp>
#include <string>

using namespace std;

class Ship
{
public:

void loadImage(string imagefilename); // Function loads image and turns it into a sprite
void rotateRight(sf::RenderWindow &game);
void rotateLeft(sf::RenderWindow &game);
void moveForward(sf::RenderWindow &game);
void drawShip(sf::RenderWindow &game);

private:

sf::Sprite shipSprite;
float directionfacingX;
float directionfacingY;
};


Ship.cpp

Code: [Select]


/*
 * Ship.cpp
 * Implementation file for the Ship class
 */

#include <SFML/Graphics.hpp>
#include <string>
#include <cmath>
#include <iostream>

using namespace std;

#include "Ship.h"

// This function loads an image, then converts it to a sprite
void Ship::loadImage(string imagefilename)
{
sf::Image Image;
if (!Image.LoadFromFile(imagefilename))
cout << "Error loading file" << endl;
shipSprite.SetImage(Image);

directionfacingX = 0.0;
directionfacingY = 0.0;

shipSprite.SetColor(sf::Color(0,255,255,128));
shipSprite.SetCenter(10,10);

}

// Used when right arrow key is hit
// Rotates the image and sets new X and Y for movement
void Ship::rotateRight(sf::RenderWindow &game)
{
float ElapsedTime = game.GetFrameTime();
shipSprite.Rotate(-100 * ElapsedTime);

directionfacingX = cos((shipSprite.GetRotation()*3.14)/180);
directionfacingY = sin((shipSprite.GetRotation()*3.14)/180);
}

// Used when left arrow key is hit
// Rotates the image and sets new X and Y for movement
void Ship::rotateLeft(sf::RenderWindow &game)
{
float ElapsedTime = game.GetFrameTime();
shipSprite.Rotate(+100 * ElapsedTime);

directionfacingX = cos((shipSprite.GetRotation()*3.14)/180);
directionfacingY = sin((shipSprite.GetRotation()*3.14)/180);
}

void Ship::moveForward(sf::RenderWindow &game)
{
float ElapsedTime = game.GetFrameTime();
shipSprite.Move(directionfacingX, directionfacingY);
}

void Ship::drawShip(sf::RenderWindow &game)
{
game.Draw(shipSprite);
}


3

General / Having trouble loading an image

« on: September 26, 2010, 03:11:00 am »

I'm getting strange errors in Visual Studio 2010 when running the "Display a Sprite" tutorial. I'm able to run the "Using rendering windows" sample program, but the title of the window it produces isn't "SFML Graphics". It has some strange characters before SFML.

But when I try to run the "Display a Sprite" tutorial, the program starts beeping and then it stops responding. The console window also displays a lot of weird characters.

Since I can run the "Using rendering windows" sample program, I don't think this error has to do with installing SFML, but correct me if I'm wrong.

And the sprite I'm trying to load is a triangle I drew in paint and saved it as a .png.

Can anyone help me?