Topics

1

SFML projects / My current project using SFML

« on: January 25, 2013, 09:27:25 am »

Hello!

Wanted to share the current project I am working on entitled The Dungeon 2: The Key of Antioch.  Its a sequel to the first Dungeon, and the demo is really just a playable mini game of an aspect of the whole project.  Since I hit a milestone I thought it might be cool to whip up a little game and demonstrate what I have been working on.

So...

Take a gander at my web page, and download!

2

Graphics / Using the Alpha Value embedded in an image file

« on: January 22, 2013, 06:00:46 pm »

Hello,
How do I render an image that has RGBA values?  I would like to utilize the transparency i created in my paint program, but i am unsure how to use OpenGL. I know that there is a blend mode, and that utilization of OpenGL is simple in SFML since OpenGL is the backend, but i'm not sure which blend mode, or which function i should use.

I added this code after the ceation of my window:

sf::RenderWindow window(sf::VideoMode(800, 600, 32), "SFML works!");

        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_DST_COLOR);
        window.pushGLStates();
 

If somebody has a link to a tutorial that would be awesome as I don't even know what this is called. 

3

Graphics / sf::Text Disappearing after displaying once

« on: December 20, 2012, 02:31:14 am »

Hello,

I am trying to display the frame rate of my loop, but the text keeps disappearing after displaying once.  Here is my initialization code:

    sf::Text text("hello");
        text.setFont(sf::Font::getDefaultFont());
        text.setCharacterSize(30);
        text.setStyle(sf::Text::Bold);
        text.setColor(sf::Color::Red);
        text.setPosition(10,10);
 

and the draw code:

        textcoords = text.getPosition();
                text.setPosition(window.convertCoords(sf::Vector2<int>((int)textcoords.x, (int)textcoords.y)));
                End = clock.getElapsedTime();
                ElapsedTime = (End.asMilliseconds() - Start.asMilliseconds())/1000;
                text.setString(ElapsedTime);
                window.draw(text);
 

I am under the impression that I need to convert the coordinates to local space, and I think I am doing this correctly. 

Thanks for the help.

Patrick

4

Graphics / Releasing the Texture

« on: December 17, 2012, 04:57:41 am »

Hello,

Lets say that I want to reuse the same texture object, but load anther texture from memory.  If I load another from memory, does the function release the existing texture?

sf::Texture t;
t.loadFromFile("pic.bmp");

//...stuff

t.loadFromFile("pic2.bmp");
 

does the second call to sf::Texture::loadFromFile(...) release the existing texture in memory?

Patrick

5

Graphics / Drawing sprites :-\

« on: December 12, 2012, 04:29:46 am »

Hello,

I am trying to draw a sprite array, but the screen comes white with no textures.  I'm wondering what I am doing wring:

#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include <fstream>
#include <iostream>



int main()
{
        std::ifstream file("hills.map");
        if(!file.good())
        {
                std::cout<<"failed to load map."<<std::endl;
                return 0 ;
        }
        int width = 0;
        int length = 0;

        file>>width;
        file>>length;

        char** Map = new char*[width];
        for(int i = 0; i < length; i++)
        {
                Map[i] = new char[length];
        }

        for(int x = 0; x < width; x++)
        {
                for(int y = 0; y < length; y++)
                {
                        Map[x][y] = file.get();
                }

                file.get(); //get the \n character
        }

        sf::Sprite** SpriteArray = new sf::Sprite*[width];
        for(int x = 0; x < width; x++)
        {
                SpriteArray[x] = new sf::Sprite[length];
        }

        //load the sprites into memory

        sf::Texture grass;
        sf::Texture road;

        if(!grass.loadFromFile("grass.png"))
                std::cout<<"failed to load grass from file."<<std::endl;

        if(!road.loadFromFile("road.png"))
                std::cout<<"Failed to load road from file."<<std::endl;

        for(int x = 0; x < width; x++)
        {
                for(int y = 0; y < length; y++)
                {
                        if(Map[x][y] == '#')
                                SpriteArray[x][y].setTexture(grass);
                        else
                                SpriteArray[x][y].setTexture(road);

                        SpriteArray[x][y].setPosition(float(x*64), float(y*64));
                }
        }


        file.close();

    sf::RenderWindow window(sf::VideoMode(800, 800), "SFML works!");
       
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

                //clear the backbuffer
        window.clear();

                sf::Sprite t;
                //draw stuff
                for(int x = 0; x < width; x++)
                {
                        for(int y = 0; y < length; y++)
                        {
                                t = SpriteArray[x][y];
                                window.draw(t);
                        }
                }

                //display the contents
        window.display();
    }

        //free the memory that the program used
        for(int x = 0; x < width; x++)
        {
                delete[] Map[x];
                delete[] SpriteArray[x];
        }
        delete[] Map;
        delete[] SpriteArray;

    return 0;
}
 

thanks for any help you can provide.