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C-/C++-Quelltext

   //Load the files
    if( load_files() == false )
    {
        return 1;
    }

C-/C++-Quelltext

/*This source code copyrighted by Lazy Foo' Productions (2004-2013)
and may not be redistributed without written permission.*/

//The headers
#include "SDL.h"
#include "SDL_image.h"
#include <string>
#include <fstream>

//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//The frame rate
const int FRAMES_PER_SECOND = 20;

//The dot dimensions
const int DOT_WIDTH = 20;
const int DOT_HEIGHT = 20;

//The dimensions of the level
const int LEVEL_WIDTH = 1280;
const int LEVEL_HEIGHT = 960;

//Tile constants
const int TILE_WIDTH = 80;
const int TILE_HEIGHT = 80;
const int TOTAL_TILES = 192;
const int TILE_SPRITES = 12;

//The different tile sprites
const int TILE_RED = 0;
const int TILE_GREEN = 1;
const int TILE_BLUE = 2;
const int TILE_CENTER = 3;
const int TILE_TOP = 4;
const int TILE_TOPRIGHT = 5;
const int TILE_RIGHT = 6;
const int TILE_BOTTOMRIGHT = 7;
const int TILE_BOTTOM = 8;
const int TILE_BOTTOMLEFT = 9;
const int TILE_LEFT = 10;
const int TILE_TOPLEFT = 11;

//The surfaces
SDL_Surface *dot = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *tileSheet = NULL;

//Sprite from the tile sheet
SDL_Rect clips[ TILE_SPRITES ];

//The event structure
SDL_Event event;

//The camera
SDL_Rect camera = { 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT };

//The tile
class Tile
{
    private:
    //The attributes of the tile
    SDL_Rect box;

    //The tile type
    int type;

    public:
    //Initializes the variables
    Tile( int x, int y, int tileType );

    //Shows the tile
    void show();

    //Get the tile type
    int get_type();

    //Get the collision box
    SDL_Rect get_box();
};

//The dot
class Dot
{
    private:
    //The dot's collision box
    SDL_Rect box;

    //The velocity of the dot
    int xVel, yVel;

    public:
    //Initializes the variables
    Dot();

    //Takes key presses and adjusts the dot's velocity
    void handle_input();

    //Moves the dot
    void move( Tile *tiles[] );

    //Shows the dot on the screen
    void show();

    //Sets the camera over the dot
    void set_camera();
};

//The timer
class Timer
{
    private:
    //The clock time when the timer started
    int startTicks;

    //The ticks stored when the timer was paused
    int pausedTicks;

    //The timer status
    bool paused;
    bool started;

    public:
    //Initializes variables
    Timer();

    //The various clock actions
    void start();
    void stop();
    void pause();
    void unpause();

    //Gets the timer's time
    int get_ticks();

    //Checks the status of the timer
    bool is_started();
    bool is_paused();
};

SDL_Surface *load_image( std::string filename )
{
    //The image that's loaded
    SDL_Surface* loadedImage = NULL;

    //The optimized surface that will be used
    SDL_Surface* optimizedImage = NULL;

    //Load the image
    loadedImage = IMG_Load( filename.c_str() );

    //If the image loaded
    if( loadedImage != NULL )
    {
        //Create an optimized surface
        optimizedImage = SDL_DisplayFormat( loadedImage );

        //Free the old surface
        SDL_FreeSurface( loadedImage );

        //If the surface was optimized
        if( optimizedImage != NULL )
        {
            //Color key surface
            SDL_SetColorKey( optimizedImage, SDL_SRCCOLORKEY, SDL_MapRGB( optimizedImage->format, 0, 0xFF, 0xFF ) );
        }
    }

    //Return the optimized surface
    return optimizedImage;
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
    //Holds offsets
    SDL_Rect offset;

    //Get offsets
    offset.x = x;
    offset.y = y;

    //Blit
    SDL_BlitSurface( source, clip, destination, &offset );
}

bool check_collision( SDL_Rect A, SDL_Rect B )
{
    //The sides of the rectangles
    int leftA, leftB;
    int rightA, rightB;
    int topA, topB;
    int bottomA, bottomB;

    //Calculate the sides of rect A
    leftA = A.x;
    rightA = A.x + A.w;
    topA = A.y;
    bottomA = A.y + A.h;

    //Calculate the sides of rect B
    leftB = B.x;
    rightB = B.x + B.w;
    topB = B.y;
    bottomB = B.y + B.h;

    //If any of the sides from A are outside of B
    if( bottomA <= topB )
    {
        return false;
    }

    if( topA >= bottomB )
    {
        return false;
    }

    if( rightA <= leftB )
    {
        return false;
    }

    if( leftA >= rightB )
    {
        return false;
    }

    //If none of the sides from A are outside B
    return true;
}

bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;
    }

    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

    //If there was an error in setting up the screen
    if( screen == NULL )
    {
        return false;
    }

    //Set the window caption
    SDL_WM_SetCaption( "Move the Dot", NULL );

    //If everything initialized fine
    return true;
}

bool load_files()
{
    //Load the dot image
    dot = load_image("Data/dot.bmp");

    //If there was a problem in loading the dot
    if( dot == NULL )
    {
        return false;
    }

    //Load the tile sheet
    tileSheet = load_image("Data/tiles.bmp");

    //If there was a problem in loading the tiles
    if( tileSheet == NULL )
    {
        return false;
    }

    //If everything loaded fine
    return true;
}

void clean_up( Tile *tiles[] )
{
    //Free the surfaces
    SDL_FreeSurface( dot );
    SDL_FreeSurface( tileSheet );

    //Free the tiles
    for( int t = 0; t < TOTAL_TILES; t++ )
    {
        delete tiles[ t ];
    }

    //Quit SDL
    SDL_Quit();
}

void clip_tiles()
{
    //Clip the sprite sheet
    clips[ TILE_RED ].x = 0;
    clips[ TILE_RED ].y = 0;
    clips[ TILE_RED ].w = TILE_WIDTH;
    clips[ TILE_RED ].h = TILE_HEIGHT;

    clips[ TILE_GREEN ].x = 0;
    clips[ TILE_GREEN ].y = 80;
    clips[ TILE_GREEN ].w = TILE_WIDTH;
    clips[ TILE_GREEN ].h = TILE_HEIGHT;

    clips[ TILE_BLUE ].x = 0;
    clips[ TILE_BLUE ].y = 160;
    clips[ TILE_BLUE ].w = TILE_WIDTH;
    clips[ TILE_BLUE ].h = TILE_HEIGHT;

    clips[ TILE_TOPLEFT ].x = 80;
    clips[ TILE_TOPLEFT ].y = 0;
    clips[ TILE_TOPLEFT ].w = TILE_WIDTH;
    clips[ TILE_TOPLEFT ].h = TILE_HEIGHT;

    clips[ TILE_LEFT ].x = 80;
    clips[ TILE_LEFT ].y = 80;
    clips[ TILE_LEFT ].w = TILE_WIDTH;
    clips[ TILE_LEFT ].h = TILE_HEIGHT;

    clips[ TILE_BOTTOMLEFT ].x = 80;
    clips[ TILE_BOTTOMLEFT ].y = 160;
    clips[ TILE_BOTTOMLEFT ].w = TILE_WIDTH;
    clips[ TILE_BOTTOMLEFT ].h = TILE_HEIGHT;

    clips[ TILE_TOP ].x = 160;
    clips[ TILE_TOP ].y = 0;
    clips[ TILE_TOP ].w = TILE_WIDTH;
    clips[ TILE_TOP ].h = TILE_HEIGHT;

    clips[ TILE_CENTER ].x = 160;
    clips[ TILE_CENTER ].y = 80;
    clips[ TILE_CENTER ].w = TILE_WIDTH;
    clips[ TILE_CENTER ].h = TILE_HEIGHT;

    clips[ TILE_BOTTOM ].x = 160;
    clips[ TILE_BOTTOM ].y = 160;
    clips[ TILE_BOTTOM ].w = TILE_WIDTH;
    clips[ TILE_BOTTOM ].h = TILE_HEIGHT;

    clips[ TILE_TOPRIGHT ].x = 240;
    clips[ TILE_TOPRIGHT ].y = 0;
    clips[ TILE_TOPRIGHT ].w = TILE_WIDTH;
    clips[ TILE_TOPRIGHT ].h = TILE_HEIGHT;

    clips[ TILE_RIGHT ].x = 240;
    clips[ TILE_RIGHT ].y = 80;
    clips[ TILE_RIGHT ].w = TILE_WIDTH;
    clips[ TILE_RIGHT ].h = TILE_HEIGHT;

    clips[ TILE_BOTTOMRIGHT ].x = 240;
    clips[ TILE_BOTTOMRIGHT ].y = 160;
    clips[ TILE_BOTTOMRIGHT ].w = TILE_WIDTH;
    clips[ TILE_BOTTOMRIGHT ].h = TILE_HEIGHT;
}

bool set_tiles( Tile *tiles[] )
{
    //The tile offsets
    int x = 0, y = 0;

    //Open the map
    std::ifstream map("Data/lazy.map");

    //If the map couldn't be loaded
    if( map == NULL )
    {
        return false;
    }

    //Initialize the tiles
    for( int t = 0; t < TOTAL_TILES; t++ )
    {
        //Determines what kind of tile will be made
        int tileType = -1;

        //Read tile from map file
        map >> tileType;

        //If the was a problem in reading the map
        if( map.fail() == true )
        {
            //Stop loading map
            map.close();
            return false;
        }

        //If the number is a valid tile number
        if( ( tileType >= 0 ) && ( tileType < TILE_SPRITES ) )
        {
            tiles[ t ] = new Tile( x, y, tileType );
        }
        //If we don't recognize the tile type
        else
        {
            //Stop loading map
            map.close();
            return false;
        }

        //Move to next tile spot
        x += TILE_WIDTH;

        //If we've gone too far
        if( x >= LEVEL_WIDTH )
        {
            //Move back
            x = 0;

            //Move to the next row
            y += TILE_HEIGHT;
        }
    }

    //Close the file
    map.close();

    //If the map was loaded fine
    return true;
}

bool touches_wall( SDL_Rect box, Tile *tiles[] )
{
    //Go through the tiles
    for( int t = 0; t < TOTAL_TILES; t++ )
    {
        //If the tile is a wall type tile
        if( ( tiles[ t ]->get_type() >= TILE_CENTER ) && ( tiles[ t ]->get_type() <= TILE_TOPLEFT ) )
        {
            //If the collision box touches the wall tile
            if( check_collision( box, tiles[ t ]->get_box() ) == true )
            {
                return true;
            }
        }
    }

    //If no wall tiles were touched
    return false;
}

Tile::Tile( int x, int y, int tileType )
{
    //Get the offsets
    box.x = x;
    box.y = y;

    //Set the collision box
    box.w = TILE_WIDTH;
    box.h = TILE_HEIGHT;

    //Get the tile type
    type = tileType;
}

void Tile::show()
{
    //If the tile is on screen
    if( check_collision( camera, box ) == true )
    {
        //Show the tile
        apply_surface( box.x - camera.x, box.y - camera.y, tileSheet, screen, &clips[ type ] );
    }
}

int Tile::get_type()
{
    return type;
}

SDL_Rect Tile::get_box()
{
    return box;
}

Dot::Dot()
{
    //Initialize the offsets
    box.x = 0;
    box.y = 0;
    box.w = DOT_WIDTH;
    box.h = DOT_HEIGHT;

    //Initialize the velocity
    xVel = 0;
    yVel = 0;
}

void Dot::handle_input()
{
    //If a key was pressed
    if( event.type == SDL_KEYDOWN )
    {
        //Adjust the velocity
        switch( event.key.keysym.sym )
        {
            case SDLK_UP: yVel -= DOT_HEIGHT / 2; break;
            case SDLK_DOWN: yVel += DOT_HEIGHT / 2; break;
            case SDLK_LEFT: xVel -= DOT_WIDTH / 2; break;
            case SDLK_RIGHT: xVel += DOT_WIDTH / 2; break;
        }
    }
    //If a key was released
    else if( event.type == SDL_KEYUP )
    {
        //Adjust the velocity
        switch( event.key.keysym.sym )
        {
            case SDLK_UP: yVel += DOT_HEIGHT / 2; break;
            case SDLK_DOWN: yVel -= DOT_HEIGHT / 2; break;
            case SDLK_LEFT: xVel += DOT_WIDTH / 2; break;
            case SDLK_RIGHT: xVel -= DOT_WIDTH / 2; break;
        }
    }
}

void Dot::move( Tile *tiles[] )
{
    //Move the dot left or right
    box.x += xVel;

    //If the dot went too far to the left or right or touched a wall
    if( ( box.x < 0 ) || ( box.x + DOT_WIDTH > LEVEL_WIDTH ) || touches_wall( box, tiles ) )
    {
        //move back
        box.x -= xVel;
    }

    //Move the dot up or down
    box.y += yVel;

    //If the dot went too far up or down or touched a wall
    if( ( box.y < 0 ) || ( box.y + DOT_HEIGHT > LEVEL_HEIGHT ) || touches_wall( box, tiles ) )
    {
        //move back
        box.y -= yVel;
    }
}

void Dot::show()
{
    //Show the dot
    apply_surface( box.x - camera.x, box.y - camera.y, dot, screen );
}

void Dot::set_camera()
{
    //Center the camera over the dot
    camera.x = ( box.x + DOT_WIDTH / 2 ) - SCREEN_WIDTH / 2;
    camera.y = ( box.y + DOT_HEIGHT / 2 ) - SCREEN_HEIGHT / 2;

    //Keep the camera in bounds.
    if( camera.x < 0 )
    {
        camera.x = 0;
    }
    if( camera.y < 0 )
    {
        camera.y = 0;
    }
    if( camera.x > LEVEL_WIDTH - camera.w )
    {
        camera.x = LEVEL_WIDTH - camera.w;
    }
    if( camera.y > LEVEL_HEIGHT - camera.h )
    {
        camera.y = LEVEL_HEIGHT - camera.h;
    }
}

Timer::Timer()
{
    //Initialize the variables
    startTicks = 0;
    pausedTicks = 0;
    paused = false;
    started = false;
}

void Timer::start()
{
    //Start the timer
    started = true;

    //Unpause the timer
    paused = false;

    //Get the current clock time
    startTicks = SDL_GetTicks();
}

void Timer::stop()
{
    //Stop the timer
    started = false;

    //Unpause the timer
    paused = false;
}

void Timer::pause()
{
    //If the timer is running and isn't already paused
    if( ( started == true ) && ( paused == false ) )
    {
        //Pause the timer
        paused = true;

        //Calculate the paused ticks
        pausedTicks = SDL_GetTicks() - startTicks;
    }
}

void Timer::unpause()
{
    //If the timer is paused
    if( paused == true )
    {
        //Unpause the timer
        paused = false;

        //Reset the starting ticks
        startTicks = SDL_GetTicks() - pausedTicks;

        //Reset the paused ticks
        pausedTicks = 0;
    }
}

int Timer::get_ticks()
{
    //If the timer is running
    if( started == true )
    {
        //If the timer is paused
        if( paused == true )
        {
            //Return the number of ticks when the timer was paused
            return pausedTicks;
        }
        else
        {
            //Return the current time minus the start time
            return SDL_GetTicks() - startTicks;
        }
    }

    //If the timer isn't running
    return 0;
}

bool Timer::is_started()
{
    return started;
}

bool Timer::is_paused()
{
    return paused;
}

int main( int argc, char* args[] )
{
    //Quit flag
    bool quit = false;

    //The dot
    Dot myDot;

    //The tiles that will be used
    Tile *tiles[ TOTAL_TILES ];

    //The frame rate regulator
    Timer fps;

    //Initialize
    if( init() == false )
    {
        return 1;
    }

    //Load the files
    if( load_files() == false )
    {
        return 1;
    }

    //Clip the tile sheet
    clip_tiles();

    //Set the tiles
    if( set_tiles( tiles ) == false )
    {
        return 1;
    }

    //While the user hasn't quit
    while( quit == false )
    {
        //Start the frame timer
        fps.start();

        //While there's events to handle
        while( SDL_PollEvent( &event ) )
        {
            //Handle events for the dot
            myDot.handle_input();

            //If the user has Xed out the window
            if( event.type == SDL_QUIT )
            {
                //Quit the program
                quit = true;
            }
        }

        //Move the dot
        myDot.move( tiles );

        //Set the camera
        myDot.set_camera();

        //Show the tiles
        for( int t = 0; t < TOTAL_TILES; t++ )
        {
            tiles[ t ]->show();
        }

        //Show the dot on the screen
        myDot.show();

        //Update the screen
        if( SDL_Flip( screen ) == -1 )
        {
            return 1;
        }

        //Cap the frame rate
        if( fps.get_ticks() < 1000 / FRAMES_PER_SECOND )
        {
            SDL_Delay( ( 1000 / FRAMES_PER_SECOND ) - fps.get_ticks() );
        }
    }

    //Clean up
    clean_up( tiles );

    return 0;
}