Wednesday, December 29, 2010

Code::Blocks(4) C++ SDL and Life "engine.cpp"

Here is the code for the engine class implementation, just copy and paste into file engine.cpp in the project, then save the project:

#include "engine.h"

Engine::Engine()//Create the class and assign default values
{

SDL_Init( SDL_INIT_VIDEO ); //We start SDL, just video at the moment

screen=NULL;
tileset=NULL;

SDL_WM_SetCaption( "Life Game - Tile test", NULL ); //Caption of the window

SDL_ShowCursor(SDL_DISABLE); // hide system mouse

TileSize =50; // size of the default tile 50 pixels x 50 pixels

ScreenX=800; //screen width
ScreenY=600; //screen height
bpp=32; //screen bpp

StartTick = SDL_GetTicks();//Initialize timer
Frames=0; //Initialize frames = 0
}

Engine::~Engine()//Destructor
{
    //Free all the surfaces
    if (screen!=NULL)SDL_FreeSurface(screen); //Free screen surface
    if (tileset!=NULL)SDL_FreeSurface(tileset); //Free tileset surface

    SDL_Quit(); //Close SDL
}

void Engine::SetVga() // set video mode
{
screen = SDL_SetVideoMode(ScreenX, ScreenY, bpp,SDL_SWSURFACE|SDL_DOUBLEBUF);
/* It will set up a windowed video mode (width=screenx, height = screeny, bpp = bpp)
if we want to use a fullscreen mode we have to add
"|SDL_FULLSCREEN" after SDL_DOUBLEBUF  */
}

void Engine::FillColour(Uint8 r, Uint8 g, Uint8 b)//Fill the screen with a colour
{
    SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, r, g, b));// r-ed, g-reen,b-lue
}

void Engine::Flip()//flips backbuffer into primary buffer(screen)
{
    SDL_Flip(screen);
}

void Engine::LoadTileset() //loads an image into a memory (tileset), assigns the colorkey
{
    SDL_Surface* TmpSurface = NULL; //Temporary surface for loading
    TmpSurface = IMG_Load( "tileset.png"); //Load the image into a temporary surface
    if( TmpSurface != NULL )
    {
        tileset= SDL_DisplayFormat( TmpSurface );//optimize surface
        SDL_FreeSurface( TmpSurface); //free temporary surface
    }
    SDL_SetColorKey(tileset,SDL_SRCCOLORKEY | SDL_RLEACCEL,SDL_MapRGB(screen -> format, 255, 0, 255)); //set the color key
}

void Engine::UpdateMouse()
{
MouseButtons = SDL_GetMouseState(&MouseX, &MouseY); //Update mouse state
SDL_Rect start,end;
//set the cliping for the source surface (the tileset)
start.x= 200;
start.y=0;
start.w=TileSize;
start.h=TileSize;
//set the cliping for the destination surface (the screen)
end.x = MouseX;
end.y = MouseY;
end.w = TileSize;
end.h = TileSize;
SDL_BlitSurface(tileset, &start, screen, &end); //Blits the mouse pointer into the screen
}

void Engine::BlitTileset(int x, int y, int tile) //Blits a tile from our tileset to the screen
{
SDL_Rect start,end;
//set the cliping for the source surface (the tileset)
start.x= tile*TileSize;
start.y=0;
start.w=TileSize;
start.h=TileSize;
//set the cliping for the destination surface (the screen)
end.x = (x-1)*TileSize;
end.y = (y-1)*TileSize;
end.w = TileSize;
end.h = TileSize;
SDL_BlitSurface(tileset, &start, screen, &end); //Blits a tile from our tileset to the screen
}

void Engine::Wait(Uint32 ms) //Just pause for ms miliseconds
{
    SDL_Delay(ms);
}

int Engine::TimeElapsed() //Count time elapsed
{
    return SDL_GetTicks() - StartTick;
}

void Engine::UpdateTimer() //Reset time counter
{
    StartTick = SDL_GetTicks();
}

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