Thread: Render text

Ok, i have a small problem here with rendering TrueTypeFont text. The thing is, i don't know where and how to do this that i want to.

I want it to display the points that the player have gathered. I know how to display the text but don't know how to make it show all the time. I don't know how to display a variable. Help me!

Code:

//The headers
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include <string>
#include <iostream>
#include <ctime> 
#include <cstdlib>

using namespace std;

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

//The surfaces
SDL_Surface *background = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *piece = NULL;
SDL_Surface *square = NULL;
SDL_Surface *message = NULL;

//The event structure
SDL_Event event;

//The font that's going to be used
TTF_Font *font = NULL;

//The color of the font
SDL_Color textColor = { 255, 255, 255 };

//The layers points and time
string points;

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 image was optimized just fine
        if( optimizedImage != NULL )
        {
            //Map the color key
            Uint32 colorkey = SDL_MapRGB( optimizedImage->format, 0x0, 0xff, 0xff );
            
            //Set all pixels of color R 0, G 0xFF, B 0xFF to be transparent
            SDL_SetColorKey( optimizedImage, SDL_RLEACCEL | SDL_SRCCOLORKEY, colorkey );
        }
    }
    
    //Return the optimized surface
    return optimizedImage;
}

SDL_Surface *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 );
    
    return 0;
}

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 in error in setting up the screen
    if( screen == NULL )
    {
        return false;    
    }
    
    //Initialize SDL_ttf
    if( TTF_Init() == -1 )
    {
        return false;    
    }
    
    //Set the window caption
    SDL_WM_SetCaption( "Beautiful day", NULL );
    
    //If everything initialized fine
    return true;
}

bool load_files()
{
    //Load the images
    background = load_image( "bg.png" );
    piece = load_image( "howto.png" );
    square = load_image( "square.png" );
    
    //Open the font
    font = TTF_OpenFont( "teen.ttf", 50 );
    
    //If there was a problem in loading the background
    if( background == NULL )
    {
        return false;    
    }
    
    //If there was a problem in loading the piece
    if( piece == NULL )
    {
        return false;    
    }
    
    //If there was a problem in loading the square
    if( square == NULL )
    {
        return false;    
    }
    
    //If everything loaded fine
    return true;
}

int clean_up()
{
    //Free the surfaces
    SDL_FreeSurface( background );
    SDL_FreeSurface( piece );
    SDL_FreeSurface( square );
    SDL_FreeSurface( message );
    
    //Close the font that was used
    TTF_CloseFont( font );
    
    //Quit SDL_ttf
    TTF_Quit();
    
    //Quit SDL
    SDL_Quit();
    
    return 0;
}

//Random number
int GetRand(int min, int max)
{
  static int Init = 0;
  int rc;
  
  if (Init == 0)
  {
    srand(time(NULL));
    Init = 1;
  }
  
  rc = (rand() % (max - min + 1) + min);
  return (rc);
}

//Check if there is a collision
bool check_coll( int sX, int sY, int pX, int pY )
{
    //Square's position
    int sXl = sX;
    int sXr = sX + 29;
    int sYl = sY;
    int sYr = sY + 29;
    
    //Piece's position
    int pXl = pX;
    int pXr = pX + 75;
    int pYl = pY;
    int pYr = pY + 148;
    
    //Check if you hit the square
    if ((pXr >= sXl && pXr < sXr) || (pXl <= sXr && pXl > sXl) || (sXl >= pXl && sXl <= pXr) || (sXr <= pXr && sXr >= pXl)) 
    {
             return true;
    }
    else
    {
        return false;
    }
}

//Move square if there is a collision
void move_and_show_square( int & sX, int sY, int pX, int pY )
{
     //If there is a collision
     if (check_coll( sX, sY, pX, pY ) == true)
     {
                     //Add points
                     points;
                     
                     //New position for the square
                     sX = GetRand(0,640);
                     
                     //Make the square move
                     SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00) );
                     apply_surface( 0, 0, background, screen );
                     piece = load_image( "piece.png" ); 
                     apply_surface( pX, pY, piece, screen ); 
     }
     
     //Apply the square
     apply_surface( sX, 300, square, screen );
}

int main( int argc, char* args[] )
{
    //The piece's coordinates
    int x = 200;
    int y = 200;
    
    //The square's coordinates
    int sX = 400;
    int sY = 300;
    
    //Left flag
    bool left = false;
    
    //Right flag
    bool right = false;
    
    //Quit flag
    bool quit = false;
    
    //Initialize
    if( init() == false )
    {
        return 1;
    }
    
    //Load the files
    if( load_files() == false )
    {
        return 1;
    }
    
    //Apply the background
    apply_surface( 0, 0, background, screen );
    
    //Render and apply the points
    message = TTF_RenderText_Solid( font, "1", textColor );
    apply_surface( 20, 0, message, screen );
    
    //Apply the piece
    apply_surface( 70, 178, piece, screen );
    
    //While the user hasn't quit
    while( quit == false )
    {  
        //If there's an event to handle
        while (SDL_PollEvent(&event))
        {
              if (event.type == SDL_KEYDOWN)
              {
                                switch(event.key.keysym.sym)
                                {
                                                               case SDLK_LEFT:
                                                                     left = true;
                                                                     break;
                                                                     
                                                               case SDLK_RIGHT:
                                                                     right = true;
                                                                     break;
                                                                     
                                                               case SDLK_ESCAPE:
                                                                    quit = true;
                                                                    break;
               }                 }
               
               if (event.type == SDL_KEYUP)
               {
                                 switch(event.key.keysym.sym)
                                 {
                                                                case SDLK_LEFT:
                                                                      left = false;
                                                                      SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00) );
                                                                      apply_surface( 0, 0, background, screen );
                                                                      piece = load_image( "piece.png" ); 
                                                                      apply_surface( x, y, piece, screen ); 
                                                                      break;
                                                                
                                                                case SDLK_RIGHT:
                                                                     right = false;
                                                                     SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00) ); 
                                                                     apply_surface( 0, 0, background, screen );
                                                                     piece = load_image( "piece.png" ); 
                                                                     apply_surface( x, y, piece, screen ); 
                                                                     break;
                                 }
               }      
               
            }
            
            //Check if the right is pressed
            if (right == true)
            {
                         x = x + 1; 
                         if (x == 565) {
                               x = x - 1;
                         }
                         SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00) ); 
                         apply_surface( 0, 0, background, screen );
                         piece = load_image( "piece-right.png" ); 
                         apply_surface( x, y, piece, screen ); 
            }
            
            //Check if the left is pressed
            if (left == true)
            {
                         x = x - 1; 
                         if (x == 0) {
                               x = x + 1;
                         }
                         SDL_FillRect( screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00) );
                         apply_surface( 0, 0, background, screen );
                         piece = load_image( "piece-left.png" ); 
                         apply_surface( x, y, piece, screen ); 
            }  
            
            //Check collision and move the square
            move_and_show_square(sX, sY, x, y);
             
            //If the user has Xed out the window
            if( event.type == SDL_QUIT )
            {
                //Quit the program
                quit = true;
            }
    
        //Update the screen
        if( SDL_Flip( screen ) == -1 )
        {
            return 1;    
        }
    }
        
        
    //Clean up
    clean_up();
    
    return 0;    
}