Create space between characters blitted on screen - SDL - c++

Question

I have a bmp-file of numbers and characters. My program reads keypresses and blits the appropriate character/number from the bitmap onto the screen. The only problem is if i press 'A' - 'A' will show on screen, but if I press 'B', it will take 'A's place. So I will never have more than one character on screen.
Here's my code:
#include <SDL/SDL.h>
#include <iostream>
#include <string>
#include <vector>
#include <SDL_image/SDL_image.h>
using namespace std;
const Uint32 FRAMES_PER_SECOND = 60;
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int WIDTH = 21;
const int HEIGHT = 25;
SDL_Event sdlEvent;
char getAsciiKey(const SDL_Event &sdlEvent);
int main( int argc, char* args[] )
{
//The surfaces
SDL_Surface* image[2] = {NULL};
SDL_Surface* screen = NULL;
//Start SDL
SDL_Init( SDL_INIT_EVERYTHING );
//Set up screen
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, 32, SDL_SWSURFACE | SDL_DOUBLEBUF );
char filename[256]; //create a large enough C-string
for(int index = 0; index < 2; index++)
{
sprintf(filename, "Text-types/Arial%d.bmp", index); //Arial0 and Arial1
//Load the image
image[index] = IMG_Load( filename );
if(image == NULL)
{
cout << "Error loading image: " << filename << endl;
exit(1);
}
}
Uint32 color = SDL_MapRGB(screen->format, 0xff,0xff,0xff); //White
SDL_FillRect(screen, &screen->clip_rect, color); //Backgroundcolor -> White
bool quit = false;
//Main program loop
while(quit == false)
{
//Process any events from the event queue - such as key presses or mouse movements
while(SDL_PollEvent(&sdlEvent))
{
if(sdlEvent.type == SDL_QUIT)
{
quit = true;
}
if (sdlEvent.type == SDL_KEYDOWN) //A key has just pressed
{
int x, y, temp;
SDL_Rect srcRect;
SDL_Rect dstRect;
//char letter = getAsciiKey(sdlEvent); //Getting keypress
temp = (static_cast<int>(getAsciiKey(sdlEvent)) - 12);
x = (temp % 20); //X-axis postion
y = (temp / 20); //Y-axis position
srcRect.x = (x - 1) * WIDTH;
srcRect.y = (y - 1) * HEIGHT;
//PIXELSIZE
srcRect.w = WIDTH;
srcRect.h = HEIGHT;
dstRect.x = 0;
dstRect.y = 0;
dstRect.w = WIDTH;
dstRect.h = HEIGHT;
SDL_BlitSurface(image[1] , &srcRect, screen, &dstRect ); //Putting image up on screen
//Update Screen
SDL_Flip( screen );
//Pause
SDL_Delay( 2000 );
}
}
}
//Free any loaded images
for(int index = 0; index < 2; index++)
{
SDL_FreeSurface( image[index] );
}
//Quit SDL
SDL_Quit();
return 0;
}
char getAsciiKey(const SDL_Event &sdlEvent)
{
char key = 0;
if(sdlEvent.key.keysym.sym >= SDLK_a && sdlEvent.key.keysym.sym <= SDLK_z)
{
if(sdlEvent.key.keysym.mod & KMOD_SHIFT)
{
key = 'A' + char(sdlEvent.key.keysym.sym - SDLK_a);
}
else
{
key = 'a' + char(sdlEvent.key.keysym.sym - SDLK_a);
}
}
else if(sdlEvent.key.keysym.sym >= SDLK_0 && sdlEvent.key.keysym.sym <= SDLK_9)
{
key = '0' + char(sdlEvent.key.keysym.sym - SDLK_0);
}
return key;
}

Answer 1

dstRect.x = 0;
dstRect.y = 0;
This is the position you're blitting to, and I don't see you changing it anywhere. Update it for each new character.
Also, this:
dstRect.w = WIDTH;
dstRect.h = HEIGHT;
is redundant, width and height of destination are ignored when blitting (at least the reference for SDL_BlitSurface says so).