testdrawchessboard.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include "SDL.h"

Include dependency graph for testdrawchessboard.c:

Go to the source code of this file.

Functions
void	DrawChessBoard (SDL_Renderer *renderer)
void	loop ()
int	main (int argc, char *argv[])

Variables
SDL_Window *	window
SDL_Renderer *	renderer
SDL_Surface *	surface
int	done

Function Documentation

void DrawChessBoard

(

SDL_Renderer *

renderer

)

Definition at line 32 of file testdrawchessboard.c.

References SDL_Rect::h, rect, SDL_RenderFillRect, SDL_RenderGetViewport, SDL_SetRenderDrawColor, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by loop().

{
    int row = 0,column = 0,x = 0;
    SDL_Rect rect, darea;

    /* Get the Size of drawing surface */
    SDL_RenderGetViewport(renderer, &darea);

    for( ; row < 8; row++)
    {
        column = row%2;
        x = column;
        for( ; column < 4+(row%2); column++)
        {
            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);

            rect.w = darea.w/8;
            rect.h = darea.h/8;
            rect.x = x * rect.w;
            rect.y = row * rect.h;
            x = x + 2;
            SDL_RenderFillRect(renderer, &rect);
        }
    }
}

void loop

(

)

Definition at line 59 of file testdrawchessboard.c.

References done, DrawChessBoard(), e, SDL_WindowEvent::event, SDL_Event::key, SDL_KeyboardEvent::keysym, SDL_CreateSoftwareRenderer, SDL_DestroyRenderer, SDL_GetWindowSurface, SDL_KEYDOWN, SDL_PollEvent, SDL_QUIT, SDL_RenderClear, SDL_SetRenderDrawColor, SDL_UpdateWindowSurface, SDL_WINDOWEVENT, SDL_WINDOWEVENT_SIZE_CHANGED, SDLK_ESCAPE, SDL_Keysym::sym, SDL_Event::type, and SDL_Event::window.

{
    SDL_Event e;
    while (SDL_PollEvent(&e)) {
       
       /* Re-create when window has been resized */
       if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) {

          SDL_DestroyRenderer(renderer);

          surface = SDL_GetWindowSurface(window);
          renderer = SDL_CreateSoftwareRenderer(surface);
          /* Clear the rendering surface with the specified color */
          SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
          SDL_RenderClear(renderer);
       }

       if (e.type == SDL_QUIT) {
            done = 1;
#ifdef __EMSCRIPTEN__
            emscripten_cancel_main_loop();
#endif
            return;
        }

        if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) {
            done = 1;
#ifdef __EMSCRIPTEN__
            emscripten_cancel_main_loop();
#endif
            return;
        }
    }

    DrawChessBoard(renderer);

    /* Got everything on rendering surface,
       now Update the drawing image on window screen */
    SDL_UpdateWindowSurface(window);
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 101 of file testdrawchessboard.c.

References done, loop(), SDL_CreateSoftwareRenderer, SDL_CreateWindow, SDL_GetError, SDL_GetWindowSurface, SDL_Init, SDL_INIT_VIDEO, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_Quit, SDL_RenderClear, SDL_SetRenderDrawColor, SDL_WINDOW_RESIZABLE, and SDL_WINDOWPOS_UNDEFINED.

{
    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Initialize SDL */
    if(SDL_Init(SDL_INIT_VIDEO) != 0)
    {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError());
        return 1;
    }


    /* Create window and renderer for given surface */
    window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE);
    if(!window)
    {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
        return 1;
    }
    surface = SDL_GetWindowSurface(window);
    renderer = SDL_CreateSoftwareRenderer(surface);
    if(!renderer)
    {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError());
        return 1;
    }

    /* Clear the rendering surface with the specified color */
    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
    SDL_RenderClear(renderer);


    /* Draw the Image on rendering surface */
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        loop();
    }
#endif

    SDL_Quit();
    return 0;
}

Variable Documentation

int done

Definition at line 29 of file testdrawchessboard.c.

SDL_Renderer* renderer

Definition at line 27 of file testdrawchessboard.c.

SDL_Surface* surface

Definition at line 28 of file testdrawchessboard.c.

SDL_Window* window

Definition at line 26 of file testdrawchessboard.c.