test/testdrawchessboard.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 03 Jan 2018 10:03:25 -0800
changeset 11811 5d94cb6b24d3
parent 11274 daea00fb0938
child 12503 806492103856
permissions -rw-r--r--
Updated copyright for 2018
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/*
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   Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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   This software is provided 'as-is', without any express or implied
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   warranty.  In no event will the authors be held liable for any damages
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   arising from the use of this software.
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   Permission is granted to anyone to use this software for any purpose,
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   including commercial applications, and to alter it and redistribute it
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   freely.
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   This file is created by : Nitin Jain (nitin.j4@samsung.com)
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*/
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/* Sample program:  Draw a Chess Board  by using SDL_CreateSoftwareRenderer API */
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include "SDL.h"
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_Surface *surface;
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int done;
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void
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DrawChessBoard(SDL_Renderer * renderer)
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{
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    int row = 0,column = 0,x = 0;
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    SDL_Rect rect, darea;
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    /* Get the Size of drawing surface */
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    SDL_RenderGetViewport(renderer, &darea);
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    for( ; row < 8; row++)
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    {
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        column = row%2;
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        x = column;
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        for( ; column < 4+(row%2); column++)
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        {
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            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
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            rect.w = darea.w/8;
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            rect.h = darea.h/8;
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            rect.x = x * rect.w;
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            rect.y = row * rect.h;
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            x = x + 2;
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            SDL_RenderFillRect(renderer, &rect);
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        }
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    }
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}
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void
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loop()
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{
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    SDL_Event e;
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    while (SDL_PollEvent(&e)) {
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       /* Re-create when window has been resized */
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       if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) {
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          SDL_DestroyRenderer(renderer);
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          surface = SDL_GetWindowSurface(window);
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          renderer = SDL_CreateSoftwareRenderer(surface);
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          /* Clear the rendering surface with the specified color */
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          SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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          SDL_RenderClear(renderer);
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       }
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       if (e.type == SDL_QUIT) {
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            done = 1;
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#ifdef __EMSCRIPTEN__
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            emscripten_cancel_main_loop();
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#endif
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            return;
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        }
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        if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) {
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            done = 1;
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#ifdef __EMSCRIPTEN__
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            emscripten_cancel_main_loop();
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#endif
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            return;
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        }
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    }
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    DrawChessBoard(renderer);
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    /* Got everything on rendering surface,
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       now Update the drawing image on window screen */
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    SDL_UpdateWindowSurface(window);
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}
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int
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main(int argc, char *argv[])
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{
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    /* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Initialize SDL */
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    if(SDL_Init(SDL_INIT_VIDEO) != 0)
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    {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError());
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        return 1;
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    }
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    /* Create window and renderer for given surface */
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    window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE);
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    if(!window)
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    {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
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        return 1;
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    }
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    surface = SDL_GetWindowSurface(window);
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    renderer = SDL_CreateSoftwareRenderer(surface);
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    if(!renderer)
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    {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError());
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        return 1;
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    }
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    /* Clear the rendering surface with the specified color */
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    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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    SDL_RenderClear(renderer);
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    /* Draw the Image on rendering surface */
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    done = 0;
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#ifdef __EMSCRIPTEN__
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    emscripten_set_main_loop(loop, 0, 1);
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#else
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    while (!done) {
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        loop();
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    }
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#endif
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    SDL_Quit();
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    return 0;
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}
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