test/testrelative.c

/*
  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/

/* Simple program:  Test relative mouse motion */

#include <stdlib.h>
#include <stdio.h>
#include <time.h>

#include "common.h"


static CommonState *state;
static SDL_Rect rect;

static void
DrawRects(SDL_Renderer * renderer)
{
    SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
    SDL_RenderFillRect(renderer,&rect);
}

int
main(int argc, char *argv[])
{
    int i, done;
    SDL_Event event;

 
    /* Initialize test framework */
    state = CommonCreateState(argv, SDL_INIT_VIDEO);
    if (!state) {
        return 1;
    }
    for (i = 1; i < argc;i++) {
        CommonArg(state, i);
    }
    if (!CommonInit(state)) {
        return 2;
    }

    /* Create the windows and initialize the renderers */
    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
        SDL_RenderClear(renderer);
    }

    srand((unsigned int)time(NULL));
    if(SDL_SetRelativeMouseMode(SDL_TRUE) < 0) {
        return 3;
    };

    rect.x = DEFAULT_WINDOW_WIDTH / 2;
    rect.y = DEFAULT_WINDOW_HEIGHT / 2;
    rect.w = 10;
    rect.h = 10;
    /* Main render loop */
    done = 0;
    while (!done) {
        /* Check for events */
        while (SDL_PollEvent(&event)) {
            CommonEvent(state, &event, &done);
            switch(event.type) {
                case SDL_MOUSEMOTION:
                {
                    /*printf("mouse motion ABS x %d y %d REL x %d y %d\n",event.motion.x,event.motion.y,event.motion.xrel,event.motion.yrel);*/
                    rect.x += event.motion.xrel;
                    rect.y += event.motion.yrel;

                }
                break;
            }
        }
        for (i = 0; i < state->num_windows; ++i) {
            SDL_Renderer *renderer = state->renderers[i];
            SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
            SDL_RenderClear(renderer);

            DrawRects(renderer);

            SDL_RenderPresent(renderer);
        }
    }

    CommonQuit(state);
    return 0;
}

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