sdl

FORK: Simple Directmedia Layer
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testrelative.c (3285B)

      1 /*
      2   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      3 
      4   This software is provided 'as-is', without any express or implied
      5   warranty.  In no event will the authors be held liable for any damages
      6   arising from the use of this software.
      7 
      8   Permission is granted to anyone to use this software for any purpose,
      9   including commercial applications, and to alter it and redistribute it
     10   freely.
     11 */
     12 
     13 /* Simple program:  Test relative mouse motion */
     14 
     15 #include <stdlib.h>
     16 #include <stdio.h>
     17 #include <time.h>
     18 
     19 #include "SDL_test_common.h"
     20 
     21 #ifdef __EMSCRIPTEN__
     22 #include <emscripten/emscripten.h>
     23 #endif
     24 
     25 static SDLTest_CommonState *state;
     26 int i, done;
     27 SDL_Rect rect;
     28 SDL_Event event;
     29 
     30 static void
     31 DrawRects(SDL_Renderer * renderer, SDL_Rect * rect)
     32 {
     33     SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
     34     SDL_RenderFillRect(renderer, rect);
     35 }
     36 
     37 static void
     38 loop(){
     39     /* Check for events */
     40     while (SDL_PollEvent(&event)) {
     41         SDLTest_CommonEvent(state, &event, &done);
     42         switch(event.type) {
     43         case SDL_MOUSEMOTION:
     44             {
     45                 rect.x += event.motion.xrel;
     46                 rect.y += event.motion.yrel;
     47             }
     48             break;
     49         }
     50     }
     51     for (i = 0; i < state->num_windows; ++i) {
     52         SDL_Rect viewport;
     53         SDL_Renderer *renderer = state->renderers[i];
     54         if (state->windows[i] == NULL)
     55             continue;
     56         SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF);
     57         SDL_RenderClear(renderer);
     58 
     59         /* Wrap the cursor rectangle at the screen edges to keep it visible */
     60         SDL_RenderGetViewport(renderer, &viewport);
     61         if (rect.x < viewport.x) rect.x += viewport.w;
     62         if (rect.y < viewport.y) rect.y += viewport.h;
     63         if (rect.x > viewport.x + viewport.w) rect.x -= viewport.w;
     64         if (rect.y > viewport.y + viewport.h) rect.y -= viewport.h;
     65 
     66         DrawRects(renderer, &rect);
     67 
     68         SDL_RenderPresent(renderer);
     69     }
     70 #ifdef __EMSCRIPTEN__
     71     if (done) {
     72         emscripten_cancel_main_loop();
     73     }
     74 #endif
     75 }
     76 
     77 int
     78 main(int argc, char *argv[])
     79 {
     80 
     81     /* Enable standard application logging */
     82     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
     83 
     84     /* Initialize test framework */
     85     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
     86     if (!state) {
     87         return 1;
     88     }
     89     for (i = 1; i < argc; ++i) {
     90         SDLTest_CommonArg(state, i);
     91     }
     92     if (!SDLTest_CommonInit(state)) {
     93         return 2;
     94     }
     95 
     96     /* Create the windows and initialize the renderers */
     97     for (i = 0; i < state->num_windows; ++i) {
     98         SDL_Renderer *renderer = state->renderers[i];
     99         SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
    100         SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
    101         SDL_RenderClear(renderer);
    102     }
    103 
    104     srand((unsigned int)time(NULL));
    105     if(SDL_SetRelativeMouseMode(SDL_TRUE) < 0) {
    106         return 3;
    107     };
    108 
    109     rect.x = DEFAULT_WINDOW_WIDTH / 2;
    110     rect.y = DEFAULT_WINDOW_HEIGHT / 2;
    111     rect.w = 10;
    112     rect.h = 10;
    113     /* Main render loop */
    114     done = 0;
    115 #ifdef __EMSCRIPTEN__
    116     emscripten_set_main_loop(loop, 0, 1);
    117 #else
    118     while (!done) {
    119         loop();
    120         }
    121 #endif
    122     SDLTest_CommonQuit(state);
    123     return 0;
    124 }
    125 
    126 /* vi: set ts=4 sw=4 expandtab: */