Atlas - testrelative.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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
25static SDLTest_CommonState *state;
26int i, done;
27SDL_Rect rect;
28SDL_Event event;
29
30static void
31DrawRects(SDL_Renderer * renderer, SDL_Rect * rect)
32{
33    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
34    SDL_RenderFillRect(renderer, rect);
35}
36
37static void
38loop(){
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
77int
78main(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: */
127
[FILE END]
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