SDL  2.0
testrelative.c
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1 /*
2  Copyright (C) 1997-2018 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 
26 int i, done;
29 
30 static void
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) {
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 */
83 
84  /* Initialize test framework */
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];
100  SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
101  SDL_RenderClear(renderer);
102  }
103 
104  srand((unsigned int)time(NULL));
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: */
int main(int argc, char *argv[])
Definition: testrelative.c:78
#define SDL_PollEvent
EGLSurface EGLnsecsANDROID time
Definition: eglext.h:518
SDLTest_CommonState * SDLTest_CommonCreateState(char **argv, Uint32 flags)
Parse command line parameters and create common state.
SDL_Rect rect
Definition: testrelative.c:27
int done
Definition: testrelative.c:26
#define SDL_RenderFillRect
int SDLTest_CommonArg(SDLTest_CommonState *state, int index)
Process one common argument.
static SDLTest_CommonState * state
Definition: testrelative.c:25
#define SDL_SetRenderDrawBlendMode
#define SDL_SetRelativeMouseMode
SDL_bool SDLTest_CommonInit(SDLTest_CommonState *state)
Open test window.
SDL_Window ** windows
void SDLTest_CommonEvent(SDLTest_CommonState *state, SDL_Event *event, int *done)
Common event handler for test windows.
static SDL_Renderer * renderer
#define SDL_RenderGetViewport
#define DEFAULT_WINDOW_HEIGHT
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Renderer ** renderers
#define SDL_LogSetPriority
#define NULL
Definition: begin_code.h:164
static void loop()
Definition: testrelative.c:38
#define SDL_RenderClear
int i
Definition: testrelative.c:26
int h
Definition: SDL_rect.h:67
SDL_Rect viewport
Definition: testviewport.c:28
General event structure.
Definition: SDL_events.h:525
#define SDL_SetRenderDrawColor
static void DrawRects(SDL_Renderer *renderer, SDL_Rect *rect)
Definition: testrelative.c:31
#define DEFAULT_WINDOW_WIDTH
int y
Definition: SDL_rect.h:66
void SDLTest_CommonQuit(SDLTest_CommonState *state)
Close test window.
#define SDL_INIT_VIDEO
Definition: SDL.h:78
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
#define SDL_RenderPresent
Uint32 type
Definition: SDL_events.h:527
SDL_Event event
Definition: testrelative.c:28