Atlas - testgesture.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/*  Usage:
13 *  Spacebar to begin recording a gesture on all touches.
14 *  s to save all touches into "./gestureSave"
15 *  l to load all touches from "./gestureSave"
16 */
17
18#include "SDL.h"
19#include <stdlib.h> /* for exit() */
20
21#ifdef __EMSCRIPTEN__
22#include <emscripten/emscripten.h>
23#endif
24
25#define WIDTH 640
26#define HEIGHT 480
27#define BPP 4
28
29/* MUST BE A POWER OF 2! */
30#define EVENT_BUF_SIZE 256
31
32
33#define VERBOSE 0
34
35static SDL_Event events[EVENT_BUF_SIZE];
36static int eventWrite;
37
38
39static int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
40
41SDL_Surface *screen;
42SDL_Window *window;
43SDL_bool quitting = SDL_FALSE;
44
45typedef struct {
46  float x,y;
47} Point;
48
49typedef struct {
50  float ang,r;
51  Point p;
52} Knob;
53
54static Knob knob;
55
56void setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
57{
58  Uint32 *pixmem32;
59  Uint32 colour;
60  Uint8 r,g,b;
61  int x = (int)_x;
62  int y = (int)_y;
63  float a;
64
65  if(x < 0 || x >= screen->w) return;
66  if(y < 0 || y >= screen->h) return;
67
68  pixmem32 = (Uint32*) screen->pixels  + y*screen->pitch/BPP + x;
69
70  SDL_memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
71
72  SDL_GetRGB(colour,screen->format,&r,&g,&b);
73  /* r = 0;g = 0; b = 0; */
74  a = (float)((col>>24)&0xFF);
75  if(a == 0) a = 0xFF; /* Hack, to make things easier. */
76  a /= 0xFF;
77  r = (Uint8)(r*(1-a) + ((col>>16)&0xFF)*(a));
78  g = (Uint8)(g*(1-a) + ((col>> 8)&0xFF)*(a));
79  b = (Uint8)(b*(1-a) + ((col>> 0)&0xFF)*(a));
80  colour = SDL_MapRGB( screen->format,r, g, b);
81
82
83  *pixmem32 = colour;
84}
85
86void drawLine(SDL_Surface *screen,float x0,float y0,float x1,float y1,unsigned int col) {
87  float t;
88  for(t=0;t<1;t+=(float)(1.f/SDL_max(SDL_fabs(x0-x1),SDL_fabs(y0-y1))))
89    setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
90}
91
92void drawCircle(SDL_Surface* screen,float x,float y,float r,unsigned int c)
93{
94  float tx,ty;
95  float xr;
96  for(ty = (float)-SDL_fabs(r);ty <= (float)SDL_fabs((int)r);ty++) {
97    xr = (float)SDL_sqrt(r*r - ty*ty);
98    if(r > 0) { /* r > 0 ==> filled circle */
99      for(tx=-xr+.5f;tx<=xr-.5;tx++) {
100    setpix(screen,x+tx,y+ty,c);
101      }
102    }
103    else {
104      setpix(screen,x-xr+.5f,y+ty,c);
105      setpix(screen,x+xr-.5f,y+ty,c);
106    }
107  }
108}
109
110void drawKnob(SDL_Surface* screen,Knob k) {
111  drawCircle(screen,k.p.x*screen->w,k.p.y*screen->h,k.r*screen->w,0xFFFFFF);
112  drawCircle(screen,(k.p.x+k.r/2*SDL_cosf(k.ang))*screen->w,
113                (k.p.y+k.r/2*SDL_sinf(k.ang))*screen->h,k.r/4*screen->w,0);
114}
115
116void DrawScreen(SDL_Surface* screen, SDL_Window* window)
117{
118  int i;
119#if 1
120  SDL_FillRect(screen, NULL, 0);
121#else
122  int x, y;
123  for(y = 0;y < screen->h;y++)
124    for(x = 0;x < screen->w;x++)
125    setpix(screen,(float)x,(float)y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
126#endif
127
128  /* draw Touch History */
129  for(i = eventWrite; i < eventWrite+EVENT_BUF_SIZE; ++i) {
130    const SDL_Event *event = &events[i&(EVENT_BUF_SIZE-1)];
131    float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
132    float x, y;
133    unsigned int c, col;
134
135    if(event->type == SDL_FINGERMOTION ||
136       event->type == SDL_FINGERDOWN ||
137       event->type == SDL_FINGERUP) {
138      x = event->tfinger.x;
139      y = event->tfinger.y;
140
141      /* draw the touch: */
142      c = colors[event->tfinger.fingerId%7];
143      col = ((unsigned int)(c*(.1+.85))) | (unsigned int)(0xFF*age)<<24;
144
145      if(event->type == SDL_FINGERMOTION)
146    drawCircle(screen,x*screen->w,y*screen->h,5,col);
147      else if(event->type == SDL_FINGERDOWN)
148    drawCircle(screen,x*screen->w,y*screen->h,-10,col);
149    }
150  }
151
152  if(knob.p.x > 0)
153    drawKnob(screen,knob);
154
155  SDL_UpdateWindowSurface(window);
156}
157
158/* Returns a new SDL_Window if window is NULL or window if not. */
159SDL_Window* initWindow(SDL_Window *window, int width,int height)
160{
161  if (!window) {
162    window = SDL_CreateWindow("Gesture Test",
163                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
164                              width, height, SDL_WINDOW_RESIZABLE);
165  }
166  return window;
167}
168
169void loop()
170{
171    SDL_Event event;
172    SDL_RWops *stream;
173
174    while(SDL_PollEvent(&event))
175    {
176    /* Record _all_ events */
177    events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
178    eventWrite++;
179
180    switch (event.type)
181      {
182      case SDL_QUIT:
183        quitting = SDL_TRUE;
184        break;
185      case SDL_KEYDOWN:
186        switch (event.key.keysym.sym)
187          {
188              case SDLK_i:
189              {
190                  int i;
191                  for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
192                      SDL_TouchID id = SDL_GetTouchDevice(i);
193                      SDL_Log("Fingers Down on device %"SDL_PRIs64": %d", id, SDL_GetNumTouchFingers(id));
194                  }
195                  break;
196              }
197          case SDLK_SPACE:
198        SDL_RecordGesture(-1);
199        break;
200          case SDLK_s:
201        stream = SDL_RWFromFile("gestureSave", "w");
202        SDL_Log("Wrote %i templates", SDL_SaveAllDollarTemplates(stream));
203        SDL_RWclose(stream);
204        break;
205          case SDLK_l:
206        stream = SDL_RWFromFile("gestureSave", "r");
207        SDL_Log("Loaded: %i", SDL_LoadDollarTemplates(-1, stream));
208        SDL_RWclose(stream);
209        break;
210          case SDLK_ESCAPE:
211        quitting = SDL_TRUE;
212        break;
213        }
214        break;
215      case SDL_WINDOWEVENT:
216            if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
217          if (!(window = initWindow(window, event.window.data1, event.window.data2)) ||
218              !(screen = SDL_GetWindowSurface(window)))
219          {
220        SDL_Quit();
221        exit(1);
222          }
223            }
224        break;
225      case SDL_FINGERMOTION:
226#if VERBOSE
227        SDL_Log("Finger: %"SDL_PRIs64",x: %f, y: %f",event.tfinger.fingerId,
228               event.tfinger.x,event.tfinger.y);
229#endif
230        break;
231      case SDL_FINGERDOWN:
232#if VERBOSE
233        SDL_Log("Finger: %"SDL_PRIs64" down - x: %f, y: %f",
234           event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
235#endif
236        break;
237      case SDL_FINGERUP:
238#if VERBOSE
239        SDL_Log("Finger: %"SDL_PRIs64" up - x: %f, y: %f",
240               event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
241#endif
242        break;
243      case SDL_MULTIGESTURE:
244#if VERBOSE
245        SDL_Log("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f",
246           event.mgesture.x,
247           event.mgesture.y,
248           event.mgesture.dTheta,
249           event.mgesture.dDist);
250        SDL_Log("MG: numDownTouch = %i",event.mgesture.numFingers);
251#endif
252        knob.p.x = event.mgesture.x;
253        knob.p.y = event.mgesture.y;
254        knob.ang += event.mgesture.dTheta;
255        knob.r += event.mgesture.dDist;
256        break;
257      case SDL_DOLLARGESTURE:
258        SDL_Log("Gesture %"SDL_PRIs64" performed, error: %f",
259           event.dgesture.gestureId,
260           event.dgesture.error);
261        break;
262      case SDL_DOLLARRECORD:
263        SDL_Log("Recorded gesture: %"SDL_PRIs64"",event.dgesture.gestureId);
264        break;
265      }
266    }
267    DrawScreen(screen, window);
268
269#ifdef __EMSCRIPTEN__
270    if (quitting) {
271        emscripten_cancel_main_loop();
272    }
273#endif
274}
275
276int main(int argc, char* argv[])
277{
278  window = NULL;
279  screen = NULL;
280  quitting = SDL_FALSE;
281
282  /* Enable standard application logging */
283  SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
284
285  /* gesture variables */
286  knob.r = .1f;
287  knob.ang = 0;
288
289  if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
290
291  if (!(window = initWindow(window, WIDTH, HEIGHT)) ||
292      !(screen = SDL_GetWindowSurface(window)))
293  {
294      SDL_Quit();
295      return 1;
296  }
297
298#ifdef __EMSCRIPTEN__
299    emscripten_set_main_loop(loop, 0, 1);
300#else
301    while(!quitting) {
302        loop();
303    }
304#endif
305
306  SDL_Quit();
307  return 0;
308}
309
310
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