/
testgesture.c
297 lines (241 loc) · 8.26 KB
2
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
3
4
5
6
7
8
9
10
11
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.
*/
13
14
15
16
17
18
19
20
21
22
23
24
25
/* Usage:
* Spacebar to begin recording a gesture on all touches.
* s to save all touches into "./gestureSave"
* l to load all touches from "./gestureSave"
*/
#include "SDL.h"
#include <stdlib.h> /* for exit() */
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
26
27
28
#include "SDL_test.h"
#include "SDL_test_common.h"
29
30
31
32
33
34
35
36
37
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
/* MUST BE A POWER OF 2! */
#define EVENT_BUF_SIZE 256
#define VERBOSE 0
38
static SDLTest_CommonState *state;
39
40
41
static SDL_Event events[EVENT_BUF_SIZE];
static int eventWrite;
static int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
42
static int quitting = 0;
44
45
46
typedef struct
{
float x, y;
49
50
51
52
typedef struct
{
float ang, r;
Point p;
55
56
static Knob knob = { 0.0f, 0.1f, { 0.0f, 0.0f } };
58
59
static void
setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
61
62
63
64
65
66
67
68
69
70
Uint32 *pixmem32;
Uint32 colour;
Uint8 r, g, b;
const int x = (int)_x;
const int y = (int)_y;
float a;
if ( (x < 0) || (x >= screen->w) || (y < 0) || (y >= screen->h) ) {
return;
}
72
pixmem32 = (Uint32 *) screen->pixels + y * screen->pitch / BPP + x;
74
SDL_memcpy(&colour, pixmem32, screen->format->BytesPerPixel);
76
SDL_GetRGB(colour,screen->format,&r,&g,&b);
78
79
80
81
82
/* r = 0;g = 0; b = 0; */
a = (float) ((col >> 24) & 0xFF);
if (a == 0) {
a = 0xFF; /* Hack, to make things easier. */
}
84
85
86
87
88
a = (a == 0.0f) ? 1 : (a / 255.0f);
r = (Uint8) (r * (1 - a) + ((col >> 16) & 0xFF) * a);
g = (Uint8) (g * (1 - a) + ((col >> 8) & 0xFF) * a);
b = (Uint8) (b * (1 - a) + ((col >> 0) & 0xFF) * a);
colour = SDL_MapRGB(screen->format, r, g, b);
90
*pixmem32 = colour;
93
94
95
96
97
98
99
static void
drawLine(SDL_Surface *screen, float x0, float y0, float x1, float y1, unsigned int col)
{
float t;
for (t = 0; t < 1; t += (float) (1.0f / SDL_max(SDL_fabs(x0 - x1), SDL_fabs(y0 - y1)))) {
setpix(screen, x1 + t * (x0 - x1), y1 + t * (y0 - y1), col);
}
102
103
static void
drawCircle(SDL_Surface *screen, float x, float y, float r, unsigned int c)
105
106
107
108
109
110
111
112
113
114
115
float tx,ty, xr;
for (ty = (float) -SDL_fabs(r); ty <= (float) SDL_fabs((int) r); ty++) {
xr = (float) SDL_sqrt(r * r - ty * ty);
if (r > 0) { /* r > 0 ==> filled circle */
for(tx = -xr + 0.5f; tx <= xr - 0.5f; tx++) {
setpix(screen, x + tx, y + ty, c);
}
} else {
setpix(screen, x - xr + 0.5f, y + ty, c);
setpix(screen, x + xr - 0.5f, y + ty, c);
}
119
120
121
122
123
124
static void
drawKnob(SDL_Surface *screen, const Knob *k)
{
drawCircle(screen, k->p.x * screen->w, k->p.y * screen->h, k->r * screen->w, 0xFFFFFF);
drawCircle(screen, (k->p.x + k->r / 2 * SDL_cosf(k->ang)) * screen->w,
(k->p.y + k->r / 2 * SDL_sinf(k->ang)) * screen->h, k->r / 4 * screen->w, 0);
127
128
static void
DrawScreen(SDL_Window *window)
130
131
SDL_Surface *screen = SDL_GetWindowSurface(window);
int i;
133
134
135
if (!screen) {
return;
}
137
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 75, 75, 75));
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/* draw Touch History */
for (i = eventWrite; i < eventWrite + EVENT_BUF_SIZE; ++i) {
const SDL_Event *event = &events[i & (EVENT_BUF_SIZE - 1)];
const float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
float x, y;
unsigned int c, col;
if ( (event->type == SDL_FINGERMOTION) ||
(event->type == SDL_FINGERDOWN) ||
(event->type == SDL_FINGERUP) ) {
x = event->tfinger.x;
y = event->tfinger.y;
/* draw the touch: */
c = colors[event->tfinger.fingerId % 7];
col = ((unsigned int) (c * (0.1f + 0.85f))) | (unsigned int) (0xFF * age) << 24;
if (event->type == SDL_FINGERMOTION) {
drawCircle(screen, x * screen->w, y * screen->h, 5, col);
} else if (event->type == SDL_FINGERDOWN) {
drawCircle(screen, x * screen->w, y * screen->h, -10, col);
}
}
164
165
166
if (knob.p.x > 0) {
drawKnob(screen, &knob);
}
168
SDL_UpdateWindowSurface(window);
171
172
static void
loop(void)
173
174
175
{
SDL_Event event;
SDL_RWops *stream;
178
while (SDL_PollEvent(&event)) {
179
180
SDLTest_CommonEvent(state, &event, &quitting);
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/* Record _all_ events */
events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
eventWrite++;
switch (event.type) {
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_i: {
for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
const SDL_TouchID id = SDL_GetTouchDevice(i);
SDL_Log("Fingers Down on device %"SDL_PRIs64": %d", id, SDL_GetNumTouchFingers(id));
}
break;
}
case SDLK_SPACE:
SDL_RecordGesture(-1);
break;
case SDLK_s:
stream = SDL_RWFromFile("gestureSave", "w");
SDL_Log("Wrote %i templates", SDL_SaveAllDollarTemplates(stream));
SDL_RWclose(stream);
break;
case SDLK_l:
stream = SDL_RWFromFile("gestureSave", "r");
SDL_Log("Loaded: %i", SDL_LoadDollarTemplates(-1, stream));
SDL_RWclose(stream);
break;
}
break;
215
216
217
218
219
220
221
222
223
224
225
226
227
228
case SDL_FINGERMOTION:
SDL_Log("Finger: %"SDL_PRIs64",x: %f, y: %f",event.tfinger.fingerId,
event.tfinger.x,event.tfinger.y);
break;
case SDL_FINGERDOWN:
SDL_Log("Finger: %"SDL_PRIs64" down - x: %f, y: %f",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
break;
case SDL_FINGERUP:
SDL_Log("Finger: %"SDL_PRIs64" up - x: %f, y: %f",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
break;
230
231
case SDL_MULTIGESTURE:
233
234
235
236
SDL_Log("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f",
event.mgesture.x, event.mgesture.y,
event.mgesture.dTheta, event.mgesture.dDist);
SDL_Log("MG: numDownTouch = %i",event.mgesture.numFingers);
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
knob.p.x = event.mgesture.x;
knob.p.y = event.mgesture.y;
knob.ang += event.mgesture.dTheta;
knob.r += event.mgesture.dDist;
break;
case SDL_DOLLARGESTURE:
SDL_Log("Gesture %"SDL_PRIs64" performed, error: %f",
event.dgesture.gestureId, event.dgesture.error);
break;
case SDL_DOLLARRECORD:
SDL_Log("Recorded gesture: %"SDL_PRIs64"",event.dgesture.gestureId);
break;
}
255
256
257
for (i = 0; i < state->num_windows; ++i) {
if (state->windows[i]) {
258
DrawScreen(state->windows[i]);
261
262
263
264
265
266
267
268
269
270
#ifdef __EMSCRIPTEN__
if (quitting) {
emscripten_cancel_main_loop();
}
#endif
}
int main(int argc, char* argv[])
{
271
272
273
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
276
277
278
279
280
state->window_title = "Gesture Test";
state->window_w = WIDTH;
state->window_h = HEIGHT;
state->skip_renderer = SDL_TRUE;
281
282
if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
SDLTest_CommonQuit(state);
283
284
return 1;
}
285
286
287
288
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
289
while (!quitting) {
290
291
292
293
loop();
}
#endif
294
295
SDLTest_CommonQuit(state);
return 0;