This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_gesture.c
642 lines (541 loc) · 17.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2010 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
16
License along with this library; if not, write to the Free Software Founation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17
18
19
20
21
22
23
24
25
26
27
28
29
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/* General mouse handling code for SDL */
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "SDL_gesture_c.h"
//TODO: Replace with malloc
30
31
32
#define MAXPATHSIZE 1024
33
34
35
36
37
38
#define DOLLARNPOINTS 64
#define DOLLARSIZE 256
39
40
#define ENABLE_DOLLAR
41
42
//PHI = ((sqrt(5)-1)/2)
#define PHI 0.618033989
43
44
45
typedef struct {
float x,y;
46
} SDL_FloatPoint;
47
48
49
50
51
typedef struct {
float length;
int numPoints;
52
53
SDL_FloatPoint p[MAXPATHSIZE];
} SDL_DollarPath;
54
55
typedef struct {
56
SDL_FloatPoint path[DOLLARNPOINTS];
57
unsigned long hash;
58
} SDL_DollarTemplate;
59
60
typedef struct {
61
SDL_GestureID id;
62
63
64
SDL_FloatPoint res;
SDL_FloatPoint centroid;
SDL_DollarPath dollarPath;
65
Uint16 numDownFingers;
66
67
int numDollarTemplates;
68
SDL_DollarTemplate *dollarTemplate;
69
70
SDL_bool recording;
71
} SDL_GestureTouch;
72
73
74
SDL_GestureTouch *SDL_gestureTouch;
int SDL_numGestureTouches = 0;
75
76
SDL_bool recordAll;
77
void SDL_PrintPath(SDL_FloatPoint *path) {
78
79
80
81
82
83
84
85
int i;
printf("Path:");
for(i=0;i<DOLLARNPOINTS;i++) {
printf(" (%f,%f)",path[i].x,path[i].y);
}
printf("\n");
}
86
int SDL_RecordGesture(SDL_TouchID touchId) {
87
88
int i;
if(touchId < 0) recordAll = SDL_TRUE;
89
90
91
for(i = 0;i < SDL_numGestureTouches; i++) {
if((touchId < 0) || (SDL_gestureTouch[i].id == touchId)) {
SDL_gestureTouch[i].recording = SDL_TRUE;
92
93
94
95
96
97
98
if(touchId >= 0)
return 1;
}
}
return (touchId < 0);
}
99
unsigned long SDL_HashDollar(SDL_FloatPoint* points) {
100
101
102
103
104
105
106
107
108
unsigned long hash = 5381;
int i;
for(i = 0;i < DOLLARNPOINTS; i++) {
hash = ((hash<<5) + hash) + points[i].x;
hash = ((hash<<5) + hash) + points[i].y;
}
return hash;
}
109
110
static int SaveTemplate(SDL_DollarTemplate *templ, SDL_RWops * src) {
111
if(src == NULL) return 0;
112
113
int i;
114
115
116
//No Longer storing the Hash, rehash on load
//if(SDL_RWops.write(src,&(templ->hash),sizeof(templ->hash),1) != 1) return 0;
117
118
119
120
121
if(SDL_RWwrite(src,templ->path,
sizeof(templ->path[0]),DOLLARNPOINTS) != DOLLARNPOINTS)
return 0;
122
return 1;
123
124
125
}
126
int SDL_SaveAllDollarTemplates(SDL_RWops *src) {
127
int i,j,rtrn = 0;
128
129
for(i = 0; i < SDL_numGestureTouches; i++) {
SDL_GestureTouch* touch = &SDL_gestureTouch[i];
130
for(j = 0;j < touch->numDollarTemplates; j++) {
131
rtrn += SaveTemplate(&touch->dollarTemplate[i],src);
132
133
134
135
136
}
}
return rtrn;
}
137
int SDL_SaveDollarTemplate(SDL_GestureID gestureId, SDL_RWops *src) {
138
int i,j;
139
140
for(i = 0; i < SDL_numGestureTouches; i++) {
SDL_GestureTouch* touch = &SDL_gestureTouch[i];
141
142
for(j = 0;j < touch->numDollarTemplates; j++) {
if(touch->dollarTemplate[i].hash == gestureId) {
143
return SaveTemplate(&touch->dollarTemplate[i],src);
144
145
146
}
}
}
147
148
149
150
151
152
SDL_SetError("Unknown gestureId");
return -1;
}
//path is an already sampled set of points
//Returns the index of the gesture on success, or -1
153
static int SDL_AddDollarGesture(SDL_GestureTouch* inTouch,SDL_FloatPoint* path) {
154
if(inTouch == NULL) {
155
if(SDL_numGestureTouches == 0) return -1;
156
int i = 0;
157
158
159
160
161
162
163
164
165
166
for(i = 0;i < SDL_numGestureTouches; i++) {
inTouch = &SDL_gestureTouch[i];
SDL_DollarTemplate* dollarTemplate =
SDL_realloc(inTouch->dollarTemplate,
(inTouch->numDollarTemplates + 1) *
sizeof(SDL_DollarTemplate));
if(!dollarTemplate) {
SDL_OutOfMemory();
return -1;
167
}
168
169
170
171
172
173
174
175
inTouch->dollarTemplate = dollarTemplate;
SDL_DollarTemplate *templ =
&inTouch->dollarTemplate[inTouch->numDollarTemplates];
memcpy(templ->path,path,DOLLARNPOINTS*sizeof(SDL_FloatPoint));
templ->hash = SDL_HashDollar(templ->path);
inTouch->numDollarTemplates++;
176
177
}
return inTouch->numDollarTemplates - 1;
178
179
180
181
182
183
184
185
186
187
188
189
190
} else {
SDL_DollarTemplate* dollarTemplate =
SDL_realloc(inTouch->dollarTemplate,
(inTouch->numDollarTemplates + 1) *
sizeof(SDL_DollarTemplate));
if(!dollarTemplate) {
SDL_OutOfMemory();
return -1;
}
inTouch->dollarTemplate = dollarTemplate;
SDL_DollarTemplate *templ =
191
&inTouch->dollarTemplate[inTouch->numDollarTemplates];
192
memcpy(templ->path,path,DOLLARNPOINTS*sizeof(SDL_FloatPoint));
193
194
195
196
197
templ->hash = SDL_HashDollar(templ->path);
inTouch->numDollarTemplates++;
return inTouch->numDollarTemplates - 1;
}
return -1;
198
199
}
200
int SDL_LoadDollarTemplates(SDL_TouchID touchId, SDL_RWops *src) {
201
if(src == NULL) return 0;
202
int i,loaded = 0;
203
SDL_GestureTouch *touch = NULL;
204
if(touchId >= 0) {
205
206
207
for(i = 0;i < SDL_numGestureTouches; i++)
if(SDL_gestureTouch[i].id == touchId)
touch = &SDL_gestureTouch[i];
208
209
210
if(touch == NULL) return -1;
}
211
while(1) {
212
213
214
215
SDL_DollarTemplate templ;
if(SDL_RWread(src,templ.path,sizeof(templ.path[0]),DOLLARNPOINTS) <
DOLLARNPOINTS) break;
216
217
if(touchId >= 0) {
218
219
printf("Adding loaded gesture to 1 touch\n");
if(SDL_AddDollarGesture(touch,templ.path)) loaded++;
220
221
}
else {
222
223
224
printf("Adding to: %i touches\n",SDL_numGestureTouches);
for(i = 0;i < SDL_numGestureTouches; i++) {
touch = &SDL_gestureTouch[i];
225
226
227
printf("Adding loaded gesture to + touches\n");
//TODO: What if this fails?
SDL_AddDollarGesture(touch,templ.path);
228
229
230
231
232
}
loaded++;
}
}
233
return loaded;
234
235
236
}
237
238
float dollarDifference(SDL_FloatPoint* points,SDL_FloatPoint* templ,float ang) {
// SDL_FloatPoint p[DOLLARNPOINTS];
239
float dist = 0;
240
SDL_FloatPoint p;
241
242
243
244
245
246
247
248
249
250
251
int i;
for(i = 0; i < DOLLARNPOINTS; i++) {
p.x = points[i].x * cos(ang) - points[i].y * sin(ang);
p.y = points[i].x * sin(ang) + points[i].y * cos(ang);
dist += sqrt((p.x-templ[i].x)*(p.x-templ[i].x)+
(p.y-templ[i].y)*(p.y-templ[i].y));
}
return dist/DOLLARNPOINTS;
}
252
float bestDollarDifference(SDL_FloatPoint* points,SDL_FloatPoint* templ) {
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
//------------BEGIN DOLLAR BLACKBOX----------------//
//-TRANSLATED DIRECTLY FROM PSUDEO-CODE AVAILABLE AT-//
//-"http://depts.washington.edu/aimgroup/proj/dollar/"-//
float ta = -M_PI/4;
float tb = M_PI/4;
float dt = M_PI/90;
float x1 = PHI*ta + (1-PHI)*tb;
float f1 = dollarDifference(points,templ,x1);
float x2 = (1-PHI)*ta + PHI*tb;
float f2 = dollarDifference(points,templ,x2);
while(abs(ta-tb) > dt) {
if(f1 < f2) {
tb = x2;
x2 = x1;
f2 = f1;
x1 = PHI*ta + (1-PHI)*tb;
f1 = dollarDifference(points,templ,x1);
}
else {
ta = x1;
x1 = x2;
f1 = f2;
x2 = (1-PHI)*ta + PHI*tb;
f2 = dollarDifference(points,templ,x2);
}
}
/*
if(f1 <= f2)
printf("Min angle (x1): %f\n",x1);
else if(f1 > f2)
printf("Min angle (x2): %f\n",x2);
*/
return SDL_min(f1,f2);
}
//DollarPath contains raw points, plus (possibly) the calculated length
289
int dollarNormalize(SDL_DollarPath path,SDL_FloatPoint *points) {
290
291
292
293
294
295
296
297
298
299
300
301
302
303
int i;
//Calculate length if it hasn't already been done
if(path.length <= 0) {
for(i=1;i<path.numPoints;i++) {
float dx = path.p[i ].x -
path.p[i-1].x;
float dy = path.p[i ].y -
path.p[i-1].y;
path.length += sqrt(dx*dx+dy*dy);
}
}
//Resample
float interval = path.length/(DOLLARNPOINTS - 1);
304
float dist = interval;
305
306
int numPoints = 0;
307
SDL_FloatPoint centroid;
308
309
centroid.x = 0;centroid.y = 0;
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
//printf("(%f,%f)\n",path.p[path.numPoints-1].x,path.p[path.numPoints-1].y);
for(i = 1;i < path.numPoints;i++) {
float d = sqrt((path.p[i-1].x-path.p[i].x)*(path.p[i-1].x-path.p[i].x)+
(path.p[i-1].y-path.p[i].y)*(path.p[i-1].y-path.p[i].y));
//printf("d = %f dist = %f/%f\n",d,dist,interval);
while(dist + d > interval) {
points[numPoints].x = path.p[i-1].x +
((interval-dist)/d)*(path.p[i].x-path.p[i-1].x);
points[numPoints].y = path.p[i-1].y +
((interval-dist)/d)*(path.p[i].y-path.p[i-1].y);
centroid.x += points[numPoints].x;
centroid.y += points[numPoints].y;
numPoints++;
dist -= interval;
}
dist += d;
}
328
329
330
331
332
333
334
335
if(numPoints < DOLLARNPOINTS-1) {
printf("ERROR: NumPoints = %i\n",numPoints);
return 0;
}
//copy the last point
points[DOLLARNPOINTS-1] = path.p[path.numPoints-1];
numPoints = DOLLARNPOINTS;
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
centroid.x /= numPoints;
centroid.y /= numPoints;
//printf("Centroid (%f,%f)",centroid.x,centroid.y);
//Rotate Points so point 0 is left of centroid and solve for the bounding box
float xmin,xmax,ymin,ymax;
xmin = centroid.x;
xmax = centroid.x;
ymin = centroid.y;
ymax = centroid.y;
float ang = atan2(centroid.y - points[0].y,
centroid.x - points[0].x);
for(i = 0;i<numPoints;i++) {
float px = points[i].x;
float py = points[i].y;
points[i].x = (px - centroid.x)*cos(ang) -
(py - centroid.y)*sin(ang) + centroid.x;
points[i].y = (px - centroid.x)*sin(ang) +
(py - centroid.y)*cos(ang) + centroid.y;
if(points[i].x < xmin) xmin = points[i].x;
if(points[i].x > xmax) xmax = points[i].x;
if(points[i].y < ymin) ymin = points[i].y;
if(points[i].y > ymax) ymax = points[i].y;
}
//Scale points to DOLLARSIZE, and translate to the origin
float w = xmax-xmin;
float h = ymax-ymin;
for(i=0;i<numPoints;i++) {
points[i].x = (points[i].x - centroid.x)*DOLLARSIZE/w;
points[i].y = (points[i].y - centroid.y)*DOLLARSIZE/h;
}
return numPoints;
}
376
float dollarRecognize(SDL_DollarPath path,int *bestTempl,SDL_GestureTouch* touch) {
377
378
SDL_FloatPoint points[DOLLARNPOINTS];
379
int numPoints = dollarNormalize(path,points);
380
//SDL_PrintPath(points);
381
382
383
384
385
386
387
388
389
390
391
int i;
int bestDiff = 10000;
*bestTempl = -1;
for(i = 0;i < touch->numDollarTemplates;i++) {
int diff = bestDollarDifference(points,touch->dollarTemplate[i].path);
if(diff < bestDiff) {bestDiff = diff; *bestTempl = i;}
}
return bestDiff;
}
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
int SDL_GestureAddTouch(SDL_Touch* touch) {
SDL_GestureTouch *gestureTouch = SDL_realloc(SDL_gestureTouch,
(SDL_numGestureTouches + 1) *
sizeof(SDL_GestureTouch));
if(!gestureTouch) {
SDL_OutOfMemory();
return -1;
}
SDL_gestureTouch = gestureTouch;
SDL_gestureTouch[SDL_numGestureTouches].res.x = touch->xres;
SDL_gestureTouch[SDL_numGestureTouches].res.y = touch->yres;
SDL_gestureTouch[SDL_numGestureTouches].numDownFingers = 0;
407
408
409
SDL_gestureTouch[SDL_numGestureTouches].res.x = touch->xres;
SDL_gestureTouch[SDL_numGestureTouches].id = touch->id;
410
411
SDL_gestureTouch[SDL_numGestureTouches].numDollarTemplates = 0;
412
413
SDL_gestureTouch[SDL_numGestureTouches].recording = SDL_FALSE;
414
415
SDL_numGestureTouches++;
416
417
418
return 0;
}
419
int SDL_GestureRemoveTouch(SDL_TouchID id) {
420
int i;
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
for(i = 0;i < SDL_numGestureTouches; i++) {
if(SDL_gestureTouch[i].id == id) {
SDL_numGestureTouches--;
SDL_gestureTouch[i] = SDL_gestureTouch[SDL_numGestureTouches];
return 1;
}
}
return -1;
}
SDL_GestureTouch * SDL_GetGestureTouch(SDL_TouchID id) {
int i;
for(i = 0;i < SDL_numGestureTouches; i++) {
//printf("%i ?= %i\n",SDL_gestureTouch[i].id,id);
if(SDL_gestureTouch[i].id == id) return &SDL_gestureTouch[i];
437
438
439
440
}
return NULL;
}
441
int SDL_SendGestureMulti(SDL_GestureTouch* touch,float dTheta,float dDist) {
442
443
444
445
446
447
448
SDL_Event event;
event.mgesture.type = SDL_MULTIGESTURE;
event.mgesture.touchId = touch->id;
event.mgesture.x = touch->centroid.x;
event.mgesture.y = touch->centroid.y;
event.mgesture.dTheta = dTheta;
event.mgesture.dDist = dDist;
449
event.mgesture.numFingers = touch->numDownFingers;
450
451
452
return SDL_PushEvent(&event) > 0;
}
453
int SDL_SendGestureDollar(SDL_GestureTouch* touch,
454
SDL_GestureID gestureId,float error) {
455
456
457
458
459
460
461
462
463
464
465
466
467
SDL_Event event;
event.dgesture.type = SDL_DOLLARGESTURE;
event.dgesture.touchId = touch->id;
/*
//TODO: Add this to give location of gesture?
event.mgesture.x = touch->centroid.x;
event.mgesture.y = touch->centroid.y;
*/
event.dgesture.gestureId = gestureId;
event.dgesture.error = error;
return SDL_PushEvent(&event) > 0;
}
468
469
int SDL_SendDollarRecord(SDL_GestureTouch* touch,SDL_GestureID gestureId) {
470
471
472
473
474
475
476
477
478
SDL_Event event;
event.dgesture.type = SDL_DOLLARRECORD;
event.dgesture.touchId = touch->id;
event.dgesture.gestureId = gestureId;
return SDL_PushEvent(&event) > 0;
}
479
480
481
482
483
void SDL_GestureProcessEvent(SDL_Event* event)
{
if(event->type == SDL_FINGERMOTION ||
event->type == SDL_FINGERDOWN ||
event->type == SDL_FINGERUP) {
484
SDL_GestureTouch* inTouch = SDL_GetGestureTouch(event->tfinger.touchId);
485
486
487
488
//Shouldn't be possible
if(inTouch == NULL) return;
489
490
491
492
//printf("@ (%i,%i) with res: (%i,%i)\n",(int)event->tfinger.x,
// (int)event->tfinger.y,
// (int)inTouch->res.x,(int)inTouch->res.y);
493
494
495
float x = ((float)event->tfinger.x)/(float)inTouch->res.x;
float y = ((float)event->tfinger.y)/(float)inTouch->res.y;
496
497
498
499
500
501
502
503
504
//Finger Up
if(event->type == SDL_FINGERUP) {
inTouch->numDownFingers--;
#ifdef ENABLE_DOLLAR
if(inTouch->recording) {
inTouch->recording = SDL_FALSE;
505
SDL_FloatPoint path[DOLLARNPOINTS];
506
dollarNormalize(inTouch->dollarPath,path);
507
//SDL_PrintPath(path);
508
509
510
511
int index;
if(recordAll) {
index = SDL_AddDollarGesture(NULL,path);
int i;
512
513
for(i = 0;i < SDL_numGestureTouches; i++)
SDL_gestureTouch[i].recording = SDL_FALSE;
514
515
}
else {
516
index = SDL_AddDollarGesture(inTouch,path);
517
}
518
519
520
521
522
523
524
525
526
527
528
if(index >= 0) {
SDL_SendDollarRecord(inTouch,inTouch->dollarTemplate[index].hash);
}
else {
SDL_SendDollarRecord(inTouch,-1);
}
}
else {
int bestTempl;
float error;
529
error = dollarRecognize(inTouch->dollarPath,
530
531
532
533
534
&bestTempl,inTouch);
if(bestTempl >= 0){
//Send Event
unsigned long gestureId = inTouch->dollarTemplate[bestTempl].hash;
SDL_SendGestureDollar(inTouch,gestureId,error);
535
//printf ("%s\n",);("Dollar error: %f\n",error);
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
}
}
#endif
//inTouch->gestureLast[j] = inTouch->gestureLast[inTouch->numDownFingers];
if(inTouch->numDownFingers > 0) {
inTouch->centroid.x = (inTouch->centroid.x*(inTouch->numDownFingers+1)-
x)/inTouch->numDownFingers;
inTouch->centroid.y = (inTouch->centroid.y*(inTouch->numDownFingers+1)-
y)/inTouch->numDownFingers;
}
}
else if(event->type == SDL_FINGERMOTION) {
float dx = ((float)event->tfinger.dx)/(float)inTouch->res.x;
float dy = ((float)event->tfinger.dy)/(float)inTouch->res.y;
//printf("dx,dy: (%f,%f)\n",dx,dy);
#ifdef ENABLE_DOLLAR
552
SDL_DollarPath* path = &inTouch->dollarPath;
553
if(path->numPoints < MAXPATHSIZE) {
554
555
path->p[path->numPoints].x = inTouch->centroid.x;
path->p[path->numPoints].y = inTouch->centroid.y;
556
557
558
559
560
float pathDx =
(path->p[path->numPoints].x-path->p[path->numPoints-1].x);
float pathDy =
(path->p[path->numPoints].y-path->p[path->numPoints-1].y);
path->length += sqrt(pathDx*pathDx + pathDy*pathDy);
561
562
563
path->numPoints++;
}
#endif
564
SDL_FloatPoint lastP;
565
566
lastP.x = x - dx;
lastP.y = y - dy;
567
SDL_FloatPoint lastCentroid;
568
569
570
lastCentroid = inTouch->centroid;
inTouch->centroid.x += dx/inTouch->numDownFingers;
571
572
inTouch->centroid.y += dy/inTouch->numDownFingers;
//printf("Centrid : (%f,%f)\n",inTouch->centroid.x,inTouch->centroid.y);
573
if(inTouch->numDownFingers > 1) {
574
575
SDL_FloatPoint lv; //Vector from centroid to last x,y position
SDL_FloatPoint v; //Vector from centroid to current x,y position
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
//lv = inTouch->gestureLast[j].cv;
lv.x = lastP.x - lastCentroid.x;
lv.y = lastP.y - lastCentroid.y;
float lDist = sqrt(lv.x*lv.x + lv.y*lv.y);
//printf("lDist = %f\n",lDist);
v.x = x - inTouch->centroid.x;
v.y = y - inTouch->centroid.y;
//inTouch->gestureLast[j].cv = v;
float Dist = sqrt(v.x*v.x+v.y*v.y);
// cos(dTheta) = (v . lv)/(|v| * |lv|)
//Normalize Vectors to simplify angle calculation
lv.x/=lDist;
lv.y/=lDist;
v.x/=Dist;
v.y/=Dist;
float dtheta = atan2(lv.x*v.y - lv.y*v.x,lv.x*v.x + lv.y*v.y);
float dDist = (Dist - lDist);
if(lDist == 0) {dDist = 0;dtheta = 0;} //To avoid impossible values
//inTouch->gestureLast[j].dDist = dDist;
//inTouch->gestureLast[j].dtheta = dtheta;
//printf("dDist = %f, dTheta = %f\n",dDist,dtheta);
//gdtheta = gdtheta*.9 + dtheta*.1;
//gdDist = gdDist*.9 + dDist*.1
//knob.r += dDist/numDownFingers;
//knob.ang += dtheta;
//printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist);
//printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist);
SDL_SendGestureMulti(inTouch,dtheta,dDist);
}
else {
//inTouch->gestureLast[j].dDist = 0;
//inTouch->gestureLast[j].dtheta = 0;
//inTouch->gestureLast[j].cv.x = 0;
//inTouch->gestureLast[j].cv.y = 0;
}
//inTouch->gestureLast[j].f.p.x = x;
//inTouch->gestureLast[j].f.p.y = y;
//break;
//pressure?
619
620
}
621
622
if(event->type == SDL_FINGERDOWN) {
623
624
625
626
627
inTouch->numDownFingers++;
inTouch->centroid.x = (inTouch->centroid.x*(inTouch->numDownFingers - 1)+
x)/inTouch->numDownFingers;
inTouch->centroid.y = (inTouch->centroid.y*(inTouch->numDownFingers - 1)+
y)/inTouch->numDownFingers;
628
629
630
//printf("Finger Down: (%f,%f). Centroid: (%f,%f\n",x,y,
// inTouch->centroid.x,inTouch->centroid.y);
631
632
633
634
635
#ifdef ENABLE_DOLLAR
inTouch->dollarPath.length = 0;
inTouch->dollarPath.p[0].x = x;
inTouch->dollarPath.p[0].y = y;
inTouch->dollarPath.numPoints = 1;
636
#endif
637
638
}
}
639
640
}
641
642
/* vi: set ts=4 sw=4 expandtab: */