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Added multi-finger gestures

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This commit is contained in:
Jim Grandpre 2010-07-06 02:05:27 -07:00
parent 06e66b928e
commit af9c689b21
1 changed files with 249 additions and 110 deletions
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325
touchTest/gestureTest.c
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@ -40,6 +40,12 @@ typedef struct {
int id;
} Finger;
typedef struct {
Finger f;
Point cv;
float dtheta,dDist;
} TouchPoint;
typedef struct { //dt + s
Point d,s; //direction, start
int points;
@ -53,10 +59,16 @@ typedef struct {
Point p[EVENT_BUF_SIZE]; //To be safe
} DollarPath;
typedef struct {
float ang,r;
Point p;
} Knob;
Knob knob;
Finger finger[MAXFINGERS];
Finger gestureLast[MAXFINGERS];
DollarPath dollarPath[MAXFINGERS];
#define MAXTEMPLATES 4
@ -119,22 +131,7 @@ void drawCircle(SDL_Surface* screen,int x,int y,int r,unsigned int c)
float a;
int tx;
/*
for(a=0;a<PI/2;a+=1.f/(float)abs(r))
{
if(r > 0) { //r > 0 ==> filled circle
for(tx=x-r*cos(a);tx<x+r*cos(a);tx++) {
setpix(screen,tx,(int)(y+r*sin(a)),c);
setpix(screen,tx,(int)(y-r*sin(a)),c);
}
} else {
//Draw Outline
setpix(screen,(int)(x+r*cos(a)),(int)(y+r*sin(a)),c);
setpix(screen,(int)(x-r*cos(a)),(int)(y+r*sin(a)),c);
setpix(screen,(int)(x+r*cos(a)),(int)(y-r*sin(a)),c);
setpix(screen,(int)(x-r*cos(a)),(int)(y-r*sin(a)),c);
}
}*/
int ty;
float xr;
for(ty = -abs(r);ty <= abs(r);ty++) {
@ -151,6 +148,16 @@ void drawCircle(SDL_Surface* screen,int x,int y,int r,unsigned int c)
}
}
void drawKnob(SDL_Surface* screen,Knob k) {
printf("Knob: x = %f, y = %f, r = %f, a = %f\n",k.p.x,k.p.y,k.r,k.ang);
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*cos(k.ang))*screen->w,
(k.p.y+k.r/2*sin(k.ang))*screen->h,k.r/4*screen->w,0);
}
void drawDollarPath(SDL_Surface* screen,Point* points,int numPoints,
int rad,unsigned int col){
int i;
@ -203,8 +210,13 @@ float bestDollarDifference(Point* points,Point* templ) {
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);
}
float dollarRecognize(SDL_Surface* screen, DollarPath path,int *bestTempl) {
@ -333,15 +345,20 @@ void DrawScreen(SDL_Surface* screen, int h)
}
drawCircle(screen,mousx,mousy,-30,0xFFFFFF);
drawLine(screen,0,0,screen->w,screen->h,0xFFFFFF);
int i;
//draw Touch History
TouchPoint gestureLast[MAXFINGERS];
//printf("------------------Start History------------------\n");
for(i = 0;i < MAXFINGERS;i++) {
gestureLast[i].id = -1;
#ifdef DRAW_VECTOR_EST
gestureLine[i].points = 0;
#endif
gestureLast[i].f.id = -1;
}
for(i = SDL_max(0,eventWrite - EVENT_BUF_SIZE);i != eventWrite;i++) {
int numDownFingers = 0;
Point centroid;
float gdtheta,gdDist;
for(i = SDL_max(0,eventWrite - EVENT_BUF_SIZE);i < eventWrite;i++) {
SDL_Event event = events[i&(EVENT_BUF_SIZE-1)];
int age = eventWrite - i - 1;
if(event.type == SDL_FINGERMOTION ||
@ -355,28 +372,20 @@ void DrawScreen(SDL_Surface* screen, int h)
int j,empty = -1;
for(j = 0;j<MAXFINGERS;j++) {
if(gestureLast[j].id == event.tfinger.fingerId) {
if(gestureLast[j].f.id == event.tfinger.fingerId) {
if(event.type == SDL_FINGERUP) {
#ifdef DRAW_VECTOR_EST
if(gestureLine[j].points > 0)
drawLine(screen,
gestureLine[j].s.x*screen->w,
gestureLine[j].s.y*screen->h,
(gestureLine[j].s.x +50*gestureLine[j].d.x)*screen->w,
(gestureLine[j].s.y +50*gestureLine[j].d.y)*screen->h,
0xFF00);
gestureLine[j].points = 0;
#endif
numDownFingers--;
if(numDownFingers <= 1) {
gdtheta = 0;
gdDist = 0;
}
if(!keystat[32]){ //spacebar
int bestTempl;
float error = dollarRecognize(screen,dollarPath[j],&bestTempl);
if(bestTempl >= 0){
drawDollarPath(screen,dollarTemplate[bestTempl]
,DOLLARNPOINTS,-15,0x0066FF);
printf("ERROR: %f\n",error);
printf("Dollar error: %f\n",error);
}
}
@ -384,8 +393,8 @@ void DrawScreen(SDL_Surface* screen, int h)
dollarNormalize(dollarPath[j],
dollarTemplate[numDollarTemplates]);
int k;
/*
int k;
for(k = 0;k<DOLLARNPOINTS;k++) {
printf("(%f,%f)\n",dollarTemplate[numDollarTemplates][i].x,
dollarTemplate[numDollarTemplates][i].y);
@ -393,67 +402,82 @@ void DrawScreen(SDL_Surface* screen, int h)
numDollarTemplates++;
}
gestureLast[j].id = -1;
gestureLast[j].f.id = -1;
break;
}
else {
#ifdef DRAW_VECTOR_EST
if(gestureLine[j].points == 1) {
gestureLine[j].d.x = x - gestureLine[j].s.x;
gestureLine[j].d.y = y - gestureLine[j].s.y;
}
gestureLine[j].s.x = gestureLine[j].s.x*gestureLine[j].points+x;
gestureLine[j].s.y = gestureLine[j].s.y*gestureLine[j].points+y;
gestureLine[j].d.x = gestureLine[j].d.x*gestureLine[j].points+
x - gestureLast[j].p.x;
gestureLine[j].d.y = gestureLine[j].d.y*gestureLine[j].points+
y - gestureLast[j].p.y;;
gestureLine[j].points++;
gestureLine[j].s.x /= gestureLine[j].points;
gestureLine[j].s.y /= gestureLine[j].points;
gestureLine[j].d.x /= gestureLine[j].points;
gestureLine[j].d.y /= gestureLine[j].points;
#endif
dollarPath[j].p[dollarPath[j].numPoints].x = x;
dollarPath[j].p[dollarPath[j].numPoints].y = y;
float dx = (dollarPath[j].p[dollarPath[j].numPoints-1].x-
dollarPath[j].p[dollarPath[j].numPoints ].x);
float dy = (dollarPath[j].p[dollarPath[j].numPoints-1].y-
dollarPath[j].p[dollarPath[j].numPoints ].y);
float dx = (dollarPath[j].p[dollarPath[j].numPoints ].x-
dollarPath[j].p[dollarPath[j].numPoints-1].x);
float dy = (dollarPath[j].p[dollarPath[j].numPoints ].y-
dollarPath[j].p[dollarPath[j].numPoints-1].y);
dollarPath[j].length += sqrt(dx*dx + dy*dy);
dollarPath[j].numPoints++;
centroid.x = centroid.x + dx/numDownFingers;
centroid.y = centroid.y + dy/numDownFingers;
if(numDownFingers > 1) {
Point lv; //Vector from centroid to last x,y position
Point v; //Vector from centroid to current x,y position
lv.x = gestureLast[j].cv.x;
lv.y = gestureLast[j].cv.y;
float lDist = sqrt(lv.x*lv.x + lv.y*lv.y);
gestureLast[j].p.x = x;
gestureLast[j].p.y = y;
v.x = x - centroid.x;
v.y = y - centroid.y;
gestureLast[j].cv = v;
float Dist = sqrt(v.x*v.x+v.y*v.y);
// cos(dTheta) = (v . lv)/(|v| * |lv|)
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 = (lDist - Dist);
gestureLast[j].dDist = dDist;
gestureLast[j].dtheta = dtheta;
//gdtheta = gdtheta*.9 + dtheta*.1;
//gdDist = gdDist*.9 + dDist*.1
gdtheta += dtheta;
gdDist += dDist;
//printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist);
//printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist);
}
else {
gestureLast[j].dDist = 0;
gestureLast[j].dtheta = 0;
gestureLast[j].cv.x = 0;
gestureLast[j].cv.y = 0;
}
gestureLast[j].f.p.x = x;
gestureLast[j].f.p.y = y;
break;
//pressure?
}
}
else if(gestureLast[j].id == -1 && empty == -1) {
else if(gestureLast[j].f.id == -1 && empty == -1) {
empty = j;
}
}
if(j >= MAXFINGERS && empty >= 0) {
// printf("Finger Down!!!\n");
j = empty; //important that j is the index of the added finger
gestureLast[j].id = event.tfinger.fingerId;
gestureLast[j].p.x = x;
gestureLast[j].p.y = y;
#ifdef DRAW_VECTOR_EST
gestureLine[j].s.x = x;
gestureLine[j].s.y = y;
gestureLine[j].points = 1;
#endif
numDownFingers++;
centroid.x = (centroid.x*(numDownFingers - 1) + x)/numDownFingers;
centroid.y = (centroid.y*(numDownFingers - 1) + y)/numDownFingers;
j = empty;
gestureLast[j].f.id = event.tfinger.fingerId;
gestureLast[j].f.p.x = x;
gestureLast[j].f.p.y = y;
dollarPath[j].length = 0;
dollarPath[j].p[0].x = x;
@ -461,25 +485,27 @@ void DrawScreen(SDL_Surface* screen, int h)
dollarPath[j].numPoints = 1;
}
//draw the touch && each centroid:
//draw the touch:
if(gestureLast[j].id < 0) continue; //Finger up. Or some error...
int k;
for(k = 0; k < MAXFINGERS;k++) {
if(gestureLast[k].id < 0) continue;
//printf("k = %i, id: %i\n",k,gestureLast[k].id);
//colors have no alpha, so shouldn't overflow
unsigned int c = (colors[gestureLast[j].id%7] +
colors[gestureLast[k].id%7])/2;
if(gestureLast[j].f.id < 0) continue; //Finger up. Or some error...
unsigned int c = colors[gestureLast[j].f.id%7];
unsigned int col =
((unsigned int)(c*(.1+.85))) |
((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
x = (gestureLast[j].p.x + gestureLast[k].p.x)/2;
y = (gestureLast[j].p.y + gestureLast[k].p.y)/2;
x = gestureLast[j].f.p.x;
y = gestureLast[j].f.p.y;
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);
//if there is a centroid, draw it
if(numDownFingers > 1) {
unsigned int col =
((unsigned int)(0xFFFFFF)) |
((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
drawCircle(screen,centroid.x*screen->w,centroid.y*screen->h,5,col);
}
}
}
@ -495,8 +521,12 @@ void DrawScreen(SDL_Surface* screen, int h)
,20,0xFF);
keystat[32] = 0;
if(knob.p.x > 0)
drawKnob(screen,knob);
if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
SDL_Flip(screen);
@ -516,6 +546,17 @@ int main(int argc, char* argv[])
int keypress = 0;
int h=0,s=1,i,j;
//gesture variables
int numDownFingers = 0;
float gdtheta = 0,gdDist = 0;
Point centroid;
knob.r = .1;
knob.ang = 0;
TouchPoint gestureLast[MAXFINGERS];
for(i = 0;i < MAXFINGERS;i++)
gestureLast[i].f.id = -1;
memset(keystat,0,512*sizeof(keystat[0]));
if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
@ -585,11 +626,12 @@ int main(int argc, char* argv[])
finger[i].pressure =
((float)event.tfinger.pressure)/inTouch->pressureres;
/*
printf("Finger: %i, Pressure: %f Pressureres: %i\n",
event.tfinger.fingerId,
finger[i].pressure,
inTouch->pressureres);
*/
//printf("Finger: %i, pressure: %f\n",event.tfinger.fingerId,
// finger[event.tfinger.fingerId].pressure);
}
@ -619,10 +661,107 @@ int main(int argc, char* argv[])
finger[i].p.y = -1;
break;
}
if(event.type == SDL_FINGERMOTION ||
event.type == SDL_FINGERDOWN ||
event.type == SDL_FINGERUP) {
SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
//SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
float x = ((float)event.tfinger.x)/inTouch->xres;
float y = ((float)event.tfinger.y)/inTouch->yres;
int j,empty = -1;
for(j = 0;j<MAXFINGERS;j++) {
if(gestureLast[j].f.id == event.tfinger.fingerId) {
if(event.type == SDL_FINGERUP) {
numDownFingers--;
if(numDownFingers <= 1) {
gdtheta = 0;
gdDist = 0;
}
gestureLast[j].f.id = -1;
break;
}
else {
float dx = x - gestureLast[j].f.p.x;
float dy = y - gestureLast[j].f.p.y;
centroid.x = centroid.x + dx/numDownFingers;
centroid.y = centroid.y + dy/numDownFingers;
if(numDownFingers > 1) {
Point lv; //Vector from centroid to last x,y position
Point v; //Vector from centroid to current x,y position
lv = gestureLast[j].cv;
float lDist = sqrt(lv.x*lv.x + lv.y*lv.y);
printf("lDist = %f\n",lDist);
v.x = x - centroid.x;
v.y = y - centroid.y;
gestureLast[j].cv = v;
float Dist = sqrt(v.x*v.x+v.y*v.y);
// cos(dTheta) = (v . lv)/(|v| * |lv|)
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;}
gestureLast[j].dDist = dDist;
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);
}
else {
gestureLast[j].dDist = 0;
gestureLast[j].dtheta = 0;
gestureLast[j].cv.x = 0;
gestureLast[j].cv.y = 0;
}
gestureLast[j].f.p.x = x;
gestureLast[j].f.p.y = y;
break;
//pressure?
}
}
else if(gestureLast[j].f.id == -1 && empty == -1) {
empty = j;
}
}
if(j >= MAXFINGERS && empty >= 0) {
printf("Finger Down!!!\n");
numDownFingers++;
centroid.x = (centroid.x*(numDownFingers - 1) + x)/numDownFingers;
centroid.y = (centroid.y*(numDownFingers - 1) + y)/numDownFingers;
j = empty;
gestureLast[j].f.id = event.tfinger.fingerId;
gestureLast[j].f.p.x = x;
gestureLast[j].f.p.y = y;
gestureLast[j].cv.x = 0;
gestureLast[j].cv.y = 0;
}
//draw the touch:
}
//And draw
if(numDownFingers > 1)
knob.p = centroid;
else
knob.p.x = -1;
}
DrawScreen(screen,h);
//printf("c: (%f,%f)\n",centroid.x,centroid.y);
//printf("numDownFingers: %i\n",numDownFingers);
//for(i=0;i<512;i++)
// if(keystat[i]) printf("%i\n",i);