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Started adding vectorization of touch data.

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This commit is contained in:
Jim Grandpre 2010-06-15 02:12:16 -04:00
parent 9610eb78b6
commit f4e36d6a9b
1 changed files with 54 additions and 2 deletions
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56
touchTest/gestureTest.c
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@ -39,10 +39,16 @@ typedef struct {
int id;
} Finger;
typedef struct { //dt + s
Point d,s; //direction, start
int points;
} Line;
Finger finger[MAXFINGERS];
Finger gestureLast[MAXFINGERS];
Line gestureLine[MAXFINGERS];
void handler (int sig)
{
@ -86,6 +92,11 @@ void setpix(SDL_Surface *screen, int x, int y, unsigned int col)
*pixmem32 = colour;
}
void drawLine(SDL_Surface *screen,int x0,int y0,int x1,int y1,unsigned int col) {
float t;
for(t=0;t<1;t+=1.f/SDL_max(abs(x0-x1),abs(y0-y1)))
setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
}
void drawCircle(SDL_Surface* screen,int x,int y,int r,unsigned int c)
{
@ -145,10 +156,13 @@ 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
for(i = 0;i < MAXFINGERS;i++) gestureLast[i].id = -1;
for(i = 0;i < MAXFINGERS;i++) {
gestureLast[i].id = -1;
gestureLine[i].points = 0;
}
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;
@ -164,10 +178,44 @@ void DrawScreen(SDL_Surface* screen, int h)
for(j = 0;j<MAXFINGERS;j++) {
if(gestureLast[j].id == event.tfinger.fingerId) {
if(event.type == SDL_FINGERUP) {
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;
gestureLast[j].id = -1;
break;
}
else {
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;
gestureLast[j].p.x = x;
gestureLast[j].p.y = y;
break;
@ -185,6 +233,10 @@ void DrawScreen(SDL_Surface* screen, int h)
gestureLast[j].id = event.tfinger.fingerId;
gestureLast[j].p.x = x;
gestureLast[j].p.y = y;
gestureLine[j].s.x = x;
gestureLine[j].s.y = y;
gestureLine[j].points = 1;
}
//draw the touch && each centroid: