687 lines
17 KiB
C
687 lines
17 KiB
C
#include <stdio.h>
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#include <SDL.h>
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#include <math.h>
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#include <SDL_touch.h>
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#define PI 3.1415926535897
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#define PHI ((sqrt(5)-1)/2)
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#define WIDTH 640
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#define HEIGHT 480
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#define BPP 4
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#define DEPTH 32
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#define MAXFINGERS 3
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#define DOLLARNPOINTS 64
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#define DOLLARSIZE 256
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//MUST BE A POWER OF 2!
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#define EVENT_BUF_SIZE 256
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SDL_Event events[EVENT_BUF_SIZE];
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int eventWrite;
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int mousx,mousy;
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int keystat[512];
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int bstatus;
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int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
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int index2fingerid[MAXFINGERS];
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int fingersDown;
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typedef struct {
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float x,y;
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} Point;
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typedef struct {
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Point p;
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float pressure;
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int id;
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} Finger;
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typedef struct {
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Finger f;
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Point cv;
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float dtheta,dDist;
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} TouchPoint;
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typedef struct { //dt + s
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Point d,s; //direction, start
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int points;
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} Line;
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typedef struct {
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float length;
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int numPoints;
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Point p[EVENT_BUF_SIZE]; //To be safe
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} DollarPath;
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typedef struct {
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float ang,r;
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Point p;
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} Knob;
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Knob knob;
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Finger finger[MAXFINGERS];
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DollarPath dollarPath[MAXFINGERS];
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#define MAXTEMPLATES 4
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Point dollarTemplate[MAXTEMPLATES][DOLLARNPOINTS];
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int numDollarTemplates = 0;
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#ifdef DRAW_VECTOR_EST
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Line gestureLine[MAXFINGERS];
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#endif
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void handler (int sig)
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{
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printf ("\exiting...(%d)\n", sig);
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exit (0);
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}
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void perror_exit (char *error)
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{
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perror (error);
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handler (9);
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}
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void setpix(SDL_Surface *screen, int x, int y, unsigned int col)
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{
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Uint32 *pixmem32;
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Uint32 colour;
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if((unsigned)x > screen->w) return;
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if((unsigned)y > screen->h) return;
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pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
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Uint8 r,g,b;
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float a;
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memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
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SDL_GetRGB(colour,screen->format,&r,&g,&b); //Always returns 0xFFFFFF?
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//r = 0;g = 0; b = 0;
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a = (col>>24)&0xFF;
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if(a == 0) a = 0xFF; //Hack, to make things easier.
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a /= 0xFF;
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r = r*(1-a) + ((col>>16)&0xFF)*(a);
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g = g*(1-a) + ((col>> 8)&0xFF)*(a);
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b = b*(1-a) + ((col>> 0)&0xFF)*(a);
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colour = SDL_MapRGB( screen->format,r, g, b);
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*pixmem32 = colour;
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}
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void drawLine(SDL_Surface *screen,int x0,int y0,int x1,int y1,unsigned int col) {
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float t;
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for(t=0;t<1;t+=1.f/SDL_max(abs(x0-x1),abs(y0-y1)))
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setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
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}
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void drawCircle(SDL_Surface* screen,int x,int y,int r,unsigned int c)
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{
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float a;
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int tx;
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int ty;
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float xr;
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for(ty = -abs(r);ty <= abs(r);ty++) {
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xr = sqrt(r*r - ty*ty);
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if(r > 0) { //r > 0 ==> filled circle
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for(tx=-xr+.5;tx<=xr-.5;tx++) {
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setpix(screen,x+tx,y+ty,c);
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}
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}
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else {
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setpix(screen,x-xr+.5,y+ty,c);
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setpix(screen,x+xr-.5,y+ty,c);
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}
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}
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}
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void drawKnob(SDL_Surface* screen,Knob k) {
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//printf("Knob: x = %f, y = %f, r = %f, a = %f\n",k.p.x,k.p.y,k.r,k.ang);
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drawCircle(screen,k.p.x*screen->w,k.p.y*screen->h,k.r*screen->w,0xFFFFFF);
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drawCircle(screen,(k.p.x+k.r/2*cos(k.ang))*screen->w,
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(k.p.y+k.r/2*sin(k.ang))*screen->h,k.r/4*screen->w,0);
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}
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void drawDollarPath(SDL_Surface* screen,Point* points,int numPoints,
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int rad,unsigned int col){
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int i;
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for(i=0;i<numPoints;i++) {
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drawCircle(screen,points[i].x+screen->w/2,
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points[i].y+screen->h/2,
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rad,col);
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}
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}
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float dollarDifference(Point* points,Point* templ,float ang) {
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// Point p[DOLLARNPOINTS];
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float dist = 0;
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Point p;
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int i;
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for(i = 0; i < DOLLARNPOINTS; i++) {
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p.x = points[i].x * cos(ang) - points[i].y * sin(ang);
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p.y = points[i].x * sin(ang) + points[i].y * cos(ang);
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dist += sqrt((p.x-templ[i].x)*(p.x-templ[i].x)+
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(p.y-templ[i].y)*(p.y-templ[i].y));
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}
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return dist/DOLLARNPOINTS;
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}
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float bestDollarDifference(Point* points,Point* templ) {
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//------------BEGIN DOLLAR BLACKBOX----------------//
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//-TRANSLATED DIRECTLY FROM PSUDEO-CODE AVAILABLE AT-//
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//-"http://depts.washington.edu/aimgroup/proj/dollar/"-//
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float ta = -PI/4;
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float tb = PI/4;
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float dt = PI/90;
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float x1 = PHI*ta + (1-PHI)*tb;
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float f1 = dollarDifference(points,templ,x1);
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float x2 = (1-PHI)*ta + PHI*tb;
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float f2 = dollarDifference(points,templ,x2);
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while(abs(ta-tb) > dt) {
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if(f1 < f2) {
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tb = x2;
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x2 = x1;
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f2 = f1;
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x1 = PHI*ta + (1-PHI)*tb;
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f1 = dollarDifference(points,templ,x1);
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}
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else {
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ta = x1;
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x1 = x2;
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f1 = f2;
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x2 = (1-PHI)*ta + PHI*tb;
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f2 = dollarDifference(points,templ,x2);
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}
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}
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/*
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if(f1 <= f2)
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printf("Min angle (x1): %f\n",x1);
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else if(f1 > f2)
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printf("Min angle (x2): %f\n",x2);
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*/
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return SDL_min(f1,f2);
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}
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float dollarRecognize(SDL_Surface* screen, DollarPath path,int *bestTempl) {
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Point points[DOLLARNPOINTS];
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int numPoints = dollarNormalize(path,points);
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int i;
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int k;
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/*
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for(k = 0;k<DOLLARNPOINTS;k++) {
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printf("(%f,%f)\n",points[k].x,
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points[k].y);
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}
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*/
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drawDollarPath(screen,points,numPoints,-15,0xFF6600);
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int bestDiff = 10000;
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*bestTempl = -1;
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for(i = 0;i < numDollarTemplates;i++) {
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int diff = bestDollarDifference(points,dollarTemplate[i]);
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if(diff < bestDiff) {bestDiff = diff; *bestTempl = i;}
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}
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return bestDiff;
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}
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//DollarPath contains raw points, plus (possibly) the calculated length
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int dollarNormalize(DollarPath path,Point *points) {
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int i;
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//Calculate length if it hasn't already been done
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if(path.length <= 0) {
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for(i=1;i<path.numPoints;i++) {
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float dx = path.p[i ].x -
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path.p[i-1].x;
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float dy = path.p[i ].y -
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path.p[i-1].y;
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path.length += sqrt(dx*dx+dy*dy);
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}
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}
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//Resample
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float interval = path.length/(DOLLARNPOINTS - 1);
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float dist = 0;
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int numPoints = 0;
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Point centroid; centroid.x = 0;centroid.y = 0;
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//printf("(%f,%f)\n",path.p[path.numPoints-1].x,path.p[path.numPoints-1].y);
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for(i = 1;i < path.numPoints;i++) {
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float d = sqrt((path.p[i-1].x-path.p[i].x)*(path.p[i-1].x-path.p[i].x)+
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(path.p[i-1].y-path.p[i].y)*(path.p[i-1].y-path.p[i].y));
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//printf("d = %f dist = %f/%f\n",d,dist,interval);
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while(dist + d > interval) {
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points[numPoints].x = path.p[i-1].x +
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((interval-dist)/d)*(path.p[i].x-path.p[i-1].x);
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points[numPoints].y = path.p[i-1].y +
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((interval-dist)/d)*(path.p[i].y-path.p[i-1].y);
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centroid.x += points[numPoints].x;
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centroid.y += points[numPoints].y;
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numPoints++;
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dist -= interval;
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}
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dist += d;
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}
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if(numPoints < 1) return 0;
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centroid.x /= numPoints;
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centroid.y /= numPoints;
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//printf("Centroid (%f,%f)",centroid.x,centroid.y);
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//Rotate Points so point 0 is left of centroid and solve for the bounding box
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float xmin,xmax,ymin,ymax;
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xmin = centroid.x;
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xmax = centroid.x;
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ymin = centroid.y;
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ymax = centroid.y;
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float ang = atan2(centroid.y - points[0].y,
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centroid.x - points[0].x);
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for(i = 0;i<numPoints;i++) {
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float px = points[i].x;
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float py = points[i].y;
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points[i].x = (px - centroid.x)*cos(ang) -
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(py - centroid.y)*sin(ang) + centroid.x;
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points[i].y = (px - centroid.x)*sin(ang) +
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(py - centroid.y)*cos(ang) + centroid.y;
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if(points[i].x < xmin) xmin = points[i].x;
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if(points[i].x > xmax) xmax = points[i].x;
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if(points[i].y < ymin) ymin = points[i].y;
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if(points[i].y > ymax) ymax = points[i].y;
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}
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//Scale points to DOLLARSIZE, and translate to the origin
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float w = xmax-xmin;
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float h = ymax-ymin;
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for(i=0;i<numPoints;i++) {
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points[i].x = (points[i].x - centroid.x)*DOLLARSIZE/w;
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points[i].y = (points[i].y - centroid.y)*DOLLARSIZE/h;
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}
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return numPoints;
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}
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void DrawScreen(SDL_Surface* screen, int h)
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{
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int x, y, xm,ym,c;
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if(SDL_MUSTLOCK(screen))
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{
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if(SDL_LockSurface(screen) < 0) return;
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}
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for(y = 0; y < screen->h; y++ )
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{
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for( x = 0; x < screen->w; x++ )
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{
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//setpixel(screen, x, y, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
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//xm = (x+h)%screen->w;
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//ym = (y+h)%screen->w;
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//c = sin(h/256*2*PI)*x*y/screen->w/screen->h;
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//setpix(screen,x,y,255*sin(xm/screen->w*2*PI),sin(h/255*2*PI)*255*y/screen->h,c);
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setpix(screen,x,y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
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//setpix(screen,x,y,0); //Inefficient, but that's okay...
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}
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}
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drawCircle(screen,mousx,mousy,-30,0xFFFFFF);
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drawLine(screen,0,0,screen->w,screen->h,0xFFFFFF);
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int i;
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//draw Touch History
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TouchPoint gestureLast[MAXFINGERS];
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//printf("------------------Start History------------------\n");
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for(i = 0;i < MAXFINGERS;i++) {
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gestureLast[i].f.id = -1;
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}
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int numDownFingers = 0;
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Point centroid;
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float gdtheta,gdDist;
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for(i = SDL_max(0,eventWrite - EVENT_BUF_SIZE);i < eventWrite;i++) {
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SDL_Event event = events[i&(EVENT_BUF_SIZE-1)];
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int age = eventWrite - i - 1;
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if(event.type == SDL_FINGERMOTION ||
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event.type == SDL_FINGERDOWN ||
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event.type == SDL_FINGERUP) {
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SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
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//SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
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float x = ((float)event.tfinger.x)/inTouch->xres;
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float y = ((float)event.tfinger.y)/inTouch->yres;
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int j,empty = -1;
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for(j = 0;j<MAXFINGERS;j++) {
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if(gestureLast[j].f.id == event.tfinger.fingerId) {
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if(event.type == SDL_FINGERUP) {
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numDownFingers--;
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if(numDownFingers <= 1) {
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gdtheta = 0;
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gdDist = 0;
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}
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if(!keystat[32]){ //spacebar
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int bestTempl;
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float error = dollarRecognize(screen,dollarPath[j],&bestTempl);
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if(bestTempl >= 0){
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drawDollarPath(screen,dollarTemplate[bestTempl]
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,DOLLARNPOINTS,-15,0x0066FF);
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printf("Dollar error: %f\n",error);
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}
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}
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else if(numDollarTemplates < MAXTEMPLATES) {
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dollarNormalize(dollarPath[j],
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dollarTemplate[numDollarTemplates]);
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/*
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int k;
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for(k = 0;k<DOLLARNPOINTS;k++) {
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printf("(%f,%f)\n",dollarTemplate[numDollarTemplates][i].x,
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dollarTemplate[numDollarTemplates][i].y);
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}*/
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numDollarTemplates++;
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}
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gestureLast[j].f.id = -1;
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break;
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}
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else {
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dollarPath[j].p[dollarPath[j].numPoints].x = x;
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dollarPath[j].p[dollarPath[j].numPoints].y = y;
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float dx = (dollarPath[j].p[dollarPath[j].numPoints ].x-
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dollarPath[j].p[dollarPath[j].numPoints-1].x);
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float dy = (dollarPath[j].p[dollarPath[j].numPoints ].y-
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dollarPath[j].p[dollarPath[j].numPoints-1].y);
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dollarPath[j].length += sqrt(dx*dx + dy*dy);
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dollarPath[j].numPoints++;
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centroid.x = centroid.x + dx/numDownFingers;
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centroid.y = centroid.y + dy/numDownFingers;
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if(numDownFingers > 1) {
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Point lv; //Vector from centroid to last x,y position
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Point v; //Vector from centroid to current x,y position
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lv.x = gestureLast[j].cv.x;
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lv.y = gestureLast[j].cv.y;
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float lDist = sqrt(lv.x*lv.x + lv.y*lv.y);
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v.x = x - centroid.x;
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v.y = y - centroid.y;
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gestureLast[j].cv = v;
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float Dist = sqrt(v.x*v.x+v.y*v.y);
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// cos(dTheta) = (v . lv)/(|v| * |lv|)
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lv.x/=lDist;
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lv.y/=lDist;
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v.x/=Dist;
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v.y/=Dist;
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float dtheta = atan2(lv.x*v.y - lv.y*v.x,lv.x*v.x + lv.y*v.y);
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float dDist = (lDist - Dist);
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gestureLast[j].dDist = dDist;
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gestureLast[j].dtheta = dtheta;
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//gdtheta = gdtheta*.9 + dtheta*.1;
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//gdDist = gdDist*.9 + dDist*.1
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gdtheta += dtheta;
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gdDist += dDist;
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//printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist);
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//printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist);
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}
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else {
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gestureLast[j].dDist = 0;
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gestureLast[j].dtheta = 0;
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gestureLast[j].cv.x = 0;
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gestureLast[j].cv.y = 0;
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}
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gestureLast[j].f.p.x = x;
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gestureLast[j].f.p.y = y;
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break;
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//pressure?
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}
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}
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else if(gestureLast[j].f.id == -1 && empty == -1) {
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empty = j;
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}
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}
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if(j >= MAXFINGERS && empty >= 0) {
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// printf("Finger Down!!!\n");
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numDownFingers++;
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centroid.x = (centroid.x*(numDownFingers - 1) + x)/numDownFingers;
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centroid.y = (centroid.y*(numDownFingers - 1) + y)/numDownFingers;
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j = empty;
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gestureLast[j].f.id = event.tfinger.fingerId;
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gestureLast[j].f.p.x = x;
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gestureLast[j].f.p.y = y;
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dollarPath[j].length = 0;
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dollarPath[j].p[0].x = x;
|
|
dollarPath[j].p[0].y = y;
|
|
dollarPath[j].numPoints = 1;
|
|
}
|
|
|
|
//draw the touch:
|
|
|
|
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].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);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
for(i=0;i<MAXFINGERS;i++)
|
|
if(finger[i].p.x >= 0 && finger[i].p.y >= 0)
|
|
if(finger[i].pressure > 0)
|
|
drawCircle(screen,finger[i].p.x*screen->w,finger[i].p.y*screen->h
|
|
,20,0xFF*finger[i].pressure);
|
|
else
|
|
drawCircle(screen,finger[i].p.x*screen->w,finger[i].p.y*screen->h
|
|
,20,0xFF);
|
|
|
|
|
|
|
|
keystat[32] = 0;
|
|
|
|
if(knob.p.x > 0)
|
|
drawKnob(screen,knob);
|
|
|
|
if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
|
|
|
|
SDL_Flip(screen);
|
|
}
|
|
|
|
SDL_Surface* initScreen(int width,int height)
|
|
{
|
|
return SDL_SetVideoMode(width, height, DEPTH,
|
|
SDL_HWSURFACE | SDL_RESIZABLE);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
SDL_Surface *screen;
|
|
SDL_Event event;
|
|
|
|
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];
|
|
|
|
|
|
|
|
memset(keystat,0,512*sizeof(keystat[0]));
|
|
if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
|
|
|
|
if (!(screen = initScreen(WIDTH,HEIGHT)))
|
|
{
|
|
SDL_Quit();
|
|
return 1;
|
|
}
|
|
|
|
while(!keystat[27]) {
|
|
//Poll SDL
|
|
while(SDL_PollEvent(&event))
|
|
{
|
|
//Record _all_ events
|
|
events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
|
|
eventWrite++;
|
|
|
|
switch (event.type)
|
|
{
|
|
case SDL_QUIT:
|
|
keystat[27] = 1;
|
|
break;
|
|
case SDL_KEYDOWN:
|
|
//printf("%i\n",event.key.keysym.sym);
|
|
keystat[event.key.keysym.sym] = 1;
|
|
//keypress = 1;
|
|
break;
|
|
case SDL_KEYUP:
|
|
//printf("%i\n",event.key.keysym.sym);
|
|
keystat[event.key.keysym.sym] = 0;
|
|
//keypress = 1;
|
|
break;
|
|
case SDL_VIDEORESIZE:
|
|
if (!(screen = initScreen(event.resize.w,
|
|
event.resize.h)))
|
|
{
|
|
SDL_Quit();
|
|
return 1;
|
|
}
|
|
break;
|
|
case SDL_MOUSEMOTION:
|
|
mousx = event.motion.x;
|
|
mousy = event.motion.y;
|
|
break;
|
|
case SDL_MOUSEBUTTONDOWN:
|
|
bstatus |= (1<<(event.button.button-1));
|
|
break;
|
|
case SDL_MOUSEBUTTONUP:
|
|
bstatus &= ~(1<<(event.button.button-1));
|
|
break;
|
|
case SDL_FINGERMOTION:
|
|
;
|
|
//printf("Finger: %i,x: %i, y: %i\n",event.tfinger.fingerId,
|
|
// event.tfinger.x,event.tfinger.y);
|
|
SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
|
|
SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
|
|
|
|
for(i = 0;i<MAXFINGERS;i++)
|
|
if(index2fingerid[i] == event.tfinger.fingerId)
|
|
break;
|
|
if(i == MAXFINGERS) break;
|
|
if(inTouch > 0) {
|
|
finger[i].p.x = ((float)event.tfinger.x)/
|
|
inTouch->xres;
|
|
finger[i].p.y = ((float)event.tfinger.y)/
|
|
inTouch->yres;
|
|
|
|
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);
|
|
}
|
|
|
|
break;
|
|
case SDL_FINGERDOWN:
|
|
printf("Finger: %i down - x: %i, y: %i\n",event.tfinger.fingerId,
|
|
event.tfinger.x,event.tfinger.y);
|
|
|
|
for(i = 0;i<MAXFINGERS;i++)
|
|
if(index2fingerid[i] == -1) {
|
|
index2fingerid[i] = event.tfinger.fingerId;
|
|
break;
|
|
}
|
|
finger[i].p.x = event.tfinger.x;
|
|
finger[i].p.y = event.tfinger.y;
|
|
break;
|
|
case SDL_FINGERUP:
|
|
printf("Figner: %i up - x: %i, y: %i\n",event.tfinger.fingerId,
|
|
event.tfinger.x,event.tfinger.y);
|
|
for(i = 0;i<MAXFINGERS;i++)
|
|
if(index2fingerid[i] == event.tfinger.fingerId) {
|
|
index2fingerid[i] = -1;
|
|
break;
|
|
}
|
|
finger[i].p.x = -1;
|
|
finger[i].p.y = -1;
|
|
break;
|
|
case SDL_MULTIGESTURE:
|
|
knob.p.x = event.mgesture.x;
|
|
knob.p.y = event.mgesture.y;
|
|
knob.ang += event.mgesture.dTheta;
|
|
knob.r += event.mgesture.dDist;
|
|
}
|
|
|
|
|
|
|
|
//And draw
|
|
|
|
}
|
|
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);
|
|
|
|
|
|
}
|
|
SDL_Quit();
|
|
|
|
return 0;
|
|
}
|
|
|