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gestureSDLTest.c
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#include <stdio.h>
#include <SDL.h>
#include <math.h>
#include <SDL_touch.h>
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#include <SDL_gesture.h>
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/* Make sure we have good macros for printing 32 and 64 bit values */
#ifndef PRIs32
#define PRIs32 "d"
#endif
#ifndef PRIu32
#define PRIu32 "u"
#endif
#ifndef PRIs64
#ifdef __WIN32__
#define PRIs64 "I64"
#else
#define PRIs64 "lld"
#endif
#endif
#ifndef PRIu64
#ifdef __WIN32__
#define PRIu64 "I64u"
#else
#define PRIu64 "llu"
#endif
#endif
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#define PI 3.1415926535897
#define PHI ((sqrt(5)-1)/2)
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32
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#define MAXFINGERS 5
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#define DOLLARNPOINTS 64
#define DOLLARSIZE 256
//MUST BE A POWER OF 2!
#define EVENT_BUF_SIZE 256
SDL_Event events[EVENT_BUF_SIZE];
int eventWrite;
int mousx,mousy;
int keystat[512];
int bstatus;
int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
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SDL_FingerID index2fingerid[MAXFINGERS];
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int fingersDown;
typedef struct {
float x,y;
} Point;
typedef struct {
Point p;
float pressure;
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SDL_FingerID id;
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} Finger;
typedef struct {
Finger f;
Point cv;
float dtheta,dDist;
} TouchPoint;
typedef struct { //dt + s
Point d,s; //direction, start
int points;
} Line;
typedef struct {
float length;
int numPoints;
Point p[EVENT_BUF_SIZE]; //To be safe
} DollarPath;
typedef struct {
float ang,r;
Point p;
} Knob;
Knob knob;
Finger finger[MAXFINGERS];
DollarPath dollarPath[MAXFINGERS];
#define MAXTEMPLATES 4
Point dollarTemplate[MAXTEMPLATES][DOLLARNPOINTS];
int numDollarTemplates = 0;
#ifdef DRAW_VECTOR_EST
Line gestureLine[MAXFINGERS];
#endif
void handler (int sig)
{
printf ("\exiting...(%d)\n", sig);
exit (0);
}
void perror_exit (char *error)
{
perror (error);
handler (9);
}
void setpix(SDL_Surface *screen, int x, int y, unsigned int col)
{
Uint32 *pixmem32;
Uint32 colour;
if((unsigned)x > screen->w) return;
if((unsigned)y > screen->h) return;
pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
Uint8 r,g,b;
float a;
memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
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SDL_GetRGB(colour,screen->format,&r,&g,&b);
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//r = 0;g = 0; b = 0;
a = (col>>24)&0xFF;
if(a == 0) a = 0xFF; //Hack, to make things easier.
a /= 0xFF;
r = r*(1-a) + ((col>>16)&0xFF)*(a);
g = g*(1-a) + ((col>> 8)&0xFF)*(a);
b = b*(1-a) + ((col>> 0)&0xFF)*(a);
colour = SDL_MapRGB( screen->format,r, g, b);
*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)
{
float a;
int tx;
int ty;
float xr;
for(ty = -abs(r);ty <= abs(r);ty++) {
xr = sqrt(r*r - ty*ty);
if(r > 0) { //r > 0 ==> filled circle
for(tx=-xr+.5;tx<=xr-.5;tx++) {
setpix(screen,x+tx,y+ty,c);
}
}
else {
setpix(screen,x-xr+.5,y+ty,c);
setpix(screen,x+xr-.5,y+ty,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 DrawScreen(SDL_Surface* screen, int h)
{
int x, y, xm,ym,c;
if(SDL_MUSTLOCK(screen))
{
if(SDL_LockSurface(screen) < 0) return;
}
for(y = 0; y < screen->h; y++ )
{
for( x = 0; x < screen->w; x++ )
{
//setpixel(screen, x, y, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
//xm = (x+h)%screen->w;
//ym = (y+h)%screen->w;
//c = sin(h/256*2*PI)*x*y/screen->w/screen->h;
//setpix(screen,x,y,255*sin(xm/screen->w*2*PI),sin(h/255*2*PI)*255*y/screen->h,c);
setpix(screen,x,y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
//setpix(screen,x,y,0); //Inefficient, but that's okay...
}
}
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].f.id = -1;
}
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 ||
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;
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float y = ((float)event.tfinger.y)/inTouch->yres;
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//draw the touch:
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unsigned int c = colors[event.tfinger.touchId%7];
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unsigned int col =
((unsigned int)(c*(.1+.85))) |
((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
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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);
}
}
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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);
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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;
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if(event.key.keysym.sym == 32) {
SDL_RecordGesture(-1);
}
else if(event.key.keysym.sym == 115) {
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SDL_RWops *src;
//fp = fopen("gestureSave","w");
src = SDL_RWFromFile("gestureSave","w");
printf("Wrote %i templates\n",SDL_SaveAllDollarTemplates(src));
//fclose(fp);
SDL_RWclose(src);
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}
else if(event.key.keysym.sym == 108) {
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SDL_RWops *src;
//fp = fopen("gestureSave","r");
src = SDL_RWFromFile("gestureSave","r");
printf("Loaded: %i\n",SDL_LoadDollarTemplates(-1,src));
//fclose(fp);
SDL_RWclose(src);
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//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);
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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;
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/*
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);
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break;
case SDL_FINGERDOWN:
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//printf("Finger: %"PRIs64" down - x: %i, y: %i\n",event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
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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:
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//printf("Finger: %"PRIs64" up - x: %i, y: %i\n",event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
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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;
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break;
case SDL_MULTIGESTURE:
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printf("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f\n",
event.mgesture.x,
event.mgesture.y,
event.mgesture.dTheta,
event.mgesture.dDist);
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printf("MG: numDownTouch = %i\n",event.mgesture.numFingers);
*/
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knob.p.x = event.mgesture.x;
knob.p.y = event.mgesture.y;
knob.ang += event.mgesture.dTheta;
knob.r += event.mgesture.dDist;
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break;
case SDL_DOLLARGESTURE:
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printf("Gesture %"PRIs64" performed, error: %f\n",
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event.dgesture.gestureId,
event.dgesture.error);
break;
case SDL_DOLLARRECORD:
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printf("Recorded gesture: %"PRIs64"\n",event.dgesture.gestureId);
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break;
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DrawScreen(screen,h);
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//for(i = 0; i < 256; i++)
// if(keystat[i])
// printf("Key %i down\n",i);
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}
SDL_Quit();
return 0;
}