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Added gesture test c file. Beginning of gesture recognition.

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jimtla committed Jun 14, 2010
1 parent 02f0a3b commit 3612e6623c82c7ad79859fcc328c7e0afe31fbfa
Showing with 363 additions and 1 deletion.
  1. +1 −1 Makefile.in
  2. +1 −0 touchTest/TODO
  3. +360 −0 touchTest/gestureTest.c
  4. +1 −0 touchTest/makefile
@@ -44,7 +44,7 @@ EMBEDSPU = @EMBEDSPU@

DIST = acinclude autogen.sh Borland.html Borland.zip BUGS build-scripts configure configure.in COPYING CREDITS include INSTALL Makefile.minimal Makefile.in README* sdl-config.in sdl.m4 sdl.pc.in SDL.spec SDL.spec.in src test TODO VisualC.html VisualC VisualCE Watcom-Win32.zip WhatsNew Xcode Xcode-iPhoneOS

HDRS = SDL.h SDL_assert.h SDL_atomic.h SDL_audio.h SDL_compat.h SDL_cpuinfo.h SDL_endian.h SDL_error.h SDL_events.h SDL_haptic.h SDL_joystick.h SDL_keyboard.h SDL_keysym.h SDL_loadso.h SDL_main.h SDL_mouse.h SDL_mutex.h SDL_name.h SDL_opengl.h SDL_opengles.h SDL_pixels.h SDL_platform.h SDL_power.h SDL_quit.h SDL_rect.h SDL_revision.h SDL_rwops.h SDL_scancode.h SDL_stdinc.h SDL_surface.h SDL_syswm.h SDL_thread.h SDL_timer.h SDL_types.h SDL_version.h SDL_video.h begin_code.h close_code.h
HDRS = SDL.h SDL_assert.h SDL_atomic.h SDL_audio.h SDL_compat.h SDL_cpuinfo.h SDL_endian.h SDL_error.h SDL_events.h SDL_haptic.h SDL_joystick.h SDL_keyboard.h SDL_keysym.h SDL_loadso.h SDL_main.h SDL_mouse.h SDL_mutex.h SDL_name.h SDL_opengl.h SDL_opengles.h SDL_pixels.h SDL_platform.h SDL_power.h SDL_quit.h SDL_rect.h SDL_revision.h SDL_rwops.h SDL_scancode.h SDL_stdinc.h SDL_surface.h SDL_syswm.h SDL_thread.h SDL_timer.h SDL_types.h SDL_version.h SDL_video.h begin_code.h close_code.h SDL_touch.h

LT_AGE = @LT_AGE@
LT_CURRENT = @LT_CURRENT@
@@ -0,0 +1 @@
Pressure is sometimes negative
@@ -0,0 +1,360 @@
#include <stdio.h>
#include <SDL.h>
#include <math.h>
#include <SDL_touch.h>

#define PI 3.1415926535897
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32

#define MAXFINGERS 3




//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};

int index2fingerid[MAXFINGERS];
int fingersDown;

typedef struct {
float x,y;
} Point;

typedef struct {
Point p;
float pressure;
int id;
} Finger;


Finger finger[MAXFINGERS];

Finger gestureLast[MAXFINGERS];

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);

SDL_GetRGB(colour,screen->format,&r,&g,&b); //Always returns 0xFFFFFF?
//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 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++) {
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 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);

int i;
//draw Touch History
for(i = 0;i < MAXFINGERS;i++) gestureLast[i].id = -1;
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;
float y = ((float)event.tfinger.y)/inTouch->yres;
int j,empty = -1;
for(j = 0;j<MAXFINGERS;j++) {
if(gestureLast[j].id == event.tfinger.fingerId) {
if(event.type == SDL_FINGERUP) {
gestureLast[j].id = -1;
break;
}
else {
gestureLast[j].p.x = x;
gestureLast[j].p.y = y;
break;
//pressure?
}
}
else if(gestureLast[j].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;
}

//draw the touch && each centroid:

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;
//colors have no alpha, so shouldn't overflow
unsigned int c = (colors[gestureLast[j].id%7] +
colors[gestureLast[k].id%7])/2;
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;
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);
}
}
}


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);




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;

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;
}
}
//And draw
DrawScreen(screen,h);
/*
for(i=0;i<512;i++)
if(keystat[i]) printf("%i\n",i);
printf("Buttons:%i\n",bstatus);
*/
}
SDL_Quit();

return 0;
}
@@ -1,4 +1,5 @@
SDLTest : touchSimp.c touchPong.c
gcc gestureTest.c -o gestureTest `sdl-config --cflags --libs` -g
gcc touchTest.c -o touchTest `sdl-config --cflags --libs` -g
gcc touchSimp.c -o touchSimp `sdl-config --cflags --libs` -g
gcc touchPong.c -o touchPong `sdl-config --cflags --libs` -g

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