This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testgesture.c
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/* Usage:
* Spacebar to begin recording a gesture on all touches.
* s to save all touches into "./gestureSave"
* l to load all touches from "./gestureSave"
*/
#include <stdio.h>
#include <SDL.h>
#include <math.h>
#include <SDL_touch.h>
#include <SDL_gesture.h>
/* 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
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#ifdef __WIN32__
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#define PRIs64 "I64"
#else
#define PRIs64 "lld"
#endif
#endif
#ifndef PRIu64
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#ifdef __WIN32__
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#define PRIu64 "I64u"
#else
#define PRIu64 "llu"
#endif
#endif
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32
//MUST BE A POWER OF 2!
#define EVENT_BUF_SIZE 256
#define VERBOSE SDL_FALSE
SDL_Event events[EVENT_BUF_SIZE];
int eventWrite;
int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
typedef struct {
float x,y;
} Point;
typedef struct {
float ang,r;
Point p;
} Knob;
Knob knob;
void handler (int sig)
{
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printf ("exiting...(%d)\n", sig);
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exit (0);
}
void perror_exit (char *error)
{
perror (error);
handler (9);
}
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void setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
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{
Uint32 *pixmem32;
Uint32 colour;
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Uint8 r,g,b;
int x = (int)_x;
int y = (int)_y;
float a;
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if(x < 0 || x > screen->w) return;
if(y < 0 || y > screen->h) return;
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pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
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SDL_memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
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SDL_GetRGB(colour,screen->format,&r,&g,&b);
//r = 0;g = 0; b = 0;
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a = (float)((col>>24)&0xFF);
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if(a == 0) a = 0xFF; //Hack, to make things easier.
a /= 0xFF;
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r = (Uint8)(r*(1-a) + ((col>>16)&0xFF)*(a));
g = (Uint8)(g*(1-a) + ((col>> 8)&0xFF)*(a));
b = (Uint8)(b*(1-a) + ((col>> 0)&0xFF)*(a));
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colour = SDL_MapRGB( screen->format,r, g, b);
*pixmem32 = colour;
}
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void drawLine(SDL_Surface *screen,float x0,float y0,float x1,float y1,unsigned int col) {
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for(t=0;t<1;t+=(float)(1.f/SDL_max(SDL_fabs(x0-x1),SDL_fabs(y0-y1))))
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setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
}
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void drawCircle(SDL_Surface* screen,float x,float y,float r,unsigned int c)
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float tx,ty;
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for(ty = (float)-SDL_fabs(r);ty <= (float)SDL_fabs((int)r);ty++) {
xr = (float)sqrt(r*r - ty*ty);
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if(r > 0) { //r > 0 ==> filled circle
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for(tx=-xr+.5f;tx<=xr-.5;tx++) {
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setpix(screen,x+tx,y+ty,c);
}
}
else {
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setpix(screen,x-xr+.5f,y+ty,c);
setpix(screen,x+xr-.5f,y+ty,c);
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}
}
}
void drawKnob(SDL_Surface* screen,Knob k) {
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*cosf(k.ang))*screen->w,
(k.p.y+k.r/2*sinf(k.ang))*screen->h,k.r/4*screen->w,0);
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}
void DrawScreen(SDL_Surface* screen)
{
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int x, y, i;
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if(SDL_MUSTLOCK(screen))
{
if(SDL_LockSurface(screen) < 0) return;
}
for(y = 0;y < screen->h;y++)
for(x = 0;x < screen->w;x++)
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setpix(screen,(float)x,(float)y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
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//draw Touch History
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;
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float x, y;
unsigned int c, col;
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if(event.type == SDL_FINGERMOTION ||
event.type == SDL_FINGERDOWN ||
event.type == SDL_FINGERUP) {
SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
if(inTouch == NULL) continue;
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x = ((float)event.tfinger.x)/inTouch->xres;
y = ((float)event.tfinger.y)/inTouch->yres;
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//draw the touch:
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c = colors[event.tfinger.touchId%7];
col =
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((unsigned int)(c*(.1+.85))) |
((unsigned int)((0xFF*(1-((float)age)/EVENT_BUF_SIZE))) & 0xFF)<<24;
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(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;
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SDL_bool quitting = SDL_FALSE;
SDL_RWops *src;
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//gesture variables
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knob.r = .1f;
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knob.ang = 0;
if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
if (!(screen = initScreen(WIDTH,HEIGHT)))
{
SDL_Quit();
return 1;
}
while(!quitting) {
while(SDL_PollEvent(&event))
{
//Record _all_ events
events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
eventWrite++;
switch (event.type)
{
case SDL_QUIT:
quitting = SDL_TRUE;
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym)
{
case SDLK_SPACE:
SDL_RecordGesture(-1);
break;
case SDLK_s:
src = SDL_RWFromFile("gestureSave","w");
printf("Wrote %i templates\n",SDL_SaveAllDollarTemplates(src));
SDL_RWclose(src);
break;
case SDLK_l:
src = SDL_RWFromFile("gestureSave","r");
printf("Loaded: %i\n",SDL_LoadDollarTemplates(-1,src));
SDL_RWclose(src);
break;
case SDLK_ESCAPE:
quitting = SDL_TRUE;
break;
}
break;
case SDL_VIDEORESIZE:
if (!(screen = initScreen(event.resize.w,
event.resize.h)))
{
SDL_Quit();
return 1;
}
break;
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case SDL_FINGERMOTION:
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#if VERBOSE
printf("Finger: %i,x: %i, y: %i\n",event.tfinger.fingerId,
event.tfinger.x,event.tfinger.y);
#endif
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{
SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId);
SDL_Finger* inFinger = SDL_GetFinger(inTouch,event.tfinger.fingerId);
}
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break;
case SDL_FINGERDOWN:
#if VERBOSE
printf("Finger: %"PRIs64" down - x: %i, y: %i\n",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
#endif
break;
case SDL_FINGERUP:
#if VERBOSE
printf("Finger: %"PRIs64" up - x: %i, y: %i\n",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
#endif
break;
case SDL_MULTIGESTURE:
#if VERBOSE
printf("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f\n",
event.mgesture.x,
event.mgesture.y,
event.mgesture.dTheta,
event.mgesture.dDist);
printf("MG: numDownTouch = %i\n",event.mgesture.numFingers);
#endif
knob.p.x = event.mgesture.x;
knob.p.y = event.mgesture.y;
knob.ang += event.mgesture.dTheta;
knob.r += event.mgesture.dDist;
break;
case SDL_DOLLARGESTURE:
printf("Gesture %"PRIs64" performed, error: %f\n",
event.dgesture.gestureId,
event.dgesture.error);
break;
case SDL_DOLLARRECORD:
printf("Recorded gesture: %"PRIs64"\n",event.dgesture.gestureId);
break;
}
}
DrawScreen(screen);
}
SDL_Quit();
return 0;
}