This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
touchSimp.c
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#include <stdio.h>
#include <SDL.h>
#include <math.h>
#include <linux/input.h>
#include <fcntl.h>
#define PI 3.1415926535897
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32
#define MAX_FINGERS 2
int mousx,mousy;
int keystat[512];
int bstatus;
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typedef struct {
int x,y;
} Point;
Point finger[MAX_FINGERS];
void handler (int sig)
{
printf ("\nexiting...(%d)\n", sig);
exit (0);
}
void perror_exit (char *error)
{
perror (error);
handler (9);
}
void setpix(SDL_Surface *screen, int x, int y, int col)
{
Uint32 *pixmem32;
Uint32 colour;
if((unsigned)x > screen->w) return;
if((unsigned)y > screen->h) return;
colour = SDL_MapRGB( screen->format, (col>>16)&0xFF, (col>>8)&0xFF, col&0xFF);
pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
*pixmem32 = colour;
}
void drawCircle(SDL_Surface* screen,int x,int y,int r,int c)
{
float a;
for(a=0;a<2*PI;a+=1.f/(float)r)
{
setpix(screen,(int)(x+r*cos(a)),(int)(y+r*sin(a)),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);
}
}
drawCircle(screen,mousx,mousy,30,0xFFFFFF);
int i;
for(i=0;i<MAX_FINGERS;i++)
drawCircle(screen,finger[i].x,finger[i].y,30,0xFFFFFF);
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[])
{
struct input_event ev[64];
int fd, rd, value, size = sizeof (struct input_event);
char name[256] = "Unknown";
char *device = NULL;
//Setup check
if (argv[1] == NULL){
printf("Please specify (on the command line) the path to the dev event interface device\n");
exit (0);
}
if ((getuid ()) != 0)
printf ("You are not root! This may not work...\n");
if (argc > 1)
device = argv[1];
//Open Device
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if ((fd = open (device, O_RDONLY | O_NONBLOCK)) == -1)
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printf ("%s is not a vaild device.\n", device);
//Print Device Name
ioctl (fd, EVIOCGNAME (sizeof (name)), name);
printf ("Reading From : %s (%s)\n", device, name);
SDL_Surface *screen;
SDL_Event event;
int keypress = 0;
int h=0,s=1,i,j;
int tx,ty,curf=0;
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))
{
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;
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case SDL_FINGERMOTION:
printf("Holy SH!T\n");
break;
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}
}
//poll for Touch <- Goal: make this a case:
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/*if ((rd = read (fd, ev, size * 64)) < size)
perror_exit ("read()"); */
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//printf("time: %i\n type: %X\n code: %X\n value: %i\n ",
// ev->time,ev->type,ev->code,ev->value);
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if((rd = read (fd, ev, size * 64)) >= size)
for (i = 0; i < rd / sizeof(struct input_event); i++)
switch (ev[i].type)
{
case EV_ABS:
if(ev[i].code == ABS_X)
tx = ev[i].value;
else if (ev[i].code == ABS_Y)
ty = ev[i].value;
else if (ev[i].code == ABS_MISC)
{
//printf("Misc:type: %X\n code: %X\n value: %i\n ",
// ev[i].type,ev[i].code,ev[i].value);
}
break;
case EV_MSC:
if(ev[i].code == MSC_SERIAL)
curf = ev[i].value;
break;
case EV_SYN:
curf -= 1;
if(tx >= 0)
finger[curf].x = tx;
if(ty >= 0)
finger[curf].y = ty;
//printf("Synched: %i tx: %i, ty: %i\n",curf,finger[curf].x,finger[curf].y);
tx = -1;
ty = -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();