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#include <X11/Xlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <grail-touch.h>
#include <string.h>
#include <math.h>
#define XMARG 16
#define YMARG 16
#define WSCALE 0.5
#define FLUSH_MS 10
#define DEF_FRAC 0.15
struct windata {
Display *dsp;
Window root, win;
GC gc;
int screen, width, height;
unsigned long white, black;
unsigned long color[DIM_TOUCH];
int id[DIM_TOUCH];
touch_time_t last_flush;
};
static inline float max(float a, float b)
{
return b > a ? b : a;
}
static unsigned long new_color(struct windata *w)
{
return lrand48() & 0xffffff;
}
static void clear_screen(struct windata *w)
{
XSetForeground(w->dsp, w->gc, w->black);
XFillRectangle(w->dsp, w->win, w->gc, 0, 0, w->width, w->height);
}
static void output_touch(struct touch_dev *dev, struct windata *w,
const struct touch *t)
{
float x1 = dev->caps.min_x, y1 = dev->caps.min_y;
float x2 = dev->caps.max_x, y2 = dev->caps.max_y;
float dx = x2 - x1, dy = y2 - y1;
float major = 0, minor = 0, angle = 0;
if (t->pressure > 0) {
float p = DEF_FRAC / dev->caps.max_press;
major = t->pressure * p * dx;
minor = t->pressure * p * dx;
angle = 0;
}
if (t->touch_major > 0 || t->touch_minor > 0) {
major = t->touch_major;
minor = t->touch_minor;
if (major && !minor)
minor = major;
angle = touch_angle(dev, t->orientation);
}
float ac = fabs(cos(angle));
float as = fabs(sin(angle));
float mx = max(minor * ac, major * as);
float my = max(major * ac, minor * as);
float ux = t->x - 0.5 * mx;
float uy = t->y - 0.5 * my;
float vx = t->x + 0.5 * mx;
float vy = t->y + 0.5 * my;
float px = (ux - x1) / dx * w->width;
float py = (uy - y1) / dy * w->height;
float qx = (vx - x1) / dx * w->width;
float qy = (vy - y1) / dy * w->height;
if (w->id[t->slot] != t->id) {
w->id[t->slot] = t->id;
w->color[t->slot] = new_color(w);
}
XSetForeground(w->dsp, w->gc, w->color[t->slot]);
XFillArc(w->dsp, w->win, w->gc, px, py, qx - px, qy - py, 0, 360 * 64);
if (dev->frame.time - w->last_flush > FLUSH_MS) {
XFlush(w->dsp);
w->last_flush = dev->frame.time;
}
}
static void tp_event(struct touch_dev *dev,
const struct input_event *ev)
{
}
static void tp_sync(struct touch_dev *dev,
const struct input_event *syn)
{
struct windata *w = dev->priv;
struct touch_frame *frame = &dev->frame;
int i;
for (i = 0; i < frame->nactive; i++)
output_touch(dev, w, frame->active[i]);
}
static void event_loop(struct touch_dev *dev, int fd, struct windata *w)
{
XEvent ev;
dev->event = tp_event;
dev->sync = tp_sync;
dev->priv = w;
XSelectInput(w->dsp, w->win,
ButtonPressMask | ButtonReleaseMask |
ExposureMask | StructureNotifyMask);
clear_screen(w);
while (1) {
if(!touch_dev_idle(dev, fd, 100))
touch_dev_pull(dev, fd);
while (XPending(w->dsp)) {
XNextEvent(w->dsp, &ev);
}
}
}
static void run_window(struct touch_dev *dev, int fd)
{
struct windata w;
int i;
memset(&w, 0, sizeof(w));
for (i = 0; i < DIM_TOUCH; i++)
w.id[i] = -1;
w.dsp = XOpenDisplay(NULL);
if (!w.dsp)
return;
w.screen = DefaultScreen(w.dsp);
w.white = WhitePixel(w.dsp, w.screen);
w.black = BlackPixel(w.dsp, w.screen);
w.width = DisplayWidth(w.dsp, w.screen) - XMARG;
w.height = DisplayHeight(w.dsp, w.screen) - YMARG;
w.root = DefaultRootWindow(w.dsp);
w.win = XCreateSimpleWindow(w.dsp, w.root,
0, 0, w.width, w.height,
0, w.black, w.white);
XMapWindow(w.dsp, w.win);
long eventMask = StructureNotifyMask;
XSelectInput(w.dsp, w.win, eventMask);
XEvent ev;
do {
XNextEvent(w.dsp, &ev);
} while (ev.type != MapNotify);
w.gc = XCreateGC(w.dsp, w.win, 0, NULL);
event_loop(dev, fd, &w);
XDestroyWindow(w.dsp, w.win);
XCloseDisplay(w.dsp);
}
int main(int argc, char *argv[])
{
struct touch_dev dev;
int fd;
if (argc < 2) {
fprintf(stderr, "Usage: %s <device>\n", argv[0]);
return -1;
}
fd = open(argv[1], O_RDONLY | O_NONBLOCK);
if (fd < 0) {
fprintf(stderr, "error: could not open device\n");
return -1;
}
if (ioctl(fd, EVIOCGRAB, 1)) {
fprintf(stderr, "error: could not grab the device\n");
return -1;
}
if (touch_dev_open(&dev, fd)) {
fprintf(stderr, "error: could not open touch device\n");
return -1;
}
run_window(&dev, fd);
touch_dev_close(&dev, fd);
ioctl(fd, EVIOCGRAB, 0);
close(fd);
return 0;
}
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