From 0732a5df62351a124db35761f8928dc359752e25 Mon Sep 17 00:00:00 2001
From: Henrik Rydberg <rydberg@bitmath.org>
Date: Fri, 27 Aug 2010 21:40:09 +0200
Subject: Simple MT contact drawing application

Uses grail-touch and mtdev.

Signed-off-by: Henrik Rydberg <rydberg@bitmath.org>
---
 .gitignore   |   2 +
 Makefile     |  35 ++++++++++++++
 src/mtview.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 183 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/mtview.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1746e32
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+bin
+obj
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9d000ae
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+SOURCES	= mtview
+TARGETS	= mtview
+
+TARG	= $(addprefix bin/,$(TARGETS))
+TOBJ	= $(addprefix obj/,$(addsuffix .o,$(SOURCES)))
+
+INCLUDE =
+LIBS	= -lX11 -lutouch-grail -lmtdev
+
+COMP	= gcc -O3 $(INCLUDE) -c $< -o $@
+LINK	= gcc $< $(LIBS) -o $@
+
+.PHONY: all man html clean mkobj
+.PRECIOUS: obj/%.o
+
+all:	$(TOBJ) $(TARG)
+
+bin/%:	obj/%.o
+	@mkdir -p $(@D)
+	$(LINK)
+
+obj/%.o: src/%.c
+	@mkdir -p $(@D)
+	$(COMP)
+
+man:
+	@rm -rf man
+	doxygen etc/doxman
+
+html:
+	@rm -rf html
+	doxygen etc/doxhtml
+
+clean:
+	rm -rf man html bin obj auto
diff --git a/src/mtview.c b/src/mtview.c
new file mode 100644
index 0000000..b8c3e37
--- /dev/null
+++ b/src/mtview.c
@@ -0,0 +1,146 @@
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <grail-touch.h>
+
+#define XMARG 64
+#define YMARG 64
+#define WSCALE 0.5
+
+struct windata {
+	Display *dsp;
+	Window root, win;
+	GC gc;
+	int screen, width, height, lastid;
+	unsigned long white, black, color[DIM_TOUCH];
+};
+
+static unsigned long new_color()
+{
+	return lrand48();
+}
+
+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;
+	int x = (t->x - x1) / (x2 - x1) * w->width;
+	int y = (t->y - y1) / (y2 - y1) * w->height;
+	int d = t->touch_major / (x2 - x1) * w->width * WSCALE;
+	if (t->id > w->lastid)
+		w->color[t->slot] = new_color();
+	XSetForeground(w->dsp, w->gc, w->color[t->slot]);
+	XFillArc(w->dsp, w->win, w->gc, x, y, d, d, 0, 360 * 64);
+}
+
+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, lastid = 0;
+	for (i = 0; i < frame->nactive; i++) {
+		const struct touch *t = frame->active[i];
+		output_touch(dev, w, t);
+		if (t->id > lastid)
+			lastid = t->id;
+	}
+	w->lastid = lastid;
+}
+
+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;
+	w->lastid = -1;
+
+	XSelectInput(w->dsp, w->win, ButtonPressMask | ButtonReleaseMask);
+	while (1) {
+		XNextEvent(w->dsp, &ev);
+		clear_screen(w);
+		XNextEvent(w->dsp, &ev);
+		while (!touch_dev_idle(dev, fd, 1000))
+			touch_dev_pull(dev, fd);
+	}
+}
+
+static void run_window(struct touch_dev *dev, int fd)
+{
+	struct windata w;
+
+	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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