shithub: map

Download patch

ref: 3cbc44156098b3e1d2a5fce0bdb25aaa991efe2b
author: sirjofri <sirjofri@sirjofri.de>
date: Fri Jan 31 12:04:04 EST 2025 

adds files


--- /dev/null
+++ b/dat.h
@@ -1,0 +1,18 @@
+typedef struct GPos GPos;
+typedef struct GBundle GBundle;
+typedef struct GProvider GProvider;
+
+struct GPos {
+	double lon;
+	double lat;
+};
+
+struct GBundle {
+	int x;
+	int y;
+	int z;
+};
+
+struct GProvider {
+	char* (*formaturl)(GBundle);
+};
--- /dev/null
+++ b/fns.h
@@ -1,0 +1,9 @@
+int lon2tilex(double lon, int z);
+int lat2tiley(double lat, int z);
+double tilex2long(int x, int z);
+double tiley2lat(int y, int z);
+
+GBundle getbundle(GPos pos, int zoom);
+GPos getlocation(void);
+
+GProvider *getprovider(void);
--- /dev/null
+++ b/gps.c
@@ -1,0 +1,43 @@
+#include <u.h>
+#include <libc.h>
+#include "dat.h"
+#include "fns.h"
+
+GPos
+getlocation()
+{
+	int fd;
+	GPos ret;
+	char buf[256];
+	char *fields[9];
+	int n, quality;
+	char *nop;
+	
+	ret.lon = 0.;
+	ret.lat = 0.;
+	
+	fd = open("/mnt/gps/position", OREAD);
+	if (fd < 0)
+		return ret;
+	
+	if ((n = read(fd, buf, 256)) <= 0) {
+		fprint(2, "read error: %r\n");
+		close(fd);
+		return ret;
+	}
+	close(fd);
+	buf[n] = 0;
+	
+	quality = atoi(buf);
+	if (!quality)
+		return ret;
+	
+	if (getfields(buf, fields, 9, 1, " ") != 9) {
+		fprint(2, "read error: invalid fields\n");
+		return ret;
+	}
+	
+	ret.lon = strtod(fields[3], &nop);
+	ret.lat = strtod(fields[4], &nop);
+	return ret;
+}
--- /dev/null
+++ b/map.c
@@ -1,0 +1,124 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <nate/nate.h>
+#include <nate/n_window.h>
+#include <nate/n_hbox.h>
+#include <nate/n_vbox.h>
+#include <nate/n_box.h>
+#include <nate/n_label.h>
+#include <nate/n_button.h>
+#include <nate/n_image.h>
+#include "dat.h"
+#include "fns.h"
+
+NWindow *mainwindow;
+NImage *nimage;
+
+Image *testimage;
+
+void
+inittestimage(void)
+{
+	Image *r, *g;
+	testimage = allocimage(display, Rect(0, 0, 100, 100), screen->chan, 1, DWhite);
+	r = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, DRed);
+	g = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, DGreen);
+	draw(testimage, Rect(0, 0, 50, 50), r, nil, ZP);
+	draw(testimage, Rect(50, 50, 100, 100), g, nil, ZP);
+	freeimage(r);
+	freeimage(g);
+}
+
+void
+eresized(int new)
+{
+	if (new && getwindow(display, Refnone) < 0)
+		sysfatal("%r");
+	
+	nateredraw();
+}
+
+int
+exitclicked(Mouse, Nelem *el, void*)
+{
+	exits(nil);
+}
+
+void
+main(int argc, char **argv)
+{
+	Event ev;
+	int z = 0;
+	char *url;
+	
+	if (initdraw(nil, nil, "map") < 0)
+		sysfatal("%r");
+	
+	einit(Emouse);
+	nateinit();
+	
+	inittestimage();
+	
+	NAssign(NWindow, &mainwindow, New_Window())
+	->MakeRoot()
+	->Slot(
+		New_VBox()
+		->Slot(
+			New_HBox()
+			->SizeToContent(1)
+			->Slot(
+				New_Button()
+				->SizeToContent(1)
+				->Border(1, display->black)
+				->Label("Exit")
+				->OnClick(exitclicked, nil)
+			)
+			->Slot(
+				New_Button()
+				->SizeToContent(1)
+				->Label("Test")
+				->Border(1, display->black)
+			)
+		)
+		->Slot(
+			New_Box()
+			->Border(1, display->black)
+			->Size(Pt(200, 300))
+			->Slot(
+				NAssign(NImage, &nimage, New_Image())
+				->Image(testimage)
+			)
+		)
+		->Slot(
+			New_Box()
+			->Border(1, display->black)
+			->Size(Pt(500, 30))
+			->Slot(
+				New_Label()
+				->Label("Status Line")
+			)
+		)
+	);
+	
+	nateredraw();
+	
+	for (;;) {
+		switch (event(&ev)) {
+		case Emouse:
+			if (ev.mouse.buttons & 4)
+				exits(nil);
+			else
+				natemouseevent(ev.mouse);
+			break;
+		}
+	}
+	
+	GPos loc = getlocation();
+	GBundle bundle = getbundle(loc, z);
+	GProvider *prov = getprovider();
+	
+	url = prov->formaturl(bundle);
+	print("%s\n", url);
+}
--- /dev/null
+++ b/mkfile
@@ -1,0 +1,11 @@
+</$objtype/mkfile
+
+TARG=map
+OFILES=\
+	map.$O\
+	osm.$O\
+	gps.$O\
+
+HFILES=fns.h
+
+</sys/src/cmd/mkone
--- /dev/null
+++ b/osm.c
@@ -1,0 +1,61 @@
+#include <u.h>
+#include <libc.h>
+#include "dat.h"
+#include "fns.h"
+
+static double
+asinh(double x)
+{
+	double s = sqrt(x*x + 1);
+	return log(x + s);
+}
+
+int
+lon2tilex(double lon, int z)
+{
+	return (int)(floor((lon + 180.0) / 360.0 * (1<<z)));
+}
+
+int
+lat2tiley(double lat, int z)
+{
+	double latrad = lat * PI/180.0;
+	return (int)(floor((1.0 - asinh(tan(latrad)) / PI) / 2.0 * (1<<z)));
+}
+
+double tilex2long(int x, int z)
+{
+	return x / (double)(1<<z) * 360.0 - 180.0;
+}
+
+double tiley2lat(int y, int z)
+{
+	double n = PI - 2.0 * PI * y / (double)(1<<z);
+	return 180.0 / PI * atan(0.5 * (exp(n) - exp(-n)));
+}
+
+GBundle
+getbundle(GPos pos, int z)
+{
+	GBundle ret;
+	ret.x = lon2tilex(pos.lon, z);
+	ret.y = lat2tiley(pos.lat, z);
+	ret.z = z;
+	return ret;
+}
+
+static char*
+defaultformaturl(GBundle b)
+{
+	return smprint("https://tile.openstreetmap.org/%d/%d/%d.png", b.z, b.x, b.y);
+}
+
+static GProvider defaultprovider = {
+	.formaturl = defaultformaturl,
+};
+
+GProvider*
+getprovider()
+{
+	return &defaultprovider;
+}