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/* GPS speedometer as a wrapper around an Athena widget Tachometer
* - Derrick J Brashear <shadow@dementia.org>
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <math.h>
#include <X11/Intrinsic.h>
#include <X11/Shell.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/Paned.h>
#include <Xm/XmStrDefs.h>
#include <Tachometer.h>
#include "config.h"
#include "xgpsspeed.icon"
#include "gps.h"
static XrmOptionDescRec options[] = {
{"-rv", "*reverseVideo", XrmoptionNoArg, "TRUE"},
{"-nc", "*needleColor", XrmoptionSepArg, NULL},
{"-needlecolor","*needleColor", XrmoptionSepArg, NULL},
{"-speedunits", "*speedunits", XrmoptionSepArg, NULL},
};
String fallback_resources[] = {NULL};
static struct gps_data_t *gpsdata;
static Widget tacho;
static double speedfactor;
static Widget toplevel;
static void update_display(struct gps_data_t *gpsdata, char *buf UNUSED)
{
TachometerSetValue(tacho, rint(gpsdata->fix.speed * speedfactor));
}
static void handle_input(XtPointer client_data UNUSED,
int *source UNUSED, XtInputId * id UNUSED)
{
gps_poll(gpsdata);
}
static char *get_resource(char *name, char *default_value)
{
XtResource xtr;
char *value = NULL;
xtr.resource_name = name;
xtr.resource_class = "AnyClass";
xtr.resource_type = XmRString;
xtr.resource_size = sizeof(String);
xtr.resource_offset = 0;
xtr.default_type = XmRImmediate;
xtr.default_addr = default_value;
XtGetApplicationResources(toplevel, &value, &xtr, 1, NULL, 0);
if (value) return value;
return default_value;
}
int main(int argc, char **argv)
{
Arg args[10];
XtAppContext app;
int option;
char *colon, *server = NULL, *port = DEFAULT_GPSD_PORT, *speedunits;
Widget base;
toplevel = XtVaAppInitialize(&app, "xgpsspeed",
options, XtNumber(options),
&argc, argv, fallback_resources, NULL);
speedfactor = KNOTS_TO_MPH; /* Software maintained in US */
speedunits = get_resource("speedunits", "mph");
if (!strcmp(speedunits, "kph"))
speedfactor = KNOTS_TO_KPH;
else if (!strcmp(speedunits, "knots"))
speedfactor = 1;
while ((option = getopt(argc, argv, "?hv")) != -1) {
switch (option) {
case 'v':
printf("xgpsspeed %s\n", VERSION);
exit(0);
case 'h': case '?': default:
fputs("usage: gps [-?] [-h] [-v] [-rv] [-nc] [-needlecolor] [-speedunits {mph,kph,knots}] [server[:port]]\n", stderr);
exit(1);
}
}
if (optind < argc) {
server = strdup(argv[optind]);
colon = strchr(server, ':');
if (colon != NULL) {
server[colon - server] = '\0';
port = colon + 1;
}
}
/**** Shell Widget ****/
XtSetArg(args[0], XtNiconPixmap,
XCreateBitmapFromData(XtDisplay(toplevel),
XtScreen(toplevel)->root, (char*)xgps_bits,
xgps_width, xgps_height));
XtSetValues(toplevel, args, 1);
/**** Form widget ****/
base = XtCreateManagedWidget("pane", panedWidgetClass, toplevel, NULL, 0);
/**** Label widget (Title) ****/
XtSetArg(args[0], XtNlabel, "GPS Speedometer");
XtCreateManagedWidget("title", labelWidgetClass, base, args, 1);
/**** Label widget ****/
if (speedfactor == KNOTS_TO_MPH)
XtSetArg(args[0], XtNlabel, "Miles per Hour");
else
XtSetArg(args[0], XtNlabel, "Km per Hour");
XtCreateManagedWidget("name", labelWidgetClass, base, args, 1);
/**** Tachometer widget ****/
tacho = XtCreateManagedWidget("meter", tachometerWidgetClass,base,NULL,0);
XtRealizeWidget(toplevel);
if (!(gpsdata = gps_open(server, DEFAULT_GPSD_PORT))) {
fputs("xgpsspeed: no gpsd running or network error\n", stderr);
exit(2);
}
XtAppAddInput(app, gpsdata->gps_fd, (XtPointer) XtInputReadMask,
handle_input, NULL);
gps_set_raw_hook(gpsdata, update_display);
gps_query(gpsdata, "w+x\n");
XtAppMainLoop(app);
gps_close(gpsdata);
return 0;
}
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