From c2f175d79c94054e0bc16e9ab3ca080be20ee2fe Mon Sep 17 00:00:00 2001
From: robertl <robertl>
Date: Tue, 28 Jun 2005 20:55:31 +0000
Subject: [PATCH] Sketch in HDOP, PDOP, VDOP, COURSE, and Speed into GPX writer
 to pave the way for Vito work.

---
 defs.h |  9 +++++++++
 gpx.c  | 22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/defs.h b/defs.h
index 8de80b592..fb8b2dabc 100644
--- a/defs.h
+++ b/defs.h
@@ -242,6 +242,15 @@ typedef struct {
 	 * nice enough to use exactly the same priority scheme.
 	 */
 	int route_priority;
+
+	/* Optional dilution of precision:  positional, horizontal, veritcal.  
+	 * 1 <= dop <= 50 
+	 */ 
+	unsigned char hdop;		
+	unsigned char vdop;		
+	unsigned char pdop;		
+	signed short course;	/* Optional: degrees true */
+	signed int speed;   	/* Optional: meters per second. */
 	
 	geocache_data gc_data;
 	xml_tag *gpx_extras;
diff --git a/gpx.c b/gpx.c
index 1f0508585..4deb6a2b3 100644
--- a/gpx.c
+++ b/gpx.c
@@ -1139,6 +1139,25 @@ write_gpx_url(const waypoint *waypointp)
 	}
 }
 
+/*
+ * Write optional accuracty information for a given (way|track|route)point
+ * to the output stream.  Done in one place since it's common for all three.
+ * Order counts.
+ */
+static void
+gpx_write_accuracy(const waypoint *waypointp)
+{
+	if (waypointp->hdop) {
+		fprintf(ofd, "  <hdop>%d</hdop>\n", waypointp->hdop);
+	}
+	if (waypointp->vdop) {
+		fprintf(ofd, "  <vdop>%d</vdop>\n", waypointp->vdop);
+	}
+	if (waypointp->pdop) {
+		fprintf(ofd, "  <pdop>%d</pdop>\n", waypointp->pdop);
+	}
+}
+
 static void
 gpx_waypt_pr(const waypoint *waypointp)
 {
@@ -1179,6 +1198,7 @@ gpx_waypt_pr(const waypoint *waypointp)
 	write_gpx_url(waypointp);
 
 	write_optional_xml_entity(ofd, "  ", "sym", waypointp->icon_descr);
+	gpx_write_accuracy(waypointp);
 
 	fprint_xml_chain( waypointp->gpx_extras, waypointp );
 	fprintf(ofd, "</wpt>\n");
@@ -1220,6 +1240,7 @@ gpx_track_disp(const waypoint *waypointp)
 	write_optional_xml_entity(ofd, "  ", "desc", waypointp->notes);
 	write_gpx_url(waypointp);
 	write_optional_xml_entity(ofd, "  ", "sym", waypointp->icon_descr);
+	gpx_write_accuracy(waypointp);
 	fprintf(ofd, "</trkpt>\n");
 }
 
@@ -1265,6 +1286,7 @@ gpx_route_disp(const waypoint *waypointp)
 	write_optional_xml_entity(ofd, "    ", "cmt", waypointp->description);
 	write_optional_xml_entity(ofd, "    ", "desc", waypointp->notes);
 	write_optional_xml_entity(ofd, "    ", "sym", waypointp->icon_descr);
+	gpx_write_accuracy(waypointp);
 	fprintf(ofd, "  </rtept>\n");
 }
 
-- 
2.30.2