X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=aoview%2Faoview_state.c;fp=aoview%2Faoview_state.c;h=efd49042e840b559b9e99dd7082340a044c02b5e;hb=09771c644de54ae354e8f98af7ba74289b3c0fcc;hp=0000000000000000000000000000000000000000;hpb=37250b00f6286aee4b3b28604f5d463db3079a89;p=fw%2Faltos

diff --git a/aoview/aoview_state.c b/aoview/aoview_state.c
new file mode 100644
index 00000000..efd49042
--- /dev/null
+++ b/aoview/aoview_state.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright © 2009 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "aoview.h"
+#include <math.h>
+
+static int	pad_pres;
+static int	pad_accel;
+
+static int	pad_pres_total;
+static int	pad_accel_total;
+static double	pad_lat_total;
+static double	pad_lon_total;
+static int	pad_alt_total;
+static int	npad;
+static int	prev_tick;
+static double	prev_accel;
+static double	velocity;
+static double	pad_lat;
+static double	pad_lon;
+static double	pad_alt;
+
+#define NUM_PAD_SAMPLES	50
+
+
+
+static void
+aoview_great_circle (double start_lat, double start_lon,
+		     double end_lat, double end_lon,
+		     double *dist, double *bearing)
+{
+	double rad = M_PI / 180;
+	double earth_radius = 6371.2;
+	double a = (90 - start_lat) * rad;
+	double b = (90 - end_lat) * rad;
+	double phi = (end_lon - start_lon) * rad;
+	double cosr = cos(a) * cos(b) + sin(a) * sin(b) * cos(phi);
+	double r = acos(cosr);
+	double rdist = earth_radius * r;
+	double sinth = sin(phi) * sin(b) / sin(r);
+	double th = asin(sinth) / rad;
+	*dist = rdist;
+	*bearing = th;
+}
+
+void
+aoview_state_notify(struct aostate *state)
+{
+	int	altitude;
+	double	accel;
+	double	velocity_change;
+	int	ticks;
+	double	dist;
+	double	bearing;
+
+	if (!strcmp(state->state, "pad")) {
+		if (npad < NUM_PAD_SAMPLES) {
+			pad_accel_total += state->accel;
+			pad_pres_total += state->pres;
+			pad_lat_total += state->lat;
+			pad_lon_total += state->lon;
+			pad_alt_total += state->alt;
+			npad++;
+			velocity = 0;
+		}
+		if (npad <= NUM_PAD_SAMPLES) {
+			pad_pres = pad_pres_total / npad;
+			pad_accel = pad_accel_total / npad;
+			pad_lat = pad_lat_total / npad;
+			pad_lon = pad_lon_total / npad;
+			pad_alt = pad_alt_total / npad;
+		}
+	}
+	altitude = aoview_pres_to_altitude(state->pres) - aoview_pres_to_altitude(pad_pres);
+	accel = (pad_accel - state->accel) / 264.8 *  9.80665;
+	velocity_change = (accel + prev_accel) / 2.0;
+	ticks = state->tick - prev_tick;
+	velocity -= velocity_change * (ticks / 100.0);
+
+	prev_accel = accel;
+	prev_tick = state->tick;
+	printf ("Pad altitude: %dm\n", aoview_pres_to_altitude(pad_pres));
+	printf ("AGL: %dm\n", altitude);
+	printf ("Acceleration: %gm/s²\n", accel);
+	printf ("Velocity: %gm/s\n", velocity);
+	printf ("Lat: %g\n", state->lat);
+	printf ("Lon: %g\n", state->lon);
+	printf ("GPS alt: %d\n", state->alt);
+	aoview_great_circle(pad_lat, pad_lon, state->lat, state->lon,
+			    &dist, &bearing);
+	printf ("Course: %gkm %g°\n", dist, bearing);
+}
+
+void
+aoview_state_init(GladeXML *xml)
+{
+}