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/*
* Copyright © 2011 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.
*/
package org.altusmetrum.micropeak;
import java.io.*;
import org.altusmetrum.altoslib_8.*;
import org.altusmetrum.altosuilib_8.*;
public class MicroStats {
double coast_height;
double coast_time;
double apogee_height;
double apogee_time;
double landed_height;
double landed_time;
double max_speed;
double max_accel;
MicroData data;
void find_landing() {
landed_height = 0;
for (MicroDataPoint point : data.points()) {
landed_height = point.height;
landed_time = point.time;
}
boolean above = false;
for (MicroDataPoint point : data.points()) {
if (point.height > landed_height + 10) {
above = true;
} else {
if (above && point.height < landed_height + 2) {
above = false;
landed_time = point.time;
}
}
}
}
void find_apogee() {
apogee_height = data.apogee_height();
double searched_apogee = 0;
apogee_time = 0;
/* This just finds the apogee time -- we've recorded the
* peak altitude separately in eeprom, and that could
* have occurred after the eeprom was full.
*/
for (MicroDataPoint point : data.points()) {
if (point.height > searched_apogee) {
searched_apogee = point.height;
apogee_time = point.time;
}
}
}
void find_coast() {
coast_height = 0;
coast_time = 0;
for (MicroDataPoint point : data.points()) {
if (point.accel < -9.8)
break;
coast_time = point.time;
coast_height = point.height;
}
}
void find_max_speed() {
max_speed = 0;
for (MicroDataPoint point : data.points()) {
if (point.time > apogee_time)
break;
if (point.speed > max_speed)
max_speed = point.speed;
}
}
void find_max_accel() {
max_accel = 0;
for (MicroDataPoint point : data.points()) {
if (point.time > apogee_time)
break;
if (point.accel > max_accel)
max_accel = point.accel;
}
}
double boost_duration() {
return coast_time;
}
double boost_height() {
return coast_height;
}
double boost_speed() {
return coast_height / coast_time;
}
double boost_accel() {
return boost_speed() / boost_duration();
}
double coast_duration() {
return apogee_time - coast_time;
}
double coast_height() {
return apogee_height - coast_height;
}
double coast_speed() {
return coast_height() / coast_duration();
}
double coast_accel() {
return coast_speed() / coast_duration();
}
double descent_duration() {
return landed_time - apogee_time;
}
double descent_height() {
return apogee_height - landed_height;
}
double descent_speed() {
return descent_height() / descent_duration();
}
public static final int state_startup = -1;
public static final int state_pad = 0;
public static final int state_boost = 1;
public static final int state_coast = 2;
public static final int state_descent = 3;
public static final int state_landed = 4;
static final String state_names[] = {
"pad",
"boost",
"coast",
"descent",
"landed"
};
public int state(double t) {
if (t >= landed_time)
return state_landed;
if (t >= apogee_time)
return state_descent;
if (t >= coast_time)
return state_coast;
if (t >= 0)
return state_boost;
return state_pad;
}
public static String state_name(int state) {
if (state < 0 || state > state_landed)
return "unknown";
return state_names[state];
}
public String state_name(double t) {
return state_name(state(t));
}
public MicroStats(MicroData data) {
this.data = data;
find_coast();
find_apogee();
find_landing();
find_max_speed();
find_max_accel();
}
public MicroStats() {
this(new MicroData());
}
}
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