*

Ejectable/App.tsx

@@ -1,16 +1,18 @@
 import 'react-native-gesture-handler';
 import { StatusBar } from 'expo-status-bar';
 import React, { useState, useEffect } from 'react';
-import { Text } from 'react-native';
+import { Alert,Text } from 'react-native';
 import * as Location from 'expo-location';
 import { SafeAreaProvider } from 'react-native-safe-area-context';
 
 import useCachedResources from './hooks/useCachedResources';
 import useColorScheme from './hooks/useColorScheme';
 import Navigation from './navigation';
+import { Trips } from './GT2';
+import * as fs from 'fs';
+
 
 export var debug:boolean = false;
-export var lastLoc:any;
        var expoGeoState:any;
 
 export default function App() {
@@ -31,6 +33,8 @@ export default function App() {
 
       let location = await Location.getCurrentPositionAsync({});
       setLocation(location);
+      if (!errorMsg && location)
+      Trips.deltaLoc(JSON.stringify(location));
     })();
   }, []);
 
@@ -38,7 +42,6 @@ export default function App() {
   if (errorMsg) {
     expoGeoState = errorMsg;
   } else if (location) { 
-    lastLoc      = location;
     expoGeoState = JSON.stringify(location);
   }
 

Ejectable/Coordinate.tsx

@@ -1,8 +1,8 @@
 /**  Class for handling coordinates  original by Linus Helgesson   */
  export class Coordinate {
 
-      mLatitude:number    = 0.0;
-      mLongitude:number   = 0.0;
+      public mLatitude:number    = 0.0;
+      public mLongitude:number   = 0.0;
       mResults:any        = [0, 0];
       PI_OVER_180:number  = 0.017453292519943295769236907684886;
       EARTH_RADIUS:number = 6371009;

Ejectable/GT2.tsx

@@ -1,14 +1,14 @@
 import * as React from 'react';
 import { Coordinate } from "./Coordinate";
 import { Text, View } from './components/Themed';
-import { StyleSheet } from 'react-native';
+import { Alert, StyleSheet } from 'react-native';
 import { useState, useEffect } from 'react';
 
 const styles = StyleSheet.create({
     tripText: {
      marginHorizontal: -10,
      marginVertical: 60,
-     textAlign: 'center',
+     textAlign: 'left',
      width: "80%",
      fontSize: 12,
      fontWeight: 'bold',
@@ -16,10 +16,11 @@ const styles = StyleSheet.create({
 
 var   lastLoc:any        = null; 
 const heartbeat:number   = 500; 
+const displayBeat:number = 3;  
 
 class Chronometer {
 
-    public display:string = "";
+    public display:string = "00.00.00";
            clock:number   = 0;
            intervalID:any = null;
        
@@ -38,23 +39,34 @@ class Chronometer {
 
 }
 
+  
 export class GT2 {
 
 	       loc:Coordinate        = new Coordinate(0,0);
            clock:Chronometer     = new Chronometer();
            startPoint:Coordinate = new Coordinate(0,0);
 
-           displayInterval:any   = null;
+           displayInterval:number = displayBeat * heartbeat;
     public distance:number        = 0.0;
            co2Rate:number         = 0.0;   
 	       currTime:number        = 0;
            lastTime:number        = 0;
-	public v:number              = 0;
+           z:number               = 0.0;
+	public v:number               = 0.0;
     public inProgress:boolean     = false;
     public paused:boolean         = false;
     public elapsed:number         = 0.0;
-           segments:number       = 1;
+           segments:number        = 0;
+           elevation:number       = 0.0;
 
+           nTrips:number  = 0;
+
+           parseGeoExpo(key:string, value:any) {}
+
+    public deltaLoc(lastFix:any) {
+
+
+    }
 
     public reset() {
 
@@ -75,39 +87,76 @@ export class GT2 {
         
         this.clock.stop();
         this.inProgress = false;
+        this.nTrips++;
     
     }
 
     public pause() {
     
+        if (!this.paused) {
             this.clock.stop();
             this.paused = true;
-    
-    }
-
-    public resume() {
-
+        } else {
             this.clock.start();
             this.paused = false;
         }
     
+    }
+
     public start() {
 
+        this.reset();
         this.clock.start();     
         this.inProgress = true;
     }
    
+    public getTripPanel() : string   {
 
-    public tripDisplay() {
+        if (this.inProgress)
+        return (
+        'Elapsed -    ' + this.clock.display + '\n' +
+        'Geo:             ' + 'lat: ' + this.loc.mLatitude + ' long: ' + this.loc.mLatitude + '\n' +
+        'Vector:        ' + 'distance: ' + this.distance + ' velocity: ' + this.v + '\n' + 
+        'Altitude:     ' + this.elevation + '\n');
+        else return("No trip in progress. " + this.nTrips + " trip(s) completed");
+
+    }
+
+}
+
+export class TripDisplay extends React.Component {
+    
+    constructor(props:any) {
+        super(props);
+        this.state = { seconds: 0 };
+      }
+
+      interval:any;
+
+      tick() {
+        this.setState(state => ({
+          seconds:  1
+        }));
+      }
+    
+      componentDidMount() {
+        this.interval = setInterval(() => this.tick(), Trips.displayInterval);
+      }
+    
+      componentWillUnmount() {
+        clearInterval(this.interval);
+      }
+
+    render() {
 
         return(
         <View>
            <Text style={styles.tripText}>
-             {' No trip started yet.\n'}
+             {Trips.getTripPanel() }
            </Text>
         </View> );
     }
 
 }
  
-export var ThisTrip:GT2 = new GT2();
+export var Trips:GT2 = new GT2();

Ejectable/components/ScreenInfo.tsx

@@ -13,7 +13,7 @@ export default function ScreenInfo() {
           style={styles.settingsText}
           lightColor="rgba(0,0,0,0.8)"
           darkColor="rgba(255,255,255,0.8)">
-          Switch dark km/ light mi, select fuel used, or specify CO2 g per distance                  
+          {'Switch dark: km, light: mi\nset fuel, or CO2 g per km'}                  
         </Text>  
     </View>
   );
@@ -25,7 +25,7 @@ export function ScreenInfo2() {
           style={styles.settingsText}
           lightColor="rgba(0,0,0,0.8)"
           darkColor="rgba(255,255,255,0.8)">
-          Use Pause if fuel burning portion of trip interrupted                  
+          Pause trip if fuel burning interrupted.                
         </Text>  
     </View>
   );

Ejectable/screens/TripScreen.tsx

@@ -1,8 +1,9 @@
 import * as React from 'react';
-import { Button, StyleSheet, Alert } from 'react-native';
+import { useState } from 'react';
+import { Alert, Button, StyleSheet } from 'react-native';
 import { Text, View } from '../components/Themed';
 import { ScreenInfo2 } from '../components/ScreenInfo';
-import { ThisTrip } from '../GT2';
+import { TripDisplay, Trips } from '../GT2';
 
 const styles = StyleSheet.create({
   container: {
@@ -29,27 +30,36 @@ const styles = StyleSheet.create({
 
 function startTrip() {
 
-  ThisTrip.start();
+  Trips.start();
   Alert.alert('Trip Started');
 
 }
 
 function pauseTrip() {
 
-  ThisTrip.pause();
+  if (!Trips.paused) {
       Alert.alert('Trip Paused');
+      Trips.pause();
+  }
+  else    {
+      Alert.alert('Trip Resumed');
+      Trips.pause();
+  }
 
 }
 
 function endTrip() {
 
-  ThisTrip.end();
+  Trips.end();
   Alert.alert('Trip Ended');
 
 }
 
 export default function TripScreen() {
 
+  const [sButtonText, setSButtonText] = useState("Start"); 
+  const [pButtonText, setPButtonText] = useState("Pause"); 
+  
    return (
     <View style={styles.container}>
       <Text style={styles.title}>Trip Control</Text>
@@ -57,19 +67,21 @@ export default function TripScreen() {
       <ScreenInfo2 />
       <View style={styles.controls} >
        <Button
-        title="Start"
-        onPress={() => startTrip() }
+        title={sButtonText}
+        onPress={() => {
+          if (!Trips.inProgress) {setSButtonText("End");startTrip();}
+          else {setSButtonText('Start');setPButtonText('Pause');endTrip();}}
+        }
        />
        <Button
-        title="Pause"
-        onPress={() => pauseTrip()}
-       />  
-       <Button
-        title="Stop"
-        onPress={() => endTrip() }
+        title={pButtonText}
+        onPress={() => { if (!Trips.inProgress) Alert.alert("No trip in progress!"); else {
+          if (!Trips.paused) {setPButtonText("Resume");pauseTrip();}
+          else {setPButtonText('Pause');pauseTrip();}}}
+        }
        />
       </View>
-      < ThisTrip.tripDisplay />
+      <TripDisplay></TripDisplay>
     </View>
   );