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ListScreen.js
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ListScreen.js
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import React,{useState} from 'react';
import {useEffect} from 'react';
import {
ScrollView,
StyleSheet,
Text,
Alert,
View,
List,
ListItem,
} from 'react-native';
// the List component, self explanatory
export default function ListScreen(props) {
//get distance from you to a point
const distance=(lat1, lon1, lat2, lon2, unit)=>{
let radlat1 = Math.PI * lat1/180;
let radlat2 = Math.PI * lat2/180;
let theta = lon1-lon2;
let radtheta = Math.PI * theta/180;
let dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
dist = Math.acos(dist)
dist = dist * 180/Math.PI
dist = dist * 60 * 1.1515
if (unit=="K") { dist = dist * 1.609344 }
if (unit=="M") { dist = dist * 0.8684 }
return (Math.round(dist * 100) / 100).toString();
}
// simultaneous sort of 2 arrays distances and addresses
const sorter=()=>{
let dist=[];
props.points['points'].map((item,ind)=>{
dist.push({'dist':distance(
props.screenProps.latitude,
props.screenProps.longitude,
item['latitude'],
item['longitude'],
'K'),
'addr':item['address']
})
})
if(props.screenProps=='false')
{
return dist.sort((a, b)=> {return a.addr>b.addr?1:-1})
}
return dist.sort((a, b)=> {return a.dist-b.dist});
}
const listitems = sorter().map((item,ind)=>{
return (
<View style={styles.itemline} key={400+ind}>
<View style={styles.littleBox} key={500+ind}></View>
<Text style={styles.item} key={200+ind} >{item['addr']}</Text>
<Text style={styles.dist} key={300+ind}>
{item['dist'] !='NaN'?`Distance (km): ${item['dist']} `:'Distance (km): -'}
</Text>
</View>
)
});
return (
<ScrollView style={styles.container}>
{listitems}
</ScrollView>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
paddingTop: 22
},
item: {
marginLeft:10,
padding: 2,
fontSize: 16,
height: 44,
fontWeight:'400'
},
dist:{
marginLeft:10,
padding: 2,
fontSize: 16,
height: 44,
fontWeight:'400',
color:'#006064'
},
itemline:{
backgroundColor:'#FAFAFA',
marginLeft:5,
marginRight:7,
marginBottom:13,
shadowColor: '#202020',
shadowOffset: {width: 0, height: 0},
shadowRadius: 5,
elevation:4,
},
littleBox:{
height:88,
width:5,
backgroundColor:'#0097A7',
position: 'absolute',
left:0,
top:0,
}
});