-
Notifications
You must be signed in to change notification settings - Fork 0
/
compass.js
133 lines (115 loc) · 3.35 KB
/
compass.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
import React, { Component } from 'react';
import { Text, View, StyleSheet, Image, Animated, Easing, Dimensions} from 'react-native';
import { Location, Permissions } from 'expo';
export default class Compass extends Component {
constructor() {
super();
this.spinValue = new Animated.Value(0);
this.state = {
location: null,
errorMessage: null,
heading: null,
truenoth: null
};
}
componentWillMount() {
this._getLocationAsync();
}
componentWillUpdate() {
this.spin()
}
_getLocationAsync = async () => {
// Checking device location permissions
let { status } = await Permissions.askAsync(Permissions.LOCATION);
if (status !== 'granted') {
this.setState({
errorMessage: 'Permission to access location was denied',
});
}
else
{
Expo.Location.watchHeadingAsync((obj) => {
let heading = obj.magHeading;
this.setState({heading: heading})
})
}
};
spin() {
let start = JSON.stringify(this.spinValue);
let heading = Math.round(this.state.heading);
let rot = +start;
let rotM = rot % 360;
if(rotM < 180 && (heading > (rotM + 180)))
rot -= 360;
if(rotM >= 180 && (heading <= (rotM - 180)))
rot += 360
rot += (heading - rotM)
Animated.timing(
this.spinValue,
{
toValue: rot,
duration: 300,
easing: Easing.easeInOut
}
).start()
}
render() {
let LoadingText = 'Loading...';
let display = LoadingText;
if (this.state.errorMessage)
display = this.state.errorMessage;
const spin = this.spinValue.interpolate({
inputRange: [0,360],
outputRange: ['-0deg', '-360deg']
})
display = Math.round(JSON.stringify(this.spinValue))
if(display < 0)
display += 360
if(display > 360)
display -= 360
return (
<View style={styles.container}>
<Text style={styles.text}>{display+'°'}</Text>
<View style={styles.imageContainer} >
<Animated.Image resizeMode='contain' source={require('./assets/icon.png')}
style={{
width: deviceWidth - 10, height: deviceHeight/2 - 10,
left: deviceWidth /2 - (deviceWidth - 10)/2, top: deviceHeight /2 - (deviceHeight/2 - 10)/2,
transform: [{rotate: spin}],
}} />
</View>
<View style={styles.arrowContainer} >
<Image resizeMode='contain' source={require('./assets/icon.png')} style={styles.arrow} />
</View>
</View>
);
}
}
// Device dimensions so we can properly center the images set to 'position: absolute'
const deviceWidth = Dimensions.get('window').width
const deviceHeight = Dimensions.get('window').height
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
},
text: {
color: '#263544',
fontSize: 80,
transform: ([{translateY: -(deviceHeight/2 - (deviceHeight/2 - 10)/2) - 50 }])
},
imageContainer: {
...StyleSheet.absoluteFillObject,
},
arrowContainer: {
...StyleSheet.absoluteFillObject,
},
arrow: {
width: deviceWidth/7,
height: deviceWidth/7,
left: deviceWidth /2 - (deviceWidth/7)/2,
top: deviceHeight /2 - (deviceWidth/7)/2,
opacity: 0.9
}
});