Visualize data with Speedometer Graph in React Native

Data Visualization using Speedometer Graph

This is an Example to Visualize data with Speedometer Graph in React Native using react-native-speedometer. We all have seen the speedometer in the vehicle which shows the speed of the vehicle. It is always really cool to visualize continuously changing data in the speedometer as it shows the current state in a very effective way that is easy to understand. In React Native, we can make the same Speedometer-type graph to show different data or you can also use it as a loader for any progress.

For more options to render the graphs you can also see:

For this example, we will use RNSpeedometer component provided by react-native-speedometer library. This library is very easy to implement and provides lots of customization options.

How to use RNSpeedometer Component

<RNSpeedometer
  value={this.state.value}
  //value for Speedometer
  size={200}
  //Size of Speedometer
  minValue={0}
  //Min value for Speedometer
  maxValue={100}
  //Max value for Speedometer
  allowedDecimals={0}
  //Decimals value allowed or not
  labels={[
    {
      name: 'Low Risk',
      labelColor: '#ff2900',
      activeBarColor: '#ff2900',
    },
    {
      name: 'Medium Risk',
      labelColor: '#f4ab44',
      activeBarColor: '#f4ab44',
    },
    {
      name: 'High Risk',
      labelColor: '#00ff6b',
      activeBarColor: '#00ff6b',
    },
  ]}
  //Labels for the different steps of Speedometer
/>

This library provides lots of props to customize which can be seen here.

In this example, we will make a Speedometer graph by setting custom labels, label color, and active bar color. There will be an input on the screen to enter the value and this value will change the speedometer.

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react native command line interface to make our React Native App.

If you have previously installed a global react-native-cli package, please remove it as it may cause unexpected issues:

npm uninstall -g react-native-cli @react-native-community/cli

Run the following commands to create a new React Native project

npx react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

npx react-native init ProjectName --version X.XX.X

Note If the above command is failing, you may have old version of react-native or react-native-cli installed globally on your pc. Try uninstalling the cli and run the cli using npx.

This will make a project structure with an index file named App.js in your project directory.

Installation of Dependency

To use RNSpeedometer we need to install react-native-speedometer dependency.

To install this open the terminal and jump into your project using

cd ProjectName

Run the following command to install

npm install react-native-speedometer --save

This command will copy all the dependencies into your node_module directory.

Code for Speedometer Graph

Now Open App.js in any code editor and replace the code with the following code

App.js

// Visualize data with Speedometer Graph in React Native
// https://aboutreact.com/react-native-speedometer-graph/

// import React in our code
import React, {useState} from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  StyleSheet,
  TextInput,
  Text,
  View
} from 'react-native';

//Import library for Speedometer
import RNSpeedometer from 'react-native-speedometer';

const App = () => {
  const [meterValue, setMeterValue] = useState(20);

  return (
    <SafeAreaView style={{flex: 1}}>
      <View style={styles.container}>
        <RNSpeedometer
          value={meterValue}
          //value for Speedometer
          size={200}
          //Size of Speedometer
          minValue={0}
          //Min value for Speedometer
          maxValue={100}
          //Max value for Speedometer
          allowedDecimals={0}
          //Decimals value allowed or not
          labels={[
            {
              name: 'Low Risk',
              labelColor: '#ff2900',
              activeBarColor: '#ff2900',
            },
            {
              name: 'Medium Risk',
              labelColor: '#f4ab44',
              activeBarColor: '#f4ab44',
            },
            {
              name: 'High Risk',
              labelColor: '#00ff6b',
              activeBarColor: '#00ff6b',
            },
          ]}
          //Labels for the different steps of Speedometer
        />
        <View style={{marginTop: 70, padding: 20}}>
          <Text style={{fontSize: 20}}>
            Enter the value for the speedometer graph{' '}
            between 0 to 100
          </Text>
          <TextInput
            placeholder="Enter Speedometer Value"
            style={styles.textInput}
            onChangeText={(value) => setMeterValue(value)}
          />
        </View>
      </View>
    </SafeAreaView>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
  },
  textInput: {
    height: 25,
    fontSize: 16,
    marginTop: 30,
    borderBottomWidth: 0.3,
    borderBottomColor: 'black',
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

1. Start Metro Bundler

First, you will need to start Metro, the JavaScript bundler that ships with React Native. To start Metro bundler run following command:

npx react-native start

Once you start Metro Bundler it will run forever on your terminal until you close it. Let Metro Bundler run in its own terminal. Open a new terminal and run the application.

2. Start React Native Application

To run the project on an Android Virtual Device or on real debugging device:

npx react-native run-android

or on the iOS Simulator by running (macOS only)

npx react-native run-ios

Download Source Code

Output Screenshots

Output in Online Emulator

This is how you can Visualize data with Speedometer Graph in React Native using react-native-speedometer. If you have any doubts or want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂