Introduction of React Native Linear Gradient
Linear Gradient is a way for creating an image which has a transition progressing between different colours. Linear Gradient can be used to fill lines, rectangles, texts, circles, images etc. Linear Gradient is not supported by React Native directly but a library named as react native linear gradient helps us in creating a linear gradient for our apps. React native has different components and ways to implement a linear gradient. Linear gradient is easy to make in react native without the need of extra dependencies. In this article, we will go through some examples to understand the application Linear Gradient in React Native.
Syntax of React Native Linear Gradient
Syntax of using React Native Linear Gradient:
1. Basic Linear Gradient
<LinearGradient
colors={[' #ed83f2', ' #dafc74', ' #ed4a7b']}
style={styles.linearGradient}>
<Text style={styles.buttonText}>
Basic Linear Gradient Syntax
</Text>
</LinearGradient>
2. Horizontal Linear Gradient
<LinearGradient
start={{x: 1, y: 0}}
end={{x: 0, y: 0}}
colors={['#ed83f2', '#dafc74', '#ed4a7b'']}
style={styles.linearGradient}>
<Text style={styles.buttonText}>
Horizontal Linear Gradient Syntax
</Text>
</LinearGradient>
3. Location Linear Gradient
<LinearGradient
start={{x: 0.0, y: 0.35}}
end={{x: 0.6, y: 2.0}}
locations={[0,0.5,0.6]}
colors={['#ed83f2', '#dafc74', '#ed4a7b'']}
style={styles.linearGradient}>
<Text style={styles.buttonText}>
Location Linear Gradient Syntax
</Text>
</LinearGradient>
Working of React Native Linear Gradient
Linear Gradient can be created in our react native apps using the props described below:
- colors: This defines an array of multiple colours which displays the gradient. Example: [‘Yellow’, ‘cyan’] displays the gradient from yellow to cyan.
- start: This object defines the starting coordinates of the gradient in the following way : {x:number,y:number}. The coordinates sets the position where the gradient will start. It is written as a fraction of the complete gradient’s size and starts from the top left corner. Example:{x:0.2,y:0.2} defines the gradient to start at 20% from the top and 20% from left corner.
- end: It works just like start, the only difference is that it defines the gradient’s end.
- locations: This defines the location where each gradient color will change or stop. It maps to the colors synced with the colors prop. Example: [0.2,0.5,1] defines the first color to start from 0% to 20% then the second color starts from 20% and ends at 50% and now the last color will take the rest of the gradient left.These props will be enough to start with Linear Gradient.
Examples of React Native Linear Gradient
Following are the examples are given below:
Example #1
React Native Linear Gradient Example with Range Slider & Percentage window:
In the example below, one change the colour using the range slider which moves in the range from 0 to 360 or also by editing the range in the percentage box below the range slider. The linear horizontal gradients are already been set up within the code. One changes the gradients by editing the below code according to one’s need.
The files used to implement the code below are:
1. index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#050505">
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<title>React Native Linear Gradient App</title>
</head>
<body>
<noscript>
To run application, enable JavaScript.
</noscript>
<div id="root"></div>
</body>
</html>
2. index.js
import React from "react";
import ReactDOM from "react-dom";
import styled
, { createGlobalStyle } from "styled-components";
const Reset = createGlobalStyle`
* {
margin: 0;
padding: 0;
}
`;
constFullScreen = styled.div`
height: 101vh;
width: 101vw;
`;
const Gradient = styled.div`
background: linear-gradient(
30deg,
hsl(${props =>props.hue}, 120%, 50%),
hsl(${props =>props.hue - 305}, 120%, 0%)
);
height: 105%;
width: 99%;
`;
constCentered = styled.div`
position: absolute;
top: 45%;
left: 45%;
transform: translateX(-45%) translateY(-45%);
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
`;
constRangeInput = styled.input.attrs({
type: "range"
})``;
const RangeInput1 = styled.input.attrs({
type: "percentage"
})``;
const Text = styled.h1`
color: #fcfcfc;
font-family: times;
margin-bottom: 18px;
`;
function App() {
const [hue, setHue] = React.useState(340);
return (
<>
<Reset />
<FullScreen>
<Centered>
<Text>{'\u2740'} React Native Linear Gradient {'\u2740'}</Text>
<RangeInput
value={hue}
onChange={evt =>setHue(evt.target.value)}
min="0"
max="360"
/>
<RangeInput1
value={hue}
onChange={evt =>setHue(evt.target.value)}
min="0"
max="360"
/>
</Centered>
<Gradient hue={hue} />
</FullScreen>
</>
);
}
constrootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
Output:
Example #2
React Native Linear Gradient Example with an Image
In the example below, we have used an image and dummy button. The linear gradients along x-axis (i.e. horizontally) are set up using 3 different colours. One change the gradients by editing the below code according to one’s need.
The files used to implement the code below are:
1. index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#050505">
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<title>React Native Application</title>
<style>
html,
body {
height: 100%;
}
body {
overflow: hidden;
}
#root {
display: flex;
height: 100%;
}
</style>
</head>
<body>
<noscript>
To run this application, enable JavaScript.
</noscript>
<div id="root"></div>
</body>
</html>
2. App.js
import React
, { Component } from "react";
import { Button
, StyleSheet
, View
, Text } from "react-native";
import FullWidthImage from "react-native-fullwidth-image";
import LinearGradient from "react-native-web-linear-gradient";
import "typeface-roboto";
constlogoUri =
"https://images.pexels.com/photos/3861964/pexels-photo-3861964.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500";
class App extends Component {
render() {
return (
<View style={styles.heroContainer}>
<LinearGradient
colors={["#c4ed5c", "#bb4fdb", "#80161e"]}
style={styles.linearGradient}
/>
<FullWidthImage
accessibilityLabel="Rahul Dubey"
source={{ uri: logoUri }}
/>
<View style={styles.heroHeaderContainer}>
<View style={styles.heroHeaderTextContainer}>
<Text style={styles.heroHeaderText}>React Native.</Text>
<Text style={styles.heroHeaderText}>Linear Gradient.</Text>
</View>
<Button title="Coding is Love" />
</View>
</View>
);
}
}
const styles = StyleSheet.create({
heroContainer: {
position: "relative"
},
linearGradient: {
position: "absolute",
zIndex: 10,
left: 0,
top: 0,
right: 0,
bottom: 0,
opacity: 0.55
},
heroHeaderContainer: {
left: 0,
top: 0,
right: 0,
bottom: "30%",
position: "absolute",
alignItems: "start",
justifyContent: "center",
zIndex: 11,
marginLeft: 45
},
heroHeaderText: {
fontSize: 49,
color: "#fcfcfc",
textTransform: "uppercase"
},
heroHeaderTextContainer: {
marginBottom: 28
}
});
export default App;
3. index.js
import { AppRegistry } from "react-native";
import App from "./App";
AppRegistry.registerComponent("App", () => App);
AppRegistry.runApplication("App", {
rootTag: document.getElementById("root")
});
Output:
Conclusion
On the basis of the above article, we understood the concept of Linear Gradient and how it is used in React Native. We went through different examples to understand its application in React Native and how it can be used according to our requirements. We hope this article would have made the concept of Linear Gradient easy to understand.
Recommend ed Articles
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