Palette
Documentation
This demo shows how to color specific map areas using a palette. In the VectorMap widget, a palette defines a range of colors that are used to paint areas. This range is divided into segments using the value assigned to the colorGroups option. Each segment contributes a color into an array of colors.
The map in this demo represents the top 40 countries by population. Map areas are colored according to the percentage of population.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
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import React from 'react';
import VectorMap, {
Layer,
Legend,
Source
} from 'devextreme-react/vector-map';
import * as mapsData from 'devextreme/dist/js/vectormap-data/world.js';
import { populations } from './data.js';
const colorGroups = [0, 0.5, 0.8, 1, 2, 3, 100];
const bounds = [-180, 85, 180, -60];
function App() {
return (
<VectorMap
id="vector-map" bounds={bounds}>
<Layer
dataSource={mapsData.world}
palette="Violet"
name="areas"
colorGroupingField="population"
colorGroups={colorGroups}
customize={customizeLayer}
>
</Layer>
<Legend
customizeText={customizeText}>
<Source layer="areas" grouping="color"></Source>
</Legend>
</VectorMap>
);
}
function customizeLayer(elements) {
elements.forEach((element) => {
element.attribute('population', populations[element.attribute('name')]);
});
}
function customizeText(arg) {
let text;
if (arg.index === 0) {
text = '< 0.5%';
} else if (arg.index === 5) {
text = '> 3%';
} else {
text = `${arg.start}% to ${arg.end}%`;
}
return text;
}
export default App;
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(
<App />,
document.getElementById('app')
);
<!DOCTYPE html>
<html>
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import('./index.js');
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
#vector-map {
height: 440px;
}
export const populations = {
'China': 19,
'India': 17.4,
'United States': 4.44,
'Indonesia': 3.45,
'Brazil': 2.83,
'Pakistan': 2.62,
'Nigeria': 2.42,
'Bangladesh': 2.18,
'Russia': 2.04,
'Japan': 1.77,
'Mexico': 1.67,
'Philippines': 1.39,
'Vietnam': 1.25,
'Ethiopia': 1.23,
'Egypt': 1.21,
'Germany': 1.13,
'Iran': 1.08,
'Turkey': 1.07,
'Congo (Kinshasa)': 0.94,
'France': 0.92,
'Thailand': 0.9,
'United Kingdom': 0.89,
'Italy': 0.85,
'Burma': 0.84,
'South Africa': 0.74,
'S. Korea': 0.7,
'Colombia': 0.66,
'Spain': 0.65,
'Tanzania': 0.63,
'Kenya': 0.62,
'Ukraine': 0.6,
'Argentina': 0.59,
'Algeria': 0.54,
'Poland': 0.54,
'Sudan': 0.52,
'Canada': 0.49,
'Uganda': 0.49,
'Iraq': 0.47,
'Morocco': 0.46,
'Uzbekistan': 0.43
};
System.config({
transpiler: 'plugin-babel',
meta: {
'devextreme/dist/js/vectormap-data/*': {
esModule: true
}
},
paths: {
'npm:': 'https://unpkg.com/'
},
defaultExtension: 'js',
map: {
'react': 'npm:react@16/umd/react.development.js',
'react-dom': 'npm:react-dom@16/umd/react-dom.development.js',
'prop-types': 'npm:prop-types/prop-types.js',
'devextreme': 'npm:devextreme@19.2',
'devextreme/dist/js/vectormap-data': 'npm:devextreme@19.2/dist/js/vectormap-data',
'devextreme-react': 'npm:devextreme-react@19.2',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'devexpress-gantt': 'npm:devexpress-gantt',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js',
'systemjs-babel-build':
'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js'
},
packages: {
'devextreme': {
defaultExtension: 'js'
},
'devextreme-react': {
main: 'index.js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});