Palette

Documentation

This demo shows how to color specific map areas using a palette. In the VectorMap component, 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 property. 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.

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Backend API

<template> <DxVectorMap id="vector-map" :bounds="bounds" > <DxLayer :data-source="mapsWorld" :color-groups="colorGroups" :customize="customizeLayer" palette="Violet" name="areas" color-grouping-field="population" /> <DxLegend :customize-text="customizeText" > <DxSource layer="areas" grouping="color" /> </DxLegend> </DxVectorMap> </template> <script> import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js'; import { DxVectorMap, DxLayer, DxLegend, DxSource, } from 'devextreme-vue/vector-map'; import { populations } from './data.js'; export default { components: { DxVectorMap, DxLayer, DxLegend, DxSource, }, data() { return { mapsWorld: mapsData.world, bounds: [-180, 85, 180, -60], colorGroups: [0, 0.5, 0.8, 1, 2, 3, 100], }; }, methods: { customizeLayer(elements) { elements.forEach((element) => { element.attribute('population', populations[element.attribute('name')]); }); }, customizeText(itemInfo) { let text; if (itemInfo.index === 0) { text = '< 0.5%'; } else if (itemInfo.index === 5) { text = '> 3%'; } else { text = `${itemInfo.start}% to ${itemInfo.end}%`; } return text; }, }, }; </script> <style> #vector-map { height: 440px; } </style>

import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#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/23.1.5/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.6.12/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>

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, };