Pie with Custom Fill Styles

This demo uses custom patterns and gradients for PieChart slices.

Gradient

Call the registerGradient() method to obtain a gradient ID. Specify method arguments as follows:

type
This method supports two gradient types: 'linear' and 'radial'.
options
An object for gradient options.
- colors
  An array of gradient colors. Each color is an object that includes color and offset fields. The offset field specifies the starting point for each color.
- rotationAngle (linear gradients only)
  You can use this option to rotate linear gradients.

Pattern

To obtain a pattern ID, call the registerPattern() method. Specify method arguments as follows:

options
An object with pattern options.
- height
  Template height.
- width
  Template width.
- template
  A repeating SVG-based template that creates the required pattern.

Fill the PieChart

To fill all slices with the same pattern or gradient, assign a pattern ID to series.color.fillId. If you want to customize each slice individually, implement the customizePoint function (review this demo for more information).

Custom patterns and gradients are not limited to the PieChart. The following DevExtreme components support the use of patterns/gradients:

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Backend API

import React from 'react'; import PieChart, { Series, Label, Connector, Export, } from 'devextreme-react/pie-chart'; import { getStrokePattern, getSquarePattern, getLinearGradient, getRadialGradient, getPatternImage, } from './utils.js'; import { data } from './data.js'; class App extends React.Component { render() { return ( <PieChart id="pie" dataSource={data} customizePoint={customizePoint} > <Series argumentField='type' valueField='value'> <Label visible customizeText={customizeText}> <Connector visible /> </Label> </Series> <Export enabled /> </PieChart> ); } } function customizeText(info) { return info.argument; } function customizePoint(point) { const color = point.series.getPointsByArg(point.argument)[0].getColor(); let fillId; switch (point.argument) { case 'Stripes': fillId = getStrokePattern(color); break; case 'Grid': fillId = getSquarePattern(color); break; case 'Linear Gradient': fillId = getLinearGradient(color); break; case 'Radial Gradient': fillId = getRadialGradient(color); break; case 'Image': fillId = getPatternImage(color); break; default: break; } return { color: { fillId } }; } 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/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.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>

#pie { height: 440px; }

import { registerGradient, registerPattern } from 'devextreme/common/charts'; const imagePatternSize = 12; const shapePatternSize = 6; function hexToRgb(hex, opacity = 1) { const hexColorParts = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return `rgba(${parseInt(hexColorParts[1], 16)}, ${parseInt(hexColorParts[2], 16)}, ${parseInt(hexColorParts[3], 16)}, ${opacity})`; } function getGradient(type, color1, color2) { return registerGradient(type, { colors: [{ offset: '20%', color: color1, }, { offset: '90%', color: color2, }], }); } export function getLinearGradient(color) { return getGradient('linear', color, hexToRgb(color, 0.5)); } export function getRadialGradient(color) { return getGradient('radial', hexToRgb(color, 0.5), color); } export function getPatternImage(color) { return registerPattern({ width: imagePatternSize, height: imagePatternSize, template: (container) => { const rect = createRect(imagePatternSize, color); const image = document.createElementNS('http://www.w3.org/2000/svg', 'image'); image.setAttribute('x', 0); image.setAttribute('y', 0); image.setAttribute('width', imagePatternSize); image.setAttribute('height', imagePatternSize); image.setAttribute('href', '../../../../images/Charts/PieWithCustomStyles/diamond.svg'); image.setAttribute('opacity', 0.6); container.appendChild(rect); container.appendChild(image); }, }); } export function getStrokePattern(color) { return registerPattern({ width: shapePatternSize, height: shapePatternSize, template: (container) => { const halfSize = shapePatternSize / 2; const oneAndAHalfSize = shapePatternSize * 1.5; const d = `M ${halfSize} ${-halfSize} L ${-halfSize} ${halfSize} M 0 ${shapePatternSize} L ${shapePatternSize} 0 M ${oneAndAHalfSize} ${halfSize} L ${halfSize} ${oneAndAHalfSize}`; const path = document.createElementNS('http://www.w3.org/2000/svg', 'path'); path.setAttribute('stroke', color); path.setAttribute('stroke-width', 2); path.setAttribute('d', d); container.appendChild(path); }, }); } export function getSquarePattern(color) { return registerPattern({ width: shapePatternSize, height: shapePatternSize, template: (container) => { const rect = createRect(shapePatternSize, null, color, 2); container.appendChild(rect); }, }); } export function createRect(size, fill, stroke, strokeWidth) { const rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect'); rect.setAttribute('x', 0); rect.setAttribute('y', 0); rect.setAttribute('width', size); rect.setAttribute('height', size); rect.setAttribute('fill', fill); rect.setAttribute('stroke', stroke); rect.setAttribute('stroke-width', strokeWidth); return rect; }

export const data = [{ type: 'Stripes', value: 1, }, { type: 'Grid', value: 1, }, { type: 'Linear Gradient', value: 1, }, { type: 'Radial Gradient', value: 1, }, { type: 'Image', value: 1, }];