jqwidgets-scripts-custom/demos/React/app/chart/customdrawing/app.js

jQWidgets is an advanced jQuery, Angular 7, Vue, React, ASP .NET MVC, Custom Elements and HTML5 UI framework.

import React from 'react';
import ReactDOM from 'react-dom';

import JqxChart from '../../../jqwidgets-react/react_jqxchart.js';

class App extends React.Component {
    transformPath(path, wScale, hScale, xOffset, yOffset) {
        let output = '';
        for (let i = 0; i < path.length; i++) {
            if (path[i] == 'C' || path[i] == 'M' || path[i] == 'L') {
                output += path[i];
                i++;

                let j = i;
                while (j + 1 < path.length && !(path[j + 1] == 'C' || path[j + 1] == 'M' || path[j + 1] == 'L' || path[j + 1] == 'z'))
                    j++;
                let value = path.substring(i, j);
                let pointsString = value.split(' ');
                for (let s = 0; s < pointsString.length; s++) {
                    if (pointsString[s].length == 0)
                        continue;
                    let pointString = pointsString[s].split(',');
                    let point = { x: pointString[0], y: pointString[1] };
                    point.x = point.x * wScale + xOffset;
                    point.y = point.y * hScale + yOffset;
                    output += ' ' + point.x + ',' + point.y + ' ';
                }
                i = j - 1;
            }
            else {
                output += path[i];
            }
        }
        return output;
    }
    render() {
        let source =
            {
                datatype: 'json',
                datafields: [
                    { name: 'id' },
                    { name: 'path' },
                    { name: 'europe' },
                    { name: 'eu' }
                ],
                /* EU map definitions in JSON derived from  http://commons.wikimedia.org/wiki/File:116_000_map_of_Europe.svg */
                url: '../sampledata/europe.txt'
            };
        let dataAdapter = new $.jqx.dataAdapter(source, { async: false, autoBind: true, loadError: (xhr, status, error) => { alert('Error loading "' + source.url + '" : ' + error); } });

        let padding = { left: 10, top: 5, right: 10, bottom: 5 };

        let titlePadding = { left: 90, top: 0, right: 0, bottom: 10 };

        let drawBefore = (renderer, rect) => {
            renderer.rect(rect.x, rect.y, rect.width, rect.height, { fill: 'lightblue' });
        };

        let draw = (renderer, rect) => {
            let records = dataAdapter.records;
            let wScale = rect.width / 13000
            let hScale = (rect.height) / 8500;
            
            for (let i = 0; i < records.length; i++) {
                let path = this.transformPath(records[i].path, wScale, hScale, 62, 22);
                let pathElement = renderer.path(path, { stroke: 'black' });
                if (records[i].eu == 'true') {
                    renderer.attr(pathElement, { fill: 'blue' });
                }
                else
                    renderer.attr(pathElement, { fill: '#DEDEDE' });
            } 
        };
        return (
            <JqxChart style={{ width: 850, height: 500 }}
                title={'Map of the European Union'} description={''}
                padding={padding} titlePadding={titlePadding} source={dataAdapter}
                drawBefore={drawBefore} draw={draw}
            />
        )
    }
}

ReactDOM.render(<App />, document.getElementById('app'));