Recharts component to PNG

Question

I currently have a Recharts component that I would like to export as a PNG file.

Answer 1

This function takes SVG element on input and transforms to image/png data:

export const svgToPng = (svg, width, height) => {

    return new Promise((resolve, reject) => {

        let canvas = document.createElement('canvas');
        canvas.width = width;
        canvas.height = height;
        let ctx = canvas.getContext('2d');

        // Set background to white
        ctx.fillStyle = '#ffffff';
        ctx.fillRect(0, 0, width, height);

        let xml = new XMLSerializer().serializeToString(svg);
        let dataUrl = 'data:image/svg+xml;utf8,' + encodeURIComponent(xml);
        let img = new Image(width, height);

        img.onload = () => {
            ctx.drawImage(img, 0, 0);
            let imageData = canvas.toDataURL('image/png', 1.0);
            resolve(imageData)
        }

        img.onerror = () => reject();

        img.src = dataUrl;
    });
};

And how to access the Recharts SVG element? This code snippet allows you to render any Chart outside of your current visible DOM and use it's SVG:

const exportChart = () => {

    // Output image size
    const WIDTH = 900;
    const HEIGHT = 250;

    const convertChart = async (ref) => {

        if (ref && ref.container) {
            let svg = ref.container.children[0];
            let pngData = await svgToPng(svg, WIDTH, HEIGHT);
            console.log('Do what you need with PNG', pngData);
        }
    };

    const chart = <LineChart data={...} width={WIDTH} height={HEIGHT}
        ref={ref => convertChart(ref)} />;

    // Render chart component into helper div
    const helperDiv = document.createElement('tmp');
    ReactDOM.render(chart, helperDiv);
}

Answer 2

@brammitch created a package for this (inspired by answers here):

https://github.com/brammitch/recharts-to-png

Answer 3

I was able to solve my problem by delving into the Recharts component. Recharts renders as an SVG under a wrapper so all I had to do was convert properly to save as both HTML or SVG

// Exports the graph as embedded JS or PNG
exportChart(asSVG) {

    // A Recharts component is rendered as a div that contains namely an SVG
    // which holds the chart. We can access this SVG by calling upon the first child/
    let chartSVG = ReactDOM.findDOMNode(this.currentChart).children[0];

    if (asSVG) {
        let svgURL = new XMLSerializer().serializeToString(chartSVG);
        let svgBlob = new Blob([svgURL], {type: "image/svg+xml;charset=utf-8"});
        FileSaver.saveAs(svgBlob, this.state.uuid + ".svg");
    } else {
        let svgBlob = new Blob([chartSVG.outerHTML], {type: "text/html;charset=utf-8"});
        FileSaver.saveAs(svgBlob, this.state.uuid + ".html");
    }
}

I am using FileSaver.js for the save prompt.