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w-hc2png

v1.0.29

Published

A package for Highcharts to png by chromium.

Downloads

276

Readme

w-hc2png

A package for Highcharts to png by chromium.

language npm version license npm download npm download jsdelivr download

Documentation

To view documentation or get support, visit docs.

Installation

Using npm(ES6 module):

Note: w-hc2png is mainly dependent on puppeteer, json5 and @hapi/hapi.

npm i w-hc2png

Example for function:

Link: [dev source code]

import WHc2png from './src/WHc2png.mjs'

function genPlotHtml(fp, b64) {
    let h = `
<html>
    <head></head>
    <body>
        <img style="border:1px dashed #ddd;" src="data:image/png;base64, {b64}">
    </body>
</html>
    `
    h = h.replace('{b64}', b64)
    fs.writeFileSync(fp, h, 'utf8')
}

async function testa() {

    let width = 500
    let height = 400
    let scale = 3
    let opt = {

        title: {
            text: 'Logarithmic axis demo'
        },

        xAxis: {
            tickInterval: 1,
            type: 'logarithmic',
            accessibility: {
                rangeDescription: 'Range: 1 to 10'
            }
        },

        yAxis: {
            type: 'logarithmic',
            minorTickInterval: 0.1,
            accessibility: {
                rangeDescription: 'Range: 0.1 to 1000'
            }
        },

        tooltip: {
            headerFormat: '<b>{series.name}</b><br />',
            pointFormat: 'x = {point.x}, y = {point.y}'
        },

        series: [{
            data: [1, 2, 4, 8, 16, 32, 64, 128, 256, 512],
            pointStart: 1
        }]

    }

    let b64 = await WHc2png(width, height, scale, opt)
    // console.log('b64', b64)

    fs.writeFileSync('./test-scla.b64', b64)
    genPlotHtml('./test-scla.html', b64)

    console.log('finish')
}
testa()
    .catch((err) => {
        console.log(err)
    })

async function testb() {

    let width = 500
    let height = 400
    let scale = 3
    let cOpt = `
    let ds = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
    for (let i = 0; i < ds.length; i++) {
        ds[i] = Math.sin(ds[i]/360*Math.PI)
    }
    let opt = {

        title: {
            text: 'Logarithmic axis demo'
        },

        xAxis: {
            tickInterval: 1,
            type: 'logarithmic',
            accessibility: {
                rangeDescription: 'Range: 1 to 10'
            }
        },

        yAxis: {
            type: 'logarithmic',
            minorTickInterval: 0.1,
            accessibility: {
                rangeDescription: 'Range: 0.1 to 1000'
            }
        },

        tooltip: {
            headerFormat: '<b>{series.name}</b><br />',
            pointFormat: 'x = {point.x}, y = {point.y}'
        },

        series: [{
            data: ds,
            pointStart: 1
        }]

    }
    `
    let whOpt = {}

    let b64 = await WHc2png(width, height, scale, cOpt, whOpt)
    // console.log('b64', b64)

    fs.writeFileSync('./test-sclb.b64', b64)
    genPlotHtml('./test-sclb.html', b64)

    console.log('finish')
}
testb()
    .catch((err) => {
        console.log(err)
    })

Example for Server:

Link: [dev source code]

import WHc2pngServer from 'w-hc2png/src/WHc2pngServer.mjs'

let opt = {
    port: 9020,
    apiName: 'api',
}
WHc2pngServer(opt)

------------------------

[POST] http://localhost:9020/api

{
    width: 500,
    height: 400,
    scale: 3,
    opt: {
    
        title: {
            text: 'Logarithmic axis demo'
        },
    
        xAxis: {
            tickInterval: 1,
            type: 'logarithmic',
            accessibility: {
                rangeDescription: 'Range: 1 to 10'
            }
        },
    
        yAxis: {
            type: 'logarithmic',
            minorTickInterval: 0.1,
            accessibility: {
                rangeDescription: 'Range: 0.1 to 1000'
            }
        },
    
        tooltip: {
            headerFormat: '<b>{series.name}</b><br />',
            pointFormat: 'x = {point.x}, y = {point.y}'
        },
    
        series: [{
            data: [1, 2, 4, 8, 16, 32, 64, 128, 256, 512],
            pointStart: 1
        }]
    
    }

}