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how about combining native Highcharts export functionality with html2canvas?

First, you export Highcharts to a file. I'm guessing that it's enough to know the URL you have to call to get an image.

Second, you use your standard html2canvas magic to produce a document without a chart. (You may need to specify width and height of the div with chart so it doesn't collapse in exported file).

Finally, you use gd or imagemagick to paste one onto another and serve back to client.

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It's to simple you can use this code for capture the screenshot of particular area you have to define the div id in html2canvas. I'm using here 2 div-:

div id="car"
div id ="chartContainer"
if you want to capture only cars then use car i'm capture here car only you can change chartContainer for capture the graph html2canvas($('#car') copy and paste this code

<html>
    <head>


<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>
<script src="https://code.jquery.com/jquery-1.12.4.min.js" integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.5/jspdf.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css" integrity="sha384-hWVjflwFxL6sNzntih27bfxkr27PmbbK/iSvJ+a4+0owXq79v+lsFkW54bOGbiDQ" crossorigin="anonymous">
<script>
    window.onload = function () {
    
    var chart = new CanvasJS.Chart("chartContainer", {
        animationEnabled: true,
        theme: "light2",
        title:{
            text: "Simple Line Chart"
        },
        axisY:{
            includeZero: false
        },
        data: [{        
            type: "line",       
            dataPoints: [
                { y: 450 },
                { y: 414},
                { y: 520, indexLabel: "highest",markerColor: "red", markerType: "triangle" },
                { y: 460 },
                { y: 450 },
                { y: 500 },
                { y: 480 },
                { y: 480 },
                { y: 410 , indexLabel: "lowest",markerColor: "DarkSlateGrey", markerType: "cross" },
                { y: 500 },
                { y: 480 },
                { y: 510 }

            ]
        }]
    });
    chart.render();
    
    }
</script>
</head>

<body bgcolor="black">
<div id="wholebody">  
<a href="javascript:genScreenshotgraph()"><button style="background:aqua; cursor:pointer">Get Screenshot of Cars onl </button> </a>

<div id="car" align="center">
    <i class="fa fa-car" style="font-size:70px;color:red;"></i>
    <i class="fa fa-car" style="font-size:60px;color:red;"></i>
    <i class="fa fa-car" style="font-size:50px;color:red;"></i>
    <i class="fa fa-car" style="font-size:20px;color:red;"></i>
    <i class="fa fa-car" style="font-size:50px;color:red;"></i>
    <i class="fa fa-car" style="font-size:60px;color:red;"></i>
    <i class="fa fa-car" style="font-size:70px;color:red;"></i>
</div>
<br>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>

<div id="box1">
</div>
</div>>
</body>

<script>

function genScreenshotgraph() 
{
    html2canvas($('#car'), {
        
      onrendered: function(canvas) {

        var imgData = canvas.toDataURL("image/jpeg");
        var pdf = new jsPDF();
        pdf.addImage(imgData, 'JPEG', 0, 0, -180, -180);
        pdf.save("download.pdf");
        
      
      
      }
     });

}

</script>

</html>


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