Spline Area Charts, also referred as Curved / Smoothed Area Chart, are similar to Area Charts except that the envelope of area is a smooth curve. Given example shows Spline Area Chart along with source code that you can try running locally.
<?php
$dataPoints = array(
array("x" => 1483381800000 , "y" => 650),
array("x" => 1483468200000 , "y" => 700),
array("x" => 1483554600000 , "y" => 710),
array("x" => 1483641000000 , "y" => 658),
array("x" => 1483727400000 , "y" => 734),
array("x" => 1483813800000 , "y" => 963),
array("x" => 1483900200000 , "y" => 847),
array("x" => 1483986600000 , "y" => 853),
array("x" => 1484073000000 , "y" => 869),
array("x" => 1484159400000 , "y" => 943),
array("x" => 1484245800000 , "y" => 970),
array("x" => 1484332200000 , "y" => 869),
array("x" => 1484418600000 , "y" => 890),
array("x" => 1484505000000 , "y" => 930)
);
?>
<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
animationEnabled: true,
theme: "light2",
title:{
text: "Site Traffic"
},
axisX: {
valueFormatString: "DD MMM"
},
axisY: {
title: "Total Number of Visits",
maximum: 1200
},
data: [{
type: "splineArea",
color: "#6599FF",
xValueType: "dateTime",
xValueFormatString: "DD MMM",
yValueFormatString: "#,##0 Visits",
dataPoints: <?php echo json_encode($dataPoints); ?>
}]
});
chart.render();
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
</body>
</html>
You can change the look and feel of the chart using the color and fillOpacity properties. Some of the other commonly used customization options include markerColor, markerBorderColor, etc.