Logarithmic Scale
Documentation
In this demo, a logarithmic axis is used to select a range within a set of rapidly-growing values.
window.onload = function() {
var dataSource = [],
max = 100;
for (var i = 0; i < max; i++) {
dataSource.push({ arg: Math.pow(10, i * 0.1), val: Math.log(i + 1) / Math.log(0.5) + (Math.random() - 0.5) * (100 / (i + 1)) + 10 });
}
var viewModel = {
chartOptions: {
dataSource: dataSource,
argumentAxis: {
valueMarginsEnabled: false,
type: "logarithmic",
label: { format: "exponential" },
grid: {
visible: true
},
minorGrid: {
visible: true
},
minorTickCount: 10
},
valueAxis: {
placeholderSize: 50
},
legend: {
visible: false
},
series: {}
},
rangeSelectorOptions: {
size: {
height: 120
},
dataSource: dataSource,
chart: {
series: {}
},
scale: {
type: "logarithmic",
label: { format: "exponential" },
minRange: 1,
minorTickCount: 10
},
sliderMarker: {
format: "exponential"
},
behavior: {
callValueChanged: "onMoving",
snapToTicks: false
},
onValueChanged: function (e) {
$("#zoomed-chart").dxChart("instance").zoomArgument(e.value[0], e.value[1]);
}
}
};
ko.applyBindings(viewModel, $("#range-selector-demo").get(0));
};
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery-3.1.0.min.js"%3E%3C/script%3E'))</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/18.1.3/css/dx.spa.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/18.1.3/css/dx.common.css" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/18.1.3/css/dx.light.css" />
<script src="https://cdn3.devexpress.com/jslib/18.1.3/js/dx.all.js"></script>
<link rel="stylesheet" type ="text/css" href ="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="range-selector-demo">
<div id="zoomed-chart" data-bind="dxChart: chartOptions"></div>
<div id="range-selector" data-bind="dxRangeSelector: rangeSelectorOptions"></div>
</div>
</div>
</body>
</html>
#range-selector-demo {
height: 480px;
width: 100%;
}
#zoomed-chart{
height: 335px;
margin: 0 0 15px;
}
#range-selector {
height: 80px;
}