Zooming and Panning

15 Mar 202212 minutes to read

Enable Zooming

Chart can be zoomed in three ways.

  • Selection - By setting enableSelectionZooming property to true in zoomSettings, you can zoom the chart using the rubber band selection.
  • Mousewheel - By setting enableMouseWheelZooming property to true in zoomSettings, you can zoomin and zoomout the chart by scrolling the mouse wheel.
  • Pinch - By setting enablePinchZooming property to true in zoomSettings, you can zoom the chart through pinch gesture in touch enabled devices.

Pinch zooming is supported only in browsers that support multi-touch gestures. Currently IE11, Chrome and Opera browsers support multi-touch in desktop devices.

<ejs-chart id="container" load="window.load" width="60%">
        <e-chart-primaryxaxis valueType="DateTime"></e-chart-primaryxaxis>
        <e-chart-legendsettings visible="false"></e-chart-legendsettings>
        <e-chart-zoomsettings enableMouseWheelZooming="true" enablePinchZooming="true" enableSelectionZooming="true"></e-chart-zoomsettings>
        <e-series-collection>
            <e-series xName="x" width=2 yName="y" type="@Syncfusion.EJ2.Charts.ChartSeriesType.Area"></e-series>
        </e-series-collection>
</ejs-chart>
<script>
    var series1 = [];
    var point1;
    var value = 40;
    var i;
    for (i = 1; i < 500; i++) {
        if (Math.random() > .5) {
            value += Math.random();
        }
        else {
            value -= Math.random();
        }
        point1 = { x: new Date(1950, i + 2, i), y: value.toFixed(1) };
        series1.push(point1);
    }
    window.load = function (args) {
        args.chart.series[0].dataSource = series1;
    }
</script>
public IActionResult Index()
        {
            return View();
        }

After zooming the chart, a zooming toolbar will appear with zoom,zoomin, zoomout, pan and reset buttons. Selecting the Pan option will allow to pan the chart and selecting the Reset option will reset the zoomed chart.

Modes

The mode property in zoomSettings specifies whether the chart is allowed to scale along the horizontal axis or vertical axis. The default value of the mode is XY (both axis).

There are three types of mode.

  • X - Allows us to zoom the chart horizontally.
  • Y - Allows us to zoom the chart vertically.
  • XY - Allows us to zoom the chart both vertically and horizontally.
<ejs-chart id="container" load="window.load" width="60%">
        <e-chart-primaryxaxis valueType="DateTime"></e-chart-primaryxaxis>
        <e-chart-legendsettings visible="false"></e-chart-legendsettings>
        <e-chart-zoomsettings enableSelectionZooming="true" mode="X"></e-chart-zoomsettings>
        <e-series-collection>
            <e-series xName="x" width=2 yName="y" type="@Syncfusion.EJ2.Charts.ChartSeriesType.Area"></e-series>
        </e-series-collection>
    </ejs-chart>
<script>
    var series1 = [];
    var point1;
    var value = 40;
    var i;
    for (i = 1; i < 500; i++) {
        if (Math.random() > .5) {
            value += Math.random();
        }
        else {
            value -= Math.random();
        }
        point1 = { x: new Date(1950, i + 2, i), y: value.toFixed(1) };
        series1.push(point1);
    }
    window.load = function (args) {
        args.chart.series[0].dataSource = series1;
    }
</script>
public IActionResult Index()
        {
            return View();
        }

Toolbar

By default, zoomin, zoomout, pan and reset buttons will be displayed for zoomed chart. You can customize to show your desire tools in the toolbar using toolbarItems property.

<ejs-chart id="container" load="window.load" width="60%">
        <e-chart-primaryxaxis valueType="DateTime"></e-chart-primaryxaxis>
        <e-chart-legendsettings visible="false"></e-chart-legendsettings>
        <e-chart-zoomsettings enableSelectionZooming="true" toolbarItems="ViewBag.toolBarItems"></e-chart-zoomsettings>
        <e-series-collection>
            <e-series xName="x" width=2 yName="y" type="@Syncfusion.EJ2.Charts.ChartSeriesType.Area"></e-series>
        </e-series-collection>
    </ejs-chart>
<script>
    var series1 = [];
    var point1;
    var value = 40;
    var i;
    for (i = 1; i < 500; i++) {
        if (Math.random() > .5) {
            value += Math.random();
        }
        else {
            value -= Math.random();
        }
        point1 = { x: new Date(1950, i + 2, i), y: value.toFixed(1) };
        series1.push(point1);
    }
    window.load = function (args) {
        args.chart.series[0].dataSource = series1;
    }
</script>
public IActionResult Index()
        {
            ViewBag.toolBarItems = new String[] { "Zoom", "Pan", "Reset" };
            return View();
        }

Enable pan

Using enablePan property, you can pan the zoomed chart without the help of toolbar items.

<ejs-chart id="container" load="window.load" width="60%">
        <e-chart-primaryxaxis valueType="DateTime" zoomFactor=0.2 zoomPosition=0.6></e-chart-primaryxaxis>
        <e-chart-legendsettings visible="false"></e-chart-legendsettings>
        <e-chart-zoomsettings enableSelectionZooming="true" enablePan="true"></e-chart-zoomsettings>
        <e-series-collection>
            <e-series xName="x" width=2 yName="y" type="@Syncfusion.EJ2.Charts.ChartSeriesType.Area"></e-series>
        </e-series-collection>
    </ejs-chart>
<script>
    var series1 = [];
    var point1;
    var value = 40;
    var i;
    for (i = 1; i < 500; i++) {
        if (Math.random() > .5) {
            value += Math.random();
        }
        else {
            value -= Math.random();
        }
        point1 = { x: new Date(1950, i + 2, i), y: value.toFixed(1) };
        series1.push(point1);
    }
    window.load = function (args) {
        args.chart.series[0].dataSource = series1;
    }
</script>
public IActionResult Index()
        {
            return View();
        }

Auto interval on zooming

By using enableAutoIntervalOnZooming property, the axis interval will get calculated automatically with respect to the zoomed range.

<ejs-chart id="container" load="window.load" width="60%">
        <e-chart-primaryxaxis valueType="DateTime" enableAutoIntervalOnZooming="true"></e-chart-primaryxaxis>
        <e-chart-legendsettings visible="false"></e-chart-legendsettings>
        <e-chart-zoomsettings enableSelectionZooming="true"></e-chart-zoomsettings>
        <e-series-collection>
            <e-series xName="x" width=2 yName="y" type="@Syncfusion.EJ2.Charts.ChartSeriesType.Area"></e-series>
        </e-series-collection>
    </ejs-chart>
<script>
    var series1 = [];
    var point1;
    var value = 40;
    var i;
    for (i = 1; i < 500; i++) {
        if (Math.random() > .5) {
            value += Math.random();
        }
        else {
            value -= Math.random();
        }
        point1 = { x: new Date(1950, i + 2, i), y: value.toFixed(1) };
        series1.push(point1);
    }
    window.load = function (args) {
        args.chart.series[0].dataSource = series1;
    }
</script>
public IActionResult Index()
        {
            return View();
        }