Zooming in Blazor Charts Component
8 May 202414 minutes to read
Enable zooming
The chart can be zoomed in three different ways.
- Selection - By setting EnableSelectionZooming property to true in ChartZoomSettings, the chart can be zoomed using the rubber band selection.
- Mouse Wheel - By setting EnableMouseWheelZooming property to true in ChartZoomSettings, the chart can be zoomed-in and zoomed-out by scrolling the mouse wheel.
- Pinch - By setting EnablePinchZooming property to true in ChartZoomSettings, the chart can be zoomed through pinch gesture in touch enabled devices.
NOTE
- Pinch zooming is only usable in browsers that support multi-touch gestures.
- To zoom in on a rectangular area on a chart using a touch device, quickly double-tap and then drag your finger to define the zooming area.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>
<ChartZoomSettings EnableMouseWheelZooming="true" EnablePinchZooming="true" EnableSelectionZooming="true"></ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" XName="X" YName="YValue" Type="ChartSeriesType.Column"></ChartSeries>
</ChartSeriesCollection>
</SfChart>
@code{
public class ChartData
{
public string X { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { X= "USA", YValue= 46 },
new ChartData { X= "GBR", YValue= 27 },
new ChartData { X= "CHN", YValue= 26 },
new ChartData { X= "UK", YValue= 26 },
new ChartData { X= "AUS", YValue= 26 },
new ChartData { X= "IND", YValue= 26 },
new ChartData { X= "DEN", YValue= 26 },
new ChartData { X= "MEX", YValue= 26 },
};
}
A zooming toolbar will show after zooming the chart, featuring options for Zoom, Zoom In, Zoom Out, Pan, and Reset. The Pan option allows you to pan the chart, while the Reset option allows you to reset the zoomed chart.
Modes
The Mode property in ChartZoomSettings determines whether the chart can scale along the horizontal or vertical axes. The default value of the mode is XY (both axis).
There are three types of modes.
- 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.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>
<ChartZoomSettings EnableSelectionZooming="true" Mode="ZoomMode.X"></ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" XName="X" YName="YValue" Type="ChartSeriesType.Column"></ChartSeries>
</ChartSeriesCollection>
</SfChart>
@code{
public class ChartData
{
public string X { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { X= "USA", YValue= 46 },
new ChartData { X= "GBR", YValue= 27 },
new ChartData { X= "CHN", YValue= 26 },
new ChartData { X= "UK", YValue= 26 },
new ChartData { X= "AUS", YValue= 26 },
new ChartData { X= "IND", YValue= 26 },
new ChartData { X= "DEN", YValue= 26 },
new ChartData { X= "MEX", YValue= 26 },
};
}
Toolbar
By default, zoom in, zoom out, pan, and reset buttons are available in the toolbar for zoomed charts. The ToolbarItems property specifies which tools should be displayed in the toolbar.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>
<ChartZoomSettings EnableSelectionZooming="true" EnableMouseWheelZooming="true"
EnablePinchZooming="true" ToolbarItems="@ToolbarItem">
</ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" XName="X" YName="YValue" Type="ChartSeriesType.Column"></ChartSeries>
</ChartSeriesCollection>
</SfChart>
@code{
public List<ToolbarItems> ToolbarItem = new List<ToolbarItems>() { ToolbarItems.Zoom, ToolbarItems.Reset, ToolbarItems.Pan };
public class ChartData
{
public string X { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { X= "USA", YValue= 46 },
new ChartData { X= "GBR", YValue= 27 },
new ChartData { X= "CHN", YValue= 26 },
new ChartData { X= "UK", YValue= 26 },
new ChartData { X= "AUS", YValue= 26 },
new ChartData { X= "IND", YValue= 26 },
new ChartData { X= "DEN", YValue= 26 },
new ChartData { X= "MEX", YValue= 26 },
};
}
Toolbar display mode
By default, the zooming toolbar appears only when the chart is zoomed. However, you can display a zooming toolbar in the chart during the initial load by setting the ToolbarDisplayMode to ToolbarMode.Always.
@using Syncfusion.Blazor.Charts
<SfChart>
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>
<ChartZoomSettings EnableSelectionZooming="true" EnableMouseWheelZooming="true" EnablePinchZooming="true" ToolbarDisplayMode="ToolbarMode.Always">
</ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" XName="X" YName="YValue" Type="ChartSeriesType.Column"></ChartSeries>
</ChartSeriesCollection>
</SfChart>
@code {
public class ChartData1
{
public string X { get; set; }
public double YValue { get; set; }
}
public List<ChartData1> SalesReports = new List<ChartData1>
{
new ChartData1 { X= "USA", YValue= 50 },
new ChartData1 { X= "GBR", YValue= 20 },
new ChartData1 { X= "CHN", YValue= 26 },
new ChartData1 { X= "UK", YValue= 20 },
new ChartData1 { X= "AUS", YValue= 35 },
new ChartData1 { X= "IND", YValue= 15 },
new ChartData1 { X= "DEN", YValue= 40 },
new ChartData1 { X= "MEX", YValue= 30 },
};
}
Enable pan
By using the EnablePan property, one can pan the zoomed chart without the help of toolbar items.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category" ZoomFactor="0.2" ZoomPosition="0.6"></ChartPrimaryXAxis>
<ChartZoomSettings EnableSelectionZooming="true" EnablePan="true"></ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" XName="X" YName="YValue" Type="ChartSeriesType.Column"></ChartSeries>
</ChartSeriesCollection>
</SfChart>
@code{
public class ChartData
{
public string X { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { X= "USA", YValue= 46 },
new ChartData { X= "GBR", YValue= 27 },
new ChartData { X= "CHN", YValue= 26 },
new ChartData { X= "UK", YValue= 26 },
new ChartData { X= "AUS", YValue= 26 },
new ChartData { X= "IND", YValue= 26 },
new ChartData { X= "DEN", YValue= 26 },
new ChartData { X= "MEX", YValue= 26 },
};
}
Enable scrollbar
The EnableScrollbar property can be used to add a scrollbar to a zoomed chart. The chart can be panned or zoomed using this scrollbar.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis Title="Years" ValueType="Syncfusion.Blazor.Charts.ValueType.DateTime"
Skeleton="yMMM" EdgeLabelPlacement="EdgeLabelPlacement.Shift">
<ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
</ChartPrimaryXAxis>
<ChartPrimaryYAxis Title="Profit ($)" RangePadding="ChartRangePadding.None">
<ChartAxisLineStyle Width="0"></ChartAxisLineStyle>
<ChartAxisMajorTickLines Width="0"></ChartAxisMajorTickLines>
</ChartPrimaryYAxis>
<ChartLegendSettings Visible="false"></ChartLegendSettings>
<ChartZoomSettings EnableMouseWheelZooming="true" EnableScrollbar="true" EnablePinchZooming="true"
EnableSelectionZooming="true"></ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" Name="Warmest" XName="XValue" Width="2" Opacity="1"
YName="YValue" Type="ChartSeriesType.Area">
</ChartSeries>
</ChartSeriesCollection>
<ChartArea>
<ChartAreaBorder Width="0"></ChartAreaBorder>
</ChartArea>
</SfChart>
@code {
public class ChartData
{
public DateTime XValue { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { XValue = new DateTime(2000, 02, 11), YValue = 14 },
new ChartData { XValue = new DateTime(2000, 09, 04), YValue = 20 },
new ChartData { XValue = new DateTime(2001, 02, 11), YValue = 25 },
new ChartData { XValue = new DateTime(2001, 09, 16), YValue = 21 },
new ChartData { XValue = new DateTime(2002, 02, 07), YValue = 13 },
new ChartData { XValue = new DateTime(2002, 09, 07), YValue = 18 },
new ChartData { XValue = new DateTime(2003, 02, 11), YValue = 24 },
new ChartData { XValue = new DateTime(2003, 09, 14), YValue = 23 },
new ChartData { XValue = new DateTime(2004, 02, 06), YValue = 19 },
new ChartData { XValue = new DateTime(2004, 09, 06), YValue = 31 },
new ChartData { XValue = new DateTime(2005, 02, 11), YValue = 39 },
new ChartData { XValue = new DateTime(2005, 09, 11), YValue = 50 },
new ChartData { XValue = new DateTime(2006, 02, 11), YValue = 24 },
};
}
Auto interval on zooming
The axis interval will be calculated automatically with respect to the zoomed range, if the EnableAutoIntervalOnZooming property is set to true.
@using Syncfusion.Blazor.Charts
<SfChart Title="Sales History of Product X">
<ChartPrimaryXAxis Title="Years" ValueType="Syncfusion.Blazor.Charts.ValueType.DateTime"
Skeleton="yMMM" EdgeLabelPlacement="EdgeLabelPlacement.Shift" EnableAutoIntervalOnZooming="true">
<ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
</ChartPrimaryXAxis>
<ChartPrimaryYAxis Title="Profit ($)" RangePadding="ChartRangePadding.None">
<ChartAxisLineStyle Width="0"></ChartAxisLineStyle>
<ChartAxisMajorTickLines Width="0"></ChartAxisMajorTickLines>
</ChartPrimaryYAxis>
<ChartLegendSettings Visible="false"></ChartLegendSettings>
<ChartZoomSettings EnableMouseWheelZooming="true" EnablePinchZooming="true"
EnableSelectionZooming="true"></ChartZoomSettings>
<ChartSeriesCollection>
<ChartSeries DataSource="@SalesReports" Name="Warmest" XName="XValue" Width="2" Opacity="1"
YName="YValue" Type="ChartSeriesType.Area">
</ChartSeries>
</ChartSeriesCollection>
<ChartArea>
<ChartAreaBorder Width="0"></ChartAreaBorder>
</ChartArea>
</SfChart>
@code {
public class ChartData
{
public DateTime XValue { get; set; }
public double YValue { get; set; }
}
public List<ChartData> SalesReports = new List<ChartData>
{
new ChartData { XValue = new DateTime(2000, 02, 11), YValue = 14 },
new ChartData { XValue = new DateTime(2000, 09, 04), YValue = 20 },
new ChartData { XValue = new DateTime(2001, 02, 11), YValue = 25 },
new ChartData { XValue = new DateTime(2001, 09, 16), YValue = 21 },
new ChartData { XValue = new DateTime(2002, 02, 07), YValue = 13 },
new ChartData { XValue = new DateTime(2002, 09, 07), YValue = 18 },
new ChartData { XValue = new DateTime(2003, 02, 11), YValue = 24 },
new ChartData { XValue = new DateTime(2003, 09, 14), YValue = 23 },
new ChartData { XValue = new DateTime(2004, 02, 06), YValue = 19 },
new ChartData { XValue = new DateTime(2004, 09, 06), YValue = 31 },
new ChartData { XValue = new DateTime(2005, 02, 11), YValue = 39 },
new ChartData { XValue = new DateTime(2005, 09, 11), YValue = 50 },
new ChartData { XValue = new DateTime(2006, 02, 11), YValue = 24 },
};
}
NOTE
Refer to our Blazor Charts feature tour page for its groundbreaking feature representations and also explore our Blazor Chart Example to know various chart types and how to represent time-dependent data, showing trends at equal intervals.