ComponentOne Xamarin.iOS Documentation
Controls / FlexChart / Features / Zooming and Panning
In This Topic
    Zooming and Panning
    In This Topic

    Zooming can be performed in FlexChart chart using ZoomBehavior class. To implement zooming, you need to create an object of ZoomBehavior class available in the C1.iOS.Chart.Interaction namespace and pass it as a parameter to the Add method. This method adds zoom behavior to the behavior collection by accessing it through Behaviors property of the ChartBase class. In addition, you can use the ZoomMode property to enable touch based zooming in FlexChart. This property sets the gesture direction of zoom behavior through GestureMode enumeration which provides four zoom modes given below:

    The following code examples demonstrate how to implement zooming in C#. These examples use the sample created in the Quick Start section.

    C#
    Copy Code
    ZoomBehavior z = new ZoomBehavior();
    z.ZoomMode = GestureMode.X;
    chart.Behaviors.Add(z);
    

    Similarly, panning can be implemented in FlexChart chart by creating an object of TranslateBehavior class available in the C1.iOS.Chart.Interaction namespace and passing it as a parameter to the Add method. This method adds translation behavior to the behavior collection by accessing it through Behaviors property of the ChartBase class.

    The following code examples demonstrate how to implement panning in C#. These examples use the sample created in the Quick Start section.

    C#
    Copy Code
    TranslateBehavior t = new TranslateBehavior();
    chart.Behaviors.Add(t);
            
    chart.Scale = 1.5;chart.AxisX.DisplayedRange = 4;
    

    In addition to zooming and panning, FlexChart allows you to customize the relative range of values displayed in the view through Scale property, so if you set it to 0.5 it will display 50% of the axis in view (you can pan to the other 50%). Alternatively, FlexChart also allows you to set the absolute range of values displayed in the view through DisplayRange property. You can set this property on the chart axis directly or on the x or y axis separately.