LineChart.CalculateFunction Property

Invokes a custom function that calculates the values for the chart.

Namespace: MindFusion.Charting.WinForms
Assembly: MindFusion.Charting.WinForms

 Syntax

C#

public CalculateFunctionDelegate CalculateFunction { get; set; }

Visual Basic

Public Property CalculateFunction As CalculateFunctionDelegate

 Property Value

An instance of type MindFusion.Charting.CalculateFunctionDelegate.

 Remarks

The delegate enables custom functions to be computed and drawn rather than settings numbers with XData and YData. The delegate's function argument specifies the numerical interval, in which the function is computed. To raise the CalculateFunction event, provide a method that calculates the value of a float argument and returns float result. Then, assign the method to an instance of the CalculateFunctionDelegate delegate.

 Example

The following example:

• Creates a line chart
• Sets the chart data with a delegate, which calculates the sine function in the interval [-3, 3];

C#

/// <summary>
/// The sine function.
/// </summary>
public float CalculateFunction(float xVal, MindFusion.Charting.FunctionArgs e)
{
 return (float)Math.Sin((double)xVal);
}

// ...

// Create the chart
MindFusion.Charting.LineChart chart = new MindFusion.Charting.LineChart(MindFusion.Charting.LineTypes.Line);

// Add the delegate
chart.CalculateFunction = new MindFusion.Charting.CalculateFunctionDelegate(CalculateFunction);

// Set the interval of calculation
chart.FunctionArguments = new MindFusion.Charting.FunctionArgs(-3, 3);