ScatterGraph Point label

Hi all,

I did managed to derive a CustomCursor of XYCursor at the point of being able to display an icon, or a label.

I have also managed to create a CustomGraph derived from a diagram of dispersion and to specify the color of each point of the plot in a range of colors for every points.

For my CustomCurosr, it seems very pretty because I managed to make the bottom of the color of the label semi transparent and to use small fonts. I will be able to specify the labels for the points of a ScatterGraph (in the same way). Has anyone managed to do this?

Thank you

cdouillet

PS: I am happy to give my code VB for CustomCursor and CustomScatterGraph if anyone is interested.

Hey,.

Looks like you worked a lot with the MStudio controls. Nice!

I wrote a code and rendered graphic to display labels. Here's the screenshot and the code snippet.

I hope this helps. If this isn't the case, could attach you a screenshot of the graph showing how the chart should look like? If possible, you could join the snippet for custom classes. These would help us better understand what you plan to do with the chart control.

In summary:

Code snippet:

Public Class MyScatterPlot    Inherits ScatterPlot    Protected Overrides Sub OnBeforeDraw(ByVal e As BeforeDrawXYPlotEventArgs)        ' Let the base type do its drawing first.        MyBase.OnBeforeDraw(e)

        ' Get the data points and mapped coordinates in pixels.        Dim points As PointF() = MapDataPoints(e.Bounds)        Dim xData As Double() = GetXData()        Dim yData As Double() = GetYData()

        ' Draw label for each data point.        For i As Integer = 0 To points.Length - 1            DrawLabel(e.Graphics, points(i), xData(i), yData(i))        Next    End Sub

    Private Sub DrawLabel(ByVal g As Graphics, ByVal pointF As PointF, ByVal xData As Double, ByVal yData As Double)        ' Setup the font, label and colors.        Dim label As String = xData.ToString() + ", " + yData.ToString()        Dim font As Font = New System.Drawing.Font("Verdana", 8, FontStyle.Regular)        Dim fillColor As Color = Color.FromArgb(128, Color.Gray)        Dim labelColor As Color = Color.White        Dim borderColor As Color = Color.LightGray

        ' Calculate the positions of the rectangle to be drawn.        Dim size As SizeF = g.MeasureString(label, font)        Dim r As RectangleF = RectangleF.Empty        r.Location = New PointF(pointF.X + 5, pointF.Y - 5 - font.Height)        r.Size = New SizeF(size.Width, size.Height)

        ' Do the drawing here. First draw the rectangle, fill it with some color and then draw the string.        g.FillRectangle(New SolidBrush(fillColor), r)        g.DrawRectangle(New Pen(borderColor), r.Left, r.Top, r.Width, r.Height)        g.DrawString(label, font, New SolidBrush(labelColor), r.Location)    End SubEnd Class

Habim stone,

National Instruments

Tags: NI Software

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