Point cloud: color gradient


I can't find an example where I can create a custom class plot. I have to be able to line the plot of color based on the value of Y and make it look like a smooth gradient. Ideally, I would like to change the size of the line as well. This would allow me to "draw" the 3 variables using a 2D graph. I started (VB.Net):

Imports NationalInstruments.UI

Public Class clCustomPlot

Inherits from point cloud

Public Sub New()


End Sub

Protected / Sub OnBeforeDraw(ByVal sender As Object, ByVal e As NationalInstruments.UI.BeforeDrawXYPlotEventArgs)
End Sub

End Class

But VS tells me that:

Void of MeasStudioGraphLineColour error 'OnBeforeDraw' cannot be declared 'overrides' because it does not replace a sub in a base class.
Thanks for your help,


I got it to work! For all those who are interested, here's a VB.Net custom dispersion diagram that will show you how/color along the line of control.

Imports NationalInstruments.UI

Imports System.Drawing

Imports System.Drawing.Drawing2D

Public Class clCustomScatterPlot

Inherits from point cloud

Private dblMin As Double

Private dblMax As Double

Private colMinColour As System.Drawing.Color

Private colMaxColour As System.Drawing.Color

Public Sub New (ByVal MinValue As Double, ByVal MaxValue As Double _)

ByVal MinValueColour As System.Drawing.Color, ByVal MaxValueColour As System.Drawing.Color)


"no check is performed for the fact that MinValue<>

dblMin = MinValue

dblMax = MaxValue

colMinColour = MinValueColour

colMaxColour = MaxValueColour

End Sub

Protected override void OnBeforeDraw (ByVal e As BeforeDrawXYPlotEventArgs)

"Clip data, browse the data cut, map and draw."

Dim intrigues as XYPlot = e.Plot

Var clippedXData() As Double = Nothing

Var clippedYData() As Double = Nothing

parcel of land. ClipDataPoints (clippedXData, clippedYData)

For i As Integer = 0 To clippedXData.Length - 2

Protected x 1 Double = clippedXData (i)

Protected x 2 = Double clippedXData (i + 1)

Var y1 As Double = clippedYData (i)

Var y2 As Double = clippedYData (i + 1)

Dim point1 As PointF = plot. MapDataPoint (e.Bounds, x 1, y1)

Dim point2 As PointF = plot. MapDataPoint (e.Bounds, x 2, y2)

Var pen As Pen = New Pen (ValueToColour (y2))

Dim g As Graphics = e.Graphics

g.DrawLines (pen, new PointF() {point1, point2})


e.Cancel = True

End Sub

Private Function ValueToColour(ByVal value As Double) As Color

If value<= dblmin="" then="" return="">

If value > = dblMax then return colMaxColour

Pctg As Double = (value - dblMin) / (dblMax - dblMin)

Dim a, r, g, b As Integer

a = CInt (CInt (colMinColour.A) + pctg * (CInt (colMaxColour.A) - CInt (colMinColour.A)))

r = CInt (CInt (colMinColour.R) + pctg * (CInt (colMaxColour.R) - CInt (colMinColour.R)))

g = CInt (CInt (colMinColour.G) + pctg * (CInt (colMaxColour.G) - CInt (colMinColour.G)))

b = CInt (CInt (colMinColour.B) + pctg * (CInt (colMaxColour.B) - CInt (colMinColour.B)))

r = Math.Max (0, r): r = Math.Min (255, r)

g = Math.Max (0, g): g = Math.Min (255, g)

b = Math.Max (0, b): b = Math.Min (255, b)

Return System.Drawing.Color.FromArgb (a, r, g, b).

Var col As Color = System.Drawing.Color.FromArgb (a, r, g, b).

Return col

End Function

End Class

Tags: NI Software

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