Public Class ControlImageShowsInChartIssueForm
  Inherits Windows.Forms.Form

  Private _BackgroundControl As Windows.Forms.TextBox

  Private _ChartControl1 As Nevron.Chart.WinForm.NChartControl
  Private _ChartControl2 As Nevron.Chart.WinForm.NChartControl
  Private _ChartControls() As Nevron.Chart.WinForm.NChartControl
  Private _IndexOfVisibleChartControl As Integer

  Private WithEvents _Button1 As Windows.Forms.Button
  Private WithEvents _CheckBox1 As Windows.Forms.CheckBox
  
  Public Sub New()
  MyBase.New()
  Call InitializeControls()
  End Sub

  Private Sub InitializeControls()
  Me.Size = New Drawing.Size(1200, 900)
  Me.StartPosition = FormStartPosition.CenterScreen


  Dim lowResolutionDataSize As New Drawing.Size(20, 20)

  Const fillMode As Nevron.Chart.SurfaceFillMode = Nevron.Chart.SurfaceFillMode.Uniform
  'Const fillMode As Nevron.Chart.SurfaceFillMode = Nevron.Chart.SurfaceFillMode.ZoneTexture
  Const renderSurface As Nevron.GraphicsCore.RenderSurface = Nevron.GraphicsCore.RenderSurface.Window
  'Const renderSurface As Nevron.GraphicsCore.RenderSurface = Nevron.GraphicsCore.RenderSurface.Bitmap
  Const shadingMode As Nevron.Chart.ShadingMode = Nevron.Chart.ShadingMode.Smooth
  Const triangulationMode As Nevron.Chart.MeshSurfaceCellTriangulationMode = Nevron.Chart.MeshSurfaceCellTriangulationMode.MaxDiagonal

  Dim bounds As Drawing.Rectangle = Me.ClientRectangle
  Me._ChartControl1 = CreateChartControlWithMeshSurface(Me, "Chart #1", bounds, Drawing.Color.SlateBlue, fillMode, renderSurface, shadingMode, triangulationMode, lowResolutionDataSize)
  Me._ChartControl2 = CreateChartControlWithMeshSurface(Me, "Chart #2", bounds, Drawing.Color.Coral, fillMode, renderSurface, shadingMode, triangulationMode, lowResolutionDataSize)
  Me._ChartControls = {Me._ChartControl1, Me._ChartControl2}
  Me._IndexOfVisibleChartControl = 0

  Me._Button1 = New Windows.Forms.Button
  Me._Button1.Text = "Change Chart"
  Me._Button1.Location = New Drawing.Point(4, Me._ChartControl1.Bottom)
  Me._Button1.Width = 128
  Me.Height += (Me._Button1.Height)
  Me.Controls.Add(Me._Button1)

  Me._CheckBox1 = New Windows.Forms.CheckBox
  Me._CheckBox1.Text = "Render to Window"
  Me._CheckBox1.Location = New Drawing.Point(Me._Button1.Right + 4, Me._ChartControl1.Bottom)
  Me._CheckBox1.AutoSize = True
  Me._CheckBox1.Anchor = AnchorStyles.Left Or AnchorStyles.Bottom
  Me._CheckBox1.Checked = (renderSurface = Nevron.GraphicsCore.RenderSurface.Window)
  Me.Controls.Add(Me._CheckBox1)

  Call Me.UpdateVisibleChartControl(updateIndex:=False)


  Me._BackgroundControl = New Windows.Forms.TextBox
  Me._BackgroundControl.Anchor = AnchorStyles.Left Or AnchorStyles.Top Or AnchorStyles.Right Or AnchorStyles.Bottom
  Me._BackgroundControl.Multiline = True
  Me._BackgroundControl.Bounds = Me._ChartControl1.Bounds
  'Me._BackgroundControl.Size = Me.ClientSize
  Me._BackgroundControl.Text = System.String.Format("Click the ""Change Chart"" button several times.{0}{0}This control is hidden after the first time the ""Change Chart"" button is clicked so it should never be visible again.", System.Environment.NewLine)
  Me._BackgroundControl.BackColor = Drawing.Color.Red
  Me._BackgroundControl.ForeColor = Drawing.Color.Black
  Me._BackgroundControl.Font = New Drawing.Font(Me._BackgroundControl.Font.Name, 36, Drawing.FontStyle.Bold)
  Me._BackgroundControl.WordWrap = True
  Me._BackgroundControl.ScrollBars = ScrollBars.None
  Me.Controls.Add(Me._BackgroundControl)
  Me._BackgroundControl.BringToFront()
  End Sub

  Private Sub _Button_Click(sender As Object, e As System.EventArgs) Handles _Button1.Click
  If (Me._BackgroundControl.Visible) Then
  Me._BackgroundControl.Visible = False
  Me._BackgroundControl.Text = ""
  Me._BackgroundControl.BackColor = Drawing.Color.Blue
  Me._BackgroundControl.ForeColor = Drawing.Color.White
  End If

  Call Me.UpdateVisibleChartControl(updateIndex:=True)
  End Sub

  Private Sub _CheckBox1_CheckedChanged(sender As Object, e As System.EventArgs) Handles _CheckBox1.CheckedChanged
  Dim uBound As Integer = Me._ChartControls.GetUpperBound(0)
  For i As Integer = 0 To uBound
  With Me._ChartControls(i)
    If (Me._CheckBox1.Checked) Then
    .Settings.RenderSurface = Nevron.GraphicsCore.RenderSurface.Window
    Else
    .Settings.RenderSurface = Nevron.GraphicsCore.RenderSurface.Bitmap
    End If
  End With
  Next i
  End Sub

  Private Sub UpdateVisibleChartControl(ByVal updateIndex As Boolean)
  Dim uBound As Integer = Me._ChartControls.GetUpperBound(0)
  If updateIndex Then
  If (Me._IndexOfVisibleChartControl = uBound) Then
    Me._IndexOfVisibleChartControl = 0
  Else
    Me._IndexOfVisibleChartControl += 1
  End If
  End If

  Me._ChartControls(Me._IndexOfVisibleChartControl).Visible = True
  Me._ChartControls(Me._IndexOfVisibleChartControl).BringToFront()
  For i As Integer = 0 To uBound
  If (i <> Me._IndexOfVisibleChartControl) Then
    Me._ChartControls(i).Visible = False
  End If
  Next i
  End Sub

  Private Function CreateChartControlWithMeshSurface( _
  ByVal parent As Windows.Forms.Control, _
  ByVal title As String, _
  ByVal bounds As Drawing.Rectangle, _
  ByVal color As Drawing.Color, _
  ByVal fillMode As Nevron.Chart.SurfaceFillMode, _
  ByVal renderSurface As Nevron.GraphicsCore.RenderSurface, _
  ByVal shadingMode As Nevron.Chart.ShadingMode, _
  ByVal triangulationMode As Nevron.Chart.MeshSurfaceCellTriangulationMode, _
  ByVal dataSize As Drawing.Size) As Nevron.Chart.WinForm.NChartControl

  Dim chartControl As New Nevron.Chart.WinForm.NChartControl
  chartControl.Bounds = bounds
  chartControl.Settings.RenderSurface = renderSurface
  '
  chartControl.Controller.Tools.Add(New Nevron.Chart.Windows.NPanelSelectorTool())
  chartControl.Controller.Tools.Add(New Nevron.Chart.Windows.NTrackballTool())


  Dim titleLabel As Nevron.Chart.NLabel = chartControl.Labels.AddHeader(title)
  titleLabel.TextStyle.FontStyle = New Nevron.GraphicsCore.NFontStyle("Times New Roman", 18, Drawing.FontStyle.Italic)
  titleLabel.TextStyle.FillStyle = New Nevron.GraphicsCore.NColorFillStyle(Drawing.Color.FromArgb(64, 64, 255))


  Dim chart As Nevron.Chart.NChart = chartControl.Charts(0)
  chart.Enable3D = True
  chart.Width = 60.0F
  chart.Depth = 60.0F
  chart.Height = 25.0F
  chart.Projection.SetPredefinedProjection(Nevron.GraphicsCore.PredefinedProjection.PerspectiveTilted)
  chart.LightModel.SetPredefinedLightModel(Nevron.GraphicsCore.PredefinedLightModel.MetallicLustre)


  Dim linearScale As Nevron.Chart.NLinearScaleConfigurator = New Nevron.Chart.NLinearScaleConfigurator()
  linearScale.MajorGridStyle.SetShowAtWall(Nevron.Chart.ChartWallType.Floor, True)
  linearScale.MajorGridStyle.SetShowAtWall(Nevron.Chart.ChartWallType.Back, True)
  linearScale.RoundToTickMax = False
  linearScale.RoundToTickMin = False
  chart.Axis(Nevron.Chart.StandardAxis.PrimaryX).ScaleConfigurator = linearScale

  linearScale = New Nevron.Chart.NLinearScaleConfigurator()
  linearScale.MajorGridStyle.SetShowAtWall(Nevron.Chart.ChartWallType.Floor, True)
  linearScale.MajorGridStyle.SetShowAtWall(Nevron.Chart.ChartWallType.Left, True)
  linearScale.RoundToTickMax = False
  linearScale.RoundToTickMin = False
  chart.Axis(Nevron.Chart.StandardAxis.Depth).ScaleConfigurator = linearScale


  Dim surface As Nevron.Chart.NMeshSurfaceSeries = CType(chart.Series.Add(Nevron.Chart.SeriesType.MeshSurface), Nevron.Chart.NMeshSurfaceSeries)
  surface.Name = "Surface"
  surface.Legend.Mode = Nevron.Chart.SeriesLegendMode.None
  surface.FillMode = fillMode
  surface.SyncPaletteWithAxisScale = False
  surface.PaletteSteps = 8
  surface.ValueFormatter.FormatSpecifier = "0.00"
  '
  surface.FillStyle = New Nevron.GraphicsCore.NColorFillStyle(color)
  '
  surface.ShadingMode = shadingMode
  surface.CellTriangulationMode = triangulationMode
  '
  Call SetSurfaceData(surface, dataSize)


  parent.Controls.Add(chartControl)

  Return chartControl
  End Function

  Private Sub SetSurfaceData( _
  ByVal surface As Nevron.Chart.NMeshSurfaceSeries, _
  ByVal dataSize As Drawing.Size)

  Dim x, y, z As Double
  Dim width As Integer = dataSize.Width
  Dim height As Integer = dataSize.Height
  Dim positionScaleFactorX As Double = CDbl(width) / 20.0#
  Dim positionScaleFactorZ As Double = CDbl(height) / 20.0#
  Const positionRangeX As Double = 20.0#
  Const positionRangeZ As Double = 20.0#
  Const positionStartX As Double = -(0.5# * positionRangeX)
  Const positionStartZ As Double = -(0.5# * positionRangeZ)
  Dim deltaX As Double = (positionRangeX / CDbl(width - 1))
  Dim deltaZ As Double = (positionRangeZ / CDbl(height - 1))
  '
  surface.Data.SetGridSize(dataSize.Width, dataSize.Height)
  '
  For j As Integer = 0 To (height - 1)
  z = CDbl(j) * deltaZ + positionStartZ
  For i As Integer = 0 To (width - 1)
    x = CDbl(i) * deltaX + positionStartX

    y = Math.Sin(i / (3.0 * positionScaleFactorX)) * Math.Sin(j / (3.0 * positionScaleFactorZ))

    If y < 0 Then
    y = Math.Abs(y / 2.0)
    End If

    surface.Data.SetValue(i, j, y, x, z)
  Next i
  Next j
  End Sub

End Class