ILNumerics 3D Contour plots legend is not displayed why? - ilnumerics

Question

I use to create a surface contour of the 3D contour plots.
I have now been drawing contour lines in my 3D figure, this also works wonderfully, but the legend is not displayed why?
code:
private void button1_Click(object sender, EventArgs e)
{
ILArray<float> data = ILSpecialData.sincf(50, 50);
BackgroundWorker bgw = new BackgroundWorker();
bgw.DoWork += bgwCreateProcess_DoWork;
bgw.RunWorkerAsync(data);
}
private void bgwCreateProcess_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
ILArray<float> data = e.Argument as ILArray<float>;
using (ILScope.Enter())
{
ILScene scene = new ILScene();
ILPlotCube plotCube = new ILPlotCube(twoDMode: false);
plotCube.Rotation = Matrix4.Rotation(new Vector3(1, 0, 0), Math.PI / 2);
ILSurface surface = new ILSurface(data);
List<ContourLevel> conturLevels = new List<ContourLevel>();
conturLevels.Add(new ContourLevel() { Text = "Limit Max", Value = 0.9f, LineWidth = 2 });
conturLevels.Add(new ContourLevel() { Text = "Limit Min", Value = -0.1f, LineWidth = 2 });
conturLevels.Add(new ContourLevel() { Text = "Average", Value = 0.5f, LineWidth = 3 });
ILContourPlot contourPlot = new ILContourPlot(data, conturLevels, create3D: true);
plotCube.Children.Add(contourPlot);
ILLegend legend = new ILLegend();
legend.Location = new PointF(.99f, 0f);
surface.Children.Add(legend);
ILColorbar colorbar = new ILColorbar();
colorbar.Location = new PointF(.99f, 0.4f);
surface.Children.Add(colorbar);
surface.Markable = false;
surface.Fill.Markable = false;
surface.Wireframe.Markable = false;
surface.Wireframe.Visible = true;
surface.UseLighting = false;
plotCube.Add(surface);
scene.Add(plotCube);
ilPanel.Scene = scene;
}
}
This code should be extended to a winform, a ILPanel and a button. Last but the Click event of the button has to be subscribed. Less code is not possible, because otherwise the situation is changed.

Answer 1

Felix, there are several issues in the code. Some of them are related to a bug in ILNumerics which will be fixed in the next version. The following code creates an image like that:
private void button1_Click(object sender, EventArgs e) {
ILArray<float> data = ILSpecialData.sincf(50, 50);
BackgroundWorker bgw = new BackgroundWorker();
bgw.DoWork += bgwCreateProcess_DoWork;
bgw.RunWorkerAsync(data);
}
private void bgwCreateProcess_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) {
using (ILScope.Enter()) {
ILArray<float> data = e.Argument as ILArray<float>;
ILScene scene = new ILScene();
ILPlotCube plotCube = new ILPlotCube(twoDMode: false);
plotCube.Rotation = Matrix4.Rotation(new Vector3(1, 0, 0), Math.PI / 2);
ILSurface surface = new ILSurface(data);
List<ContourLevel> conturLevels = new List<ContourLevel>();
conturLevels.Add(new ContourLevel() { Text = "Limit Max", Value = 0.9f, LineWidth = 2 });
conturLevels.Add(new ContourLevel() { Text = "Limit Min", Value = -0.1f, LineWidth = 2 });
conturLevels.Add(new ContourLevel() { Text = "Average", Value = 0.5f, LineWidth = 3 });
ILContourPlot contourPlot = new ILContourPlot(data, conturLevels, create3D: true);
plotCube.Add(contourPlot);
ILLegend legend = new ILLegend("one","two","three","four");
legend.Location = new PointF(.99f, 0f);
ILColorbar colorbar = new ILColorbar();
colorbar.Location = new PointF(.99f, 0.4f);
surface.Add(colorbar);
surface.Markable = false;
surface.Fill.Markable = false;
surface.Wireframe.Markable = false;
surface.Wireframe.Visible = true;
surface.UseLighting = false;
plotCube.Add(surface);
surface.Fill.Visible = false;
scene.Add(plotCube);
contourPlot.Add(legend);
legend.Configure(); // only needed in version 3.2.2.0!
scene.Configure();
ilPanel1.Scene = scene;
}
}
Let's step through the code:
As you see, I hided the surface fill color. Otherwise, the labels of the contour plot might get hidden by the surface.
Legends should be added to the plot they are about to describe. I added the legend to the contourplot instead of the surface. However, for some reasons, the legend does not automatically find the contour lines from the contour plot, so...
... I added the legend entries manually in the legend constructor. Here, I just used the strings "one"... "three". You will want to replace that with your own names.
Due to the bug I mentioned, you will have to call legend.Configure() explicitely. This will not be needed after version 3.2.2.0.
You are doing the scene modifications in a background worker thread - which is fine! However, after having finished the configuration, the panel must be signaled to refresh itself. ilPanel.Refresh(), however, requires to be called from the main (GUI-) thread. So I suspect, you could use Control.Invoke() at the end of bgwCreateProcess_DoWork in order to call ilPanel.Refresh(). Otherwise, the changes will not display.