# IsoContours

VTKExamples/CSharp/ImplicitFunctions/IsoContours

### Description

A tutorial on how to setup a Windows Forms Application utilizing ActiViz.NET can be found here: Setup a Windows Forms Application to use ActiViz.NET

Note

As long as ActiViz.NET is not build with VTK version 6.0 or higher you must define the preprocessor directive VTK_MAJOR_VERSION_5.

Note

To use this example create a Windows Forms Application, delete Form1.Designer.cs and replace the content of Form1.cs with this:

### Code

IsoContours.cs

    using System;
    using System.ComponentModel;
    using System.Drawing;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    using System.Diagnostics;
    using Kitware.VTK;

    namespace ActiViz.Examples {
       public class Form1 : Form {
          private System.ComponentModel.IContainer components = null;
          private vtkContourFilter _ContourFilter;
          private vtkRenderWindow _RenderWindow;

          public Form1() {
             InitializeComponent();
             this.Size = new Size(620, 400);
          }

          private void Form1_Load(object sender, EventArgs e) {
             try {
                IsoContours();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void sliderContourValue_Scroll(object sender, EventArgs e) {
             TrackBar slider = sender as TrackBar;
             if(slider != null) {
                _ContourFilter.GenerateValues(1, slider.Value, slider.Value);
                _RenderWindow.Render();
             }
          }

          private void IsoContours() {
             vtkImageData data = vtkImageData.New();
             CreateData(ref data);

             // Create an isosurface
             _ContourFilter = vtkContourFilter.New();
    #if VTK_MAJOR_VERSION_5
             _ContourFilter.SetInput(data);
    #else
             contourFilter.SetInputData(data);
    #endif
             _ContourFilter.GenerateValues(1, 10, 10); // (numContours, rangeStart, rangeEnd)

             // Map the contours to graphical primitives
             vtkPolyDataMapper contourMapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             contourMapper.SetInputConnection(_ContourFilter.GetOutputPort());
    #else
             contourMapper.SetInputData(contourFilter);
    #endif
             // Create an actor for the contours
             vtkActor contourActor = vtkActor.New();
             contourActor.SetMapper(contourMapper);

             // Create the outline
             vtkOutlineFilter outlineFilter = vtkOutlineFilter.New();
             vtkPolyDataMapper outlineMapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             outlineFilter.SetInput(data);
             outlineMapper.SetInputConnection(outlineFilter.GetOutputPort());
    #else
             outlineFilter.SetInputData(data);
             outlineMapper.SetInputData(outlineFilter);
    #endif
             vtkActor outlineActor = vtkActor.New();
             outlineActor.SetMapper(outlineMapper);

             // get a reference to the renderwindow of our renderWindowControl1
             _RenderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = _RenderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(.2, .3, .4);
             // add our actor to the renderer
             renderer.AddActor(contourActor);
             renderer.AddActor(outlineActor);
          }

          void CreateData(ref vtkImageData data) {
             data.SetExtent(-25, 25, -25, 25, 0, 0);
    #if VTK_MAJOR_VERSION_5
             data.SetNumberOfScalarComponents(1);
             data.SetScalarTypeToDouble();
    #else
             data.AllocateScalars(VTK_DOUBLE,1);
    #endif
             int[] extent = data.GetExtent();

             for(int y = extent[2]; y <= extent[3]; y++) {
                for(int x = extent[0]; x <= extent[1]; x++) {
                   IntPtr ptr = data.GetScalarPointer(x, y, 0);
                   double[] pixel = new double[] { Math.Sqrt(Math.Pow(x, 2.0) + Math.Pow(y, 2.0)) };
                   Marshal.Copy(pixel, 0, ptr, 1);
                }
             }

             vtkXMLImageDataWriter writer = vtkXMLImageDataWriter.New();
             writer.SetFileName(@"c:\vtk\vtkdata-5.8.0\Data\testIsoContours.vti");
    #if VTK_MAJOR_VERSION_5
             writer.SetInputConnection(data.GetProducerPort());
    #else
             writer.SetInputData(data);
    #endif
             writer.Write();
          }

          /// <summary>
          /// Clean up any resources being used.
          /// </summary>
          /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
          protected override void Dispose(bool disposing) {
             if(disposing && ( components != null )) {
                components.Dispose();
             }
             base.Dispose(disposing);
          }

          #region Windows Form Designer generated code

          /// <summary>
          /// Required method for Designer support - do not modify
          /// the contents of this method with the code editor.
          /// </summary>
          private void InitializeComponent() {
             this.splitContainer1 = new System.Windows.Forms.SplitContainer();
             this.lblSliderMaxValue = new System.Windows.Forms.Label();
             this.lblSliderMinValue = new System.Windows.Forms.Label();
             this.lblSliderTitle = new System.Windows.Forms.Label();
             this.sliderContourValue = new System.Windows.Forms.TrackBar();
             this.renderWindowControl1 = new Kitware.VTK.RenderWindowControl();
             this.splitContainer1.Panel1.SuspendLayout();
             this.splitContainer1.Panel2.SuspendLayout();
             this.splitContainer1.SuspendLayout();
             ((System.ComponentModel.ISupportInitialize)(this.sliderContourValue)).BeginInit();
             this.SuspendLayout();
             //
             // splitContainer1
             //
             this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
             this.splitContainer1.FixedPanel = System.Windows.Forms.FixedPanel.Panel1;
             this.splitContainer1.IsSplitterFixed = true;
             this.splitContainer1.Location = new System.Drawing.Point(0, 0);
             this.splitContainer1.Name = "splitContainer1";
             //
             // splitContainer1.Panel1
             //
             this.splitContainer1.Panel1.Controls.Add(this.lblSliderMaxValue);
             this.splitContainer1.Panel1.Controls.Add(this.lblSliderMinValue);
             this.splitContainer1.Panel1.Controls.Add(this.lblSliderTitle);
             this.splitContainer1.Panel1.Controls.Add(this.sliderContourValue);
             //
             // splitContainer1.Panel2
             //
             this.splitContainer1.Panel2.Controls.Add(this.renderWindowControl1);
             this.splitContainer1.Size = new System.Drawing.Size(604, 362);
             this.splitContainer1.SplitterDistance = 213;
             this.splitContainer1.SplitterWidth = 1;
             this.splitContainer1.TabIndex = 0;
             //
             // lblSliderMaxValue
             //
             this.lblSliderMaxValue.AutoSize = true;
             this.lblSliderMaxValue.Location = new System.Drawing.Point(176, 69);
             this.lblSliderMaxValue.Name = "lblSliderMaxValue";
             this.lblSliderMaxValue.Size = new System.Drawing.Size(19, 13);
             this.lblSliderMaxValue.TabIndex = 1;
             this.lblSliderMaxValue.Text = "30";
             //
             // lblSliderMinValue
             //
             this.lblSliderMinValue.AutoSize = true;
             this.lblSliderMinValue.Location = new System.Drawing.Point(21, 69);
             this.lblSliderMinValue.Name = "lblSliderMinValue";
             this.lblSliderMinValue.Size = new System.Drawing.Size(13, 13);
             this.lblSliderMinValue.TabIndex = 1;
             this.lblSliderMinValue.Text = "1";
             //
             // lblSliderTitle
             //
             this.lblSliderTitle.AutoSize = true;
             this.lblSliderTitle.Location = new System.Drawing.Point(18, 11);
             this.lblSliderTitle.Name = "lblSliderTitle";
             this.lblSliderTitle.Size = new System.Drawing.Size(74, 13);
             this.lblSliderTitle.TabIndex = 1;
             this.lblSliderTitle.Text = "Contour Value";
             //
             // sliderContourValue
             //
             this.sliderContourValue.Location = new System.Drawing.Point(12, 37);
             this.sliderContourValue.Maximum = 30;
             this.sliderContourValue.Minimum = 1;
             this.sliderContourValue.Name = "sliderContourValue";
             this.sliderContourValue.Size = new System.Drawing.Size(186, 45);
             this.sliderContourValue.TabIndex = 0;
             this.sliderContourValue.TickFrequency = 5;
             this.sliderContourValue.Value = 10;
             this.sliderContourValue.Scroll += new System.EventHandler(this.sliderContourValue_Scroll);
             //
             // renderWindowControl1
             //
             this.renderWindowControl1.AddTestActors = false;
             this.renderWindowControl1.Dock = System.Windows.Forms.DockStyle.Fill;
             this.renderWindowControl1.Location = new System.Drawing.Point(0, 0);
             this.renderWindowControl1.Name = "renderWindowControl1";
             this.renderWindowControl1.Size = new System.Drawing.Size(390, 362);
             this.renderWindowControl1.TabIndex = 0;
             this.renderWindowControl1.TestText = null;
             //
             // Form1
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(604, 362);
             this.Controls.Add(this.splitContainer1);
             this.Name = "Form1";
             this.Text = "IsoContours";
             this.Load += new System.EventHandler(this.Form1_Load);
             this.splitContainer1.Panel1.ResumeLayout(false);
             this.splitContainer1.Panel1.PerformLayout();
             this.splitContainer1.Panel2.ResumeLayout(false);
             this.splitContainer1.ResumeLayout(false);
             ((System.ComponentModel.ISupportInitialize)(this.sliderContourValue)).EndInit();
             this.ResumeLayout(false);

          }

          #endregion

          private System.Windows.Forms.SplitContainer splitContainer1;
          private System.Windows.Forms.Label lblSliderTitle;
          private System.Windows.Forms.TrackBar sliderContourValue;
          private Kitware.VTK.RenderWindowControl renderWindowControl1;
          private System.Windows.Forms.Label lblSliderMaxValue;
          private System.Windows.Forms.Label lblSliderMinValue;
       }
    }