# ParametricObjectsDemo

VTKExamples/CSharp/GeometricObjects/ParametricObjectsDemo

### 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

### Code

ParametricObjectsDemo.cs

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Windows.Forms;
    using System.Diagnostics;

    using Kitware.VTK;

    namespace ActiViz.Examples {
       public partial class Form1 : Form {
          public Form1() {
             InitializeComponent();
          }

          private void renderWindowControl1_Load(object sender, EventArgs e) {
             try {
                ParametricObjectsDemo();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void ParametricObjectsDemo() {
             // we create a matrix of 4x4 renderer in our renderwindow
             // each renderer can be interacted with independently from one another
             int rendererSize = 189; // width per renderer
             int gridDimensions = 4;
             this.Size = new System.Drawing.Size(756, 756);
             Random rnd = new Random(2);
             List<vtkParametricFunction>  parametricObjects = new List<vtkParametricFunction>();
             parametricObjects.Add(vtkParametricBoy.New());
             parametricObjects.Add(vtkParametricConicSpiral.New());
             parametricObjects.Add(vtkParametricCrossCap.New());
             parametricObjects.Add(vtkParametricDini.New());
             vtkParametricEllipsoid ellipsoid = vtkParametricEllipsoid.New();
             ellipsoid.SetXRadius(0.5);
             ellipsoid.SetYRadius(2.0);
             parametricObjects.Add(ellipsoid);
             parametricObjects.Add(vtkParametricEnneper.New());
             parametricObjects.Add(vtkParametricFigure8Klein.New());
             parametricObjects.Add(vtkParametricKlein.New());
             parametricObjects.Add(vtkParametricMobius.New());
             vtkParametricRandomHills randomHills = vtkParametricRandomHills.New();
             randomHills.AllowRandomGenerationOff();
             parametricObjects.Add(randomHills);
             parametricObjects.Add(vtkParametricRoman.New());
             vtkParametricSuperEllipsoid superEllipsoid = vtkParametricSuperEllipsoid.New();
             superEllipsoid.SetN1(.50);
             superEllipsoid.SetN2(.1);
             parametricObjects.Add(superEllipsoid);
             vtkParametricSuperToroid superToroid = vtkParametricSuperToroid.New();
             superToroid.SetN1(0.2);
             superToroid.SetN2(3.0);
             parametricObjects.Add(superToroid);
             parametricObjects.Add(vtkParametricTorus.New());

             vtkParametricSpline spline = vtkParametricSpline.New();
             vtkPoints inputPoints = vtkPoints.New();
             vtkMath.RandomSeed(8775070);
             for(int p = 0; p < 10; p++) {
                double x = vtkMath.Random(0.0, 1.0);
                double y = vtkMath.Random(0.0, 1.0);
                double z = vtkMath.Random(0.0, 1.0);
                inputPoints.InsertNextPoint(x, y, z);
             }
             spline.SetPoints(inputPoints);

             parametricObjects.Add(spline);

             List<vtkParametricFunctionSource> parametricFunctionSources = new List<vtkParametricFunctionSource>();
             List<vtkRenderer> renderers = new List<vtkRenderer>();
             List<vtkPolyDataMapper> mappers = new List<vtkPolyDataMapper>();
             List<vtkActor> actors = new List<vtkActor>();
             List<vtkTextMapper> textMappers = new List<vtkTextMapper>();
             List<vtkActor2D> textActors = new List<vtkActor2D>();

             // Create one text property for all
             vtkTextProperty textProperty = vtkTextProperty.New();
             textProperty.SetFontSize(12);
             textProperty.SetJustificationToCentered();

             // Create a source, renderer, mapper, and actor
             // for each object
             for(int i = 0; i < parametricObjects.Count; i++) {
                parametricFunctionSources.Add(vtkParametricFunctionSource.New());
                parametricFunctionSources[i].SetParametricFunction(parametricObjects[i]);
                parametricFunctionSources[i].Update();
                mappers.Add(vtkPolyDataMapper.New());
                mappers[i].SetInputConnection(parametricFunctionSources[i].GetOutputPort());

                actors.Add(vtkActor.New());
                actors[i].SetMapper(mappers[i]);

                textMappers.Add(vtkTextMapper.New());
                textMappers[i].SetInput(parametricObjects[i].GetClassName());
                textMappers[i].SetTextProperty(textProperty);

                textActors.Add(vtkActor2D.New());
                textActors[i].SetMapper(textMappers[i]);
                textActors[i].SetPosition(rendererSize / 2, 16);

                renderers.Add(vtkRenderer.New());
             }

             // Need a renderer even if there is no actor
             for(int i = parametricObjects.Count; i < gridDimensions * gridDimensions; i++) {
                renderers.Add(vtkRenderer.New());
             }

             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             renderWindow.SetSize(rendererSize * gridDimensions, rendererSize * gridDimensions);

             for(int row = 0; row < gridDimensions; row++) {
                for(int col = 0; col < gridDimensions; col++) {
                   int index = row * gridDimensions + col;

                   // (xmin, ymin, xmax, ymax)
                   double[] viewport = new double[] {
                      (col) * rendererSize / (double)(gridDimensions * rendererSize),
                      (gridDimensions - (row+1)) * rendererSize / (double)(gridDimensions * rendererSize),
                      (col+1)*rendererSize / (double)(gridDimensions * rendererSize),
                      (gridDimensions - row) * rendererSize / (double)(gridDimensions * rendererSize)};

                   //Debug.WriteLine(viewport[0] + " " + viewport[1] + " " + viewport[2] + " " + viewport[3]);
                   renderWindow.AddRenderer(renderers[index]);
                   IntPtr pViewport = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double)) * 4);
                   Marshal.Copy(viewport, 0, pViewport, 4);
                   renderers[index].SetViewport(pViewport);
                   Marshal.FreeHGlobal(pViewport);
                   if(index > parametricObjects.Count - 1)
                      continue;

                   renderers[index].AddActor(actors[index]);
                   renderers[index].AddActor(textActors[index]);
                   renderers[index].SetBackground(.2 + rnd.NextDouble() / 8, .3 + rnd.NextDouble() / 8, .4 + rnd.NextDouble() / 8);
                   renderers[index].ResetCamera();
                   renderers[index].GetActiveCamera().Azimuth(30);
                   renderers[index].GetActiveCamera().Elevation(-50);
                   renderers[index].GetActiveCamera().Pitch(-2);
                   renderers[index].ResetCameraClippingRange();
                }
             }
          }
       }
    }