# GeometricObjectsDemo

VTKExamples/CSharp/GeometricObjects/GeometricObjectsDemo

### 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

GeometricObjectsDemo.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 {
                GeometricObjectsDemo();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void GeometricObjectsDemo() {
             // we create a matrix of 3x3 renderer in our renderwindow
             // each renderer can be interacted with independently from one another
             int rendererSize = 234; // width per renderer
             int gridDimensions = 3;
             this.Size = new System.Drawing.Size(756, 756);
             Random rnd = new Random(2); // for background color variation

             List<vtkPolyDataAlgorithm>  geometricObjectSources = new List<vtkPolyDataAlgorithm>();
             geometricObjectSources.Add(vtkArrowSource.New());
             geometricObjectSources.Add(vtkConeSource.New());
             geometricObjectSources.Add(vtkCubeSource.New());
             geometricObjectSources.Add(vtkCylinderSource.New());
             geometricObjectSources.Add(vtkDiskSource.New());
             geometricObjectSources.Add(vtkLineSource.New());
             geometricObjectSources.Add(vtkRegularPolygonSource.New());
             geometricObjectSources.Add(vtkSphereSource.New());
             geometricObjectSources.Add(vtkEarthSource.New());

             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(18);
             textProperty.SetJustificationToCentered();

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

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

                textMappers.Add(vtkTextMapper.New());
                textMappers[i].SetInput(geometricObjectSources[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 = geometricObjectSources.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 > geometricObjectSources.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);
                }
             }
          }
       }
    }