# ReadPNG

VTKExamples/CSharp/IO/ReadPNG

### Description

This example demonstrates how to read a PNG image file.
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

ReadPNG.cs

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

    using Kitware.VTK;

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

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

          private void ReadPNG() {
             // Path to vtk data must be set as an environment variable
             // VTK_DATA_ROOT = "C:\VTK\vtkdata-5.8.0"
             vtkTesting test = vtkTesting.New();
             string root = test.GetDataRoot();
             string filePath = System.IO.Path.Combine(root, @"Data\camscene.png");
             //Read the image
             vtkPNGReader reader = vtkPNGReader.New();
             if(reader.CanReadFile(filePath) == 0) {
                MessageBox.Show("Cannot read file \"" + filePath + "\"", "Error", MessageBoxButtons.OK);
                return;
             }
             reader.SetFileName(filePath);
             reader.Update();
             // Visualize
             vtkImageViewer2 imageViewer = vtkImageViewer2.New();
             imageViewer.SetInputConnection(reader.GetOutputPort());
             // get a reference to the renderwindow of our renderWindowControl1
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(0.2, 0.3, 0.4);
             imageViewer.SetRenderer(renderer);
          }
       }
    }