Gavin Gear's Tech Blog

//

// Basic Ink enabled Windows Forms application with

// handwriting recognition using InkAnalyzer

// Gavin Gear - http://blogs.msdn.com/gavingear

// 09/2006

//

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using Microsoft.Ink; // The managed Tablet PC API

namespace BasicInkApplication

{

    public partial class BasicInkApplication : Form

    {

        // The InkOverlay that we'll attach to our Form

        private InkOverlay inkOverlay;

        private InkAnalyzer inkAnalyzer;

        public BasicInkApplication()

        {

            InitializeComponent();

            // Create an InkOverlay object that's attached to the Form

            this.inkOverlay = new InkOverlay(this);

            // Enable the InkOverlay (default is Enabled == false)

            this.inkOverlay.Enabled = true;

            this.inkOverlay.Stroke += new InkCollectorStrokeEventHandler(inkOverlay_Stroke);

            // Create a new InkAnalyzer

            // - Associate with the InkOverlay's Ink object

            // - Send the Form "this" as the synchronizing object

            this.inkAnalyzer = new InkAnalyzer(this.inkOverlay.Ink, this);

            // Hook up to the InkAnalyzer.ResultsUpdated event

            // in order to be notified when BackgroundAnalyze() finishes

            this.inkAnalyzer.ResultsUpdated += new                

                         ResultsUpdatedEventHandler(inkAnalyzer_ResultsUpdated);

            // The InkOverlay needs to be disposed due to unmanaged resources

            // used by the InkOverlay

            this.FormClosing += new FormClosingEventHandler(BasicInkApplication_FormClosing);

        }

        void inkOverlay_Stroke(object sender, InkCollectorStrokeEventArgs e)

        {

            // We have a new stroke, add it to the InkAnalyzer

            this.inkAnalyzer.AddStroke(e.Stroke);

        }

        void BasicInkApplication_FormClosing(object sender, FormClosingEventArgs e)

        {

            this.inkOverlay.Dispose();

            this.inkAnalyzer.Dispose(); // Free the unmanaged resources

        }

        private void buttonRecognize_Click(object sender, EventArgs e)

        {

            // Kick off asynchronous analysis

            this.inkAnalyzer.BackgroundAnalyze();

        }

        void inkAnalyzer_ResultsUpdated(object sender, ResultsUpdatedEventArgs e)

        {

            // Build up a summary of the parsing structure

            // this is essentially a hierarchical collection

            // of elements called ContextNodes which can represent things

            // like Drawings, Paragraphs, Lines, Words, and even relationships

            // (ContextLinks) like connectors, containers, etc

            // In this case, we'll keep things simple by just showing the user drawings

            // and words

            ContextNodeCollection words =

                         this.inkAnalyzer.FindNodesOfType(ContextNodeType.InkWord);

            ContextNodeCollection drawings =

                         this.inkAnalyzer.FindNodesOfType(ContextNodeType.InkDrawing);

            string summary = "Words:" + Environment.NewLine;

            foreach (InkWordNode node in words)

            {

                summary += "\t" + node.GetRecognizedString() + Environment.NewLine;

            }

            summary += Environment.NewLine + "Drawings:" + Environment.NewLine;

            foreach (InkDrawingNode node in drawings)

            {

                summary += "\t" + node.GetShapeName() + Environment.NewLine;

            }

            MessageBox.Show(summary, "Parsing Results");

        }

    }

}