Visual C#.NET - Image Freehand Annotation

C# Image Freehand Annotation - Requirements

• You have installed MS Visual Studio 2005 or above / MS Visual Studio Express.
• You are using .NET 2.0 or later versions.
• You are using Visual C#.NET or Visual Basic.NET as your programming language.

C# Image Freehand Annotation - Getting Started

• Download Yiigo.Image for .NET library SDK online.
• Install this C# imaging control by running the exe file from the unzipped download package.
• Type in the serial number for the purchased license to activate it. If you are simply evaluating the software, please request a free 30-day evaluation license first and then follow the wizard to activate the it.

How to Draw a C# Freehand Annotation on Image

• Start up your Microsoft Visual Studio and open your Visual C#.NET imaging project.
• Add the Yiigo annotation library named Yiigo.Image.Annotation.dll to your project reference.
• Enable the Yiigo.Image.Annotation namespace in your project, and copy the C# sample code to your imaging project. Sample image is in png image format.
• Now you can draw the freehand annotation on an image / document. Users only need to press the mouse button down, dragging (in the way you want to shape the annotation), and releasing the button.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using Yiigo.Image.Annotation;

namespace Yiigo.Imaging.Annotation
{
    public class FreehandLineAnnotation
    { 
        public static void Test()
        {
            try
            {
               // Draw a new freehand line with annotation dll.            
                FreeHandLineAnnotation object = new FreeHandLineAnnotation();
                //set Track points
                object.Points = new List<LinePoint>();
                object.Points.Add(new LinePoint(18.0F, 24.0F));
                object.Points.Add(new LinePoint(20.3F, 1255.0F));
                object.Points.Add(new LinePoint(78.0F, 144.0F));

                // Adjust freehand annotation outline width
                object.LinePen = new LinePen();
                object.LinePen.Width = 20.0F;

                //set freehand annotation outline property like line style and color,
                object.LinePen.Brush = new AnnotationBrush();
                object.LinePen.Brush.FillType = Yiigo.Imaging.Annotation.FillType.Solid;
                object.LinePen.Brush.Solid_Color = Color.Blue; 

                // Set the Closed loop property (style and color) as below if the track has Closed loop.
                object.Fill = new AnnotationBrush();
                object.Fill.FillType = Yiigo.Imaging.Annotation.FillType.Solid;; 
                object.Fill.Solid_Color = Color.Blue; 

                string folderName = "C:/";
                Bitmap img = object.CreateAnnotation();
                img.Save(folderName + "YiigoFreehandLineAnnotation.png");
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
            }
        }
    }
}

• More image formats are supported like jpeg, gif, tiff, etc. You can also adjust annotation settings, such as flipping, rotating, resizing, text editing, etc.
• With freehand annotation you can draw annotation in sophisticated shape and also write any comment you want.
• When done, each freehand annotation can be independently resized, edited, repositioned, rotated, added to different groups, saved to system, or burned into image & documents.

C# Image Ellipse Annotation - Settings & Parameters

• Color. Color specifies the color for the freehand annotation. Default is purple.
• Width. Width specified the width for the freehand annotation. Default is 10 pixels.

C# Image Ellipse Annotation - Sample Image

Freehand Annotation Sample1 - Highlighter

Freehand Annotation Sample2 - Custom Line & Writing

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