Add Line Annotation onto C# Images

C# Image Text Annotation - Requirements & Preparation

• Microsoft Visual Studio 2005 or above / Visual Studio Express installed on your system
• .NET Framework 2.0 or later versions
• Download the .NET image SDK and unzip. Click on the exe file to run for installation.
• When installation is done, activate either your ordered license or the 30-day evaluation license.

Draw a C# Line Annotation on Images

• Now start your MS Visual Studio and click on your .NET image project to open.
• Click "Project" - "Add Reference..." to add the Yiigo.Image.UI.Annotation.dll to your reference.
• Copy the Visual C# sample code below to your project to create a line annotation on your image.

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

private void InitializeDefaultAnnotations()
{
// Draw a line annotation in your C#.NET project.
LineAnnotation lineAnnotation = new LineAnnotation ();
lineAnnotation.Name = "LineDemo1";

// Set the line color and outline width.
lineAnnotation.Width = 3;
lineAnnotation.Color = Color.Red;

// Specify the location of the line annotation.
lineAnnotation. StartPoint = (65, 20);
lineAnnotation. EndPoint = (155, 20);

annotationController1.CurrentLayer.Items.Add(lineAnnotation);
}

• Run your project and you can see that a horizontal line with the width of 3 pixels is drawn on your sample png image.
• For more settings such as line style and resizing options please view the property section below.

C# Image Text Annotation - Property Settings

• Type stands for the line annotation type. Default is solid. You can also select dotted lines, etc.
• StartPoint specifies the X and Y coordinates of the text annotation in the image/document space.
• EndPoint specifies the X and Y coordinates of the text annotation in the image/document space
• Resizable is a Boolean that represents whether developers can resize the line annotation, such as through the grips or a pinch-zoom gesture.
• Selectable is Boolean that defines whether the line annotation can be selected. If set to false, you cannot remove or resize the line annotation.
• Color is used to represent the line color. Users are able to manipulate it with the color name supported by the CSS color specification, or with RGB color value. Default is black [0, 0, 0]

C# Image Line Annotation - Sample Image

• Callout Annotation on images in C#
• Ellipse Annotation on images in C#
• HotSpot Annotation on Images using C#
• Polygon Annotation on Images using C#
• Freehand Annotation on Images in C#
• Rectangle Annotation on Images in C#
• Rubber Stamp Annotation on Images using C#
• Text Annotation on Images using C#