How to Add Polygon Annotation on C# Image

C# Image Polygon Annotation - Requirements

• .NET 2.0 or above versions.
• .NET 2.0 or later versions.
• MS Visual Studio 2005 or above / VS Express.
• Visual C#.NET programming language

Annotate Polygon on C# Image - Getting Started

• Download the Yiigo image SDK library, and unzip the package to run the setup file.
• Activate your purchased license with your serial number. Or request an evaluation license and then activate it by following the wizard.

How to Draw a C# Polygon Annotation on Image

• Start your Visual Studio and open your C# image project.
• Add the annotation library to your project reference: Yiigo.Image.Annotation.dll.
• Copy the namespace and Visual C# sample code below to add a polygon annotation on your png image.
• Now you have successfully created a blue-backgrounded six-side Polygon with data text "Polygon" in it.
• You can also create a multi-side polygon annotation by left-clicking the mouse for each point, and then right clicking to stop editing.

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

PolygonAnnotation myAnnotation = new PolygonAnnotation();
myAnnotation.Text = "Polygon";
myAnnotation.Sides = 6;
myAnnotation.FillBackground = true;
myAnnotation.FillColor = new AnnotationBrush(Color.Blue);
myAnnotation.Width = 10;
myAnnotation.Location = new PointF(100, 100);
myAnnotation.Size = new SizeF(80, 80);
myAnnotation.Opacity = 1;
annotationController1.CurrentLayer.Items.Add(myAnnotation);

• To resize the annotation, change the sizing parameter in the C# code. Or in the viewer, select it by double clicking on it and then drag & release.
• If you want to edit the text, simply edit the data for the "Text" property in the C# example above.
• Those demonstrated above in the sample codes are just a few examples of polygon annotations for image in C#. To view more, check out the properties listed below.

Annotate Polygon on C# Image - Properties

• Color: Color for the polygon outline. You can customize it with RGB value or simply select form the user defined color palette. Default is [0, 0, 0] black.
• Width: The width for the polygon annotation outline. Default is 10 pixels.
• Sides: The attribute indicating how many sides for the polygon image. Default is 5.
• Fill Color: Color for the polygon image background. To set this color, you need to enable the Boolean property FillBackground to true beforehand. Default is [255, 255, 255] white.
• Fill Background: A Boolean value to indicate whether to fill the polygon image background with color or not.
• Opacity: Degree of transparency for the polygon image background color. Default is 1 meaning no transparency, i.e. no light passes through the image at all.

C# Image Polygon Annotation - Sample Image

• C# Tutorial to Add Callout Annotation on Image
• C# Tutorial to Add Ellipse Annotation on PNG Image
• C# Tutorial to Draw HotSpot Annotation on GIF Image
• C# Tutorial to Draw Freehand Annotation on TIFF
• C# Guide to Add Rectangle Annotation on JPEG
• C# Guide to Add Rubber Stamp Annotation on JPG
• C# Guide to Create Text Annotation on Image Files
• C# Guide to Create Line Annotation on Image Files