Visual C#.NET - Image Rectangle Annotation

C# Image Rectangle Annotation - Preparation

• Check that you have installed MS Visual Studio 2005 or above / VS Express.
• Download the Yiigo.Image for .NET SDK Library by clicking the online trial button.
• Unzip the package and run the exe file for software installation.
• Type in your license serial number to activate, or request an evaluation license and activate.

Draw a C# Rectangle Annotation on Image

• Start your Visual Studio and open your C#.NET imaging project.
• Add the annotation DLL to your project reference: Yiigo.Image.Annotation.dll.
• Copy the Visual C# sample code to your project to easily create a rectangle annotation onto your png image file.

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

// Draw a rectangle annotation first.
RectangleAnnotation myAnnotation = new RectangleAnnotation();
myAnnotation.Text = "Rectangle Annotation";

// Set the rectangle annotation fill, i.e. to the color blue.
myAnnotation.FillMode = true;
myAnnotation.BackgroundColor = new AnnotationBrush(Color.LightBlue);

// Adjust the rectangle outline width to 10 pixels.
myAnnotation.Width = 10;
myAnnotation.OutlineColor = (128, Color.Blue);

// Specify the X and Y coordinates of the lower left corner of the rectangle annotation.
myAnnotation. X = 30;
myAnnotation. Y = 30;

// Now set the size for the rectangle annotation, measured in pixel by default.
myAnnotation.Width = 200;
myAnnotation.Height = 100;

myAnnotation.Opacity = 1;
annotationController1.CurrentLayer.Items.Add(myAnnotation);

• Now you have successfully created a rectangle annotation sized 200 x 100 px on your png image, which has a non-transparent blue fill. Other formats supported include Jpeg/Jpg, Gif, Tiff images, and PDF, doc etc.
• Apart from the properties demonstrated in the Visual C# sample codes, you can also customize other rectangle annotation settings. Please check out the following property sections for more information.

C# Image Rectangle Annotation - Property Settings

• X is an int value, which sets the X coordinate for the lower left corner of the rectangle annotation to locate it.
• Y is an int value, which specifies the Y coordinate for the lower left corner of the rectangle annotation to locate it.
• Width is an int value to indicate rectangle image width, measured in pixel by default.
• Height is an int value to indicate rectangle image height, measured in pixel by default.
• Outline Color specifies the color for the rectangle outline, and the default is black [0, 0, 0]. You can customize it with RGB value or using the color palette.
• Background Color specifies the color for the rectangle fill/background, and the default is white [250, 250, 250]. Users can manipulate it with RGB value or the color palette directly. To use this property, you need to set the Fill Background property to true first.
• Fill Mode is a Boolean value indicating whether the rectangle background is filled or not.
• Line Style is the rectangle outline style, and it is Solid by default. You can select other styles such as solid line, dashed line, dotted line, dash dot line, etc.

C# Image Rectangle Annotation - Sample Image

• Visual C# Sample to Add Callout Annotation on Jpeg Image
• Visual C# Sample to Add Ellipse Annotation on Jpeg Image
• How to Draw HotSpot Annotation on Gif Image using C#
• How to Draw Polygon Annotation on Gif Image using C#
• C# Coding to Create Freehand Annotation on Png Image
• C# Coding to Create Rubber Stamp Annotation on Png Image
• How to Add Text Annotation on Image using C# Codes
• How to Add Line Annotation on Image using C# Codes