Extending ImageProcessor
Release 1.0 - ...
You can add custom developed (in Microsoft .NET) image commands to the ImageProcessor. To do this, first write a class module that implements the IImageCommand interface. The Execute method of the IImgCommand interface accepts a parameter of type ImageContext which contains all the information need to modify an image. Below is an example of a custom image command adding a watermark to each image processed by the image processor.
| C# |
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/// <summary>
/// A custom watermark image command
/// </summary>
public class WatermarkCommand
: ImageCommandBase
{
private Color foreColor = Color.White;
/// <summary>
/// Gets or sets the foreground color.
/// </summary>
/// <value>The color of the fore.</value>
public Color ForeColor
{
get { return this.foreColor; }
set { this.foreColor = value; }
}
/// <summary>
/// Executes this image command using specified context.
/// </summary>
/// <param name="context">The context.</param>
public override void Execute(ImageContext context)
{
using (Graphics g = context.GetGraphics()) {
string text = string.Format("Width: {0}\r\nHeight: {1}\r\nInput Type: {2}\r\nOutput Type: {3}\r\nCreated: {4}",
context.ImageSize.Width,
context.ImageSize.Height,
context.RequestContentType,
context.ResponseContentType,
DateTime.Now);
Font font = new Font("Verdana", 8, FontStyle.Bold);
g.DrawString(text, font, Brushes.Black, 6, 6);
g.DrawString(text, font, new SolidBrush(this.foreColor), 5, 5);
}
}
}
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| XML |
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<!-- custom watermark command --> <add type="Smartsite.ImageProcessor.TestApp.WatermarkCommand, Smartsite.ImageProcessor.TestApp" enabled="false"> <parameters> <add name="forecolor" shortcut="wfc"/> </parameters> </add> |
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