Drawing Images in GDI+

The Graphics class also provide functionality for drawing images, using DrawImage and DrawImageUnscaled.DrawImage draws an Image object with a specifies size, and DrawImageUnscaled draws an Image object without scaling it. The DrawImage method has many overloaded forms.

An application creates Image object by calling the Image class's static FromFile method, which takes a file name as an argument. After that you create the coordinates of a rectangle in which to draw the image and call DrawImage. Listing 3.23 draws an image on the surface with a size of ClientRectangle.

LISTING 3.23: Drawing an image

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Public Class Form1
    Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        Try
            ' Create an image from a file
            Dim newImage As Image = Image.FromFile("dnWatcher.gif")

            ' Draw image
            e.Graphics.DrawImage(newImage, Me.ClientRectangle)
            newImage.Dispose()
        Catch ex As Exception

            MessageBox.Show(ex.Message.ToString())
        End Try
    End Sub
End Class

Figure 3.35 shows the output from Listing 3.23.



FIGURE 3.35: Drawing an image

Conclusion

Hope the article would have helped you in understanding drawing images in GDI+. Read other articles on GDI+ on the website.