Handling Picture Box Events (and Creating Image Maps)

The New Products Department is on the phone; they want you to design a program to welcome new employees to the company. The program should display a picture of the main plant, and when the new employee clicks part of that image, "it should sort of zoom in on it." Can you do that in Visual Basic?

You can if you handle mouse events for the picture box and respond accordingly. For example, the PictureBoxes example on the CD-ROM handles MouseDown events by displaying the location where the mouse went down in a text box:

Private Sub PictureBox1_MouseDown(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.MouseEventArgs) Handles _
    PictureBox1.MouseDown
    TextBox1.Text = "You clicked at " & e.X & ", " & e.Y
End Sub

You can see the results of this code in Figure 7.18, where I've clicked the picture box.

Figure 7.18: Creating an image map with a picture box.