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VB 2005 - image/graphics on user control

Posted on 2008-06-11
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Last Modified: 2012-05-05


I have a user control on which a bitmap image is painted using a graphics object (i.e. not a background image). I need to be able to capture a section of the bitmap in the mouse move event so as mouse moves, rectangle section (rct.x = e.x, rct.y = e.y, rct.width = 100, rct.height = 100) of the existing graphic is captured to an image object variable, and then transferred as the texture of a new brush object which is used to paint a copy of the defined section on a different area of the user control.

Any code examples of how to do this much appreciated...
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Question by:therealmongoose
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by:therealmongoose
ID: 21758528
Here's the code I need help with....
Imports System.Drawing
 

Public Class UserControl1
 

    Dim rectCopy As Rectangle

    Dim imgCopy As Image

    Dim bBrushCopy As TextureBrush

    Dim rctPaintTo As New Rectangle(5, 70, 50, 50)
 

    Sub drawrect()
 

        Dim rect As New Rectangle(5, 5, 300, 50)

        Dim bBrush As New TextureBrush(My.Resources.Image1)
 

        Using g As Graphics = Me.CreateGraphics
 

            g.FillRectangle(bBrush, rect)
 

        End Using
 

    End Sub
 

    Private Sub UserControl1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
 

        rectCopy.X = e.X

        rectCopy.Y = e.Y

        rectCopy.Width = 50

        rectCopy.Width = 50
 

        'capture screen section to imgCopy - size and location of rectCopy

        '=======================

        ' How do I copy a section of the screen to the image control?

        '

        imgCopy = ????

        '=======================
 

        bBrushCopy = New TextureBrush(imgCopy)
 

        Using g As Graphics = Me.CreateGraphics
 

            g.FillRectangle(bBrushCopy, rctPaintTo)
 

        End Using
 
 

    End Sub
 
 

    Private Sub UserControl1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
 

        drawrect()
 

    End Sub
 

End Class

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Accepted Solution

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Bruce_1975 earned 500 total points
ID: 21758797
Hi,
I'm a C# guy so you might have to translate the code...
Instead of directly drawing the image on the screen I used a PictureBox. To draw an image you have to use the Graphics.DrawImage() method instead of a filled rectangle.

Regards,
Bruce
private void Form1_MouseMove(object sender, MouseEventArgs e)

{

    // may have a global bitmap  and graphics

    // to improve performance

    Bitmap map = new Bitmap(50, 50);

    Graphics g = Graphics.FromImage(map);
 

    // get actual mouse point as screen location

    Point pt = this.PointToScreen(new Point(e.X, e.Y));

    // capure specific area from screen

    g.CopyFromScreen(pt.X, pt.Y, 0, 0, map.Size);

    // populate bitmap in picturebox

    pictureBox1.Image = map;

}

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Author Closing Comment

by:therealmongoose
ID: 31466102
Cool - thanks Bruce - just enough to let me solve it...

Dim pt As Point = Me.PointToScreen(New Point(e.X, e.Y))
(Point pt = this.PointToScreen(new Point(e.X, e.Y));)
 Was the bit I was missing - thanks for your time...          
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