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How to shrink an image in VB.net - C #.net.

Author: Maliha Atteeq
Download Source Code : 1088_code.zip

In this simple article you will learn that how to shrink an image in vb and C #.net.

 Graphics:

While playing with the graphics you must keep the following point in your mind:

You can’t draw graphics on simple load event of the form. To create graphics on the form, you must override the onpaint() function of the form.

The syntax of the onpaint() function is:

C#:

protected override void OnPaint (PaintEventArgs e)

{

}

VB:

Dim e As PaintEventArgs

 

Me.OnPaint(e)

In this article I will tell you that how we can shrink an image.

Create a graphics and a rectangle object. Graphics class provides you a function named as FillRectangle(). This function has three overloaded methods depending on your requirements you can use any of them. The return type of this function is void.

The syntax of the FillRectangle() function is:

C#:

g.FillRectangle(texturedBGroundBrush, r);

VB:

g.FillRectangle(texturedBGroundBrush, r)

The next function is the drawImage(). This function has 29 overloaded methods,depending on your requirements you can use any of them. The return type of this function is void.

The syntax of the DrawImage() function is:

C#:

g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);

VB:

g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel)

To demonstrate make a new window application and write the following code on form’s onpaint event:

C#:

protected override void OnPaint(PaintEventArgs e)

        {

            Graphics g = e.Graphics;

            Bitmap bmp = new Bitmap("winter.jpg");

            g.FillRectangle(Brushes.White, this.ClientRectangle);

            Rectangle sr = new Rectangle(80, 60, 400, 400);

            Rectangle dr = new Rectangle(0, 0, 200, 200);

            g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel);

        }

                 

VB:

Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)

    Dim g As Graphics = e.Graphics

    Dim bmp As New Bitmap("winter.jpg")

    g.FillRectangle(Brushes.White, Me.ClientRectangle)

    Dim sr As New Rectangle(80, 60, 400, 400)

    Dim dr As New Rectangle(0, 0, 200, 200)

    g.DrawImage(bmp, dr, sr, GraphicsUnit.Pixel)

End Sub

Now write the following code on FORM LOAD event:

C#:

private void Form1_Load(object sender, EventArgs e)

        {

            this.Text = "DEVASP APPLICATION";

       }

Vb:

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)

    Me.Text = "DEVASP APPLICATION"

    End Sub 

This simple article tells that how to shrink an image in vb and C #.net.

   
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