First we learn
that how to implement these functionality in image one by one. so first we need
to learn that how to show an image in windows form? for this we can take a
picturebox control, picturebox control able to load an image file format like
bmp,gpeg,gif,tiff file also.
So let start with
our first step.
Start a new windows application and add
one splitcontainer, picturebox, menustrip, toolstrip on windows form.
Arrange controls on the form like this.
Now we need to open image on the form so we
use open filedialog class for selecting image file.
Code
File
Private
Img As Image
Declare Img as object of Image class. Image class is the
member of System.Drawing namespace, it is abstrat base class that provides
functionality for raster images(bitmaps) and vector images(Metafile) descended
classes.
use openfiledialog on OpenToolStripMenuItem_Click event
Private
Sub OpenToolStripMenuItem_Click(ByVal
sender As System.Object,
ByVal e As
System.EventArgs) Handles
OpenToolStripMenuItem.Click
Dim
Dlg As New
OpenFileDialog
Dlg.Filter
= ""
Dlg.Title =
"Select image"
If
Dlg.ShowDialog = Windows.Forms.DialogResult.OK Then
Img =
Image.FromFile(Dlg.FileName)
'Image.FromFile(String)
method creates an image from the specifed file, here dlg.Filename contains the
name of the file from which to create the image
LoadImage()
End
If
End
Sub
Private
Sub LoadImage()
'we set the
picturebox size according to image, we can get image width and height with the
help of Image.Width and Image.height properties.
Dim
imgWidth As Integer
= Img.Width
Dim
imghieght As
Integer = Img.Height
PictureBox1.Width = imgWidth
PictureBox1.Height = imghieght
PictureBox1.Image = Img
PictureBoxLocation()
End
Sub
Suppose that your picturebox or image size is smaller than
background panel than image will show in the corner of the panel in upperside
and this is not professional look of showing image so we set the picturebox or
image center location on panel.
After doing this image will always show in center of panel
Private
Sub PictureBoxLocation()
Dim
_x As Integer
= 0
Dim
_y As Integer
= 0
If
SplitContainer1.Panel1.Width > PictureBox1.Width Then
_x =
(SplitContainer1.Panel1.Width - PictureBox1.Width) \ 2
End
If
If
SplitContainer1.Panel1.Height > PictureBox1.Height
Then
_y =
(SplitContainer1.Panel1.Height - PictureBox1.Height) \ 2
End
If
PictureBox1.Location = New Point(_x, _y)
End
Sub
Private
Sub SplitContainer1_Panel1_Resize(ByVal
sender As System.Object,
ByVal e As
System.EventArgs) Handles
SplitContainer1.Panel1.Resize
PictureBoxLocation()
End
Sub
You can try this code for making image editing tool,in
this article you learn that how to show image on form, in next article of this
series describe to Resize image....thanks