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Home Forums how to adjust the size of drawn rectangle at runtime – MindStick
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how to adjust the size of drawn rectangle at runtime

Madhu Mitha 2225 26 Mar 2015
hi,,


   it is possible to adjust the size of a rectangle which is drawn in a picturebox with drawrectangle function.. During run time i want to adjust my rectangle width using numericupdown control.. 


thank u
.net vb.net
Madhu Mitha
Ask by Madhu Mitha
Updated 01 Apr 2015

4 Answers

Madhu Mitha
Madhu Mitha 01 Apr 2015
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hai,,


       thank u it worked well...
Anonymous User
Anonymous User 30 Mar 2015 Accepted Answer
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According to my understanding about your problem scenario, you want to increase height and width according to the numericupdown control on click

Try this code:

Private Sub numericUpDown1_ValueChanged(sender As Object, e As EventArgs)
                Dim aa As Integer = Convert.ToInt32(numericUpDown1.Value.ToString())
                pictureBox1.Width = aa
                pictureBox1.Height = aa
End Sub

 Anonymous User

I hope it will work for u !! J

Madhu Mitha
Madhu Mitha 30 Mar 2015
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Hai..
Kamlakar Singh,

                I tried your code but what i needed is that... When i press my numeric updown control the width of my rectangle should be increased..

For Example..
if i created a rectangle with code
Dim width=50 
Dim height=25
Dim rect As New Rectangle(0, 0, width,height)
 g.DrawRectangle(Pens.Black, rect)
Now, When I press NumericUpDown control the width of my rectangle should be increased as 51,52 53, etc..
Is thr any possible way to do it..

Thank U

Anonymous User
Anonymous User 27 Mar 2015
Report Abuse
I have some code that might help you:

' Rectangle to draw

Private Rct As New Rectangle(0, 0, 0, 0)
Private offsetX As Integer = 0
Private offsetY As Integer = 0 
Sub Main() Handles MyBase.Load 
    ' Some image to
use
   
MiniPictureBox.Image = My.Resources.P6130003
   
MainPictureBox.Image = My.Resources.P6130003 
End Sub 
Private Sub MiniPictureBoMouseDown(sender As Object, e As
MouseEventArgs) Handles MiniPictureBox.MouseDown 
    If e.Button =
Windows.Forms.MouseButtons.Left Then 
        If Not
Rct.Contains(e.Location) Then
            ' New
rectangle
           
Rct.Location = New Point(e.X, e.Y)
        Else
            ' Moving a
rectangle
            offsetX =
Rct.X - e.X
            offsetY =
Rct.Y - e.Y
        End If 
    ElseIf e.Button =
Windows.Forms.MouseButtons.Right Then 
        ' Clears the
screen of a rectangle
        Rct = New
Rectangle(0, 0, 0, 0)
       
MiniPictureBox.Invalidate() 
    End If 
End Sub 
Private Sub MiniPictureBoMouseMove(sender As Object, e As
MouseEventArgs) Handles MiniPictureBox.MouseMove 
    ' Event handler to
update the picture of the rectangle
    If e.Button =
Windows.Forms.MouseButtons.Left Then 
        If
Rct.Contains(e.Location) Then
            ' Move the
box
            Rct.X =
e.X + offsetX
            Rct.Y =
e.Y + offsetY
           
MainPictureBox.Invalidate()
        Else
            ' Update
the size of the box
            Rct.Width
= e.X - Rct.X
            Rct.Height
= e.Y - Rct.Y
        End If 
       
MiniPictureBox.Invalidate() 
    End If  
End Sub 
Private Sub MiniPictureBoMouseUp(sender As Object, e As
MouseEventArgs) Handles MiniPictureBox.MouseUp 
    ' Event handler to
call the paint event for runtime display
   
MiniPictureBox.Invalidate()
   
MainPictureBox.Invalidate() 
End Sub 
Private Sub MiniPictureBoPaint(sender As Object, e As
PaintEventArgs) Handles MiniPictureBox.Paint 
    Dim myPen As Pen =
New Pen(Brushes.Red, 2)
   
e.Graphics.DrawRectangle(myPen, Rct) 
End Sub 
Private Sub MainPictureBoPaint(sender As Object, e As
PaintEventArgs) Handles MainPictureBox.Paint 
    If Rct.Width >
0 Then
        Dim biggerRec
As Rectangle = CalculateRectangle(MainPictureBox) 
        Dim myPen As
Pen = New Pen(Brushes.Red, 2)
       
e.Graphics.DrawRectangle(myPen, biggerRec)
    End If 
End Sub 
Private Function CalculateRectangle(currentPicture As
PictureBox) As Rectangle 
    Try
        Dim newWidth
As Integer = (Rct.Width / MiniPictureBox.Width) * currentPicture.Image.Width
        Dim newHeight
As Integer = (Rct.Height / MiniPictureBox.Height) * currentPicture.Image.Height
        Dim newX As
Integer = (Rct.X / MiniPictureBox.Width) * currentPicture.Image.Width
        Dim newY As
Integer = (Rct.Y / MiniPictureBox.Height) * currentPicture.Image.Height
        Return New
Rectangle(newX, newY, newWidth, newHeight)
    Catch ex As
Exception
       
MessageBox.Show(ex.Message + Environment.NewLine + Environment.NewLine +
ex.StackTrace)
    End Try 
End Function


This code will allow you to create, move, and clear a rectangle. One point of caution is in the calculations for changing the size of the rectangle, you have to ensure exception handling is properly inserted for any arithmetic exceptions.

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