Visual Basic

Re: the fast ways to create a list

11-Dec-18 4:36

Hello !
Is there any fast way to create a list of obj1(Integer,string) , where the first field is an integer from 1-2000 , and the second field is the same string. , so the list should be : (1,"a") , (2,"a"),(3,"a")........(2000,"a").

I know that with a for loop can I create this , but i'm asking if there's a more fast way.

Thank you !

Richard Deeming11-Dec-18 5:30

Richard Deeming

11-Dec-18 5:30

Depends what you mean by "fast". Smile | :)

If you mean you want to save on typing, then try LINQ:

VB.NET

Dim myList As List(Of obj1) = Enumerable.Range(1, 2000).Select(Function(i) New obj1(i, "a")).ToList()

If you want the code to execute faster, then a For loop is probably your best bet. If you know the size of the list, then make sure you specify the initial capacity, to avoid having to reallocate the internal storage over and over again.
List<T>.Capacity Property (System.Collections.Generic) | Microsoft Docs[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: the fast ways to create a list

desanti11-Dec-18 5:40

Re: the fast ways to create a list

11-Dec-18 5:40

for loop is faster than Linq ?
In other occasions , the for loop was very slower than Linq

Eddy Vluggen11-Dec-18 6:39

Fill Treeview using recursion

11-Dec-18 6:39

desanti wrote:
In other occasions , the for loop was very slower than Linq

Measured by you on a timer?

One is a simple loop, the other a call to an interface to return an object on each iteration. Which of the two do you think would be faster?

Also, instead of having a list, this would probably be done faster by casting the int to a string when you need it, instead of having it in memory in a non-array.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

sterenas7-Dec-18 10:15

7-Dec-18 10:15

Hi,
Wonder if there's a better approach to fill a Treeview recursively. Following snippet fills the Treeview but if I need an extra level I'd have to create yet another Sub. There must be a way of doing it recursively? Also I'm not able to show CategoryName on every node (please see tree representations below):

IdCategory	CategoryName	ParentCategory
15		Uncategorized	0
50		Animals		0
51		Plants		0
52		Dogs		50
53		Small		52
54		Medium		52
55		Large		52
56		Trees		51
57		Flowers		51
58		White		55
59		Brown		55

I call FillRootLevel and get the following:

0
  Animals
  Plants
  Uncategorized
50
  Dogs
51
  Flowers
  Trees
52
  Large
  Medium
  Small
55
  Brown
  White

Private Sub FillRootLevel()
   tvCategories.Nodes.Clear()
   dtCategories = obj.ListCategories().Tables("Data")
   For Each dr As DataRow In dtCategories.Rows
       Dim node As New TreeNode With {
           .Text = dr("IdCategory"),
           .Tag = dr("CategoryName")
       }
       tvCategories.Nodes.Add(node)
       FillParentCategories(node.Tag, node)
    Next
End Sub

Private Sub FillParentCategories(ByVal strNodeTag As String, ByVal parentnode As TreeNode)
   dtParentCategories = obj.ListParentCompanies().Tables("Data")
   For Each dr As DataRow In dtParentCategories.Rows
       Dim node As New TreeNode With {
           .Text = dr("ParentCategory"),
           .Tag = dr("ParentCategory")
       }
       parentnode.Nodes.Add(node)
       FillCategories(node.Tag, node)
    Next
End Sub

Private Sub FillCategories(ByVal strParentCategory As String, ByVal parentnode As TreeNode)
    dtCategories = obj.ListCategories(strParentCategory).Tables("Datos")
    For Each dr As DataRow In dtCategories.Rows
        Dim node As New TreeNode With {
            .Text = dr("CategoryName"),
            .Tag = dr("CategoryName")
        }
        parentnode.Nodes.Add(node)
    Next
End Sub

I'd need:

Uncategorized
Animals
  Dogs
    Large
      Brown
      White
    Medium
    Small
Plants
   Flowers
   Trees

Searched quite a bit for a solution but couldn't find a VB.NET / C# acceptable one.
Thanks for any help you may provide!
Sergio

modified 7-Dec-18 18:33pm.

Eddy Vluggen8-Dec-18 0:12

8-Dec-18 0:12

When you create a node, name it using the value of "IdCategory". When reading the next item, take parentId, and search the entire treeview for a node that has that name as its Id. (FindNode or similar would do, without having to use recursion).

If it exists, add the current item as a child to that node.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Eddy Vluggen8-Dec-18 1:46

8-Dec-18 1:46

Something like below would work Smile | :)

Public Class Form1

    Public Class Thingy
        Sub New(id As Long, catName As String, parentId As Long)
            IdCategory = id
            CategoryName = catName
            ParentCategory = parentId
        End Sub
        Public IdCategory As Long
        Public CategoryName As String
        Public ParentCategory As Long
    End Class

    Sub New()

        ' This call is required by the designer. Without it, designer will be sad.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        Dim data As List(Of Thingy) = New List(Of Thingy)
        data.Add(New Thingy(15, "Uncategorized", 0))
        data.Add(New Thingy(50, "Animals", 0))
        data.Add(New Thingy(51, "Plants", 0))
        data.Add(New Thingy(52, "Dogs", 50))
        data.Add(New Thingy(53, "Small", 52))
        data.Add(New Thingy(54, "Medium", 52))
        data.Add(New Thingy(55, "Large", 52))
        data.Add(New Thingy(56, "Trees", 51))
        data.Add(New Thingy(57, "Flowers", 51))
        data.Add(New Thingy(58, "White", 55))
        data.Add(New Thingy(59, "Brown", 55))

        Dim tv As New TreeView
        tv.Dock = DockStyle.Fill
        Me.Controls.Add(tv)

        For Each item As Thingy In data
            Dim possibleParent As TreeNode() = tv.Nodes.Find(item.ParentCategory, searchAllChildren:=True)
            If possibleParent.Count = 0 Then
                tv.Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
            Else
                possibleParent.First().Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
            End If
        Next

    End Sub

End Class

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

sterenas8-Dec-18 4:26

8-Dec-18 4:26

Thanks so much Eddy, looks a lot easier that I would ever thought of. Great answer.
Regards,
Sergio

Eddy Vluggen8-Dec-18 4:37

8-Dec-18 4:37

Thank you for making me a bit happier, and you're welcome Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

sterenas10-Dec-18 3:52

10-Dec-18 3:52

Hi Eddie,
Realized I need to add an extra level to the tree. Changed your code to add the ShopName to the list of Thingy. Did a For Each to add all shop names to the tree as a first stage (there's only a max of 10 anyway).
I then tried to first filter the tree by ShopName to then add the nodes according to your code, but I can't seem to figure it out. I think possibleParent tv.Nodes.Find is not taking into account my possibleShop tv.nodes.find ?
Would you have any suggestions on this one ?
Dank U Wel Smile | :)

Dim data As List(Of Thingy) = New List(Of Thingy) From {
    New Thingy("SHOP 1", 15, "Uncategorized", 0),
    New Thingy("SHOP 1", 50, "Animals", 0),
    New Thingy("SHOP 1", 51, "Plants", 0),
    New Thingy("SHOP 1", 52, "Dogs", 50),
    New Thingy("SHOP 1", 53, "Small", 52),
    New Thingy("SHOP 1", 54, "Medium", 52),
    New Thingy("SHOP 1", 55, "Large", 52),
    New Thingy("SHOP 1", 56, "Trees", 51),
    New Thingy("SHOP 1", 57, "Flowers", 51),
    New Thingy("SHOP 1", 58, "White", 55),
    New Thingy("SHOP 1", 59, "Brown", 55),
    New Thingy("SHOP 2", 15, "Uncategorized", 0),
    New Thingy("SHOP 2", 50, "Animals", 0),
    New Thingy("SHOP 2", 51, "Plants", 0),
    New Thingy("SHOP 2", 52, "Dogs", 50),
    New Thingy("SHOP 2", 53, "Small", 52),
    New Thingy("SHOP 2", 54, "Medium", 52),
    New Thingy("SHOP 2", 55, "Large", 52),
    New Thingy("SHOP 2", 56, "Trees", 51),
    New Thingy("SHOP 2", 57, "Flowers", 51),
    New Thingy("SHOP 2", 58, "White", 55),
    New Thingy("SHOP 2", 59, "Brown", 55)
}

' Add all shops to the tree
For Each item As Thingy In data
    Dim possibleShop As TreeNode() = tv.Nodes.Find(item.ShopName, searchAllChildren:=True)
    If possibleShop.Count = 0 Then
        tv.Nodes.Add(key:=item.ShopName, text:=item.ShopName)
    End If
Next

For Each item As Thingy In data
    Dim possibleShop As TreeNode() = tv.Nodes.Find(item.ShopName, searchAllChildren:=True)
    If possibleShop.Count > 0 Then
        Dim possibleParent As TreeNode() = tv.Nodes.Find(item.ParentCategory, searchAllChildren:=True)
        If possibleParent.Count = 0 Then
            tv.Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
        Else
            possibleParent.First().Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
        End If
    End If
Next

Eddy Vluggen11-Dec-18 2:08

11-Dec-18 2:08

You could add a level without changing the code; all that needs changing is the data (assuming you are still reading it from a DB as a table, instead of a hard-coded list I'm using for explanation)

Dim data As List(Of Thingy) = New List(Of Thingy)
data.Add(New Thingy(1, "Shop 1", 0))
data.Add(New Thingy(2, "Shop 2", 0))

data.Add(New Thingy(11, "Uncategorized", 1)) ' both shops have uncategorized items
data.Add(New Thingy(21, "Uncategorized", 2))

data.Add(New Thingy(12, "Animals", 1))
data.Add(New Thingy(22, "Animals", 2))

data.Add(New Thingy(13, "Plants", 1))
data.Add(New Thingy(23, "Plants", 2))

data.Add(New Thingy(222, "Dogs", 22)) ' only shop 2 has dogs
data.Add(New Thingy(2221, "Small", 222))
data.Add(New Thingy(2222, "Medium", 222))
data.Add(New Thingy(2223, "Large", 222))

data.Add(New Thingy(131, "Trees", 13)) 'only shop 1 has trees
data.Add(New Thingy(132, "Flowers", 13))
data.Add(New Thingy(1321, "White", 132))
data.Add(New Thingy(1322, "Brown", 132))

data.Add(New Thingy(232, "Flowers", 23)) ' flowers for shop 2
data.Add(New Thingy(2321, "White", 232))
data.Add(New Thingy(2322, "Brown", 232))

If you want to add another level, just give it a new number and decide who is going to be the parent-item.

For example, if the White flowers would be divided into thorny and non-thorny, we'd add numbers similar to below;

data.Add(New Thingy(23211, "Thorny", 2321))
data.Add(New Thingy(23212, "Non-thorny", 2321))

Graag gedaan Smile | :)

PS: you don't have to use the numbering-scheme like I did - as long as each item in the tree has a unique number, everything should work. So, numbering them 1,2,3,4,5 etc doesn't change it. Feel free to use a more friendly numbering Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

sterenas11-Dec-18 5:34

11-Dec-18 5:34

Hey Eddie,
You actually didn't add another level to the data. I have 4 elements:

New Thingy("SHOP 1", 55, "Large", 52)

We're pretty close with the code below but there must be something wrong with the statement after the only ELSE. I'm getting:

Shops
---Shop1
------Uncategorized
------Animals
------Plants
...
---Shop2
------Uncategorized
------Animals
------Plants
...

ie it's not taking into account the parent categories to show them right.  About to give up on this treeview and use a datagridview which is far simpler to understand :(

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
       Dim data As List(Of Thingy) = New List(Of Thingy) From {
           New Thingy("SHOP 1", 15, "Uncategorized", 0),
           New Thingy("SHOP 1", 50, "Animals", 0),
           New Thingy("SHOP 1", 51, "Plants", 0),
           New Thingy("SHOP 1", 52, "Dogs", 50),
           New Thingy("SHOP 1", 53, "Small", 52),
           New Thingy("SHOP 1", 54, "Medium", 52),
           New Thingy("SHOP 1", 55, "Large", 52),
           New Thingy("SHOP 1", 56, "Trees", 51),
           New Thingy("SHOP 1", 57, "Flowers", 51),
           New Thingy("SHOP 1", 58, "White", 55),
           New Thingy("SHOP 1", 59, "Brown", 55),
           New Thingy("SHOP 2", 15, "Uncategorized", 0),
           New Thingy("SHOP 2", 50, "Animals", 0),
           New Thingy("SHOP 2", 51, "Plants", 0),
           New Thingy("SHOP 2", 52, "Dogs", 50),
           New Thingy("SHOP 2", 53, "Small", 52),
           New Thingy("SHOP 2", 54, "Medium", 52),
           New Thingy("SHOP 2", 55, "Large", 52),
           New Thingy("SHOP 2", 56, "Trees", 51),
           New Thingy("SHOP 2", 57, "Flowers", 51),
           New Thingy("SHOP 2", 58, "White", 55),
           New Thingy("SHOP 2", 59, "Brown", 55)
       }

       ' Add all shops to the tree
       tv.Nodes.Add("Shops", "Shops")

       For Each item As Thingy In data
           Dim possibleRoot As TreeNode() = tv.Nodes.Find(item.ShopName, searchAllChildren:=True)
           If possibleRoot.Count = 0 Then
               tv.Nodes(0).Nodes.Add(key:=item.ShopName, text:=item.ShopName)
           End If
       Next

       For Each item As Thingy In data
           Dim possibleParent As TreeNode() = tv.Nodes.Find(item.ShopName, searchAllChildren:=True)
           If possibleParent.Count = 0 Then
               ' It'll never go this way as I've added all the shops ahead of time
               tv.Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
           Else
               possibleParent.First().Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
           End If
       Next
       tv.ExpandAll()
   End Sub

And the class is now:

Public Class Thingy
    Sub New(ShpName As String, id As Long, catName As String, parentId As Long)
        ShopName = ShpName
        IdCategory = id
        CategoryName = catName
        ParentCategory = parentId
    End Sub
    Public Property ShopName As String
    Public Property IdCategory As Long
    Public Property CategoryName As String
    Public Property ParentCategory As Long

End Class

Ik zit vast met deze boom. Heel erg bedankt voor al je hulp Smile | :)

Sergio

Eddy Vluggen11-Dec-18 6:16

11-Dec-18 6:16

sterenas wrote:
You actually didn't add another level to the data.

AFAIK, I did; using the same code, we can also easily add the rootlevel called "shops", if you want the tree to start there. Simply take the code with the changes I proposed, and add the code below;

Dim data As List(Of Thingy) = New List(Of Thingy)

data.Add(New Thingy(99999, "Shops", 0))
data.Add(New Thingy(1, "Shop 1", 99999))
data.Add(New Thingy(2, "Shop 2", 99999))
'  .. rest of the list remains the same

The tree will then have a single branch called shops, with a list of shops under that node, and categories of stuff to sell within that. I used a higher number for the lowest level to show that the numbers are only used to "link" the nodes together - the number in itself is meaningless.

sterenas wrote:
Public Class Thingy

I've used the thingy-class as a placeholder for the data; they're just nodes. When adding a level, all we need is three things:
* the Id of the node (what the treenode is called)
* the Id of the node that we're going display this one in (the parent node)
* a name to display (which does not have to be limited to categories)

If any node is clicked, you can traverse the tree to see which shop it belongs to.

sterenas wrote:
About to give up on this treeview and use a datagridview which is far simpler to understand

The choice between TreeView and GridView is determined by the data; if it is a tree, you use a tree, if it is a grid, you use the gridview. We don't do grids in trees or trees in grids, because that becomes complicated quickly.

Complicated code is frustrating, which leads to anger, which leads to the dark side.

sterenas wrote:
Ik zit vast met deze boom. Heel erg bedankt voor al je hulp

No problem, we all been stuck at some point Thumbs Up | :thumbsup:

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

sterenas11-Dec-18 7:51

11-Dec-18 7:51

Great explanation Eddie, you nailed it! Enclosing the working code just in case someone else is as stuck as I was. You only need to add a treeview named tv to Form1.
Again thanks so much for your time and help and Heb een geweldige dag in zo'n mooi land.
Sergio

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim data As List(Of Thingy) = New List(Of Thingy) From {
            New Thingy(99999, "Shops", 0),
            New Thingy(1, "Shop 1", 99999),
            New Thingy(2, "Shop 2", 99999),
            New Thingy(15, "Uncategorized", 1),
            New Thingy(15, "Uncategorized", 2),
            New Thingy(50, "Animals", 1),
            New Thingy(51, "Plants", 1),
            New Thingy(52, "Dogs", 50),
            New Thingy(53, "Small", 52),
            New Thingy(54, "Medium", 52),
            New Thingy(55, "Large", 52),
            New Thingy(56, "Trees", 51),
            New Thingy(57, "Flowers", 51),
            New Thingy(58, "White", 55),
            New Thingy(59, "Brown", 55)
        }

        For Each item As Thingy In data
            Dim possibleParent As TreeNode() = tv.Nodes.Find(item.ParentCategory, searchAllChildren:=True)
            If possibleParent.Count = 0 Then
                tv.Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
            Else
                possibleParent.First().Nodes.Add(key:=item.IdCategory, text:=item.CategoryName)
            End If
        Next
        tv.ExpandAll()
    End Sub
End Class

Public Class Thingy
    Sub New(id As Long, catName As String, parentId As Long)
        IdCategory = id
        CategoryName = catName
        ParentCategory = parentId
    End Sub
    Public IdCategory As Long
    Public CategoryName As String
    Public ParentCategory As Long
End Class

Eddy Vluggen11-Dec-18 23:10

entity framework Group by multiple columns and count the number of groups with more than 1 item

11-Dec-18 23:10

Thanks; btw, you might consider giving the thingy a better name Laugh | :laugh:

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

desanti6-Dec-18 11:24

Re: entity framework Group by multiple columns and count the number of groups with more than 1 item

6-Dec-18 11:24

Hello !
I'm using Entity Framework 6
I have Myobject1 : Name , City , Price, Value
I want to group all the items on groups that have the same Name , city and Price.
After I want to count the groups that have more than 1 item.
I'm using this code :

Dim q As Integer = context.myobjects.GroupBy(Function(x) New With {x.Name,x.City,x.Price}).Where(Function(t3) t3.Count > 1).Count

But this query always return 0
But on my table I have several groups that have more than 1 item.
What is wrong with my query ?
Thank you !

Richard Deeming7-Dec-18 7:46

Richard Deeming

7-Dec-18 7:46

That code looks like it should work. Are you sure you're connecting to the right database?

What happens if you run the generated query directly within SQL? You can see the query with:

Dim query As String = context.myobjects.GroupBy(Function(x) New With {x.Name,x.City,x.Price}).Where(Function(t3) t3.Count > 1).ToString()

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Problems with Entity Famework and bindingsources

desanti6-Dec-18 0:13

Drawlines is correct or not ?

6-Dec-18 0:13

Hello !
i'm using vb.net 2017 with EF 6
I have 2 tables on my database : Product and ProductDetail
I have also 2 bindingsource Productbindingsource and ProductDetailsbindingsource.
I have also 2 datagridview each of them bound to the respective bindingsource.
When the user select a product in the first datagridview , the other datagridview is filled with Productdetails for the selected product.
I have this code :

Private sub Fill_Product
context.Products.Where(Function(t2) t2.cl>5).Load
ProductBindingsource.datasource=context.Products.Local.ToBindinglist
End sub

Private Sub ProductBindingSource_CurrentChanged(sender As Object, e As  EventArgs) Handles ProductBindingSource.CurrentChanged

context.Entry(ProductBindingSource.Current).Collection("ProductDetails").Load()
    ProductDetailsBindingsource.Datasource=DirectCast(ProductBindingSource.Current, Product).ProductDetails
End sub

  Private Sub RollBack()
    Dim changedEntries = context.ChangeTracker.Entries().Where(Function(x) x.State <> EntityState.Unchanged).ToList()
    For Each entry In changedEntries

        Select Case entry.State
            Case EntityState.Modified
                entry.CurrentValues.SetValues(entry.OriginalValues)
                entry.State = EntityState.Unchanged
            Case EntityState.Added
                entry.State = EntityState.Detached
            Case EntityState.Deleted
                entry.State = EntityState.Unchanged
        End Select
    Next
End Sub

I have 2 problems with this code :
1.when I delete a ProductDetail from the second Grid , and after execute the rollback Sub , the deleted ProductDetail is not back on that datagrid , andalso when I add new Productdetail when I rollback this is not removed from the gridview.( other modifications in values , are reverted to original values).

2.On the sub ProductBindingSource_CurrentChanged , everytime that the user select a product in the first grid , the second grid is filled with ProductDetails and database is queried with .Load. But this is ok when the user select a Product for the first time . What about when the user select a Product for the second or third time ? The product Details are already loaded , so what to do to not query again from database but use local data ?
Thank you !

modified 6-Dec-18 7:17am.

Coffee_Break5-Dec-18 1:27

Coffee_Break

5-Dec-18 1:27

The drawlines feature does not work correctly in the following codes. but it works correctly when the same data is drawn with the drawline. Drawlines draws lines that are not real. What are your comments?

Dim uImage As Bitmap = New Bitmap(PictureBox1.Size.Width, PictureBox1.Size.Height, 4, Imaging.PixelFormat.Format32bppPArgb, 0)

   Dim Grafik As Graphics = Graphics.FromImage(uImage)

   Grafik.Clear(Color.Black)

   Dim Offset As Integer = 0
   Dim Gain As Integer = 1
   Dim Freq As Integer = 1
   Dim N As Integer = PictureBox1.Size.Width

   Dim D(N - 1) as PointF

    ' Create Data
    '
    For i As Integer = 0 To N - 1
        D(i).X = i
        D(i).Y = Offset + Gain * Math.Cos(i * Freq * Math.PI / 180.0)
    Next

   ' Scale for drawing
   '
   Dim sx As Double = PictureBox1.Size.Width / (N - 1)
   Dim sy As Double = PictureBox1.Size.Height * 0.5

   ' increase gain
   '
   sy=sy*32000

   ' Data to Pixel
   '
   For i As Integer = 0 To N - 1
       D(i).X = D(i).X * sx
       D(i).Y = PictureBox1.Size.Height * 0.5 - D(i).Y * sy
   Next

    ' DrawLines is not correct
    '
    Grafik.DrawLines(New Pen(Color.Blue), D)

   ' DrawLine is correct
   '
    For i As Integer = 1 To N - 1
        Grafik.DrawLine(New Pen(Color.Red), D(i - 1), D(i))
    Next

    PictureBox1.Image = Nothing
    PictureBox1.Image = uImage

    Grafik.Dispose()

I would like to provide additional information. Errors may occur when Picturebox reaches a specific size. The dimensions for this example are 720; 530 pixels. the following image is being obtained:
Blue lines should not appear in the image. Should overlap with the red lines.
https://i.hizliresim.com/MVXM2g.png[^]

Re: Drawlines is correct or not ?

Eddy Vluggen5-Dec-18 2:05