[RESOLVED] Scale Graphics to Image or create custom co-ordinates?

Hey,

I am currently working on drawing out wire diagrams , I get all the co-ordinates from another program and simply draw them out in a picture box.

vb.net Code:

Private Sub test(Optional mark As Boolean = False)
 
        Dim Img As New Bitmap(PictureBox1.Width, PictureBox1.Height)
 
        Dim g As Graphics = Graphics.FromImage(Img)
 
        g.Clear(Color.White)
 
        Dim graphiccounter As Integer = 0
     
        Dim result As Object
        'Needed to get co-ordinates 
        Dim x() As Object
        Dim y() As Object
        Dim z() As Object
        Dim results As Object
 
        'Will take in x and y values from objects above
        Dim x_loc(0) As Integer
        Dim y_loc(0) As Integer
 
 
         _Paths.Clear()
        namepath.Clear()
 
        For Each row As DataGridViewRow In DataGridView2.Rows
 
            If row.Visible = True Then
                'sets variables to nothing, needed in order to run certain commands
                results = Nothing
                x = Nothing
                y = Nothing
                z = Nothing
 
              
 
                'get the co-ordinates and stores them in x,y,z. results will contain the number of co-ordinates stored.
                result = cor.GetPath(x, y, z)
                
                're declares variables based on how many co-ordinates
                ReDim x_loc(result)
                ReDim y_loc(result)
 
 
         
                counter = 1
 
                _Paths.Add(New GraphicsPath)
                namepath.Add(New NamedPath)
                For k = 1 To result - 1
 
                    x_loc(k) = (x(k))
                    y_loc(k) = PictureBox1.Height - (y(k))
                    x_loc(k + 1) = (x(k + 1))
                    y_loc(k + 1) = PictureBox1.Height - (y(k + 1)) 
                    spacer += 5
 
                   
                        _Paths(graphiccounter).AddLine(x_loc(k), y_loc(k), x_loc(k + 1), y_loc(k + 1))
                        namepath(graphiccounter).Name = row.Cells("Core_Id").Value
                        namepath(graphiccounter).Path = _Paths(graphiccounter)
                        'g.FillEllipse(Brushes.Black, x_loc(k + 1) - 4, y_loc(k + 1) - 4, 8, 8)
 
                        counter = counter + 1
          
 
                Next
 
 
                _Pen = New Pen(Brushes.HotPink, 5)
                g.DrawPath(_Pen, namepath(graphiccounter).Path)
                graphiccounter += 1
 
 
                '  Console.WriteLine("New Line")
            End If
        Next
     
        PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize
        PictureBox1.Image = Img
 
    End Sub

So that is my code, some of the code may look funky, but that is because I am using a COM object and Windows Script Host Model.

The results I get back in x and y and co-ordinates based on the other program's co-ordinates. Ofcourse it is easy for me to adjust the co-ordinates so that it works on my screen but how would I go about drawing it so that the image automatically redraws to size based on the window?

Is it possible to set the co-ordinate system of the GDI graphics? For example a setting to tell windows that every 10 points is just 1.

so for the picture box of height 100x100. The co-ordinates start at 0 and go to 400, making each point in the picturebox actually 0.25.

I am looking around for answer but any suggestions is appreciated :)

you can use the graphics object's scaletransform method:

Attachment 99813

Code:

---

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.SetClientSizeCore(100, 100)
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.ScaleTransform(0.25, 0.25)
        e.Graphics.DrawLine(Pens.Red, 50, 50, 75, 350)
    End Sub

End Class

---

or if you want the y axis to start at 0 in the bottom left corner:

Code:

---

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.SetClientSizeCore(100, 100)
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.TranslateTransform(0, 100)
        e.Graphics.ScaleTransform(0.25, -0.25)
        e.Graphics.DrawLine(Pens.Red, 50, 50, 75, 350)
    End Sub

End Class

---

Quote:

---

Originally Posted by .paul.

you can use the graphics object's scaletransform method:

Attachment 99813

Code:

---

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.SetClientSizeCore(100, 100)
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.ScaleTransform(0.25, 0.25)
        e.Graphics.DrawLine(Pens.Red, 50, 50, 75, 350)
    End Sub

End Class

---

---

Quote:

---

Originally Posted by .paul.

or if you want the y axis to start at 0 in the bottom left corner:

Code:

---

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.SetClientSizeCore(100, 100)
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        e.Graphics.TranslateTransform(0, 100)
        e.Graphics.ScaleTransform(0.25, -0.25)
        e.Graphics.DrawLine(Pens.Red, 50, 50, 75, 350)
    End Sub

End Class

---

---

Thank You and Thank You

Exactly what I Was looking for :)


EDIT: This is completely throwing of my graphic paths though :\