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Ok, typical I ponder over something for hours then post something on here, then a quick visit to the loo and I Ive found how to do it !!! 
 
I'll post the code after :)
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Were you talking about creating polygons? &nbsp;
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Or possibly something more scatological? &nbsp;;-) 
 
The coordinates of a square are pretty simple, so I suspect this is just an illustration of more complex shapes that you might need to deal with. &nbsp;Is the GraphicsPath.PathPoints of any possible use to you? 
 
Cheers, 
Randy
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Ok, this is what I cam up with. 
 
If you create a black outline of an image in ms paint, like a square or one of the predefined shapes like star etc. 
It'll recreate the image in a point to point array. 
 
Might be a better way of doing it but this is my quick solution. 
Pretty fast too. 

<pre><code class="code-100 nolinks" id="code-1014925">Public Class Form1
 Public oMapImage As New MapImage
 Private oPoints() As Point = Nothing

 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 Dim Background As New Bitmap(&quot;C:\Data\Development Tests\Get Image Regions\Image1.bmp&quot;)
 oPoints = oMapImage.Map(Background)
 End Sub

 Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
 If oPoints Is Nothing Then Exit Sub

 Using gr As Graphics = e.Graphics
 gr.Clear(Color.White)
 gr.DrawLines(Pens.Black, oPoints)
 End Using
 End Sub
End Class

Public Class MapImage
 Private oPoints() As Point = Nothing

 Public Function Map(ByVal Background As Bitmap) As Point()
 Dim MatrixStart As Point = Nothing
 Dim MatrixCentre As New Point(-1, -1)
 Dim PreviousPoint As Point = Nothing
 Dim Finished As Boolean = False
 Dim Y As Integer = 0
 Dim X As Integer = 0
 Dim FirstWhiteCell As Boolean = False
 Dim iPosToCheck As Integer = 1
 Dim BackgroundColor As Color = Background.GetPixel(0, 0)

 '//-- Get first black pixel - scan pixels left to right / top to bottom
 For Y = 0 To Background.Width - 1
 For X = 0 To Background.Height - 1
 If Background.GetPixel(X, Y).ToArgb &lt;&gt; BackgroundColor.ToArgb Then
 '//-- Add first point to array !
 MatrixCentre = AddPoint(X, Y)
 Exit For
 End If
 Next
 If MatrixCentre.X &lt;&gt; -1 Then Exit For
 Next

 '//-- Worm your way around the pixel to find the next black pixel clockwise starting with the current
 MatrixStart = MatrixCentre
 While Not Finished
 FirstWhiteCell = False

 Do
 Select Case iPosToCheck
 Case 1 : X = MatrixCentre.X - 1 : Y = MatrixCentre.Y
 Case 2 : X = MatrixCentre.X - 1 : Y = MatrixCentre.Y - 1
 Case 3 : X = MatrixCentre.X : Y = MatrixCentre.Y - 1
 Case 4 : X = MatrixCentre.X + 1 : Y = MatrixCentre.Y - 1
 Case 5 : X = MatrixCentre.X + 1 : Y = MatrixCentre.Y
 Case 6 : X = MatrixCentre.X + 1 : Y = MatrixCentre.Y + 1
 Case 7 : X = MatrixCentre.X : Y = MatrixCentre.Y + 1
 Case 8 : X = MatrixCentre.X - 1 : Y = MatrixCentre.Y + 1
 End Select

 If Background.GetPixel(X, Y).ToArgb = BackgroundColor.ToArgb Then FirstWhiteCell = True
 If FirstWhiteCell AndAlso Background.GetPixel(X, Y).ToArgb &lt;&gt; BackgroundColor.ToArgb Then
 '//-- Add next point to array !
 MatrixCentre = AddPoint(X, Y)

 Select Case iPosToCheck
 Case 1 : iPosToCheck = 5
 Case 2 : iPosToCheck = 6
 Case 3 : iPosToCheck = 7
 Case 4 : iPosToCheck = 8
 Case 5 : iPosToCheck = 1
 Case 6 : iPosToCheck = 2
 Case 7 : iPosToCheck = 3
 Case 8 : iPosToCheck = 4
 End Select

 FirstWhiteCell = False

 If MatrixStart = MatrixCentre Then
 Finished = True
 Exit Do
 End If
 Else
 iPosToCheck += 1
 If iPosToCheck &gt; 8 Then iPosToCheck = 1
 End If
 Loop

 End While

 Return oPoints
 End Function

 Private Function AddPoint(ByVal X As Integer, ByVal Y As Integer) As Point
 If oPoints Is Nothing Then
 ReDim oPoints(0)
 oPoints(0).X = X
 oPoints(0).Y = Y
 Else
 Dim Counter As Integer = oPoints.Length
 ReDim Preserve oPoints(Counter)
 oPoints(Counter).X = X
 oPoints(Counter).Y = Y
 End If

 Return New Point(X, Y)
 End Function
End Class
</code></pre>
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Wow, not seen that before thanks.
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I would think that you might benefit more optimizations. &nbsp; 
 
1) Use generics--List(Of Point), and list.Add(point) 
 
2) If you are just building points to redraw a line, you might be able to remove points that are on a similar line, so that you only have the end-points. &nbsp;Determine direction of line, by comparing two points, and see if Math.Abs(x1 - x2) &lt;&nbsp;tolerance or if Math.Abs(y1 - y2) &lt;&nbsp;tolerance. 
 
Example: 
(1, 1) 
(1, 2) 
(1, 3) 
(1, 4) 
 
would become just (1, 1) and (1, 4)
</div>

<div>
TheLearnedOne, you are genius once again ! 
 
Never used List before, so good to learn something new. 
 
I was trying to work out how I was going to remove duplicate points too, my idea wasn’t as tidy as yours though! 
 
Cheers for your help ! 

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<div>
<div class="content wysiwyg-content">
Hi, I have a problem: 
 
I have an image of a square (for example). I want to get the coordinates of the square into an array of points. 
A bit like a shape created by a “join the dots” kind of thing. 
 
How the hell do I do this? 
 
I’ve thought of scanning pixel by pixel across the image but this doesn’t give me a point to point array. 
 
The purpose of this is I’ve built an application you can add shapes to on the form. 
So I want to be able to draw the shapes in ms paint, then get the coordinates and import them into my application at runtime. 
Just solid shapes are all I need. 

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</div>

Hi, I have a problem:

I have an image of a square (for example). I want to get the coordinates of the square into an array of points.
A bit like a shape created by a “join the dots” kind of thing.

How the hell do I do this?

I’ve thought of scanning pixel by pixel across the image but this doesn’t give me a point to point array.

The purpose of this is I’ve built an application you can add shapes to on the form.
So I want to be able to draw the shapes in ms paint, then get the coordinates and import them into my application at runtime.
Just solid shapes are all I need.


Getting shape coordinates.

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