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Visual Basic 2008 Graphics - Drawing multiple circumscribed circles

Posted on 2009-05-07
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1,578 Views
Last Modified: 2013-11-27
Circle within a circle within a circle...etc...etc...down to 1 point

Circles must have a constant radius. No elipses please.

Please Include complete project (which includes form1) with screenshot.

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Question by:NerdsOfTech
  • 2
3 Comments
 
LVL 85

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 24331011
Here is the "opposite" approach...starting in the middle and working our way out:
Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.DoubleBuffered = True
    End Sub
 
    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        Static R As New Random
        Dim C As Color
        Dim center As New Point(Me.ClientRectangle.Width / 2, Me.ClientRectangle.Height / 2)
        Dim rc As Rectangle = New Rectangle(center.X, center.Y, 1, 1)
        While rc.Width < Me.ClientRectangle.Width AndAlso rc.Height < Me.ClientRectangle.Height
            C = Color.FromArgb(255, R.Next(0, 256), R.Next(0, 256), R.Next(0, 256))
            Using P As New Pen(C, 2)
                e.Graphics.DrawEllipse(P, rc)
            End Using
            rc.Inflate(1, 1)
        End While
    End Sub
 
    Private Sub Form1_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.SizeChanged
        Me.Refresh()
    End Sub
 
End Class

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CircleDemo2.jpg
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LVL 19

Author Comment

by:NerdsOfTech
ID: 24331232
Nice! Is Inflate the only way to go about this?

Now if you were to start from the largest circle and go inward -- how would you approach this differently?

In other words is there a way to go from largest circle to smallest circle by using "square" retangle paths with smaller and smaller side lengths, etc. to guide the radius lengths downward until the path is 1 (and draw one point)?

Related Question: LINKED!
I am interested in how to do this without inflate going from outermost circle to the innermost point
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LVL 19

Author Closing Comment

by:NerdsOfTech
ID: 31579222
Incredible! Nice work again!
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