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copied!<p>You should create a custom UserControl and use the Paint even to draw on the surface of the control. The Paint event provides you with a Graphics object which you can use to draw the graph. The big thing to know, however, is that you will need to swap your Y axis. In windows, the top-left of the screen is 0,0 rather than the bottom-left.</p> <p>So, for instance, the following code will draw the x and y axis of a graph on a contorl:</p> <pre><code>Public Class CartesianGraph Public Property BottomLeftExtent() As Point Get Return _bottomLeftExtent End Get Set(ByVal value As Point) _bottomLeftExtent = value End Set End Property Private _bottomLeftExtent As Point = New Point(-100, -100) Public Property TopRightExtent() As Point Get Return _topRightExtent End Get Set(ByVal value As Point) _topRightExtent = value End Set End Property Private _topRightExtent As Point = New Point(100, 100) Private Sub CartesianGraph_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint Dim extentHeight As Integer = _topRightExtent.Y - _bottomLeftExtent.Y Dim extentWidth As Integer = _topRightExtent.X - _bottomLeftExtent.X If (extentHeight <> 0) And (extentWidth <> 0) Then If (_bottomLeftExtent.Y <= 0) And (_topRightExtent.Y >= 0) Then Dim xAxis As Integer = e.ClipRectangle.Height - (_bottomLeftExtent.Y * -1 * e.ClipRectangle.Height \ extentHeight) e.Graphics.DrawLine(New Pen(ForeColor), 0, xAxis, e.ClipRectangle.Width, xAxis) End If If (_bottomLeftExtent.X <= 0) And (_topRightExtent.X >= 0) Then Dim yAxis As Integer = e.ClipRectangle.Width * _bottomLeftExtent.X * -1 \ extentWidth e.Graphics.DrawLine(New Pen(ForeColor), yAxis, 0, yAxis, e.ClipRectangle.Height) End If End If End Sub End Class </code></pre>

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