Re: rotate drawing with matrix

From: Peter Proost (pproost_at_nospam.hotmail.com)
Date: 12/07/04 

Date: Tue, 7 Dec 2004 16:55:35 +0100

Thanks, that's what I wanted to do Bob,

Greetz Peter

"Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message
news:u8zH4GH3EHA.3932@TK2MSFTNGP12.phx.gbl...
> Like this??
>
> (after my signature)
>
> --
> Bob Powell [MVP]
> Visual C#, System.Drawing
>
> Find great Windows Forms articles in Windows Forms Tips and Tricks
> http://www.bobpowell.net/tipstricks.htm
>
> Answer those GDI+ questions with the GDI+ FAQ
> http://www.bobpowell.net/faqmain.htm
>
> All new articles provide code in C# and VB.NET.
> Subscribe to the RSS feeds provided and never miss a new article.
>
>
> ------------------------------------------------------------------------
> Protected Overrides Sub OnPaint(ByVal e As
> System.Windows.Forms.PaintEventArgs)
>
>
>
> Dim mx As New Matrix
>
> mx.Translate((Me.ClientSize.Width / 2) - 150, (Me.ClientSize.Height / 2) -
> 150, MatrixOrder.Append)
>
> e.Graphics.Transform = mx
>
> e.Graphics.FillRectangle(brush, 100, 100, 100, 100)
>
> 'Place inside form paint event
>
> mx = New Matrix
>
> mx.RotateAt(hoek, New PointF(150, 150), MatrixOrder.Append)
>
> mx.Translate((Me.ClientSize.Width / 2) - 150, (Me.ClientSize.Height / 2) -
> 150, MatrixOrder.Append)
>
> e.Graphics.Transform = mx
>
> 'grote ster
>
> e.Graphics.DrawLine(pentje, 100, 100, 150, 0)
>
> e.Graphics.DrawLine(pentje, 150, 0, 200, 100)
>
> e.Graphics.DrawLine(pentje, 200, 100, 300, 150)
>
> e.Graphics.DrawLine(pentje, 300, 150, 200, 200)
>
> e.Graphics.DrawLine(pentje, 200, 200, 150, 300)
>
> e.Graphics.DrawLine(pentje, 150, 300, 100, 200)
>
> e.Graphics.DrawLine(pentje, 100, 200, 0, 150)
>
> e.Graphics.DrawLine(pentje, 0, 150, 100, 100)
>
> 'kleine ster
>
> e.Graphics.DrawLine(pentje, 100, 100, 150, 25)
>
> e.Graphics.DrawLine(pentje, 150, 25, 200, 100)
>
> e.Graphics.DrawLine(pentje, 200, 100, 275, 150)
>
> e.Graphics.DrawLine(pentje, 275, 150, 200, 200)
>
> e.Graphics.DrawLine(pentje, 200, 200, 150, 275)
>
> e.Graphics.DrawLine(pentje, 150, 275, 100, 200)
>
> e.Graphics.DrawLine(pentje, 100, 200, 25, 150)
>
> e.Graphics.DrawLine(pentje, 25, 150, 100, 100)
>
> 'kleinere ster
>
> e.Graphics.DrawLine(pentje, 100, 100, 150, 50)
>
> e.Graphics.DrawLine(pentje, 150, 50, 200, 100)
>
> e.Graphics.DrawLine(pentje, 200, 100, 250, 150)
>
> e.Graphics.DrawLine(pentje, 250, 150, 200, 200)
>
> e.Graphics.DrawLine(pentje, 200, 200, 150, 250)
>
> e.Graphics.DrawLine(pentje, 150, 250, 100, 200)
>
> e.Graphics.DrawLine(pentje, 100, 200, 50, 150)
>
> e.Graphics.DrawLine(pentje, 50, 150, 100, 100)
>
> 'kleinste ster
>
> e.Graphics.DrawLine(pentje, 100, 100, 150, 75)
>
> e.Graphics.DrawLine(pentje, 150, 75, 200, 100)
>
> e.Graphics.DrawLine(pentje, 200, 100, 225, 150)
>
> e.Graphics.DrawLine(pentje, 225, 150, 200, 200)
>
> e.Graphics.DrawLine(pentje, 200, 200, 150, 225)
>
> e.Graphics.DrawLine(pentje, 150, 225, 100, 200)
>
> e.Graphics.DrawLine(pentje, 100, 200, 75, 150)
>
> e.Graphics.DrawLine(pentje, 75, 150, 100, 100)
>
> End Sub
>
> ------------------------------------------------------------------------
>
>
> "Peter Proost" <pproost@nospam.hotmail.com> wrote in message
> news:Od8Yau32EHA.924@TK2MSFTNGP14.phx.gbl...
> > Hi group,
> >
> >
> > I got the following piece of code which draws a square with stars round
> it,
> > now I want the stars to rotate round the square, I can do this with the
> > mx.rotate and a timer and an angle, but this rotates the whole drawing
of
> > the stars but what I realy want is for the stars to rotate round it's
> center
> > point, is this possible? I hope I was clear enough in my explanation.
> >
> > Thanks in advance
> >
> > Peter
> >
> >
> >
> > Imports System.Drawing.Drawing2D
> >
> > Private pentje As New Pen(Color.White)
> > Private brush As New SolidBrush(Color.White)
> > Private hoek As Single
> >
> >
> > e.Graphics.FillRectangle(brush, 100, 100, 100, 100)
> >
> > 'Place inside form paint event
> > 'Dim mx As New Matrix
> > 'mx.Rotate(hoek, MatrixOrder.Append)
> > 'mx.Translate(Me.ClientSize.Width / 2, Me.ClientSize.Height / 2,
> > MatrixOrder.Append)
> > 'e.Graphics.Transform = mx
> >
> > 'grote ster
> > e.Graphics.DrawLine(pentje, 100, 100, 150, 0)
> > e.Graphics.DrawLine(pentje, 150, 0, 200, 100)
> > e.Graphics.DrawLine(pentje, 200, 100, 300, 150)
> > e.Graphics.DrawLine(pentje, 300, 150, 200, 200)
> > e.Graphics.DrawLine(pentje, 200, 200, 150, 300)
> > e.Graphics.DrawLine(pentje, 150, 300, 100, 200)
> > e.Graphics.DrawLine(pentje, 100, 200, 0, 150)
> > e.Graphics.DrawLine(pentje, 0, 150, 100, 100)
> > 'kleine ster
> > e.Graphics.DrawLine(pentje, 100, 100, 150, 25)
> > e.Graphics.DrawLine(pentje, 150, 25, 200, 100)
> > e.Graphics.DrawLine(pentje, 200, 100, 275, 150)
> > e.Graphics.DrawLine(pentje, 275, 150, 200, 200)
> > e.Graphics.DrawLine(pentje, 200, 200, 150, 275)
> > e.Graphics.DrawLine(pentje, 150, 275, 100, 200)
> > e.Graphics.DrawLine(pentje, 100, 200, 25, 150)
> > e.Graphics.DrawLine(pentje, 25, 150, 100, 100)
> > 'kleinere ster
> > e.Graphics.DrawLine(pentje, 100, 100, 150, 50)
> > e.Graphics.DrawLine(pentje, 150, 50, 200, 100)
> > e.Graphics.DrawLine(pentje, 200, 100, 250, 150)
> > e.Graphics.DrawLine(pentje, 250, 150, 200, 200)
> > e.Graphics.DrawLine(pentje, 200, 200, 150, 250)
> > e.Graphics.DrawLine(pentje, 150, 250, 100, 200)
> > e.Graphics.DrawLine(pentje, 100, 200, 50, 150)
> > e.Graphics.DrawLine(pentje, 50, 150, 100, 100)
> > 'kleinste ster
> > e.Graphics.DrawLine(pentje, 100, 100, 150, 75)
> > e.Graphics.DrawLine(pentje, 150, 75, 200, 100)
> > e.Graphics.DrawLine(pentje, 200, 100, 225, 150)
> > e.Graphics.DrawLine(pentje, 225, 150, 200, 200)
> > e.Graphics.DrawLine(pentje, 200, 200, 150, 225)
> > e.Graphics.DrawLine(pentje, 150, 225, 100, 200)
> > e.Graphics.DrawLine(pentje, 100, 200, 75, 150)
> > e.Graphics.DrawLine(pentje, 75, 150, 100, 100)
> >
> >
> > Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As
> System.EventArgs)
> > Handles Timer1.Tick
> > hoek += 3
> > If hoek > 359 Then
> > hoek = 0
> > End If
> > Invalidate()
> > End Sub
> >
> >
>
>

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