Re: DrawImage and NearestNeighbor bug?
- From: Jelle van der Beek <JellevanderBeek@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 24 Oct 2005 09:54:01 -0700
Thanks a lot Bob!
I must say I find it difficult to find out which of the properties to set,
in order to create the effect that I have in mind. Not very intuitive imho.
Microsoft decided to set properties in the Graphics object instead of, for
instance, passing an options struct to the various draw methods. I can
understand this, but the two are inseparatable. At least the class reference
could assist here: the help on DrawImage could point to the properties that
affect the drawing. Same goes for all Graphics.Draw* and Graphics.Fill*
methods.
"Bob Powell [MVP]" wrote:
> Set your PixelOffsetMode to Half.
>
> --
> Bob Powell [MVP]
> Visual C#, System.Drawing
>
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> "Jelle van der Beek" <JellevanderBeek@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
> message news:6EC2A962-5B49-4E0A-8E00-363E0D505AF5@xxxxxxxxxxxxxxxx
> > Hi,
> >
> > I am drawing an image, stretched, with interpolation set to
> > NearestNeighbor.
> > I want to be able to count the pixels and all. There seems to be a bug in
> > the
> > scaling in this interpolation mode. I actually think it occurs in all
> > modes,
> > but it is best visible in this mode. Somebody else has already posted this
> > problem but now I have a very simple piece of code to reproduce it.
> >
> > I created a checkboard of 5x5 pixels and painted it in a panel. I stretch
> > the image exactly 10 times in x and y. So I take the bitmap width and
> > height
> > and multiply it by 10. You can see that the left column and top column are
> > scaled exactly half the width that they should be. This sounds like an
> > rounding error in the interpolation code to me, but maybe it's by design?
> >
> > If it is by design, can anybody tell me how to do this the right way? If
> > it's not, then consider this a bug-report ;).
> >
> > Here's the code. Create your own 5x5 checkerboard tiff.
> >
> > public partial class Form1 : Form
> > {
> > private Panel m_PaintPanel;
> >
> > public Form1()
> > {
> > InitializeComponent();
> > }
> >
> > private void InitializeComponent()
> > {
> > this.m_PaintPanel = new System.Windows.Forms.Panel();
> > this.SuspendLayout();
> > //
> > // m_PaintPanel
> > //
> > this.m_PaintPanel.Location = new System.Drawing.Point( 48,
> > 48 );
> > this.m_PaintPanel.Name = "m_PaintPanel";
> > this.m_PaintPanel.Size = new System.Drawing.Size( 156, 104 );
> > this.m_PaintPanel.TabIndex = 0;
> > this.m_PaintPanel.Paint += new
> > System.Windows.Forms.PaintEventHandler( this.panel1_Paint );
> > //
> > // Form1
> > //
> > this.ClientSize = new System.Drawing.Size( 292, 266 );
> > this.Controls.Add( this.m_PaintPanel );
> > this.Name = "Form1";
> > this.Load += new System.EventHandler( this.Form1_Load );
> > this.ResumeLayout( false );
> >
> > }
> >
> > private Bitmap m_Bitmap = null;
> >
> > private void Form1_Load( object sender, EventArgs e )
> > {
> > m_Bitmap = new Bitmap( @"..\..\test.tif" );
> > }
> >
> > private void panel1_Paint( object sender, PaintEventArgs e )
> > {
> > e.Graphics.InterpolationMode =
> > System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
> > e.Graphics.DrawImage( m_Bitmap, new Rectangle( 0, 0,
> > m_Bitmap.Width * 10, m_Bitmap.Height * 10 ) );
> > }
> > }
>
>
>
.
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