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<H1>[Mono-osx] System.Drawing into Cocoa views?</H1>
<B>Alain Bocherens</B>
<A HREF="mailto:mono-osx%40lists.ximian.com?Subject=%5BMono-osx%5D%20System.Drawing%20into%20Cocoa%20views%3F&In-Reply-To=32E65F0B-8C3B-4956-B327-DF0BB7585809%40tarkvara.org"
TITLE="[Mono-osx] System.Drawing into Cocoa views?">alain at slide-effect.com
</A><BR>
<I>Mon Jul 18 04:02:28 EDT 2011</I>
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<PRE>Hi Eric,
I faced the exact same problem. I wrote a small class to handle this
case. It is derived from NSView and you only have to inherit from it and
wrote your own OnPaint method.
Here it is:
------------------------------------------------------------------------
using System;
using System.Drawing;
using MonoMac.AppKit;
using MonoMac.Foundation;
namespace SEForms.Forms
{
public class SECustomView
{
public class CustomView : NSView
{
private NSImage _buffer=null;
public override bool IsFlipped
{
get { return true; }
}
public NSImage Buffer
{
set
{
_buffer = value;
}
}
public override void DrawRect (RectangleF dirtyRect)
{
if(_buffer!=null)
{
_buffer.Draw(this.Bounds,new
RectangleF(0,0,_buffer.Size.Width,_buffer.Size.Height),NSCompositingOperation.Copy,1.0f);
}
}
}
private Bitmap _buffer = null;
private CustomView _innerControl = null;
public SECustomView ()
{
_innerControl = new CustomView();
}
public void Invalidate()
{
Graphics g = Graphics.FromImage(_buffer);
OnPaint(g);
g.Dispose();
_innerControl.Buffer = MacTools.ConvertToNSImage(_buffer);
_innerControl.NeedsDisplay = true;
}
public Bitmap InternalBuffer
{
get
{
return _buffer;
}
}
virtual public void OnPaint(Graphics g)
{
// just a test, but otherwrite this method to specialise
the drawing
g.DrawRectangle(Pens.HotPink,10,10,100,100);
}
public Size Size
{
get { return _innerControl.Frame.Size.ToSize(); }
set
{
_innerControl.Frame = new RectangleF
(_innerControl.Frame.Location, value);
if((_buffer==null) || (_buffer.Size != value))
{
if(_buffer!=null)
{
_buffer.Dispose();
}
//resize buffer
_buffer = new
Bitmap((int)value.Width,(int)value.Height);
}
Invalidate();
}
}
public static NSImage ConvertToNSImage(Image img)
{
System.IO.MemoryStream s = new System.IO.MemoryStream();
img.Save(s, System.Drawing.Imaging.ImageFormat.Png);
byte[] b = s.ToArray();
CGDataProvider dp = new CGDataProvider(b,0,(int)s.Length);
s.Flush();
s.Close();
CGImage img2 =
CGImage.FromPNG(dp,null,false,CGColorRenderingIntent.Default);
return new NSImage(img2, new SizeF(img2.Width,img2.Height));
}
}
}
------------------------------------------------------------------------
--
Alain Bocherens
Slide Effect :: Create Amazing Presentations
<A HREF="http://www.slide-effect.com">http://www.slide-effect.com</A>
Banner Effect :: Flash Banners Made Simple.
<A HREF="http://www.banner-effect.com">http://www.banner-effect.com</A>
Le 17.07.2011 23:59, Eric J. M. Smith a &#233;crit :
&gt;<i> Greetings,
</I>&gt;<i>
</I>&gt;<i> I'm new to MonoMac (and to Mono in general). So I apologise in advance for my ignorance.
</I>&gt;<i>
</I>&gt;<i> I'm exploring the feasibility of porting a .NET/Windows app to run on the Mac. I've resigned myself to the fact that we'll be rewriting any code which relies on Windows.Forms widgets. Our existing rendering code draws into a System.Drawing.Image, and it would be nice to not have to rewrite everything. Is there any way of drawing into a System.Drawing.Graphics and making the results available to Cocoa? Either by drawing directly into an NSView or by somehow getting the contents of a System.Drawing.Image into an NSImage.
</I>&gt;<i>
</I>&gt;<i> I did find some mention on this mailing-list of a &quot;drawing bridge&quot; to do libgdiplus drawing in a Cocoa custom view, but I can't find any documentation or samples for this (plus, it sounds like this approach might require X11).
</I>&gt;<i>
</I>&gt;<i> Thanks for your help,
</I>&gt;<i>
</I>&gt;<i> Eric Smith
</I>&gt;<i> Tarkvara Design Inc.
</I>&gt;<i> _______________________________________________
</I>&gt;<i> Mono-osx mailing list
</I>&gt;<i> <A HREF="http://lists.ximian.com/mailman/listinfo/mono-osx">Mono-osx at lists.ximian.com</A>
</I>&gt;<i> <A HREF="http://lists.ximian.com/mailman/listinfo/mono-osx">http://lists.ximian.com/mailman/listinfo/mono-osx</A>
</I></PRE>
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