Drawing to a View in CocoaSharp

[rob.m...@gmail.com]

I'm having a problem with drawing in a View. What happens is that
whenever I try to call Graphics.GetHwnd(this.NativeReference) I get a
very long winded BAD_EXEC_ACCESS error or something along those
lines. If anyone has any experience using the Graphics object in a
View context let me know. If asked I can provide an error printout,
just not this second.

The BezierPath.FillRect method call works just fine. I'm assuming
because it's just a simple wrapper over the NSBezierPath cocoa class.
But there doesn't seem to be very much in the way of extended Cocoa
drawing calls in Cocoa#. Stuff like NSFillRect.

BTW the code was taken directly from the View demo included in the
latest release of Cocoa#.

Any help and suggestions would be much appreciated. Thanks again.

Robert

[breeve]

I have tried running the View demo as well. I couldn't get them to
run. They are using System.Drawing which currently requires X.
Ironically, it wouldn't run under X either. The other examples ran.

I think the bigger question is how to do Quartz drawing from Cocoa #.
I don't see anything equivalent to NSGraphicsContext in Cocoa#. Am I
missing something obvious?

Brock

On Sep 21, 12:56 pm, "rob.mch...@gmail.com" <rob.mch...@gmail.com>
wrote:

[rob.m...@gmail.com]

I would concur. But I'm only superficially familiar with the project.

I took the assumption that the System.Drawing routines were modified
so they could draw to an NSView. But this is probably incorrect.

I like C# as a language but it would seem that I am unable to use
Cocoa# for development if I can't do drawing to quartz.

I did have one other question. Is there an objective-c helper class
that allows one to make calls into the Mono runtime. Something that
would allow me to create a Proxy object in objective c. Something
that would forward my message sends to the mono class instance.
Possibly by doing some kind of message translation routines or lookup?

[breeve]

Ok. I dug in deeper. You can draw via the BezierPath class. I added a
constructor and methods to the BezierPath below:

public BezierPath() : base()
{
}

public void MoveToPoint(Point point)
{
ObjCMessaging.objc_msgSend(NativeObject, "moveToPoint:",
typeof(void), typeof(Point), point);
}

public void LineToPoint(Point point)
{
ObjCMessaging.objc_msgSend(NativeObject, "lineToPoint:",
typeof(void), typeof(Point), point);
}

public void Stroke()
{
ObjCMessaging.objc_msgSend(NativeObject, "stroke",
typeof(void));
}

Now you can do something inside the Draw of one of the samples like:

Color.Black.Set();
BezierPath.FillRect(aRect);
Color.Red.Set();
BezierPath path = new BezierPath();
path.MoveToPoint(new Point(3,3));
path.LineToPoint(new Point(50,50));
path.Stroke();

-- Brock

On Oct 4, 10:36 am, "rob.mch...@gmail.com" <rob.mch...@gmail.com>
wrote:

> > > Robert- Hide quoted text -
>
> - Show quoted text -

[Tizzo]

I'm looking at the BezierPath class and it appears that you guys might
not be looking at the latest revision of the library. See the
following link:

http://anonsvn.mono-project.com/viewcvs/trunk/cocoa-sharp/src/Cocoa/BezierPath.cs?diff_format=h&view=markup

This class already has a default constructor and etc.

Breeve, if you have some updates to this file. Let me know and I can
add them. I could probably just take what you have here in this post.

[breeve]

I have the latest source and the BezierPath class does not have a
default constructor. If a class doesn't have a constructor the C#
compiler will create a default one for you. If you define a
constructor csc will not create a default constructor. Since
BezierPath defined a constructor, a default constructor was not
automatically generated so I added one. For example:

B b = new B(); //does not work.

private class A
{
public A()
{
}

public A(int a)
{
}
}

private class B : A
{
public B(int a)
: base(a)
{
}
}

I am not a Cocoa expert by any means. I am just playing around with
the API and noticed there wasn't a lot of drawing functionality
exposed. I am not familiar with the process for contributing to open
source projects. Do you need a patch file? My changes are what I
posted.

Thanks,

Brock

On Nov 1, 1:04 pm, Tizzo <schav...@gmail.com> wrote:
> I'm looking at the BezierPath class and it appears that you guys might
> not be looking at the latest revision of the library. See the
> following link:
>

> http://anonsvn.mono-project.com/viewcvs/trunk/cocoa-sharp/src/Cocoa/B...

> > > - Show quoted text -- Hide quoted text -