topic Converting colors in .NET Forum

Converting colors

Anonymous — Wed, 02 May 2007 08:34:28 GMT

How do I convert an AutoCad color to a system.drawing.color if the AutoCad. color is by Index

switch (autoCadLayer.Color.ColorMethod)
{
case Autodesk.AutoCAD.Colors.ColorMethod.ByColor:
System.Drawing.Color color = autoCadLayer.Color.ColorValue;
break;

case Autodesk.AutoCAD.Colors.ColorMethod.ByAci:
System.Drawing.Color color = System.Drawing.Color.FromArgb(?, ?, ?);
break;
}

Re: Converting colors

Anonymous — Thu, 03 May 2007 12:15:45 GMT

Perhaps try something like :

PromptSelectionOptions selectionOptions = new PromptSelectionOptions();
PromptEntityResult entityRes = ed.GetEntity("\nPick something");

//Do nothing if selection is unsuccessful
if (entityRes.Status != PromptStatus.OK)
return;
//
Entity ent = (Entity)tr.GetObject(entityRes.ObjectId, OpenMode.ForWrite);
//
if (ent.Color.IsByAci == false)
return;
//
System.Drawing.Color winColor = System.Drawing.Color.FromArgb(
ent.Color.ColorValue.A,
ent.Color.ColorValue.R,
ent.Color.ColorValue.G,
ent.Color.ColorValue.B
);
ed.WriteMessage("\n "
+ winColor.Name.ToString()
+ " .... "
+ winColor.ToString()
);
//

/// kwb
wrote in message news:5571705@discussion.autodesk.com...
How do I convert an AutoCad color to a system.drawing.color if the AutoCad.
color is by Index

switch (autoCadLayer.Color.ColorMethod)
{
case Autodesk.AutoCAD.Colors.ColorMethod.ByColor:
System.Drawing.Color color = autoCadLayer.Color.ColorValue;
break;

case Autodesk.AutoCAD.Colors.ColorMethod.ByAci:
System.Drawing.Color color = System.Drawing.Color.FromArgb(?, ?, ?);
break;
}

Re: Converting colors

Anonymous — Thu, 03 May 2007 13:36:21 GMT

Kerry

I tried this before I posted the question.

The problem is that if the color mode is by index then the ARGB slots do not contain Red Green & Blue values. The A slot appears to be 255 and the R slot holds the index number and G & B are zero

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 03:13:05 GMT

Dave,
I'd have to see your code, but ..
It looks like you're working with a LayerTableRecord
so, by my understanding,
so you should be able to do what you need from the ltr.Color.ColorValue.R
... etc, fed to the
System.Drawing.Color.FromArgb( A, R,G, B) as I've shown.

/// kwb

wrote in message news:5573590@discussion.autodesk.com...
Kerry

I tried this before I posted the question.

The problem is that if the color mode is by index then the ARGB slots do not
contain Red Green & Blue values. The A slot appears to be 255 and the R slot
holds the index number and G & B are zero

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 07:35:26 GMT

Kerry

Tks for reply. Here is the code. Its a common call when reading the layer table and the entities.

If I have a layer with a colour that is ByAci then in the ColorValue object I have the following

ColorValue = "{Name=ff050000, ARGB=(255, 5, 0, 0)}"

Five being the Acad index for Blue

If however I have a layer where the colour is ByValue I get the following, which is good

ColorValue = "{Name=ff2109f6, ARGB=(255, 33, 9, 246)}"

When I read the entities I use the same method

If the color is by layer I don't need to look at the entities color (it is empty anyway)

ColorValue = "{Name=ff000000, ARGB=(255, 0, 0, 0)}"

but if the color is not by layer I get exactky the same behaviour as above

Code snippet below.....

NB I'm on leave next week, so if you reply I am not ignoring you !

Many thanks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 09:31:36 GMT

Or just use EntityColor.LookUpRgb()

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000 through 2008
http://www.acadxtabs.com

"Kerry Brown" wrote in message news:5574757@discussion.autodesk.com...
Dave,
I'd have to see your code, but ..
It looks like you're working with a LayerTableRecord
so, by my understanding,
so you should be able to do what you need from the ltr.Color.ColorValue.R
... etc, fed to the
System.Drawing.Color.FromArgb( A, R,G, B) as I've shown.

/// kwb

wrote in message news:5573590@discussion.autodesk.com...
Kerry

I tried this before I posted the question.

The problem is that if the color mode is by index then the ARGB slots do not
contain Red Green & Blue values. The A slot appears to be 255 and the R slot
holds the index number and G & B are zero

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 12:11:12 GMT

Tony

Tks for joining in

What do you mean by EntityColor.LookUpRgb() ?

There is no LookUpRgb method or property on the AutoCAD.Colors.Color object.

Can you be more specific please ?

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 12:16:15 GMT

Tony

Sorry - mis understood - I see there is a static method - just tryimng it now

tks

dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 12:22:54 GMT

Tony

Okay - I now have this
int i = Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 12:56:34 GMT

For your LTR, just for the fun of it, how about :-

System.Drawing.Color argb = System.Drawing.Color.FromArgb(
AcColors.EntityColor.LookUpRgb(
System.Convert.ToByte(
ltr.Color.ColorIndex)));

/// kwb

wrote in message news:5575062@discussion.autodesk.com...
Tony

Okay - I now have this
int i =
Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 13:05:52 GMT

Kerry - What's 'AcColors' ?

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000 through 2008
http://www.acadxtabs.com

"Kerry Brown" wrote in message news:5575042@discussion.autodesk.com...
For your LTR, just for the fun of it, how about :-

System.Drawing.Color argb = System.Drawing.Color.FromArgb(
AcColors.EntityColor.LookUpRgb(
System.Convert.ToByte(
ltr.Color.ColorIndex)));

/// kwb

wrote in message news:5575062@discussion.autodesk.com...
Tony

Okay - I now have this
int i =
Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 13:05:53 GMT

Reading up on the Color class (the .NET one,
not the Autodesk one) should reveal how to
do it.

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000 through 2008
http://www.acadxtabs.com

wrote in message news:5575062@discussion.autodesk.com...
Tony

Okay - I now have this
int i = Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 13:21:08 GMT

On second thought, I think this is all he needs:

Autodesk.AutoCAD.Colors.Color entColor = //

System.Drawing.Color color = entColor.ColorValue;

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000 through 2008
http://www.acadxtabs.com

"Kerry Brown" wrote in message news:5575042@discussion.autodesk.com...
For your LTR, just for the fun of it, how about :-

System.Drawing.Color argb = System.Drawing.Color.FromArgb(
AcColors.EntityColor.LookUpRgb(
System.Convert.ToByte(
ltr.Color.ColorIndex)));

/// kwb

wrote in message news:5575062@discussion.autodesk.com...
Tony

Okay - I now have this
int i =
Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 13:28:43 GMT

Tony,

Just a lame alias 🙂

using AcColors = Autodesk.AutoCAD.Colors;

"Tony Tanzillo" wrote in message
news:5575110@discussion.autodesk.com...
Kerry - What's 'AcColors' ?

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000 through 2008
http://www.acadxtabs.com

"Kerry Brown" wrote in message
news:5575042@discussion.autodesk.com...
For your LTR, just for the fun of it, how about :-

System.Drawing.Color argb = System.Drawing.Color.FromArgb(
AcColors.EntityColor.LookUpRgb(
System.Convert.ToByte(
ltr.Color.ColorIndex)));

/// kwb

wrote in message news:5575062@discussion.autodesk.com...
Tony

Okay - I now have this
int i =
Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which returns an integer. How do I get that into RGB (in .NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 13:36:45 GMT

Yep, Works for me 🙂

ltr = (LayerTableRecord)tm.GetObject(ltrId,
OpenMode.ForRead);

System.Drawing.Color winColor =
ltr.Color.ColorValue;

/// kwb

"Tony Tanzillo" <
href="mailto:tony.tanzillo@THE_URL_BELOW.com">
size=2>tony.tanzillo@THE_URL_BELOW.com>
wrote in message
face=Arial size=2>news:5575117@discussion.autodesk.com
face=Arial size=2>...

On second thought, I
think this is all he needs:

Autodesk.AutoCAD.Colors.Color entColor
= //

System.Drawing.Color color =
entColor.ColorValue;

--

href="http://www.caddzone.com">
size=2>http://www.caddzone.com

size=2>AcadXTabs: MDI Document Tabs for AutoCAD 2008
Supporting AutoCAD 2000
through 2008

size=2>http://www.acadxtabs.com

"Kerry
Brown" <
size=2>kwb@home> wrote in message

size=2>news:5575042@discussion.autodesk.com
size=2>...
For your LTR, just for the fun of it, how about
:-

System.Drawing.Color argb =
System.Drawing.Color.FromArgb(

AcColors.EntityColor.LookUpRgb(

System.Convert.ToByte(
    ltr.Color.ColorIndex)));

///
kwb

<Thiss> wrote in message
href="news:5575062@discussion.autodesk.com">
size=2>news:5575062@discussion.autodesk.com
size=2>...
Tony

Okay - I now have this
int i =

Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(acadColor.ColorValue.R);

Which
returns an integer. How do I get that into RGB (in
.NET)?

Tks

Dave

Re: Converting colors

Anonymous — Fri, 04 May 2007 14:14:25 GMT

Guys

All sorted tks - didn;t spot I could just pass the integer returned by the LookUpRgb into the Syste.Color.FromArgb method

Tks for help

Dave