[vtkusers] Re: Change color of axes

[Goodwin Lawlor]

Hi
You might find it easier to do it this way (and maybe vtkAxes should be
changed to do it this way...)

# Get rid of the point scalars
[[axes GetOutput] GetPointData] SetScalars ""

# Set up and use some cell scalars... can use RGB values
vtkUnsignedCharArray colors
colors SetNumberOfComponents 3
colors SetNumberOfTuples 3
#to set the x axes to red (rgb = 255 0 0)
colors SetTuple3 0 255 0 0
#to set the y axis to yellow (rgb = 255 255 0)
colors SetTuple3 1 255 255 0
#to set the z axis to green (rgb = 0 255 0)
colors SetTuple3 2 0 255 0
[[axes GetOutput] GetCellsData] SetScalars colors

If the Java color chooser gives you 3 numbers between 0 and 1, multiply them
by 255 to get the correct values for the "colors" array.

hth

Goodwin

----- Original Message ----- 
From: "Kanghong Li" <kli at issi-hsv.com>
To: "Goodwin Lawlor" <goodwin.lawlor at ucd.ie>
Sent: Thursday, January 20, 2005 10:10 PM
Subject: Re: Change color of axes


> Thanks. I was wondering if this can be done dynamically? Like if user
> selects colors for the X,Y,Z axes from Java color chooser, can I update
the
> axes graph based on their selection? How do I obtain current graph's axes?
> Also there might be a mapping problem between the value returned by the
Java
> color chooser and the scalar values that VTK uses.
>
> Sorry, this might be something simple for you, but I am stuck and I am new
> to VTK.
>
> Thanks so much for your help.
>
> KL
> ----- Original Message -----
> From: "Goodwin Lawlor" <goodwin.lawlor at ucd.ie>
> To: <kli at issi-hsv.com>
> Sent: Tuesday, January 18, 2005 5:58 PM
> Subject: Re: Change color of axes
>
>
> > Change the values of the point data scalars to a number between 0 and 1.
> >
> > The default is 0 0 0.25 0.25 0.5 0.5 (there are six scalars for the 6
> > points... 2 for each line)
> >
> > 0 =  red
> > 0.25 = yellow
> > 0.5 = green
> > (1.0 = blue)
> >
> > These values are indexes into the default lookup table.
> >
> > So to change the green axis to blue:
> >
> > vtkAxes axes
> >     axes Update
> >
> > set scalars [[[axes GetOuput] GetPointData] GetScalars]
> >
> > $scalars SetTuple1 4 1.0
> > $scalars SetTuple1 5 1.0
> >
> > hth
> >
> > Goodwin
> >
> > "Kanghong Li" <kli at issi-hsv.com> wrote in message
> > news:000501c4fdb3$2802c520$7b01a8c0 at SUN...
> > > How can we change the defaut colors (red(x), yellow(y), green(z)) of
the
> > > vtkaxes? Thanks.
> > >
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