Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2001

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Can Mathematica draw overlapping shapes with blended color?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28996] Re: Can Mathematica draw overlapping shapes with blended color?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 24 May 2001 04:07:16 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9e2d7k$69n@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

you can't !
The solution would be alpha-blending, but Mathematica's
PostScript can't handle semitransparent colors.

Regards
  Jens

Xiangdong Liu wrote:
> 
> Hello (again)!
> 
> I posted a similar message earlier, but it didn't seem to make
> it to the newsgroups.
> 
> I wonder if I can draw two overlapping shapes each filled with
> a different color and make the overlapping region to have the
> blending color of those of the two shapes.  In other words,
> can I fill shapes with transparent colors (ink) rather than
> opaque colors (ink)?
> 
> For example, I could do
> 
> In[1]:= Show[Graphics[{RGBColor[0.5, 0.0, 0.0],
>                        Polygon[{{0,0}, {0,2}, {2,2}, {2,0}}]}]];
> 
> In[2]:= Show[Graphics[{RGBColor[0.0, 0.0, 0.5],
>                        Polygon[{{1,1}, {1,3}, {3,3}, {3,1}}]}]];
> 
> In[3]:= Show[Out[1], Out[2]];
> 
> But the color in the overlapping square area is
> RGBColor[0.0, 0.0, 0.5].
> 
> Thank you all!
> 
> Xiangdong Liu


  • Prev by Date: Re: Q: Extract Elements from a List?
  • Next by Date: RE: Q: Extract Elements from a List?
  • Previous by thread: Can Mathematica draw overlapping shapes with blended color?
  • Next by thread: Re: Can Mathematica draw overlapping shapes with blended color?