[geeks] Postscript question

[Greg A. Woods]

[ On Tuesday, November 19, 2002 at 15:43:54 (-0500), Joshua D Boyd wrote: ]
> Subject: [geeks] Postscript question
>
> I have one quick question about how to do something in poscript.
> 
> /inch {72 mul} def      % Convert inches->points (1/72 inch)
> 1 0 0 setrgbcolor
> newpath                 % Start a new path
> 1 inch 1 inch moveto    % an inch in from the lower left
> 2 inch 1 inch lineto    % bottom side
> 2 inch 2 inch lineto    % right side
> 1 inch 2 inch lineto    % top side
> closepath               % Automatically add left side to close path
> fill                    % Fill in the box on the paper
> showpage                % We're done... eject the page
> 
> So, this code makes is easy for drawing a red square.
> 
> The question is, what if I want to draw a box where the corners are 4
> different shades.  Say a box with a red corner, a blue corner, a green
> corner, and a black corner.  How in the world would I pull that off?

How do you define "corner"?

In PostScript a corner is just a point (in the true geometry sense).  It
can't have a colour (though of course a single pixel will overlay a
point and so that one pixel could have a colour).  Only the lines
joining points, or the areas between sets of points, can have colours.

-- 
								Greg A. Woods

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