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|
%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: (atend)
%%Creator: Karl Berry with ideas from code by Roger Hersch
%%CreationDate: 8 March 1991
%%Title: RIDT logo
% This file is public domain.
% Forget everything we do.
save
% Make definitions in our own dictionary.
20 dict begin
% However, this isn't quite a true EPS file, because we use the
% setscreen operator, which has device- and document-dependent effects.
% In particular, if the document is being printed in landscape mode, we
% have to rotate the cell by 90 degrees. The dvips translator sets the
% variable `isls' to be true in landscape mode, so we test for that.
%
/screen_angle
/isls where
{ /isls get { 90 } { 0 } ifelse }
{ 0 }
ifelse
def
% Increasing this number makes the screen finer (it isn't the actual
% frequency).
%
/screen_frequency 10 def
% If you change these numbers, change the bounding box comment above.
% This default size is approximately 134mm by 71mm.
/logo_width 380 def
/logo_height 200 def
% Besides changing the size from the outside, you can also change the
% scale factor defined here. Of course then the bounding box won't be
% accurate.
/scalefactor 1 def
% We need a string to hold the gray values.
/fountainstring 256 string def
% Put values varying from 0 to 255 into the string; these will be values
% for the image operator.
0 1 255
{
fountainstring exch dup
255 div 180 mul cos neg 2 div
.5 add 255 mul cvi
put
}
bind for
% This procedure takes the bounding box of a rectangle, and images
% /fountainstring into it.
/fountain
{
/ury exch def
/urx exch def
/lly exch def
/llx exch def
gsave
llx lly translate
% Scale to the size of the rectangle.
urx llx sub ury lly sub scale
% The source image has one row of 256 8-bit values.
1 256 8
% Map unit square to source.
[1 0 0 -256 0 256]
% Image the string.
{ fountainstring } image
grestore
}
bind def
% Draw a line across the bottom for visual anchoring.
%
0 0 moveto
logo_width 0 lineto stroke
screen_frequency scalefactor div
screen_angle
{ exch pop abs 1 exch sub } bind
setscreen
scalefactor scalefactor scale
/Palatino-Roman findfont 100 scalefont setfont
% Determine the dimensions of our string.
/logo_words (RIDT 91) def
0 0 moveto
logo_words true charpath flattenpath pathbbox
/word_height exch def
/word_width exch def
pop pop % llx and lly are zero.
newpath
/x_offset logo_width word_width sub 2 div def
/y_offset 15 def
% Draw the background pattern, which is dark at the top and light at the
% bottom.
%
0 0 logo_width logo_height fountain
% Make the clipping path be `RIDT 91', twice.
x_offset y_offset moveto
logo_words true charpath
x_offset logo_height y_offset word_height add sub moveto
logo_words true charpath
clip
newpath
% Paint the pattern again, this time with light at the top and dark at
% the bottom.
%
logo_width logo_height translate
180 rotate
0 0 logo_width logo_height fountain
end
restore
% showpage
%%BoundingBox: 0 0 380 200
|
