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###########################################################################
# #
# coltex #
# #
# Jeffrey H. Kingston #
# 30 October 2002 #
# #
# Include file providing @ColourCommand and @TextureCommand symbols. #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either Version 3, or (at your option) #
# any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA #
# #
# As a special exception, when this file is read by Lout when processing #
# a Lout source document, you may use the result without restriction. #
# #
###########################################################################
@SysInclude { lengths } # @PSLengths (needed for @TextureCommand)
###########################################################################
# #
# @ColourCommand #
# #
# Jeff Kingston #
# 19 October 2001 #
# Updated for compatibility with textures 28 October 2002. #
# #
# @ColourCommand converts a colour expressed in a manner that the #
# ordinary user can comprehend into the PostScript or PDF command #
# needed to obtain that colour, suitable for passing to @SetColour #
# or including in the left parameter of @Graphic. #
# #
# This symbol is needed in various places so I've taken the coward's #
# way out and @SysIncluded it at those places. #
# #
# Examples of behaviour for the PostScript back end: #
# #
# Parameter Result #
# ------------------------------------------------------------ #
# black "0.0 0.0 0.0 LoutSetRGBColor" #
# darkblue "0.0 0.0 0.5 LoutSetRGBColor" #
# white "1.0 1.0 1.0 LoutSetRGBColor" #
# none "" #
# nochange "" #
# "" "" #
# rgb <red> <blue> <green> "<red> <blue> <green> LoutSetRGBColor" #
# cymk <c> <y> <m> <k> "<c> <y> <m> <k> LoutSetCMYKColor" #
# ------------------------------------------------------------ #
# #
# See the Expert's Guide for the use of LoutSetRGBColor and #
# LoutSetCMYKColor rather than setrgbcolor and setcmykcolor. #
# #
# @ColourCommand also does the right thing for the PDF back end; #
# its result is always empty for the PlainText back end. #
# #
###########################################################################
def @ColourCommand right @Body
{
def @RGB right coords
{
@BackEnd @Case {
PostScript @Yield { coords "LoutSetRGBColor" }
PDF @Yield { coords "rg" coords "RG" }
PlainText @Yield ""
}
}
def @CMYK right coords
{
@BackEnd @Case {
PostScript @Yield { coords "LoutSetCMYKColor" }
PDF @Yield { coords "k" coords "K" }
PlainText @Yield ""
}
}
def @RGBElse right alt
{
{ "rgb" @Common @Body } @Case {
"rgb" @Yield @RGB { "rgb" @Rump @Body }
else @Yield alt
}
}
def @CMYKElse right alt
{
{ "cmyk" @Common @Body } @Case {
"cmyk" @Yield @CMYK { "cmyk" @Rump @Body }
else @Yield alt
}
}
def @NoChangeElse right alt
{
@Body @Case {
{ "nochange" "none" "" } @Yield ""
else @Yield alt
}
}
def @RGBCoords
{
@Body @Case {
black @Yield { 0.0 0.0 0.0 }
darkblue @Yield { 0.0 0.0 0.5 }
blue @Yield { 0.0 0.0 1.0 }
lightblue @Yield { 0.5 0.5 1.0 }
darkgreen @Yield { 0.0 0.5 0.0 }
green @Yield { 0.0 1.0 0.0 }
lightgreen @Yield { 0.5 1.0 0.5 }
darkred @Yield { 0.5 0.0 0.0 }
red @Yield { 1.0 0.0 0.0 }
lightred @Yield { 1.0 0.5 0.5 }
darkcyan @Yield { 0.0 0.5 0.5 }
cyan @Yield { 0.0 1.0 1.0 }
lightcyan @Yield { 0.5 1.0 1.0 }
darkmagenta @Yield { 0.5 0.0 0.5 }
magenta @Yield { 1.0 0.0 1.0 }
lightmagenta @Yield { 1.0 0.5 1.0 }
darkyellow @Yield { 0.5 0.5 0.0 }
yellow @Yield { 1.0 1.0 0.0 }
lightyellow @Yield { 1.0 1.0 0.5 }
darkgray @Yield { 0.2 0.2 0.2 }
gray @Yield { 0.5 0.5 0.5 }
lightgray @Yield { 0.8 0.8 0.8 }
darkgrey @Yield { 0.2 0.2 0.2 }
grey @Yield { 0.5 0.5 0.5 }
lightgrey @Yield { 0.8 0.8 0.8 }
white @Yield { 1.0 1.0 1.0 }
}
}
@RGBElse @CMYKElse @NoChangeElse @RGB @RGBCoords
}
###########################################################################
# #
# @TextureCommand #
# #
# @TextureCommand converts a texture expressed in a manner that the #
# ordinary user can comprehend into the PostScript texture dictionary #
# needed to obtain that texture, suitable for passing to @SetTexture #
# or including in the left parameter of @Graphic. #
# #
###########################################################################
def @TextureCommand
left type
named scale { 1 }
named hscale { 1 }
named vscale { 1 }
import @PSLengths named angle { 0d }
import @PSLengths named hshift { 0i }
import @PSLengths named vshift { 0i }
import @PSLengths named width { "dft" }
import @PSLengths named height { "dft" }
import @PSLengths named gap { "dft" }
import @PSLengths named radius { "dft" }
import @PSLengths named linewidth { "dft" }
named font { "dft" }
import @PSLengths named size { "dft" }
named value { "dft" }
{
def @Dft left x right y
{
y @Case {
"dft" @Yield x
else @Yield y
}
}
def @SolidTexture
{
"null LoutSetTexture"
}
def @StripedTexture
{
def @Width { "1 pt" @Dft width }
def @Gap { "1 pt" @Dft gap }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Width @Gap "add dup ]"
@Width @Gap "add dup"
"{"
"pop 0 0 moveto"
@Width @Gap "add 0 lineto"
"0" @Width "rlineto"
"0" @Width "lineto"
"closepath fill"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @GridTexture
{
def @Width { "1 pt" @Dft width }
def @Gap { "1 pt" @Dft gap }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Width @Gap "add dup ]"
@Width @Gap "add dup"
"{"
"pop 0 0 moveto"
@Width @Gap "add 0 lineto"
"0" @Width "rlineto"
@Gap "neg 0 rlineto"
"0" @Gap "rlineto"
@Width "neg 0 rlineto"
"closepath fill"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @DottedTexture
{
def @Radius { "0.5 pt" @Dft radius }
def @Gap { "2 pt" @Dft gap }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Gap "dup ]"
@Gap "dup"
"{"
"pop" @Gap "2 div dup" @Radius "0 360 arc fill"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @ChessboardTexture
{
def @Width { "2 pt" @Dft width }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Width "2 mul dup ]"
@Width "2 mul dup"
"{"
"pop 0 0 moveto"
@Width "0 rlineto"
"0" @Width "rlineto"
@Width "neg 0 rlineto"
closepath
@Width @Width "moveto"
@Width "0 rlineto"
"0" @Width "rlineto"
@Width "neg 0 rlineto"
"closepath fill"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @BrickworkTexture
{
def @Width { "6 pt" @Dft width }
def @Height { "2 pt" @Dft height }
def @Linewidth { "0.5 pt" @Dft linewidth }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Width @Height "2 mul ]"
@Width @Height "2 mul"
"{"
"pop 0 0 moveto" @Width "0 rlineto"
"0" @Height "moveto" @Width "0 rlineto"
"0" @Height "2 mul moveto" @Width "0 rlineto"
"0 0 moveto 0" @Height "rlineto"
@Width "0 moveto 0" @Height "rlineto"
@Width "2 div" @Height "moveto 0" @Height "rlineto"
"[] 0 setdash" @Linewidth "setlinewidth stroke"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @HoneycombTexture
{
def @R { "2.0 pt" @Dft radius }
def @Linewidth { "0.5 pt" @Dft linewidth }
def @X { @R "0.5 mul" }
def @Y { @R "0.886 mul" }
def @NegX { @X "neg" }
def @NegY { @Y "neg" }
def @NegR { @R "neg" }
def @BoxWidth { @R @X "add 2 mul" }
def @BoxHeight { @Y "2 mul" }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @BoxWidth @BoxHeight "]"
@BoxWidth @BoxHeight
"{"
"pop"
@X "0 moveto"
@R "0 rlineto"
@X @Y "rlineto"
@R "0 rlineto"
@NegR "0 rlineto"
@NegX @Y "rlineto"
@NegR "0 rlineto"
@NegX @NegY "rlineto"
"closepath"
"[] 0 setdash" @Linewidth "setlinewidth stroke"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @TriangularTexture
{
def @R { "4.0 pt" @Dft radius }
def @Linewidth { "0.5 pt" @Dft linewidth }
def @X { @R "0.5 mul" }
def @Y { @R "0.886 mul" }
def @BoxWidth { @R }
def @BoxHeight { @Y "2 mul" }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @BoxWidth @BoxHeight "]"
@BoxWidth @BoxHeight
"{"
"pop"
"0 0 moveto"
@R "0 lineto"
"0" @Y "2 mul lineto"
@R "0 rlineto"
"closepath"
"0" @Y "moveto"
@R "0 rlineto"
"[] 0 setdash" @Linewidth "setlinewidth stroke"
"}"
"LoutMakeTexture LoutSetTexture"
}
def @StringTexture
{
def @Width { "12 pt" @Dft width }
def @Height { "12 pt" @Dft height }
def @Font { "Times-Roman" @Dft font }
def @Size { "10 pt" @Dft size }
def @Value { "*" @Dft value }
scale hscale vscale angle hshift vshift
"2"
"[ 0 0" @Width @Height "]"
@Width @Height
"{"
"pop /"@Font "findfont" @Size "scalefont setfont"
"("@Value") dup false 0 0 moveto charpath flattenpath"
"pathbbox pop pop neg exch neg exch moveto show"
"}"
"LoutMakeTexture LoutSetTexture"
}
type @Case
{
"solid" @Yield @SolidTexture
"striped" @Yield @StripedTexture
"grid" @Yield @GridTexture
"dotted" @Yield @DottedTexture
"chessboard" @Yield @ChessboardTexture
"brickwork" @Yield @BrickworkTexture
"honeycomb" @Yield @HoneycombTexture
"triangular" @Yield @TriangularTexture
"string" @Yield @StringTexture
else @Yield type
}
}
###########################################################################
# #
# @TextureImport #
# #
# Used as an import for texture options. #
# #
# We cleverly replace @Texture by nothing inside those options, #
# and replace the known types by themselves plus @TextureCommand. #
# This allows the user to type #
# #
# texture { striped } #
# texture { striped @Texture } #
# texture { striped angle { 45d } } #
# texture { striped @Texture angle { 45d } } #
# #
# and it all winds up being a call to @TextureCommand. #
# #
###########################################################################
export
solid
striped
grid
dotted
chessboard
brickwork
honeycomb
triangular
string
@Texture
def @TextureImport
{
macro solid { "solid" @TextureCommand }
macro striped { "striped" @TextureCommand }
macro grid { "grid" @TextureCommand }
macro dotted { "dotted" @TextureCommand }
macro chessboard { "chessboard" @TextureCommand }
macro brickwork { "brickwork" @TextureCommand }
macro honeycomb { "honeycomb" @TextureCommand }
macro triangular { "triangular" @TextureCommand }
macro string { "string" @TextureCommand }
macro @Texture { }
}
|
