[37] | 1 | %%BeginProlog |
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| 2 | 50 dict begin |
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| 3 | |
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| 4 | % This is a standard prolog for Postscript generated by Tk's canvas |
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| 5 | % widget. |
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| 6 | % RCS: @(#) $Id: prolog.ps,v 1.2 1999/04/16 01:51:09 stanton Exp $ |
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| 7 | |
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| 8 | % The definitions below just define all of the variables used in |
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| 9 | % any of the procedures here. This is needed for obscure reasons |
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| 10 | % explained on p. 716 of the Postscript manual (Section H.2.7, |
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| 11 | % "Initializing Variables," in the section on Encapsulated Postscript). |
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| 12 | |
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| 13 | /baseline 0 def |
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| 14 | /stipimage 0 def |
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| 15 | /height 0 def |
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| 16 | /justify 0 def |
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| 17 | /lineLength 0 def |
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| 18 | /spacing 0 def |
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| 19 | /stipple 0 def |
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| 20 | /strings 0 def |
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| 21 | /xoffset 0 def |
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| 22 | /yoffset 0 def |
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| 23 | /tmpstip null def |
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| 24 | |
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| 25 | % Define the array ISOLatin1Encoding (which specifies how characters are |
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| 26 | % encoded for ISO-8859-1 fonts), if it isn't already present (Postscript |
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| 27 | % level 2 is supposed to define it, but level 1 doesn't). |
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| 28 | |
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| 29 | systemdict /ISOLatin1Encoding known not { |
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| 30 | /ISOLatin1Encoding [ |
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| 31 | /space /space /space /space /space /space /space /space |
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| 32 | /space /space /space /space /space /space /space /space |
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| 33 | /space /space /space /space /space /space /space /space |
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| 34 | /space /space /space /space /space /space /space /space |
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| 35 | /space /exclam /quotedbl /numbersign /dollar /percent /ampersand |
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| 36 | /quoteright |
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| 37 | /parenleft /parenright /asterisk /plus /comma /minus /period /slash |
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| 38 | /zero /one /two /three /four /five /six /seven |
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| 39 | /eight /nine /colon /semicolon /less /equal /greater /question |
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| 40 | /at /A /B /C /D /E /F /G |
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| 41 | /H /I /J /K /L /M /N /O |
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| 42 | /P /Q /R /S /T /U /V /W |
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| 43 | /X /Y /Z /bracketleft /backslash /bracketright /asciicircum /underscore |
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| 44 | /quoteleft /a /b /c /d /e /f /g |
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| 45 | /h /i /j /k /l /m /n /o |
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| 46 | /p /q /r /s /t /u /v /w |
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| 47 | /x /y /z /braceleft /bar /braceright /asciitilde /space |
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| 48 | /space /space /space /space /space /space /space /space |
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| 49 | /space /space /space /space /space /space /space /space |
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| 50 | /dotlessi /grave /acute /circumflex /tilde /macron /breve /dotaccent |
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| 51 | /dieresis /space /ring /cedilla /space /hungarumlaut /ogonek /caron |
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| 52 | /space /exclamdown /cent /sterling /currency /yen /brokenbar /section |
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| 53 | /dieresis /copyright /ordfeminine /guillemotleft /logicalnot /hyphen |
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| 54 | /registered /macron |
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| 55 | /degree /plusminus /twosuperior /threesuperior /acute /mu /paragraph |
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| 56 | /periodcentered |
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| 57 | /cedillar /onesuperior /ordmasculine /guillemotright /onequarter |
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| 58 | /onehalf /threequarters /questiondown |
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| 59 | /Agrave /Aacute /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla |
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| 60 | /Egrave /Eacute /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex |
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| 61 | /Idieresis |
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| 62 | /Eth /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply |
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| 63 | /Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute /Thorn |
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| 64 | /germandbls |
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| 65 | /agrave /aacute /acircumflex /atilde /adieresis /aring /ae /ccedilla |
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| 66 | /egrave /eacute /ecircumflex /edieresis /igrave /iacute /icircumflex |
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| 67 | /idieresis |
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| 68 | /eth /ntilde /ograve /oacute /ocircumflex /otilde /odieresis /divide |
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| 69 | /oslash /ugrave /uacute /ucircumflex /udieresis /yacute /thorn |
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| 70 | /ydieresis |
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| 71 | ] def |
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| 72 | } if |
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| 73 | |
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| 74 | % font ISOEncode font |
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| 75 | % This procedure changes the encoding of a font from the default |
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| 76 | % Postscript encoding to ISOLatin1. It's typically invoked just |
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| 77 | % before invoking "setfont". The body of this procedure comes from |
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| 78 | % Section 5.6.1 of the Postscript book. |
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| 79 | |
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| 80 | /ISOEncode { |
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| 81 | dup length dict begin |
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| 82 | {1 index /FID ne {def} {pop pop} ifelse} forall |
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| 83 | /Encoding ISOLatin1Encoding def |
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| 84 | currentdict |
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| 85 | end |
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| 86 | |
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| 87 | % I'm not sure why it's necessary to use "definefont" on this new |
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| 88 | % font, but it seems to be important; just use the name "Temporary" |
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| 89 | % for the font. |
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| 90 | |
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| 91 | /Temporary exch definefont |
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| 92 | } bind def |
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| 93 | |
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| 94 | % StrokeClip |
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| 95 | % |
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| 96 | % This procedure converts the current path into a clip area under |
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| 97 | % the assumption of stroking. It's a bit tricky because some Postscript |
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| 98 | % interpreters get errors during strokepath for dashed lines. If |
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| 99 | % this happens then turn off dashes and try again. |
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| 100 | |
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| 101 | /StrokeClip { |
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| 102 | {strokepath} stopped { |
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| 103 | (This Postscript printer gets limitcheck overflows when) = |
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| 104 | (stippling dashed lines; lines will be printed solid instead.) = |
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| 105 | [] 0 setdash strokepath} if |
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| 106 | clip |
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| 107 | } bind def |
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| 108 | |
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| 109 | % desiredSize EvenPixels closestSize |
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| 110 | % |
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| 111 | % The procedure below is used for stippling. Given the optimal size |
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| 112 | % of a dot in a stipple pattern in the current user coordinate system, |
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| 113 | % compute the closest size that is an exact multiple of the device's |
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| 114 | % pixel size. This allows stipple patterns to be displayed without |
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| 115 | % aliasing effects. |
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| 116 | |
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| 117 | /EvenPixels { |
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| 118 | % Compute exact number of device pixels per stipple dot. |
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| 119 | dup 0 matrix currentmatrix dtransform |
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| 120 | dup mul exch dup mul add sqrt |
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| 121 | |
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| 122 | % Round to an integer, make sure the number is at least 1, and compute |
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| 123 | % user coord distance corresponding to this. |
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| 124 | dup round dup 1 lt {pop 1} if |
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| 125 | exch div mul |
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| 126 | } bind def |
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| 127 | |
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| 128 | % width height string StippleFill -- |
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| 129 | % |
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| 130 | % Given a path already set up and a clipping region generated from |
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| 131 | % it, this procedure will fill the clipping region with a stipple |
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| 132 | % pattern. "String" contains a proper image description of the |
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| 133 | % stipple pattern and "width" and "height" give its dimensions. Each |
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| 134 | % stipple dot is assumed to be about one unit across in the current |
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| 135 | % user coordinate system. This procedure trashes the graphics state. |
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| 136 | |
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| 137 | /StippleFill { |
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| 138 | % The following code is needed to work around a NeWSprint bug. |
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| 139 | |
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| 140 | /tmpstip 1 index def |
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| 141 | |
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| 142 | % Change the scaling so that one user unit in user coordinates |
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| 143 | % corresponds to the size of one stipple dot. |
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| 144 | 1 EvenPixels dup scale |
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| 145 | |
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| 146 | % Compute the bounding box occupied by the path (which is now |
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| 147 | % the clipping region), and round the lower coordinates down |
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| 148 | % to the nearest starting point for the stipple pattern. Be |
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| 149 | % careful about negative numbers, since the rounding works |
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| 150 | % differently on them. |
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| 151 | |
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| 152 | pathbbox |
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| 153 | 4 2 roll |
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| 154 | 5 index div dup 0 lt {1 sub} if cvi 5 index mul 4 1 roll |
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| 155 | 6 index div dup 0 lt {1 sub} if cvi 6 index mul 3 2 roll |
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| 156 | |
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| 157 | % Stack now: width height string y1 y2 x1 x2 |
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| 158 | % Below is a doubly-nested for loop to iterate across this area |
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| 159 | % in units of the stipple pattern size, going up columns then |
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| 160 | % across rows, blasting out a stipple-pattern-sized rectangle at |
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| 161 | % each position |
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| 162 | |
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| 163 | 6 index exch { |
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| 164 | 2 index 5 index 3 index { |
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| 165 | % Stack now: width height string y1 y2 x y |
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| 166 | |
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| 167 | gsave |
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| 168 | 1 index exch translate |
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| 169 | 5 index 5 index true matrix tmpstip imagemask |
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| 170 | grestore |
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| 171 | } for |
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| 172 | pop |
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| 173 | } for |
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| 174 | pop pop pop pop pop |
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| 175 | } bind def |
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| 176 | |
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| 177 | % -- AdjustColor -- |
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| 178 | % Given a color value already set for output by the caller, adjusts |
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| 179 | % that value to a grayscale or mono value if requested by the CL |
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| 180 | % variable. |
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| 181 | |
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| 182 | /AdjustColor { |
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| 183 | CL 2 lt { |
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| 184 | currentgray |
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| 185 | CL 0 eq { |
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| 186 | .5 lt {0} {1} ifelse |
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| 187 | } if |
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| 188 | setgray |
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| 189 | } if |
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| 190 | } bind def |
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| 191 | |
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| 192 | % x y strings spacing xoffset yoffset justify stipple DrawText -- |
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| 193 | % This procedure does all of the real work of drawing text. The |
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| 194 | % color and font must already have been set by the caller, and the |
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| 195 | % following arguments must be on the stack: |
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| 196 | % |
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| 197 | % x, y - Coordinates at which to draw text. |
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| 198 | % strings - An array of strings, one for each line of the text item, |
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| 199 | % in order from top to bottom. |
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| 200 | % spacing - Spacing between lines. |
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| 201 | % xoffset - Horizontal offset for text bbox relative to x and y: 0 for |
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| 202 | % nw/w/sw anchor, -0.5 for n/center/s, and -1.0 for ne/e/se. |
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| 203 | % yoffset - Vertical offset for text bbox relative to x and y: 0 for |
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| 204 | % nw/n/ne anchor, +0.5 for w/center/e, and +1.0 for sw/s/se. |
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| 205 | % justify - 0 for left justification, 0.5 for center, 1 for right justify. |
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| 206 | % stipple - Boolean value indicating whether or not text is to be |
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| 207 | % drawn in stippled fashion. If text is stippled, |
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| 208 | % procedure StippleText must have been defined to call |
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| 209 | % StippleFill in the right way. |
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| 210 | % |
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| 211 | % Also, when this procedure is invoked, the color and font must already |
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| 212 | % have been set for the text. |
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| 213 | |
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| 214 | /DrawText { |
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| 215 | /stipple exch def |
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| 216 | /justify exch def |
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| 217 | /yoffset exch def |
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| 218 | /xoffset exch def |
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| 219 | /spacing exch def |
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| 220 | /strings exch def |
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| 221 | |
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| 222 | % First scan through all of the text to find the widest line. |
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| 223 | |
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| 224 | /lineLength 0 def |
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| 225 | strings { |
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| 226 | stringwidth pop |
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| 227 | dup lineLength gt {/lineLength exch def} {pop} ifelse |
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| 228 | newpath |
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| 229 | } forall |
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| 230 | |
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| 231 | % Compute the baseline offset and the actual font height. |
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| 232 | |
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| 233 | 0 0 moveto (TXygqPZ) false charpath |
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| 234 | pathbbox dup /baseline exch def |
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| 235 | exch pop exch sub /height exch def pop |
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| 236 | newpath |
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| 237 | |
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| 238 | % Translate coordinates first so that the origin is at the upper-left |
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| 239 | % corner of the text's bounding box. Remember that x and y for |
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| 240 | % positioning are still on the stack. |
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| 241 | |
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| 242 | translate |
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| 243 | lineLength xoffset mul |
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| 244 | strings length 1 sub spacing mul height add yoffset mul translate |
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| 245 | |
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| 246 | % Now use the baseline and justification information to translate so |
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| 247 | % that the origin is at the baseline and positioning point for the |
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| 248 | % first line of text. |
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| 249 | |
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| 250 | justify lineLength mul baseline neg translate |
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| 251 | |
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| 252 | % Iterate over each of the lines to output it. For each line, |
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| 253 | % compute its width again so it can be properly justified, then |
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| 254 | % display it. |
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| 255 | |
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| 256 | strings { |
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| 257 | dup stringwidth pop |
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| 258 | justify neg mul 0 moveto |
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| 259 | stipple { |
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| 260 | |
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| 261 | % The text is stippled, so turn it into a path and print |
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| 262 | % by calling StippledText, which in turn calls StippleFill. |
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| 263 | % Unfortunately, many Postscript interpreters will get |
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| 264 | % overflow errors if we try to do the whole string at |
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| 265 | % once, so do it a character at a time. |
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| 266 | |
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| 267 | gsave |
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| 268 | /char (X) def |
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| 269 | { |
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| 270 | char 0 3 -1 roll put |
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| 271 | currentpoint |
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| 272 | gsave |
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| 273 | char true charpath clip StippleText |
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| 274 | grestore |
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| 275 | char stringwidth translate |
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| 276 | moveto |
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| 277 | } forall |
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| 278 | grestore |
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| 279 | } {show} ifelse |
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| 280 | 0 spacing neg translate |
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| 281 | } forall |
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| 282 | } bind def |
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| 283 | |
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| 284 | %%EndProlog |
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