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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