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#======================================================================
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# L I B C P T . P L
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# doc: Wed Nov 15 12:28:49 2000
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# dlm: Fri May 9 11:40:01 2008
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# (c) 2000 A.M. Thurnherr
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# uE-Info: 25 31 NIL 0 0 72 2 2 4 NIL ofnI
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#======================================================================
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# HISTORY:
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# Nov 15, 2000: - created
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# May 29, 2001: - made bg/fg numeric
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# May 31, 2001: - removed dummy bg val from all arrays
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# Dec 12, 2001: - clarified format errors
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# Jun 21, 2004: - relaxed cpt file format restrictions
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# - made cpt into a hash
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# - totally re-written
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# Jun 25, 2004: - return good value if $z equal upper cpt table limit
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# Jun 28, 2004: - added default color model
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# Jun 30, 2004: - renamed from libGMT.pl to libCPT.pl
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# Dec 1, 2005: - BUG: roundoff error
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# Jul 1, 2006: - Version 3.3 [HISTORY]
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# Jul 24, 2006: - modified to use $PRACTICALLY_ZERONY
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# Aug 16, 2006: - BUG: last level was returned on value < first level
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# May 9, 2008: - adapted to GMT 4.3 (see also IMPLEMENTATION NOTES
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# in [mkCPT])
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#----------------------------------------------------------------------
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# CPT File Parsing
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#----------------------------------------------------------------------
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# NB: %CPT structure assumes RGB --- if the color model is really HSV,
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# field names are wrong.
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# %CPT
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# levels number of different color levels
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# color_model RGB or HSV
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# @from_z from values (z, RGB) for each level
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# @from_R
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# @from_G
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# @from_B
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# @to_z to values (z, RGB) for each level
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# @to_R
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# @to_G
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# @to_B
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# bg_R background vals
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# bg_G
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# bg_B
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# fg_R foreground vals
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# fg_G
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# fg_B
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# nan_R nan vals
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# nan_G
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# nan_B
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sub readCPT($)
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{
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my($f) = @_;
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my($flag,%CPT);
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for ($CPT{levels}=0; <$f>;) {
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$CPT{color_model} = $' if /^# COLOR_MODEL = /; chomp($CPT{color_model});
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s/#.*//;
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next if /^\s*$/;
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my(@f) = split;
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if ($f[0] eq 'B') {
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$CPT{bg_R} = $f[1]; $CPT{bg_G} = $f[2]; $CPT{bg_B} = $f[3];
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} elsif ($f[0] eq 'F') {
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$CPT{bg_R} = $f[1]; $CPT{bg_G} = $f[2]; $CPT{bg_B} = $f[3];
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} elsif ($f[0] eq 'N') {
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$CPT{nan_R} = $f[1]; $CPT{nan_G} = $f[2]; $CPT{nan_B} = $f[3];
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} else {
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$CPT{from_z}[$CPT{levels}] = $f[0];
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$CPT{from_R}[$CPT{levels}] = $f[1];
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$CPT{from_G}[$CPT{levels}] = $f[2];
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$CPT{from_B}[$CPT{levels}] = $f[3];
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$CPT{to_z}[$CPT{levels}] = $f[4];
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$CPT{to_R}[$CPT{levels}] = $f[5];
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$CPT{to_G}[$CPT{levels}] = $f[6];
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$CPT{to_B}[$CPT{levels}] = $f[7];
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$CPT{levels}++;
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}
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}
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$CPT{color_model} = 'RGB' unless defined($CPT{color_model});
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croak("$0: color model $CPT{color_model} not implemented\n")
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unless ($CPT{color_model} =~ '\+?RGB' || $CPT{color_model} =~ '\+?HSV');
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return %CPT;
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}
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sub CPTlvl($%)
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{
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my($z,%CPT) = @_;
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my($l);
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croak("$0: no valid CPT info\n")
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unless ($CPT{levels} > 0);
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return nan if isnan($z);
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for ($l=0; $l<$CPT{levels}; $l++) {
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return $l if ($CPT{from_z}[$l] <= $z && $z < $CPT{to_z}[$l]);
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}
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return $CPT{levels}-1
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if (abs($z-$CPT{to_z}[$CPT{levels}-1]) < $PRACTICALLY_ZERO);
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return -1 if ($z < $CPT{from_z}[0]);
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return $CPT{levels};
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}
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1;
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