overflow-tube: Add cover up instruction (introduce var)

[quacks.git] / Quacks.pm

diff --git a/Quacks.pm b/Quacks.pm
index cc80f703feb1b30649efdaa41eb38741b8c743df..b4b06dcf12965bcabd7c4e7613f494c884d7ec99 100644 (file)
--- a/Quacks.pm
+++ b/Quacks.pm
@@ -11,6 +11,13 @@ use Exporter qw(import);
 our @EXPORT = qw(
 
  $pumpkin $green $red $blue $yellow $moth $purple $lotus $white
+ $anychip $black colour
+
+ $ps_framing
+
+ $page_pre ps_start
+
+ arrow_any chip ruby
 
               );
 
@@ -23,3 +30,136 @@ our $moth    = [" 0  0  0", "1 1 1"];
 our $purple  = ["145/44/238", "0 0 0"];
 our $lotus   = [("0/245/255",) x 2];
 our $white   = ["1  1   1", "0 0 0"];
+
+sub colour ($) {
+  my ($c) = @_;
+  if ($c =~ m{^(\d+)/(\d+)/(\d+)$}) {
+    return (join ' ', map { $_ / 255.0 } ($1,$2,$3)).' setrgbcolor';
+  } elsif ($c =~ m/[^ 0-9.]/) {
+    return $c;
+  } elsif ($c =~ m/^\s*\S+\s*$/) {
+    return "$c setgray";
+  } elsif ($c =~ m/./) {
+    return "$c setrgbcolor";
+  } else {
+    return '';
+  }
+}
+
+our $anychip = ['0.8', '0'];
+our $black = colour('0');
+
+our $page_pre;
+
+our $ps_framing = '';
+
+sub arrow_any ($) { <<END;
+  $black 1 setlinewidth
+    newpath
+       $_[0]
+       arrowlen 0 moveto
+       arrowhead dup neg exch  rmoveto
+       arrowhead dup neg       rlineto
+       arrowhead neg dup       rlineto
+       stroke
+END
+};
+
+sub chip ($$) {
+  my ($cary, $pips) = @_; # put in a gsave translate
+  my $o = <<END;
+  newpath
+  0 0 chip 0.5 mul 0 360 arc
+  gsave 1 setlinewidth $black stroke grestore
+  ${\ colour($cary->[0]) } fill
+END
+  if ($pips) {
+    $o .= <<END;
+  ${\ colour($cary->[1]) }
+END
+  }
+  my $spot = sub {
+    my ($x,$y) = @_;
+    $o .= <<END;
+    newpath
+    spot 0.5 sqrt mul 1.1 mul dup
+    $x mul exch $y mul
+    spot 0.5 mul
+    0 360 arc fill
+END
+  };
+
+  $spot->( 0, 0) if $pips & 1;
+  $spot->(-1,-1) if $pips & 6;
+  $spot->(+1,+1) if $pips & 6;
+  $spot->(-1,+1) if $pips & 4;
+  $spot->(+1,-1) if $pips & 4;
+
+  $o;
+}
+
+sub ruby () { # put in gsave translate
+  <<END;
+  newpath
+    rubysz neg  0 moveto
+    0  rubysz neg lineto
+    rubysz      0 lineto
+    0      rubysz lineto
+    closepath
+    ${\ colour('1 .2 .2') } gsave fill grestore
+    $black 1 setlinewidth stroke
+END
+}
+
+sub ps_start (;$) {
+  my ($adj) = @_;
+  $adj //= '';
+
+  $page_pre = <<END;
+72 25.4 div dup scale
+%210 0 translate
+%90 rotate
+$adj
+END
+
+  $ps_framing .= <<END;
+%!
+
+$page_pre
+
+/tw 57.5 def
+/th 73 def
+/bdiag 5 def
+/thirdlineh 0.45 def
+/costcirch 0.3 def
+/chip 15 def
+/spot 3.5 def
+/arrowlen 6 def
+/arrowhead 3 def
+/putback_len 10 def
+
+/costtexth 0.215 def
+/costtextsz 12 def
+/costtextdx -0.03 def
+/costfont /Heletica-BoldOblique findfont costtextsz scalefont def
+
+/rubysz 4 def
+
+% diagonal conversion
+/dc {                    % xprop yprop
+    dup th mul           % xprop yprop y
+    3 1 roll             % y xprop yprop
+    bdiag mul neg        % y xprop x-margin-at-this-height
+    tw add               % y xprop x-width-at-this-height
+    exch mul             % y x-width-at-this-height xprop
+    exch                 % x y
+} def
+
+/arrow {
+  ${\ arrow_any("0 0 moveto  arrowlen 0 rlineto") }
+} def
+
+END
+}
+
+1;