distort-stl: introduce $gensplit (nfc)

[reprap-play.git] / distort-stl

diff --git a/distort-stl b/distort-stl
index 722e4faf6c2c750152b846a1ca1f1f7fc0d6a106..9d8569062b193e10413a3c91e643feeed4f633b9 100755 (executable)
--- a/distort-stl
+++ b/distort-stl
@@ -32,6 +32,14 @@ use Data::Dumper;
 
 sub TAU () { M_PI * 2; }
 
+our $debug = $ENV{DISTORT_DEBUG};
+
+my $ps = $ENV{DISTORT_PS};
+if ($ps) {
+    open PS, "> $ps" or die $!;
+    print PS "%!\n";
+}
+
 our $fa = 10;
 
 our $triangles;
@@ -47,6 +55,22 @@ sub shift_arg () {
 sub sprintf_triangle ($) {
     my ($t) = @_;
 
+    return '' unless $debug;
+
+    if ($ps && $t->[3] =~ m/$ENV{DISTORT_PS_RE}/) {
+       printf PS <<'END',
+ %20.16g %20.16g %20.16g moveto
+ %20.16g %20.16g %20.16g lineto
+ %20.16g %20.16g %20.16g lineto
+ closepath stroke
+END
+               $t->[0][0], $t->[0][1], $t->[0][2],
+               $t->[1][0], $t->[1][1], $t->[1][2],
+               $t->[2][0], $t->[2][1], $t->[2][2],
+               or die $!;
+       flush PS or die $!;
+    }
+
     sprintf
        "%11.6f,%11.6f,%11.6f / ".
        "%11.6f,%11.6f,%11.6f / ".
@@ -60,7 +84,7 @@ sub sprintf_triangle ($) {
 sub maybe_subdivide_triangle ($$$$) {
     my ($t, $ok, $changed, $edge_need_subdivide_fn) = @_;
 
-    print STDERR sprintf_triangle $t;
+    print STDERR sprintf_triangle $t if $debug;
     
     foreach my $ix (0..2) {
        my $jx = ($ix+1) % 3;
@@ -68,27 +92,37 @@ sub maybe_subdivide_triangle ($$$$) {
        if ($edge_need_subdivide_fn->($t->[$ix], $t->[$jx])) {
            printf STDERR
                " S i=%d j=%d k=%d ",
-               $ix, $jx, $kx;
+               $ix, $jx, $kx
+               if $debug;
            my @midp;
            foreach my $ci (0..2) {
                push @midp, 0.5 * ($t->[$ix][$ci] + $t->[$jx][$ci]);
            }
-           # triangle i-j-k, splitting edge i-m
-           # gives    i-m-k, k-m-j
-           my $n = [ @$t ]; $n->[$ix] = \@midp;  $n->[3] = "$t->[3]a$ix$jx";
-           unshift @$changed, $n;
 
-           my $n = [ @$t ]; $n->[$jx] = \@midp;  $n->[3] = "$t->[3]b$ix$jx";
-           unshift @$changed, $n;
            printf STDERR
                " midp %11.6f,%11.6f,%11.6f\n",
-               @midp;
+               @midp
+               if $debug;
+
+           # triangle i-j-k, splitting edge i-m
+           # gives    i-m-k, k-m-j
+           my $gensplit = sub {
+               my ($ixjx, $xwhat) = @_;
+               my $n = [ @$t ];
+               $n->[$ixjx] = \@midp;
+               $n->[3] = "$t->[3]$xwhat";
+               printf STDERR "%s\n", sprintf_triangle $n if $debug;
+               unshift @$changed, $n;
+           };
+           $gensplit->($ix, "a$ix$jx");
+           $gensplit->($jx, "b$ix$jx");
            return;
        }
     }
     push @$ok, $t;
     printf STDERR "OK nok=%d nchanged=%d\n",
-       (scalar @$ok), (scalar @$changed);
+       (scalar @$ok), (scalar @$changed)
+       if $debug;
 }
 
 sub maybe_subdivide ($) {