4 use Math::Vector::Real;
15 my $slope_angle = 45 * TAU/360;
24 my $ballend_xr = $thick/2;
26 my @i_sections = qw(ball0 -6
39 my @j_sections = qw(lin0 2
50 my ($ip,$it, $jp,$jt) = @_;
52 my ($i_offset, $i_outward);
55 ($ip =~ m/0$/ ? -1 : +1),
58 my $i_thickscale = 1.0;
60 if ($ip =~ m/^lin[01]$/) {
61 $i_offset = V( -$lin_len * $it,
64 } elsif ($ip =~ m/^circle$/) {
65 $i_offset = V( 0,0,0 );
66 $i_outward = V( sin($it * TAU/2),
69 } elsif ($ip =~ m/^lin2$/) {
70 $i_offset = V( -$lin_len -$sine_len - $it*$lin2_len,
73 } elsif ($ip =~ m/^sine[01]$/) {
74 $i_offset = V( -$lin_len -$it*$sine_len,
76 $sine_height * ( 0.5 - 0.5*cos( $it*TAU/2 ) )
78 } elsif ($ip =~ m/^ball[02]$/) {
79 my $angle = $it * TAU/4;
80 $i_offset = V( -$lin_len -$sine_len
81 -($ip =~ m/2/ ? $lin2_len : 0)
82 -sin($angle) * $ballend_xr,
90 my $j_plus_th = $jp =~ m/2$/ ? $thick : 0;
92 my $i_thick = $thick * $i_thickscale;
93 my $j_p_x = $small_dia/2 + $thick;
94 my $j_rs_x = $large_dia/2 + $thick;
95 my $j_dqr_x = (1-cos($slope_angle)) * $jcurverad;
96 my $j_q_x = $j_rs_x - $j_dqr_x;
97 my $j_dpq = ($j_q_x - $j_p_x) / asin($slope_angle);
98 #print STDERR "($j_q_x - $j_p_x) / asin($slope_angle); => $j_dpq\n";
100 my $j_q_y = $j_p_y + $j_dpq * cos($slope_angle);
101 my $j_r_y = $j_q_y + sin($slope_angle) * $jcurverad;
103 my $j_qrc_x = $j_rs_x - $jcurverad;
104 my $j_qrc_y = $j_r_y;
109 if ($jp =~ m/^curveE$/) {
110 my $angle = ($jt + 1) * TAU/2 - $slope_angle;
111 $j_x = $j_p_x + $i_thick/2 * cos($angle);
112 $j_y = $j_p_y + $i_thick/2 * sin($angle);
113 } elsif ($jp =~ m/^curve[12]$/) {
114 my $angle = $slope_angle * $jt;
115 my $outwards = $jp =~ m/1/ ? -1 : +1;
116 $j_x = $j_qrc_x + cos($angle) * ($jcurverad + $outwards * $i_thick/2);
117 $j_y = $j_qrc_y - sin($angle) * ($jcurverad + $outwards * $i_thick/2);
118 } elsif ($jp =~ m/^lin0$/) {
119 $j_x = $j_rs_x + $i_thick * (+0.5 - $jt);
125 # print STDERR "@_ $j_x $j_y $i_offset $i_outward\n";
132 sub get_sections_ptvals {
135 while (my $name = shift @_) {
137 push @out, $last_ptval;
139 my $count = shift @_;
140 my $neg = sub { $_[0] };
143 $neg = sub { 1- $_[0] };
145 foreach (my $ix = 0; $ix < $count; $ix++) {
146 push @out, [ $name, $neg->($ix/$count) ];
148 $last_ptval = [ $name, $neg->(1.0) ];
160 foreach my $pval (@_) {
161 my $pix = $point_indices{$pval}
162 //= ((push @points, $pval), $#points);
163 return if grep { $pix eq $_ } @pixs;
166 push @triangles, \@pixs;
170 my @ipts = get_sections_ptvals(@i_sections);
171 my @jpts = get_sections_ptvals(@j_sections);
173 foreach my $ipt (@ipts) {
175 foreach my $jpt (@jpts) {
176 push @row, &point(@$ipt, @$jpt);
180 foreach (my $qi=0; $qi<$#ipts; $qi++) { # i direction does not wrap
182 foreach (my $qj=0; $qj<@jpts; $qj++) { # j direction does wrap
183 my $qj2 = ($qj+1) % @jpts;
184 my $p0 = $sheet[$qi][$qj];
185 triangle($p0, $sheet[$qi2][$qj], $sheet[$qi2][$qj2]);
186 triangle($p0, $sheet[$qi2][$qj2], $sheet[$qi][$qj2]);
193 return "[".(join ',', @$v)."]";
197 print "polyhedron(points=[\n" or die $!;
198 print pv($_),",\n" or die $! foreach @points;
199 print "],faces=[\n" or die $!;
200 print pv($_),",\n" or die $! foreach @triangles;
201 print "],convexity=10);\n" or die $!;