sleepphone-cable-box: introduce wall_bot, nfc

[reprap-play.git] / lemon-stand.scad.pl

diff --git a/lemon-stand.scad.pl b/lemon-stand.scad.pl
index eae50b538b554d93eb5b0c3524e90f1b3a30fe0e..8c1d10f54338529a21998c8656a3db2ba2fdaa25 100755 (executable)
--- a/lemon-stand.scad.pl
+++ b/lemon-stand.scad.pl
@@ -7,16 +7,26 @@ use IO::File;
 use Data::Dumper;
 use constant tau => pi*2;
 
+my $ellipse = 25 / 2;
+my $circle = 7 / 2;
+my $channelh = 3;
+my $channelw = 4;
+my $xscale = 35 / 25;
+my $N = 180; # around ellipse
+my $M = 80; # around each circle
+my @channeldistprops = (0, 1/3, 2/3);
+
+my $NMdiv = $ENV{'LEMONSTAND_COARSE'} || 1;
+
+$M /= $NMdiv;
+$N /= $NMdiv;
+
 print <<END;
 // -*- C -*-
 // *** AUTOGENERATED - DO NOT EDIT ***
 END
 
-my $ellipse = 20;
-my $circle = 6;
-my $xscale = 2;
-my $N = 30; # around ellipse
-my $M = 20; # around each circle
+print "torusyup = ", ($circle / sqrt(2)), ";\n";
 
 our @ellipse = map {
     my $theta = tau * $_ / $N;
@@ -42,7 +52,10 @@ our @circles = map {
     } 0..($M-1) ];
 } 0..($N-1);
 
-sub circle ($$$) { my ($c,$i,$j) = @_; $c->[ $i % $N ][ $j % $M ]; }
+sub scadvec ($) {
+    my ($v) = @_;
+    return "[ ".(join ", ", @$v)." ]"
+}
 
 sub torusy () {
     print "module Torusy(){ polyhedron(points=[";
@@ -52,7 +65,7 @@ sub torusy () {
        foreach my $j (0..$M-1) {
            print "," if $ptix;
            print "\n";
-           print "    [ ", (join ", ", @{ $circles[$i][$j] }), " ]";
+           print "    ",(scadvec $circles[$i][$j]);
            $cirpt[$i][$j] = $ptix++;
        }
     }
@@ -82,10 +95,70 @@ sub torusy () {
 
 torusy();
 
+
+our @distances;
+push @distances, 0;
+foreach my $i (1..$N) {
+    my $dist = $distances[ $i-1 ];
+    $dist += abs($ellipse[$i % $N] - $ellipse[$i-1]);
+    $distances[$i] = $dist;
+}
+
+sub infodistprop ($) {
+    my ($distprop) = @_;
+    # returns
+    #   ( $ellipse_centreline_point,
+    #     $along_vector )
+    my $dist = $distprop * $distances[$N];
+    foreach my $i (0..$N-1) {
+       my $prorata =
+           ($dist - $distances[$i]) /
+           ($distances[$i+1] - $distances[$i]);
+       next unless 0 <= $prorata && $prorata <= 1;
+       print "// infodistprop $distprop => #$i=$ellipse[$i] $prorata $ellipse[$i+1]\n";
+       return (
+               (1-$prorata) * $ellipse[$i] + ($prorata) * $ellipse[$i+1],
+               $alongs[$i],
+              );
+    }
+    die "$distprop ?";
+}
+
+sub channels(){
+    print "module Channels(){\n";
+    
+    foreach my $cdp (
+                    (map { 0.5 *  $_    } @channeldistprops),
+                    (map { 0.5 * ($_+1) } @channeldistprops),
+                   ) {
+       my ($ctr, $along) = infodistprop($cdp);
+       my $angle = atan2(-$along->[0], $along->[1]);
+       print "  translate(",scadvec($ctr),")\n";
+       print "  rotate([0,0,$angle*360/",tau,"])\n";
+       print "  rotate([0,90,0])\n";
+       print "  translate([0,0, -2*$circle])\n";
+       print "  scale([1, $channelw/$channelh/2, 1])\n";
+       print "  rotate([0,0,360/8/2])\n";
+       print "  cylinder(r=$channelh, h=4*$circle, \$fn=8);\n";
+    }
+    print "}\n";
+}
+
+channels();
+
 while (<DATA>) { print };
 
 STDOUT->error and die $!;
 STDOUT->flush or die $!;
 
 __DATA__
-Torusy();
+module Stand(){
+    difference(){
+       translate([0,0,torusyup])
+           Torusy();
+       Channels();
+       translate([-200,-200,-50])
+           cube([400,400,50]);
+    }
+}
+Stand();