X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=wardrobe-hook.scad;h=d7c070c788278965b9fabc961610d2338ef7aa9e;hp=7e2697698112bfb4a73823a2c221cdbb3cdb3d51;hb=bd06849c442d97cd951fe11ebdf0341944f80629;hpb=c1b245c859354fbb1d1da483babb82f8674d2d41

diff --git a/wardrobe-hook.scad b/wardrobe-hook.scad
index 7e26976..d7c070c 100644
--- a/wardrobe-hook.scad
+++ b/wardrobe-hook.scad
@@ -33,7 +33,7 @@ mainthick = 4;
 clipthick = 2;
 clipang = 135;
 
-$stemlen = 40;
+stemlen = 40;
 
 topwidth = 20;
 
@@ -42,55 +42,43 @@ hookcurl = 60;
 hookwidth = 4;
 
 tuberad = tubewidth/2;
+bend = atan(tuberad/stemlen);
 mainoutrad = tuberad + mainthick;
 hookoutrad = hookinrad + hookwidth;
-$hookcy = -($stemlen - hookoutrad);
+hookcy = -(stemlen - hookoutrad);
 
-$eltop = [topwidth/2, -tuberad + tubeheight + mainthick + 0.1];
-$elmid = [topwidth/2, -tuberad];
-$ellow = tangent_intersect_b([0,$hookcy], hookinrad, $elmid);
-$ellowextra = 180 - tangent_intersect_beta([0,$hookcy], hookinrad, $elmid);
+eltop = [topwidth/2, -tuberad + tubeheight + mainthick + 0.1];
+elmid = [topwidth/2, -tuberad];
+ellow = tangent_intersect_b([0,hookcy], hookinrad, elmid);
+ellowextra = 180 - tangent_intersect_beta([0,hookcy], hookinrad, elmid);
 
-$bend = 0;
-
-module Howly(acrossly_x, frontbackly_x){
-  if (acrossly_x >= 0) {
-    translate([acrossly_x,0,0])
-      assign($bend = atan(tuberad/$stemlen),
-	     $frontbackly = 0)
-      child();
-  }
-  if (frontbackly_x >= 0) {
-    translate([frontbackly_x,0,0])
-      assign($bend = 0,
-	     $frontbackly = 1)
-      child();
-  }
-}
-
-module Plan(){
+module ClipPlan(qbend, qstemleny){
   dy = tubeheight - tuberad*2;
   FArcSegment(0, dy, tuberad, mainoutrad, -1, 181);
-  FArcSegment(0, 0,  tuberad, mainoutrad, -$bend, $bend+1);
+  FArcSegment(0, 0,  tuberad, mainoutrad, -qbend, qbend+1);
   translate([tuberad, 0]) square(center=false, size=[mainthick,dy]);
   FArcSegment(0, 0, tuberad, tuberad + clipthick, 360-clipang, clipang+1);
-  rotate(-$bend) translate([tuberad, 0]) mirror([0,1])
-    square(center=false, size=[mainthick, $stemlen/cos($bend)]);
+  rotate(-qbend) translate([tuberad, 0]) mirror([0,1])
+    square(center=false, size=[mainthick, qstemleny/cos(qbend)]);
+}
+
+module Plan(){
+  ClipPlan(bend,stemlen);
 }
 
 module ElevationCore(){
-  FArcSegment(0, $hookcy, hookinrad, hookoutrad,
-	      180 - $ellowextra,
-	      90 + hookcurl + $ellowextra);
+  FArcSegment(0, hookcy, hookinrad, hookoutrad,
+	      180 - ellowextra,
+	      90 + hookcurl + ellowextra);
   translate([-hookoutrad*sqrt(0.5),
-	      $hookcy - hookoutrad*sqrt(0.5) + 0.1])
+	      hookcy - hookoutrad*sqrt(0.5) + 0.1])
     mirror([1,0])
-    square(center=false, size=[topwidth, $stemlen + tubeheight + 20]);
-  polygon([[-hookoutrad, $ellow[1]],
-	   reflect_in_y($eltop),
-	   $eltop,
-	   $elmid,
-	   $ellow]);
+    square(center=false, size=[topwidth, stemlen + tubeheight + 20]);
+  polygon([[-hookoutrad, ellow[1]],
+	   reflect_in_y(eltop),
+	   eltop,
+	   elmid,
+	   ellow]);
 }
 
 // after here is all 3D
@@ -110,13 +98,13 @@ module PlaneAbove(){
   translate([-100,-100,0]) cube(center=false,size=[200,200,200]);
 }
 
-taperangle = -270 + tangent_intersect_beta([-$hookcy, 0],
+taperangle = -270 + tangent_intersect_beta([-hookcy, 0],
 					  hookoutrad,
-					  [-$eltop[1], -$eltop[0]]);
-module Hook(){ ////toplevel
+					  [-eltop[1], -eltop[0]]);
+module HookL(){ ////toplevel
   difference(){
     rotate([taperangle,0,0])
-      translate([0,-$eltop[1],0])
+      translate([0,-eltop[1],0])
       Primary();
     translate([0,0,topwidth/2])
       rotate([taperangle*2,0,0])
@@ -126,17 +114,101 @@ module Hook(){ ////toplevel
   }
 }
 
-module RightHook(){ ////toplevel
-  mirror([1,0,0]) Hook();
+// straight-on version, everything prefixed with s or S
+
+shookcy = -(stemlen-hookoutrad);
+sstemleny = -shookcy;
+sbend_raw = tangents_intersect_beta([0,0],tuberad,
+				    [0,shookcy],hookinrad);
+sbend = angle_map_range(360-sbend_raw, -180);
+
+module SPlan(){
+  ClipPlan(sbend, sstemleny);
+  FArcSegment(0,shookcy, hookinrad,hookoutrad,
+	      270 - hookcurl,
+	      hookcurl + 90 - sbend);
+}
+
+module SElevation(){
+  boty = shookcy - hookoutrad - 1;
+  polygon([[-1,         tubeheight],
+	   [topwidth,   tubeheight],
+	   [topwidth,   elmid[1]],
+	   [hookwidth,  shookcy],
+	   [hookwidth,  boty],
+	   [-1,         boty]]);
+}
+
+module SElevationPlaced(){
+  rotate([0,-90,0]) translate([0,0,-100]) linear_extrude(height=200)
+    SElevation();
+}
+
+module SHookL(){ ///toplevel
+  intersection(){
+    linear_extrude(height=topwidth) SPlan();
+    SElevationPlaced();
+  }
+}
+
+// straight-on version, reversed, everything prefixed with t or T
+
+tjoinrad = mainoutrad * 0.7;
+tstem0leny = tuberad - tjoinrad*0.5;
+tjoinoutrad = tjoinrad + mainthick;
+
+thookcy = shookcy;
+
+tjoin0c = [tuberad - tjoinrad, -tstem0leny];
+tjoin1c = [0,                      thookcy];
+
+tbend_raw = tangents_intersect_beta(tjoin0c, tjoinrad,
+				    tjoin1c, -hookoutrad);
+tbend0 = angle_map_range(tbend_raw,       0);
+tbend1 = angle_map_range(tbend_raw + 180, -180);
+
+tbend0p = circle_point(tjoin0c, tjoinrad, tbend_raw);
+tbend1p = circle_point(tjoin1c, -hookoutrad, tbend_raw);
+
+module TPlan(){
+  ClipPlan(0, tstem0leny);
+  FArcSegment(tjoin0c[0],tjoin0c[1], tjoinrad,tjoinoutrad,
+	      tbend0, 360-tbend0);
+  FArcSegment(0,shookcy, hookinrad,hookoutrad,
+	      tbend1, 270+hookcurl - tbend1);
+  translate(tbend0p) {
+    rotate(tbend_raw+180) mirror([1,0]) {
+      translate([0,-0.1]) square(size=[mainthick, dist2d(tbend0p,tbend1p)+0.2]);
+    }
+  }
+}
+
+module THookR(){ ///toplevel
+  intersection(){
+    linear_extrude(height=topwidth) TPlan();
+    SElevationPlaced();
+  }
+}
+
+// other toplevels etc.
+
+module HookR(){ ////toplevel
+  mirror([1,0,0]) HookL();
+}
+
+module SHookR(){ ////toplevel
+  mirror([1,0,0]) SHookL();
 }
 
-module Bothly() {
-  Acrossly() child(0);
-  translate([70,0,0]) Frontbackly() child(0);
+module THookL(){ ////toplevel
+  mirror([1,0,0]) THookR();
 }
 
-Howly(0,70) {
-  Plan();
-  //ElevationCore();
-  //RightHook();
+module Demo(){ ////toplevel
+  translate([-30,tubeheight,0]) HookL();
+  translate([  0,tubeheight,0]) HookR();
+  translate([ 30,         0,0]) SHookL();
+  translate([ 60,         0,0]) SHookR();
+  translate([ 90,         0,0]) THookL();
+  translate([120,         0,0]) THookR();
 }