+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 THookL(){ ////toplevel
+ mirror([1,0,0]) THookR();
+}
+
+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();
+}