From 519a41c7a4232db4223cbc08a067771bf699a448 Mon Sep 17 00:00:00 2001
From: djerun <djerun@hamburg.ccc.de>
Date: Sun, 15 Jun 2025 16:30:38 +0200
Subject: [PATCH] [WIP][DEBUG]

---
 bezier_circle_approximation.scad | 15 ++++++++++
 headband.scad                    |  2 +-
 pressfit_bunnyears.scad          | 50 ++++++++++++++++++--------------
 pressfit_catears.scad            | 28 ++++++++++++++++--
 4 files changed, 71 insertions(+), 24 deletions(-)
 create mode 100644 bezier_circle_approximation.scad

diff --git a/bezier_circle_approximation.scad b/bezier_circle_approximation.scad
new file mode 100644
index 0000000..fd404d2
--- /dev/null
+++ b/bezier_circle_approximation.scad
@@ -0,0 +1,15 @@
+a=90;
+
+module bezier_curve(p0, p1, p2, p3) {
+  // TODO
+}
+
+module /*TODO*/ {
+  c = /*TODO*/;
+  bezier_curve(
+    [0, 1],
+    [c, 1],
+    [1, c],
+    [1, 0]
+  );
+}
diff --git a/headband.scad b/headband.scad
index 53465e7..768ea3a 100644
--- a/headband.scad
+++ b/headband.scad
@@ -4,7 +4,7 @@ use <chamfer.scad>
 
 module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, rake_depth=RAKE_DEPTH, rake_width=RAKE_WIDTH, rake_stretch=RAKE_STRETCH, rake_chamfer=RAKE_CHAMFER, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, with_rake=true, details=true) {
   union() {
-    chamfer(size=(details)?chamfer:0, child_h=height, child_bot=-height/2, shape=chamfer_shape) union() {
+    /*chamfer(size=(details)?chamfer:0, child_h=height, child_bot=-height/2, shape=chamfer_shape)*/ union() {
       color("purple")
         partial_ring(part, radius=size, thickness=thickness, height=height);
       rotate( 90-180*part, [0, 0, 1])
diff --git a/pressfit_bunnyears.scad b/pressfit_bunnyears.scad
index 7a34637..9c64e2b 100644
--- a/pressfit_bunnyears.scad
+++ b/pressfit_bunnyears.scad
@@ -8,30 +8,38 @@ $fn=90;
 EAR_SCALE = 0.5;
 EAR_BEND_FACTOR = 0.2;
 EAR_STRETCH_FACTOR = 8;
-STEP_SIZE = .5;
+STEP_SIZE = .25;
+
+
+module loop(i) {
+  j=pow(0.99, i);
+  //chamfer_ = floor(abs(2*i/(SIZE/2*EAR_SCALE-1)-1));
+  translate([-j*20, 0, 0])
+    difference() {
+      rotate(90, [0, 1, 0])
+        /*chamfer(size=1, child_h=1, child_bot=-0.5, shape=CHAMFER_SHAPE)*/ {
+          //echo("i", i, "j", j, "chamfer_", chamfer_);
+          union() catear(
+            debug=DEBUG,
+            height=INSERTICLE_Z*1.2,
+            thickness=THICKNESS,
+            side_len=SIZE/2*EAR_SCALE-i,
+            bend_factor=EAR_BEND_FACTOR,
+            stretch_factor=EAR_STRETCH_FACTOR,
+            chamfer=0, //chamfer_,
+            chamfer_shape=CHAMFER_SHAPE,
+            details=false,
+            end_caps=true
+          );
+        }
+      cube([100, 100, THICKNESS], center=true);
+     }
+}
 
 //difference() {
   translate([20*pow(0.99, SIZE/2*EAR_SCALE-1-THICKNESS), 0, -THICKNESS/2])
-    /*union()*/ for (i=[0:STEP_SIZE:SIZE/2*EAR_SCALE-1]) {
-      j=pow(0.99, i);
-      chamfer_ = floor(abs(2*i/(SIZE/2*EAR_SCALE-1)-1));
-      translate([-j*20, 0, 0])
-        rotate(90, [0, 1, 0])
-          /*chamfer(size=1, child_h=1, child_bot=-0.5, shape=CHAMFER_SHAPE)*/ {
-            echo("i", i, "j", j, "chamfer_", chamfer_);
-            catear(
-              debug=DEBUG,
-              height=INSERTICLE_Z*1.2,
-              thickness=THICKNESS,
-              side_len=SIZE/2*EAR_SCALE-i,
-              bend_factor=EAR_BEND_FACTOR,
-              stretch_factor=EAR_STRETCH_FACTOR,
-              chamfer=0, //chamfer_,
-              chamfer_shape=CHAMFER_SHAPE,
-              details=false,
-              end_caps=false
-            );
-          }
+    union() for (i=[0:STEP_SIZE:0/*SIZE/2*EAR_SCALE-1*/]) {
+      loop(i);
     }
 //  translate([0, 0, -THICKNESS]) cube([100, 100, THICKNESS], center=true);
 //  scale([1, 1, 2]) inserticle();
diff --git a/pressfit_catears.scad b/pressfit_catears.scad
index 4fbeafe..05e2a41 100644
--- a/pressfit_catears.scad
+++ b/pressfit_catears.scad
@@ -1,5 +1,7 @@
 include <globals.scad>;
+include <primitives.scad>;
 
+use <headband.scad>;
 use <catear_headband.scad>;
 use <pressfit_headband.scad>;
 use <chamfer.scad>;
@@ -7,9 +9,9 @@ use <chamfer.scad>;
 EAR_SCALE = 1.5;
 EAR_BEND_FACTOR = 0.15;
 EAR_STRETCH_FACTOR = 1.2;
-STEP_SIZE = 1;
+STEP_SIZE = 100;
 
-difference() {
+translate([50, 0, 0]) difference() {
   translate([20*pow(0.99, SIZE/2*EAR_SCALE-1-THICKNESS), 0, -THICKNESS/2])
     union() for (i=[0:STEP_SIZE:SIZE/2*EAR_SCALE-1]) {
       j=pow(0.99, i);
@@ -32,3 +34,25 @@ difference() {
   translate([0, 0, -THICKNESS]) cube([100, 100, THICKNESS], center=true);
   scale([1, 1, 2]) inserticle();
 }
+
+side_len=SIZE/2*EAR_SCALE;
+r=side_len/2;
+E=1.6*EAR_STRETCH_FACTOR;
+e=E*(r+THICKNESS/4)/(r-THICKNESS/4);
+T=side_len+THICKNESS;
+S=side_len-THICKNESS;
+xremap = function (x) pow(x, EAR_STRETCH_FACTOR);
+yremap = function (y) pow(y, 1);
+//f = function (p) [j((p.x+T/2)/T)*T-T/2, pow(p.y, 2)/r*E, p.z];
+//g = function (p) [j((p.x+S/2)/S)*S-S/2, pow(p.y, 2)/r*E*(T+THICKNESS)/S, p.z];
+f = function (p) [scalc(xremap, p.x, -T/2, T/2), scalc(yremap, p.y, 0, T/2)*E, p.z];
+g = function (p) [scalc(xremap, p.x, -S/2, S/2), scalc(yremap, p.y, 0, S/2)*e, p.z];
+
+rotate([0, 90, 0]) color("yellow") arc(0.5, r, THICKNESS, HEIGHT, outer_remap=f, inner_remap=g);
+
+color("red") catear_v2(HEIGHT, THICKNESS, side_len=SIZE/2*EAR_SCALE, stretch_factor=EAR_STRETCH_FACTOR);
+
+//     a =     b + c
+// x * a = y * b + c
+// y / x = a /(b + c)
+// y = x * a /(b + c)