From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 20 Jan 2018 21:03:14 +0000 (+0000)
Subject: fairphone-case: wip ButtonPlan, needs new approach
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=commitdiff_plain;h=e74ae676c2f556d01000c7c05f1bbc4bfec2838c

fairphone-case: wip ButtonPlan, needs new approach

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/fairphone-case.scad b/fairphone-case.scad
index 401f9fc..14db4f8 100644
--- a/fairphone-case.scad
+++ b/fairphone-case.scad
@@ -44,9 +44,9 @@ lid_lip = 1.75;
 $fa = 5;
 $fs = 0.1;
 
-// calculated
+// ---------- calculated ----------
 
-// could be changed
+// ----- could be changed -----
 lid_buttoncover_gap = lid_gap_x;
 lid_buttoncover_overlap = case_th_lip + keeper_gap_z_top;
 
@@ -75,6 +75,7 @@ lpp11 = [ lpp10[0],            epp5[1] + lid_gap_z ];
 lpp12 = [ epp4[0] + lid_lip,   lpp11[1] ];
 lpp13 = [ lpp12[0],            lpp12[1] + lid_lip ];
 
+// button profile
 bppM = epp4 + [0,5];
 bppN = [ 0.5 * (epp0[0] + epp4[0]), bppM[1] ];
 bppR = [ bppN[0] + lid_buttoncover_gap, -button_cutout_depth ];
@@ -137,7 +138,38 @@ module ButtonCoverProfile(){
   }
 }
 
-module ButtonPlan(){
+module ButtonPlan(l, bigger){
+  C = [0,0]; // by definition
+  T = [ 0, epp4[1] ];
+  G = T + [0,10];
+  B0 = T + [0,-1] * button_cutout_depth;
+  r0 = 0.5 * (T[1] - B0[1]);
+  A = [  -l/2 + r0, 0.5 * (T[1] + B0[1]) ];
+  r1 = r0 + bigger;
+  // | D1 - A | = r1 * 2
+  // D1_y = T_y - r1
+  // =>    4 * r1^2   =  (r1-r0)^2 + (D1_x - A_x)^2
+  // =>    D1_x =  A_x + v/~ [  4 * r1^2   -   (r1-r0)^2 ]
+  D1  = [ A[0] + sqrt( 4*r1*r1 - bigger*bigger ),  T[1] - r1 ];
+  E1  = 0.5 * (D1 + A);
+  F1  = D1 + [0,10];
+
+  hull(){
+    for (m=[0,1]) mirror([m,0])
+      circleat(A, r1);
+  }
+  for (m=[0,1]) mirror([m,0]) {
+    difference(){
+      polygon([ E1,
+		A,
+		B0,
+		G,
+		F1,
+		D1
+		]);
+      circleat(D1, r1);
+    }
+  }
 }
 
 module CaseBase_rhsflip(yn=[0,1]) {
@@ -314,6 +346,14 @@ module Keeper(){ ////toplevel
     OneKeeper();
 }
 
+module ButtonPlanForDemo(colour, z, gap, overlap){
+  color(colour)
+    translate([0,0,z])
+    ButtonPlan(8,
+	       lid_buttoncover_gap * gap +
+	       lid_buttoncover_overlap * overlap);
+}
+
 module DemoProfiles(){ ////toplevel
   LidEdgeProfile();
   %EdgeProfile();
@@ -331,6 +371,13 @@ module DemoProfiles(){ ////toplevel
       rectfromto(bppR, demopoint_QR);
     }
   }
+
+  translate([-40,0]) {
+    ButtonPlanForDemo("blue",    0, 0,0);
+    ButtonPlanForDemo("red",    -1, 1,0);
+    ButtonPlanForDemo("yellow", -2, 0,1);
+    ButtonPlanForDemo("blue",   -3, 1,1);
+  }
 }
 
 //EdgeProfile();