dot notation indexing

examples/dragon/dragon_and_pearl.scad

@@ -41,9 +41,9 @@ module tail() {
 module dragon_and_perl() {
     function __angy_angz(p1, p2) = 
         let(
-            dx = p2[0] - p1[0],
-            dy = p2[1] - p1[1],
-            dz = p2[2] - p1[2],
+            dx = p2.x - p1.x,
+            dy = p2.y - p1.y,
+            dz = p2.z - p1.z,
             ya = atan2(dz, sqrt(pow(dx, 2) + pow(dy, 2))),
             za = atan2(dy, dx)
         ) [ya, za];

examples/dragon/infinity_dragon.scad

@@ -41,9 +41,9 @@ module tail() {
 module infinity_dragon() {
     function __angy_angz(p1, p2) = 
         let(
-            dx = p2[0] - p1[0],
-            dy = p2[1] - p1[1],
-            dz = p2[2] - p1[2],
+            dx = p2.x - p1.x,
+            dy = p2.y - p1.y,
+            dz = p2.z - p1.z,
             ya = atan2(dz, sqrt(pow(dx, 2) + pow(dy, 2))),
             za = atan2(dy, dx)
         ) [ya, za];

examples/dragon/torus_knot_dragon.scad

@@ -25,9 +25,9 @@ module torus_knot_dragon() {
 
     function __angy_angz(p1, p2) = 
         let(
-            dx = p2[0] - p1[0],
-            dy = p2[1] - p1[1],
-            dz = p2[2] - p1[2],
+            dx = p2.x - p1.x,
+            dy = p2.y - p1.y,
+            dz = p2.z - p1.z,
             ya = atan2(dz, sqrt(dx * dx + dy * dy)),
             za = atan2(dy, dx)
         ) [ya, za];

src/__comm__/__angy_angz.scad

@@ -1,8 +1,8 @@
 function __angy_angz(p1, p2) = 
     let(
-        dx = p2[0] - p1[0],
-        dy = p2[1] - p1[1],
-        dz = p2[2] - p1[2],
+        dx = p2.x - p1.x,
+        dy = p2.y - p1.y,
+        dz = p2.z - p1.z,
         ya = atan2(dz, sqrt(dx * dx + dy * dy)),
         za = atan2(dy, dx)
     ) [ya, za];

src/__comm__/__to2d.scad

@@ -1 +1 @@
-function __to2d(p) = [p[0], p[1]];
+function __to2d(p) = [p.x, p.y];

src/__comm__/__to3d.scad

@@ -1 +1 @@
-function __to3d(p) = [p[0], p[1], 0];
+function __to3d(p) = [p.x, p.y, 0];

src/__comm__/__to_ang_vect.scad

@@ -1,6 +1,6 @@
 function __to_3_elems_ang_vect(a) =
      let(leng = len(a))
      leng == 3 ? a : 
-     leng == 2 ? [a[0], a[1], 0] : [a[0], 0, 0];
+     leng == 2 ? [a.x, a.y, 0] : [a.x, 0, 0];
 
 function __to_ang_vect(a) = is_num(a) ? [0, 0, a] : __to_3_elems_ang_vect(a);

src/__comm__/__trapezium.scad

@@ -7,7 +7,7 @@ function __trapezium(length, h, round_r) =
         l_half_trapezium = [
             for(i = 0; i <= to; i = i + 1)
                 let(pt = r_half_trapezium[to - i])
-                [-pt[0], pt[1]]
+                [-pt.x, pt.y]
         ]
     )    
     concat(

src/__comm__/_convex_hull2.scad

@@ -1,7 +1,7 @@
 use <../util/slice.scad>;
 
 function _convex_hull_lt_than_by_xy(p1, p2) =
-    p1[0] < p2[0] || (p1[0] == p2[0] && p1[1] < p2[1]);
+    p1.x < p2.x || (p1.x == p2.x && p1.y < p2.y);
 
 function _convex_hull_sort_by_xy(lt) = 
     let(leng = len(lt))
@@ -15,15 +15,7 @@ function _convex_hull_sort_by_xy(lt) =
 
 // oa->ob ct_clk : greater than 0
 function _convex_hull_impl_dir(o, a, b) =
-    let(
-        ox = o[0],
-        oy = o[1],
-        ax = a[0],
-        ay = a[1],
-        bx = b[0],
-        by = b[1]
-    )
-    (ax - ox) * (by - oy) - (ay - oy) * (bx - ox);
+    (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x);
 
 function _convex_hull_convex_hull_lower_m(chain, p, m) = 
     (m >= 2 && _convex_hull_impl_dir(chain[m - 2], chain[m - 1], p) <= 0) ? _convex_hull_convex_hull_lower_m(chain, p, m - 1) : m;

src/__comm__/_convex_hull3.scad

@@ -1,13 +1,9 @@
 function is_zero(p) = p == [0, 0, 0];
 
 function _cmp(a, b) =
-    let(
-        ax = a[0], ay = a[1], az = a[2],
-        bx = b[0], by = b[1], bz = b[2]
-    )
-    ax != bx ? ax < bx : 
-    ay != by ? ay < by :
-    az < bz;
+    a.x != b.x ? a.x < b.x : 
+    a.y != b.y ? a.y < b.y :
+    a.z < b.z;
     
 function _convex_hull_sort_by_xyz(pts) = 
     let(leng = len(pts))