replace color scheme handling with a "default" color

attachments.scad

@@ -16,28 +16,8 @@
 // Default values for attachment code.
 $tags = "";
 $overlap = 0;
-$color = undef;//"yellow";
+$color = "default";          
 $save_color = undef;         // Saved color to revert back for children
-$color_scheme = "cornfield"; // Default color scheme
-
-_default_colors = [
-   ["cornfield", "#f9d72c"],
-   ["metallic", "#ddddff"],
-   ["sunset", "#ffaaaa"],
-   ["starnight", "#ffffe0"],
-   ["beforedawn", "#cccccc"],
-   ["nature", "#16a085"],
-   ["deepocean", "#eeeeee"],
-   ["solarized", "#b58800"],
-   ["tomorrow", "#4271ae"],
-   ["tomorrow night", "#81a2be"],
-   ["monotone", "#f9d72c"]
-];
-
-function _default_color() =
-   let(ind = search([downcase($color_scheme)], _default_colors, 1, 0))
-   assert(ind[0]!=[], str("$color_scheme set to unknown value ",$color_scheme))
-   _default_colors[ind[0]][1];
 
 $attach_to = undef;
 $attach_anchor = [CENTER, CENTER, UP, 0];
@@ -837,10 +817,10 @@ module hulling(a)
 // Description:
 //   Sets the color for children that can use the $color special variable.  For this to work
 //   you cannot have any color() modules above it in any parents, only other recolor() or color_this() modules.
-//   Not ethat recolor() affects its children and all their descendants.  
+//   Note that recolor() affects its children and all their descendants.  
 //   For a more step-by-step explanation of attachments, see the [[Attachments Tutorial|Tutorial-Attachments]].
 // Arguments:
-//   c = Color name or RGBA vector.  Default: The standard OpenSCAD yellow
+//   c = Color name or RGBA vector.  Default: The default color in your color scheme. 
 // Example:
 //   cuboid([10,10,5])
 //     recolor("green")attach(TOP,BOT) cuboid([9,9,4.5])
@@ -849,9 +829,9 @@ module hulling(a)
 //           attach(TOP,BOT) cuboid([6,6,3])
 //             recolor("cyan")attach(TOP,BOT) cuboid([5,5,2.5])
 //               attach(TOP,BOT) cuboid([4,4,2]);
-module recolor(c)
+module recolor(c="default")
 {
-    $color = default(c,_default_color());
+    $color=c;
     children();
 }
 
@@ -865,18 +845,11 @@ module recolor(c)
 //   Sets the color for children at one level, reverting to the previous color for further descendants.
 //   This works only with attachables and you cannot have any color() modules above it in any parents,
 //   only recolor() or other color_this() modules.
-//   .
-//   This module works by saving the current color, which means it needs to know the current color.  If you have
-//   not yet set the color with {{recolor()}} then the current color is the default color.  
-//   OpenSCAD provides no method for learning the value of the default color, so if you don't use the default
-//   "cornfield" color scheme you should set $color_scheme to the color scheme you are using.
-//   Alternatively, always use {{recolor()}} on a parent before using color_this().  
 //   . 
 //   For a more step-by-step explanation of attachments, see the [[Attachments Tutorial|Tutorial-Attachments]].
 // Arguments:
 //   c = Color name or RGBA vector.  Default: the standard OpenSCAD yellow
 // Example:
-//   $color_scheme = "cornfield";   // Change this if necessary
 //   cuboid([10,10,5])
 //     color_this("green")attach(TOP,BOT) cuboid([9,9,4.5])
 //       attach(TOP,BOT) cuboid([8,8,4])
@@ -884,10 +857,10 @@ module recolor(c)
 //           attach(TOP,BOT) cuboid([6,6,3])
 //             color_this("cyan")attach(TOP,BOT) cuboid([5,5,2.5])
 //               attach(TOP,BOT) cuboid([4,4,2]);
-module color_this(c)
+module color_this(c="default")
 {
-  $save_color=default($color, _default_color());
+  $save_color=default($color,"default");
-  $color=default(c, _default_color());
+  $color=c;
   children();
 }
 
@@ -1441,7 +1414,7 @@ module attachable(
         $attach_to   = undef;
         do_show = _attachment_is_shown($tags);
         if (do_show) {
-            if (is_undef($color)) {
+            if (is_undef($color) || $color=="default") {
                 children(0);
             } else color($color) {
                 $color = undef;
@@ -2369,7 +2342,6 @@ module anchor_arrow2d(s=15, color=[0.333,0.333,1], $tags="anchor-arrow") {
 
 
 
-
 // Module: expose_anchors()
 // Usage:
 //   expose_anchors(opacity) {child1() show_anchors(); child2() show_anchors(); ...}
@@ -2382,17 +2354,17 @@ module anchor_arrow2d(s=15, color=[0.333,0.333,1], $tags="anchor-arrow") {
 //   expose_anchors() cube(50, center=true) show_anchors();
 module expose_anchors(opacity=0.2) {
     show("anchor-arrow")
-       children();
+        children();
     hide("anchor-arrow")
-        color(is_undef($color)? [0,0,0] :
+        color(is_undef($color) || color=="default" ? [0,0,0] :
-              is_string($color)? $color :
+              is_string($color) ? $color 
-                                 point3d($color), opacity)
+                                : point3d($color),
+              opacity)
             children();
 }
 
 
 
-
 // Module: frame_ref()
 // Usage:
 //   frame_ref(s, opacity);