add deprecated msg

src/pixel/px_ascii.scad

@@ -11,7 +11,10 @@
 use <px_from.scad>;
 
 function px_ascii(char, center = false, invert = false) = 
-    let(code = ord(char))
+    let(
+        _ = echo("<b><i>pixel/px_ascii</i> is deprecated: use <i>voxel/vx_ascii</i> instead.</b>"),
+        code = ord(char)
+    )
     assert(code > 31 && code < 127, "not printable character")
     let(
         idx = code - 32,

src/pixel/px_circle.scad

@@ -13,5 +13,8 @@ use <../util/sort.scad>;
 use <../util/dedup.scad>;
 
 function px_circle(radius, filled = false) = 
-    let(all = _px_circle_impl(radius, filled))
+    let(
+        _ = echo("<b><i>pixel/px_circle</i> is deprecated: use <i>voxel/vx_circle</i> instead.</b>"),
+        all = _px_circle_impl(radius, filled)
+    )
     dedup(sort(all, by = "vt"), sorted = true);

src/pixel/px_cylinder.scad

@@ -13,5 +13,8 @@ use <../util/sort.scad>;
 use <../util/dedup.scad>;
 
 function px_cylinder(r, h, filled = false, thickness = 1) =
-    let(all = _px_cylinder_impl(r, h, filled, thickness))
+    let(
+        _ = echo("<b><i>pixel/px_cylinder</i> is deprecated: use <i>voxel/vx_cylinder</i> instead.</b>"),
+        all = _px_cylinder_impl(r, h, filled, thickness)
+    )
     dedup(sort(all, by = "vt"), sorted = true);

src/pixel/px_from.scad

@@ -10,4 +10,8 @@
 
 use <_impl/_px_from_impl.scad>;
 
-function px_from(binaries, center = false, invert = false) = _px_from_impl(binaries, center, invert);
+function px_from(binaries, center = false, invert = false) = 
+    let(
+        _ = echo("<b><i>pixel/px_from</i> is deprecated: use <i>voxel/vx_from</i> instead.</b>")
+    )
+    _px_from_impl(binaries, center, invert);

src/pixel/px_gray.scad

@@ -11,4 +11,7 @@
 use <_impl/_px_gray_impl.scad>;
 
 function px_gray(levels, center = false, invert = false, normalize = false) = 
+    let(
+        _ = echo("<b><i>pixel/px_gray</i> is deprecated: use <i>voxel/vx_gray</i> instead.</b>")
+    )
     _px_gray_impl(levels, center, invert, normalize);

src/pixel/px_line.scad

@@ -10,4 +10,8 @@
 
 use <_impl/_px_line_impl.scad>;
 
-function px_line(p1, p2) = _px_line_impl(p1, p2);
+function px_line(p1, p2) = 
+    let(
+        _ = echo("<b><i>pixel/px_line</i> is deprecated: use <i>voxel/vx_line</i> instead.</b>")
+    )
+    _px_line_impl(p1, p2);

src/pixel/px_polygon.scad

@@ -4,7 +4,10 @@ use <../util/dedup.scad>;
 use <px_polyline.scad>;
 
 function px_polygon(points, filled = false) =
-    let(contour = px_polyline(concat(points, [points[0]])))
+    let(
+        _ = echo("<b><i>pixel/px_polygon</i> is deprecated: use <i>voxel/vx_polygon</i> instead.</b>"),
+        contour = px_polyline(concat(points, [points[0]]))
+    )
     !filled ? contour :
     let(
         sortedXY = sort(contour, by = "vt"),

src/pixel/px_polyline.scad

@@ -17,6 +17,7 @@ use <px_line.scad>;
 
 function px_polyline(points) =
     let(
+        _ = echo("<b><i>pixel/px_polyline</i> is deprecated: use <i>voxel/vx_polyline</i> instead.</b>"),
         is_2d = len(points[0]) == 2,
         pts = is_2d ? [for(pt = points) __to3d(pt)] : points,
         polyline = [for(line =  __lines_from(pts)) each px_line(line[0], line[1])]

src/pixel/px_sphere.scad

@@ -9,7 +9,10 @@
 **/ 
 
 function px_sphere(radius, filled = false, thickness = 1) = 
-    let(range = [-radius: radius - 1])
+    let(
+        _ = echo("<b><i>pixel/px_sphere</i> is deprecated: use <i>voxel/vx_sphere</i> instead.</b>"),
+        range = [-radius: radius - 1]
+    )
     filled ? [
         for(z = range)
             for(y = range)