add ptf_circle to preview

README.md

@@ -172,6 +172,7 @@ See [examples](examples).
     - ptf/ptf_rotate
     - ptf/ptf_x_twist
 	- ptf/ptf_y_twist
+	- ptf/ptf_circle
 	- ptf/ptf_bend
 	- ptf/ptf_ring
 	- ptf/ptf_sphere

examples/maze/noisy_circle_maze.scad

@@ -16,15 +16,15 @@ module noisy_circle_maze(start, r_blocks, block_width, wall_thickness, origin_of
     walls = mz_walls(blocks, double_r_blocks, double_r_blocks, block_width);
     
     half_width =  width / 2;
-    offset = is_undef(origin_offset) ? [-half_width, -half_width] : origin_offset;
+    rect_size = is_undef(origin_offset) ? [width, width] : [width, width] - origin_offset * 2;
 
     noisy_f = is_undef(noisy_factor) ? 1 : noisy_factor;
     
     seed = rand(0, 256);
     for(wall = walls) {
         for(i = [0:len(wall) - 2]) {
-            p0 = ptf_circle(wall[i], offset);
-            p1 = ptf_circle(wall[i + 1], offset);
+            p0 = ptf_circle(rect_size, wall[i]);
+            p1 = ptf_circle(rect_size, wall[i + 1]);
             pn00 = pnoise2(p0[0], p0[1], seed) * noisy_f;
             pn01 = pnoise2(p0[0] + seed, p0[1] + seed, seed) * noisy_f;
             pn10 = pnoise2(p1[0], p1[1], seed) * noisy_f;

src/experimental/note.md

@@ -32,6 +32,7 @@ Preview
 - `ptf/ptf_rotate`
 - `ptf/ptf_x_twist`
 - `ptf/ptf_y_twist`
+- `ptf/ptf_circle`
 - `ptf/ptf_bend`
 - `ptf/ptf_ring`
 - `ptf/ptf_sphere`

src/ptf/ptf_circle.scad

@@ -1,6 +1,7 @@
-function ptf_circle(point, offset) =
+function ptf_circle(size, point) =
     let(
-        p = [point[0] + offset[1], point[1] + offset[0]],
+        p_offset = -size / 2,
+        p = [point[0] + p_offset[1], point[1] + p_offset[0]],
         n = max(abs(p[0]), abs(p[1])),
         r = n * 1.414,
         a = atan2(p[0], p[1])