add torus_maze

examples/maze/torus_maze.scad

@@ -0,0 +1,33 @@
+use <hull_polyline3d.scad>;
+use <rotate_p.scad>;
+use <square_maze.scad>;
+use <experimental/tf_torus.scad>;
+
+rows = 36;
+columns = 12;
+block_width = 2;
+wall_thickness = 1;   
+angle = 180;
+twist = 360;
+
+leng = rows * block_width;
+radius = 0.5 * leng / PI;
+a_step = 360 / leng;
+
+blocks = go_maze( 
+    1, 1,   // starting point
+    starting_maze(rows, columns),  
+    rows, columns, x_circular = true, y_circular = true
+);
+walls = maze_walls(blocks, rows, columns, block_width, left_border = false, bottom_border = false);
+
+size = [columns * block_width, rows * block_width];
+for(wall_pts = walls) {  
+   transformed = [for(pt = wall_pts) tf_torus(size, pt, [radius, radius / 2], twist = twist)];
+   hull_polyline3d(transformed, wall_thickness, $fn = 4);
+}
+
+color("black")
+rotate_extrude($fn = 36)
+translate([radius * 1.5, 0, 0])
+    circle(radius / 2);