Hypnotic squares

2025-08-01 12:30:33 +02:00 · 2019-08-11 10:45:32 +08:00
parent ade18af430
commit 4916d30c08
1 changed files with 82 additions and 0 deletions
--- a/examples/hypnotic_squares.scad
+++ b/examples/hypnotic_squares.scad
@@ -0,0 +1,82 @@
+include <hollow_out.scad>;
+include <bend_extrude.scad>;
+include <box_extrude.scad>;
+
+x_grids = 12;
+y_grids = 5;
+grid_size = 15;
+final_size = 3;
+line_width = 1;
+fn = 12;
+
+module hypnotic_squares(x_grids, y_grids, grid_size, final_size, line_width) {
+    function random() = rands(0, 1, 1)[0];
+
+    dirs = [-1, 0, 1];
+    max_steps = ceil((grid_size - final_size) / (line_width * 2));
+    start_steps = 2 + round(random() * (max_steps - 2));
+    half_lw = line_width / 2;
+    
+    module hollow_square(x, y, size) {
+        translate([x - half_lw, y - half_lw])  
+            hollow_out(line_width) 
+                square(size + line_width);
+    }
+
+    module draw(x, y, size, xMovement, yMovement, steps) {
+        hollow_square(x, y, size);
+     
+        if(steps >= 0) {
+            new_size = (grid_size) * (steps / start_steps) + final_size;
+
+            new_x = x + (size - new_size) / 2;
+            new_y = y + (size - new_size) / 2;
+            draw(
+                new_x - ((x - new_x) / (steps + 3)) * xMovement, 
+                new_y - ((y - new_y) / (steps + 3)) * yMovement, 
+                new_size, 
+                xMovement, 
+                yMovement, 
+                steps - 1)
+            ;
+        }
+    }
+
+    rand_lt = [for(x = 0; x < x_grids; x = x + 1) 
+                  [for(y = 0; y < y_grids; y = y + 1) 
+                      [random(), random()]
+                  ]
+              ];
+              
+    module grids() {
+        translate([0, half_lw]) 
+            for(x = [0:x_grids - 1]) {
+                for(y = [0:y_grids - 1]) {
+                    draw(
+                        x * grid_size, 
+                        y * grid_size, 
+                        grid_size, 
+                        dirs[floor(rand_lt[x][y][0] * 3)], 
+                        dirs[floor(rand_lt[x][y][1] * 3)],
+                        start_steps - 1
+                    );
+                }
+            }    
+    }
+
+    bend_extrude(
+        size = [grid_size * x_grids, grid_size * y_grids + line_width], 
+        thickness = line_width, 
+        angle = 360, 
+        frags = $fn
+    ) grids();
+}
+
+
+hypnotic_squares(x_grids, y_grids, grid_size, final_size, line_width, $fn = fn);
+
+r = (0.5 * grid_size * x_grids / fn) / sin(180 / fn);
+box_extrude(
+    height = grid_size * y_grids + line_width, 
+    shell_thickness  = line_width
+) circle(r - line_width / 2, $fn = fn);