add fidget_cat

examples/spiral_polygons/fidget_cat.scad

@@ -0,0 +1,102 @@
+use <shape_ellipse.scad>;
+use <shape_cyclicpolygon.scad>;
+
+beginning_radius = 7.5;
+
+number_of_polygons = 6;
+height = 20;
+thickness = 1.25;
+spacing = thickness * 1.75;
+slope = 0.56;
+
+$fn = 48;
+
+fidget_cat(beginning_radius, number_of_polygons, height, thickness, spacing, slope);
+
+module fidget_cat(beginning_radius, n, height, thickness, spacing, slope) {
+    fn = 8;
+    theta = 180 / fn;
+
+	y = beginning_radius - beginning_radius * cos(theta);
+	dr = y / cos(theta) + thickness + spacing;
+
+	module cat(r) {
+		polygon(shape_ellipse([r, r * 0.95]));	
+		
+		rotate(45)
+		translate([r * 0.9, 0])
+		polygon(
+            shape_cyclicpolygon(
+                sides = 3, 
+                circle_r = r * 0.5, 
+                corner_r = r * 0.1
+            )
+        );
+		
+		rotate(135)
+		translate([r * 0.9, 0])
+		polygon(
+            shape_cyclicpolygon(
+                sides = 3, 
+                circle_r = r * 0.5, 
+                corner_r = r * 0.1
+            )
+        );
+	}
+	
+	module eye() {
+		difference() {
+			circle(beginning_radius * 0.2);
+			translate([beginning_radius * 0.05, 0])
+			    circle(beginning_radius * 0.075);
+		}
+	}
+	
+	rs = [for(i = [0: n + 1]) beginning_radius + i * dr];
+	
+	half_height = height / 2;
+
+	s = [for(i = [1: n + 1]) (rs[i] + slope * half_height) / rs[i]];
+
+	module half() {
+	    translate([0, 0, -half_height]) {
+		    // translate([0, 0, -7.3])
+			difference() {
+				linear_extrude(half_height, scale = s[0])
+					cat(beginning_radius);
+					
+				linear_extrude(thickness * 2, center = true) {
+					translate([beginning_radius * 0.4, beginning_radius * 0.15]) 
+						eye();
+					
+					translate([-beginning_radius * 0.4, beginning_radius * 0.15]) 
+						eye();
+						
+					translate([0, -beginning_radius * 0.2])
+					rotate(-90)
+					polygon(
+						shape_cyclicpolygon(
+							sides = 3, 
+							circle_r = beginning_radius * 0.175, 
+							corner_r = beginning_radius * 0.06
+						)
+					);
+				}
+			}
+			
+			for(i = [1:n - 1]) {
+				linear_extrude(half_height, scale = s[i])
+				difference() {
+					cat(rs[i]);
+				    cat(rs[i] - thickness);
+				}					
+			}
+		}
+	}
+	
+	half();	
+	mirror([0, 0, 1])
+		half();
+		
+    
+}