add fidget_heart

examples/spiral_polygons/fidget_heart.scad

@@ -0,0 +1,75 @@
+beginning_radius = 7.5;
+
+number_of_polygons = 9;
+height = 20;
+thickness = 1.25;
+spacing = thickness * 1.75;
+slope = 0.575;
+
+$fn = 24;
+
+fidget_heart(beginning_radius, number_of_polygons, height, thickness, spacing, slope);
+
+module fidget_heart(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 heart(r) {
+		module _heart(r1, r2) {
+			half_r = r1 / 2;
+			
+			hull() {
+				translate([half_r * cos(30), half_r * sin(45)])
+					circle(half_r);
+				translate([0, -r1 + 18 * r2]) 
+					circle(r2);
+			}
+				
+			hull() {
+				translate([-half_r * cos(30), half_r * sin(45)])
+					circle(half_r);
+					
+				translate([0, -r1 + 18 * r2]) 
+					circle(r2);
+			}
+		}
+	
+		offset(r * 0.2)
+		    _heart(r, r * 0.01);
+	}
+	
+	
+	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])
+			linear_extrude(half_height, scale = s[0])
+			difference() {
+				heart(beginning_radius);
+				offset(-thickness)
+				    heart(beginning_radius);
+			}
+				
+			for(i = [1:n - 1]) {
+				linear_extrude(half_height, scale = s[i])
+				difference() {
+					heart(rs[i]);
+					offset(-thickness)
+					    heart(rs[i]);
+				}					
+			}
+		}
+	}
+	
+	half();	
+	mirror([0, 0, 1])
+		half();
+}