190908

2019/sketch_190908a/sketch_190908a.pyde

@@ -0,0 +1,25 @@
+def setup():
+    size(500, 500)
+    fill(200, 0, 0) # red fill
+    stroke(0, 0, 200)  # blue stroke
+    strokeWeight(15)
+    star(250, 250, 7, 200, 100) # 7 pointed star
+
+def star(x, y, np, re, ri):
+    """
+    draw a star with np tips
+    external radius re, internal radius ri
+    """ 
+    pushMatrix()
+    translate(x, y)
+    n = np * 2
+    ang = radians(360. / n)
+    beginShape()
+    for i in range(n):
+        if i % 2 == 0: r = ri
+        else: r = re
+        x = sin(ang * i) * r
+        y = cos(ang * i) * r
+        vertex(x, y)
+    endShape(CLOSE)
+    popMatrix()