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+====== Sacks spiral in Processing ======
+<code java>
+int i=0;
+int centerx,centery;
+void setup()
+{
+  size(500,500);
+  frameRate(1000);
+  centerx = width/2;
+  centery = height/2;
+  ellipseMode(CENTER);
+  rectMode(CENTER);
+  background(255);
+}
+boolean isprime(int n)
+{
+    if (n%2==0) return false;
+    for(int i=3; i*i <= n; i+=2)
+        if(n%i==0) return false;
+    return true;
+}
+void draw()
+{
+  if (isprime(i++))
+  {
+    fill(0);
+    float r = sqrt(i-1);
+    float X = centerx + (r*cos(radians(360*r)))*1;
+    float Y = centery + (r*sin(radians(360*r)))*1;
+    //ellipse(X,Y,4,4);
+    rect(X,Y,1,1);
+  }
+}
+</code>
+{{:projects:sacks_spiral.png?nolink |}}