java/examples/GettingStartedBook/Chapter07/Ex_07_14/Ex_07_14.pde

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+// Example 07-14 from "Getting Started with Processing" 
+// by Reas & Fry. O'Reilly / Make 2010
+
+float angle = 0.0;
+float offset = 60;
+float scalar = 30;
+float speed = 0.05;
+
+void setup() {
+  size(120, 120);
+  smooth();
+}
+
+void draw() {
+  float x = offset + cos(angle) * scalar;
+  float y = offset + sin(angle) * scalar;
+  ellipse( x, y, 40, 40);
+  angle += speed;
+}
+