java/examples/Basics/Structure/Recursion2/Recursion2.pde

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+/**
+ * Recursion. 
+ * 
+ * A demonstration of recursion, which means functions call themselves. 
+ * Notice how the drawCircle() function calls itself at the end of its block. 
+ * It continues to do this until the variable "level" is equal to 1. 
+ */
+ 
+void setup() 
+{
+  size(200, 200);
+  noStroke();
+  smooth();
+  drawCircle(100, 100, 80, 8);
+}
+
+void drawCircle(float x, float y, int radius, int level) 
+{                    
+  float tt = 126 * level/6.0;
+  fill(tt, 153);
+  ellipse(x, y, radius*2, radius*2);      
+  if(level > 1) {
+    level = level - 1;
+    int num = int(random(2, 6));
+    for(int i=0; i<num; i++) {
+      float a = random(0, TWO_PI);
+      float nx = x + cos(a) * 6.0 * level;
+      float ny = y + sin(a) * 6.0 * level;
+      drawCircle(nx, ny, radius/2, level);
+    }
+  }
+}