Two new examples Star and Regular Polygon for Basics

java/examples/Basics/Form/PieChart/PieChart.pde

@@ -1,28 +1,28 @@
 /**
  * Pie Chart  
- * By Ira Greenberg 
  * 
  * Uses the arc() function to generate a pie chart from the data
  * stored in an array. 
  */
 
-
-float diameter;
 int[] angles = { 30, 10, 45, 35, 60, 38, 75, 67 };
-float lastAngle = 0;
 
 void setup() {
   size(640, 360);
-  background(100);
   noStroke();
-  diameter = min(width, height) * 0.75;
   noLoop();  // Run once and stop
 }
 
-
 void draw() {
-  for (int i = 0; i < angles.length; i++) {
-    fill(angles[i] * 3.0);
+  background(100);
+  pieChart(300, angles);
+}
+
+void pieChart(float diameter, int[] data) {
+  float lastAngle = 0;
+  for (int i = 0; i < data.length; i++) {
+    float gray = map(i, 0, data.length, 0, 255);
+    fill(gray);
     arc(width/2, height/2, diameter, diameter, lastAngle, lastAngle+radians(angles[i]));
     lastAngle += radians(angles[i]);
   }