Example Depot

// Class to hold a value for a slice public class PieValue { double value; Color color; public PieValue(double value, Color color) { this.value = value; this.color = color; } } // slices is an array of values that represent the size of each slice. public void drawPie(Graphics2D g, Rectangle area, PieValue[] slices) { // Get total value of all slices double total = 0.0D; for (int i=0; i<slices.length; i++) { total += slices[i].value; } // Draw each pie slice double curValue = 0.0D; int startAngle = 0; for (int i=0; i<slices.length; i++) { // Compute the start and stop angles startAngle = (int)(curValue * 360 / total); int arcAngle = (int)(slices[i].value * 360 / total); // Ensure that rounding errors do not leave a gap between the first and last slice if (i == slices.length-1) { arcAngle = 360 - startAngle; } // Set the color and draw a filled arc g.setColor(slices[i].color); g.fillArc(area.x, area.y, area.width, area.height, startAngle, arcAngle); curValue += slices[i].value; } }

class MyComponent extends JComponent { PieValue[] slices = new PieValue[4]; MyComponent() { slices[0] = new PieValue(25, Color.red); slices[1] = new PieValue(33, Color.green); slices[2] = new PieValue(20, Color.pink); slices[3] = new PieValue(15, Color.blue); } // This method is called whenever the contents needs to be painted public void paint(Graphics g) { // Draw the pie drawPie((Graphics2D)g, getBounds(), slices); } }

// Show the component in a frame JFrame frame = new JFrame(); frame.getContentPane().add(new MyComponent()); frame.setSize(300, 200); frame.setVisible(true);