Java填充多边形相关API

转载自(略作修改)：http://www.java2s.com/CN/Code/Java/2D-Graphics-GUI/Fillapolygon.htm

package RefMaterials;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Polygon;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class FillPolyPanel extends JPanel {
	private static final long serialVersionUID = 8729489490886222075L;

	public void paintComponent(Graphics g) {
		/**
		 * 1.绘制扇形~
		 */
		super.paintComponent(g);
		int centerX = 50;
		int centerY = 100;
		int radius = 40;
		int angle = 30;
		
		Color c = g.getColor();
		g.setColor(Color.green);
		
		/**
		 * centerX-radius:左上角的x坐标~
		 * centerY-radius:左上角的y坐标
		 * 2*radius：圆的宽度
		 * 2*radius：圆的高度
		 * angle：起始角度
		 * 360-2*angle：扇形的扇区度数~
		 */
		g.fillArc(centerX - radius, centerY - radius, 2 * radius, 2 * radius, angle, 360 - 2 * angle);

		/**
		 * 2.绘制多边形，这个就是我所需要的东西了~
		 */
		Polygon p = new Polygon();
		centerX = 150;
		for (int i = 0; i < 5; i++)
			p.addPoint((int) (centerX + radius * Math.cos(i * 2 * Math.PI / 5)),
					(int) (centerY + radius * Math.sin(i * 2 * Math.PI / 5)));
//		g.fillPolygon(p);
		g.drawPolygon(p);

		/**
		 * 3.绘制螺旋状的纹路~
		 */
		p = new Polygon();
		centerX = 250;
		for (int i = 0; i < 360; i++) {
			double t = i / 360.0;
			p.addPoint((int) (centerX + radius * t * Math.cos(8 * t * Math.PI)),
					(int) (centerY + radius * t * Math.sin(8 * t * Math.PI)));
		}
		g.fillPolygon(p);
		g.setColor(c);
	}

	public static void main(String[] args) {
		JFrame frame = new JFrame();
		frame.setTitle("FillPoly");
		frame.setSize(300, 200);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().add(new FillPolyPanel());

		frame.setVisible(true);
	}

}