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); } }