1 /* 2 * File: OctagonTest.java 3 * 4 * Rotate a regular octagon 5 * 6 * Copyright: Northeast Parallel Architectures Center 7 * 8 */ 9 10 import java.applet.Applet; 11 import java.awt.Graphics; 12 13 public class OctagonTest extends Applet { 14 15 // create a reference to an octagon: 16 private Octagon octagon; 17 18 // center of regular octagon: 19 private int x, y; 20 21 // radius of regular octagon: 22 private int r; 23 24 // number of rotations: 25 private int n = 7; 26 27 // rotation angle: 28 private double theta = 2 * Math.PI / n; 29 30 public void init() { 31 x = y = Math.min( getSize().width, getSize().height )/2; 32 r = x - 15; 33 } 34 35 public void paint( Graphics g ) { 36 37 // instantiate a regular octagon: 38 octagon = new Octagon( x, y, r ); 39 40 // rotate and draw: 41 for ( int i = 0; i < n; i++ ) { 42 octagon.centerRotate( theta ).draw( g ); 43 } 44 45 } 46 47 }