import java.lang.*; import java.awt.*; import java.applet.*; /* * Purpose: The main program of the applet */ public class SelectionSort extends Applet { public void init() { setLayout(new BorderLayout()); STextPanel WritingArea = new STextPanel(); SSortPanel DrawingArea = new SSortPanel(); SMainPanel MainArea = new SMainPanel(DrawingArea, WritingArea); add("Center", MainArea); add("North", new SControlPanel(MainArea, this)); } } /* * Purpose: The container panel for the whole applet */ class SMainPanel extends Panel { public SSortPanel panel1; public STextPanel panel2; public SMainPanel(SSortPanel p, STextPanel t) { panel1 = p; panel2 = t; setLayout(new GridLayout(2, 1)); /* 2 rows, 1 column */ add(p); add(t); } } /* * Purpose: Drawing the text description */ class STextPanel extends Panel { private int TOPMARGIN=50; private int LEFTMARGIN=30; public boolean AnimationNext[] = new boolean[15]; public int NextStep=0; private Font f; private String Description[][] = new String[15][6]; public STextPanel() { setBackground(new Color(255, 248, 220)); /* set background as cornsilk */ f = new Font("Helvetica", Font.PLAIN, 16); Description[0][0] = "Search through the array, find the largest value,"; Description[0][1] = "(10) and exchange it with the value stored in the"; Description[0][2] = "last array location (5)."; Description[0][3] = ""; Description[0][4] = ""; Description[0][5] = ""; AnimationNext[0] = true; Description[1][0] = "Find the second-largest value in the array (9), and"; Description[1][1] = "exchange it with the value stored in the second last"; Description[1][2] = "array location (1). This is identical to the previous"; Description[1][3] = "step, except that we don't search the last value --"; Description[1][4] = "we already know it is the largest."; Description[1][5] = ""; AnimationNext[1] = true; Description[2][0] = "The last two blue elements will not be changed"; Description[2][1] = "further because they are already the largest and"; Description[2][2] = "the second largest elements in the array."; Description[2][3] = ""; Description[2][4] = ""; Description[2][5] = ""; AnimationNext[2] = false; Description[3][0] = "Now, repeat the 'select and exchange' process,"; Description[3][1] = "but each time we don't need to search the blue "; Description[3][2] = "elements and we exchange the largest value in "; Description[3][3] = "the black elements with last black element. After"; Description[3][4] = "each exchange, the last black element become "; Description[3][5] = "blue."; AnimationNext[3] = true; Description[4][0] = "The blue part of the array is alreadly sorted and"; Description[4][1] = "will not be changed further."; Description[4][2] = ""; Description[4][3] = ""; Description[4][4] = ""; Description[4][5] = ""; AnimationNext[4] = true; Description[5][0] = "The whole array is sorted now."; Description[5][1] = ""; Description[5][2] = ""; Description[5][3] = ""; Description[5][4] = ""; Description[5][5] = ""; AnimationNext[5] = true; } /* * Purpose: build in function */ public void paint(Graphics g) { g.drawRect(0, 0, size().width-1, size().height-1); g.setFont(f); for (int i=0; i<6; i++) { g.drawString(Description[NextStep][i], LEFTMARGIN, TOPMARGIN+18*i); } } /* * Purpose: executed when the next button is pushed */ public void Next() { NextStep++; repaint(); } /* * Purpose: reset this panel to the begining situation */ public void reset() { NextStep=0; repaint(); } } /* * Purpose: the control panel */ class SControlPanel extends Panel { SMainPanel MainArea; Button b1, b2, b3, bsound; Checkbox cb_sound; Applet applet; boolean voice=false; AudioClip ac=null; String sound[] = new String[6]; public SControlPanel(SMainPanel m, Applet app) { MainArea = m; applet = app; sound[0] = "sound/select1.au"; sound[1] = "sound/select2.au"; sound[2] = "sound/select3.au"; sound[3] = "sound/select4.au"; sound[4] = "sound/select5.au"; sound[5] = "sound/select6.au"; setLayout(new FlowLayout(FlowLayout.LEFT)); setBackground(Color.lightGray); b1 = new Button("Start Animation"); b2 = new Button(" Next "); reset(); add(b1); add(b2); cb_sound = new Checkbox("Voice Description"); cb_sound.setState(false); add(cb_sound); } /* * build in function to control events */ public boolean action(Event e, Object arg) { if (e.target instanceof Button) { String str = ((Button)(e.target)).getLabel(); if (str.equals("Start Animation")) { b1.disable(); cb_sound.disable(); MainArea.panel1.Next(); cb_sound.enable(); b2.enable(); } else if (str.equals(" Next ")) { b2.disable(); MainArea.panel2.Next(); if (voice) { /* applet.play(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); */ if (ac != null) ac.stop(); ac = applet.getAudioClip(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); ac.play(); } switch (MainArea.panel2.NextStep) { case 1: MainArea.panel1.Next(); break; default: } if (MainArea.panel2.AnimationNext[MainArea.panel2.NextStep]) { if (MainArea.panel2.NextStep < 5) b1.enable(); else { b2.setLabel("Restart"); b2.enable(); } } else { b2.enable(); } } else if (str.equals("Restart")) { MainArea.panel1.reset(); MainArea.panel2.reset(); b2.setLabel(" Next "); reset(); } else if (str.equals("Voice Description")) { System.out.println(applet.getCodeBase()); applet.play(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); } else if (str.equals("Disable Voice")) { voice = false; bsound.setLabel("Enable Voice"); } else if (str.equals("Enable Voice")) { voice = true; bsound.setLabel("Disable Voice"); applet.play(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); } } else if (e.target instanceof Checkbox) { Checkbox cb = (Checkbox)e.target; String str = cb.getLabel(); if (str.equals("Voice Description")) { if (cb.getState()) { voice = true; /* applet.play(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); */ if (ac != null) ac.stop(); ac = applet.getAudioClip(applet.getCodeBase(), sound[MainArea.panel2.NextStep]); ac.play(); } else { voice = false; ac.stop(); } } } return true; } /* * Purpose: reset this panel to the initial situation */ public void reset() { b1.enable(); b2.disable(); } }