import java.applet.Applet; import java.applet.AudioClip; import java.awt.Color; import java.awt.Dimension; import java.awt.Event; import java.awt.Font; import java.awt.Graphics; import java.awt.Image; /** * Class: Pang * Author: Walter Korman * Date: 1/26/97 * * Thy heart dost yearn for the days of old, the days of yore. * Thou dost ponder endlessly the ways of the world, yet to no * avail. Beeps, boops and bops cannot help thee here. * * A deeply magical remake of a classic video game. */ public class Pang extends Applet implements Runnable { /* Following are workarounds for font size calculations, as Netscape * reports unappealing font height/ascents on varying platforms. */ static final int FIXED_FONT_HEIGHT = 12; static final int FIXED_FONT_ASCENT = 6; static final String STRING_DEMO = new String("( click to begin game )"); static final int MODE_DEMO = 1; /* Game mode while showing demo */ static final int MODE_GAME = 2; /* Game mode while playing game */ static final int ROLL_MINSTEPS = 400;/* min # screen updates btwn rolls */ static final int ROLL_MAXSPEED = 5; /* max speed of screen roll */ static final int HELP_STEPS = 150; /* # screen updates before hide help */ static final int NUM_NOISE = 30; /* # of noise dots on-screen */ static final int DELAY_LOST = 50; /* # screen upd. btwn lost and launch */ static final int DELAY_UPDATE = 30; /* ms delay between screen upd. */ boolean _running; Image _offImage; Graphics _offGraphics; Thread _t; Paddle _comp_pad, _player_pad; Ball _ball; Dimension _d; int _mode; int _demo_strwidth; VHoldLine _v_line; PangText _title_str; boolean _rolling; int _roll_v, _roll_speed, _steps; int _noise_x[], _noise_y[]; int _lost_steps, _help_steps; AudioClip _snd_bop, _snd_bop2, _snd_lost; boolean _show_vhold_line = false; boolean _show_screen_roll = false; boolean _show_noise = false; /** * init * * Initialize the applet. */ public void init () { int i; String str; _d = size(); _offImage = createImage(_d.width, _d.height); _offGraphics = _offImage.getGraphics(); /* Set up font info */ _offGraphics.setFont(new Font("Helvetica", Font.PLAIN, FIXED_FONT_HEIGHT)); _demo_strwidth = (_offGraphics.getFontMetrics()).stringWidth(STRING_DEMO); /* Load sounds */ _snd_bop = getAudioClip(getCodeBase(), "audio/bop.au"); _snd_bop2 = getAudioClip(getCodeBase(), "audio/bop2.au"); _snd_lost = getAudioClip(getCodeBase(), "audio/lost.au"); /* Create paddles */ _comp_pad = new Paddle(_d.width - (Paddle.PAD_WIDTH * 2), (_d.height - Paddle.PAD_HEIGHT) / 2, _d, _snd_bop2); _player_pad = new Paddle(Paddle.PAD_WIDTH * 2, (_d.height - Paddle.PAD_HEIGHT) / 2, _d, _snd_bop2); /* Create V-hold line */ _v_line = new VHoldLine(_d); /* Create title string */ _title_str = new PangText(_d.width / 2, _d.height / 2, _d); /* Init game data */ _mode = MODE_DEMO; _rolling = false; _help_steps = _lost_steps = _steps = _roll_v = 0; _noise_x = new int[NUM_NOISE]; _noise_y = new int[NUM_NOISE]; for(i = 0; i < NUM_NOISE; i++) { _noise_x[i] = (int) (Math.random() * 1000.0) % _d.width; _noise_y[i] = (int) (Math.random() * 1000.0) % _d.height; } /* Read applet parameters */ /* Read V-Hold flag */ str = getParameter("vHold"); _show_vhold_line = (str != null && str.equals("true")); /* Read screen-roll flag */ str = getParameter("screenRoll"); _show_screen_roll = (str != null && str.equals("true")); /* Read noise flag */ str = getParameter("noise"); _show_noise = (str != null && str.equals("true")); } /** * start * * Start the main applet thread. */ public void start () { _running = true; _t = new Thread(this); _t.start(); } /** * stop * * Stop the applet. */ public void stop () { _running = false; } /** * startBall * * Launch a new ball from the middle of the playing area, with a * random h/v velocity. */ public void startBall() { int h, v; if(Math.random() > 0.5) { _ball = new Ball(_player_pad.h + Paddle.PAD_WIDTH + Ball.BALL_WIDTH + 5, ((int) (Math.random() * 1000.0) % (_d.height - Ball.BALL_HEIGHT)), _d, _snd_bop, _snd_lost); } else { _ball = new Ball(_comp_pad.h - Ball.BALL_WIDTH - 5, ((int) (Math.random() * 1000.0) % (_d.height - Ball.BALL_HEIGHT)), _d, _snd_bop, _snd_lost); _ball.vel_h = -_ball.vel_v; } if(Math.random() > 0.5) { _ball.vel_v = -_ball.vel_v; } _lost_steps = 0; _ball.setSoundOn(_mode == MODE_GAME); } /** * checkRoll * * Check whether to begin new screen roll. If so, generate random params * for the roll. */ public void checkRoll() { _steps++; if(_steps % ROLL_MINSTEPS == 0) { _steps = 0; _rolling = Math.random() > 0.5; if(_rolling == true) { _roll_speed = (int) (Math.random() * 10.0) % ROLL_MAXSPEED + 1; } } } /** * updateRoll * * Increment the screen roll and draw lines denoting edge of screen. */ public void updateRoll(Graphics g) { /* Draw lines at bottom of screen so roll edge is visible */ if(Math.random() > 0.5) { g.drawLine(0, _d.height - 1, _d.width, _d.height - 1); } if(Math.random() > 0.3) { g.drawLine(0, _d.height - 2, _d.width, _d.height - 2); } _roll_v += _roll_speed; if(_roll_v >= _d.height) { _roll_v = 0; _rolling = false; } } /** * run * * Main body of Pang applet. */ public void run () { startBall(); while(_running) { _ball.move(); if(_ball.getStatus() != Ball.STATUS_IN_PLAY) { _lost_steps++; if(_lost_steps % DELAY_LOST == 0) { startBall(); _comp_pad.chooseBrain(); _player_pad.chooseBrain(); } } _comp_pad.lookForBall(_ball); _comp_pad.move(); _comp_pad.checkCollision(_ball); if(_mode == MODE_DEMO) { _player_pad.lookForBall(_ball); _title_str.move(); } _player_pad.move(); _player_pad.checkCollision(_ball); if(_show_vhold_line == true) { _v_line.move(); } repaint(); try { _t.sleep(DELAY_UPDATE); } catch(InterruptedException e) { } } } /** * update * * Draw current game state into offscreen, and copy offscreen to * main applet display. */ public void update (Graphics g) { int i; /* Wipe offscreen graphics image */ _offGraphics.setColor(Color.darkGray); _offGraphics.fillRect(0, 0, _d.width, _d.height); _offGraphics.setColor(Color.white); /* Paint paddles */ _player_pad.paint(_offGraphics); if(_player_pad.getDispHelp() == true) { _help_steps++; if(_help_steps % HELP_STEPS == 0) { _player_pad.setDispHelp(false); } } _comp_pad.paint(_offGraphics); /* Paint ball */ _ball.paint(_offGraphics); /* Draw demo info if appropriate */ if(_mode == MODE_DEMO) { _offGraphics.drawString(STRING_DEMO, (_d.width - _demo_strwidth) / 2, (_d.height - FIXED_FONT_HEIGHT) / 2); _title_str.paint(_offGraphics); } if(_show_noise == true) { _offGraphics.setColor(Color.gray); for(i = 0; i < NUM_NOISE; i++) _offGraphics.fillRect(_noise_x[i], _noise_y[i], 2, 2); for(i = 0; i < NUM_NOISE; i++) { _noise_x[i] = (_noise_x[i] + (int) (2-Math.random()*3.9))%_d.width; _noise_y[i] = (_noise_y[i] + (int) (2-Math.random()*3.9))%_d.height; } } /* Perchance we're on a roll...? */ if(_show_screen_roll == true) { _offGraphics.setColor(Color.lightGray); if(_rolling == true) updateRoll(_offGraphics); else checkRoll(); } g.drawImage(_offImage, 0, -_roll_v, null); g.drawImage(_offImage, 0, _d.height - _roll_v, null); /* Paint V-Hold Line */ if(_show_vhold_line == true) _v_line.paint(g); } /** * paint * * Paint the applet, drawing offscreen to screen. */ public void paint (Graphics g) { g.drawImage(_offImage, 0, 0, null); } /** * mouseUp * * Handle mouseUp event. Starts game play. */ public boolean mouseUp(Event e, int x, int y) { if(_mode == MODE_DEMO) { _player_pad.setControl(Paddle.CONTROL_PLAYER); _player_pad.setDispHelp(true); _help_steps = 1; _mode = MODE_GAME; startBall(); } else { _player_pad.setControl(Paddle.CONTROL_COMPUTER); _player_pad.setDispHelp(false); _mode = MODE_DEMO; } _ball.setSoundOn(_mode == MODE_GAME); _comp_pad.setSoundOn(_mode == MODE_GAME); _player_pad.setSoundOn(_mode == MODE_GAME); return true; } /** * mouseMove * * Handle mouseMove event. Controls player paddle if game in progress. */ public boolean mouseMove(Event e, int x, int y) { if(_mode == MODE_DEMO) return false; _player_pad.setDestination(y); return true; } };