java实现烟花效果

import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.util.Random; import java.util.TreeSet; import javax.swing.Timer; class Canvas extends java.awt.Canvas { // Download by http://www.codefans.net double gravity = 1.0; double damp = 0.75; double skyrocketVelocity = -82; int skyrocketWidth = 4; int skyrocketHeight = 8; int pieceNumber = 200; double pieceInitialVelocity = 72; double pieceDarkerFactor = 0.90; int pieceWidth = 1; int pieceHeight = 2; double traceDarkerFactor = 0.70; int frameDelay = 40; int border = 10; Random random = new Random( System.currentTimeMillis() ); int currentTime; TreeSet things = new TreeSet(); Skyrocket currentSkyrocket; Image offscreenImage; Graphics offscreenGraphics; void init() { setBackground( Color.BLACK ); offscreenImage = createImage( getWidth(), getHeight() ); offscreenGraphics = offscreenImage.getGraphics(); addMouseListener( new MouseAdapter() { public void mousePressed( MouseEvent e ) { onMousePress( e ); } public void mouseReleased( MouseEvent e ) { onMouseRelease( e ); } } ); addKeyListener( new KeyAdapter() { public void keyPressed( KeyEvent e ) { onKeyPress( e ); } } ); new Timer( frameDelay, new ActionListener() { public void actionPerformed( ActionEvent e ) { repaint(); } } ).start(); requestFocus(); } void onMousePress( MouseEvent e ) { if( currentSkyrocket != null ) currentSkyrocket.explode(); int r = random.nextInt( 256 ); int g = random.nextInt( 256 ); int b = random.nextInt( 256 ); int max = r > g ? r : g; max = max > b ? max : b; double brighter = 255.0 / max; r = (int) ( r * brighter ); g = (int) ( g * brighter ); b = (int) ( b * brighter ); Color color = new Color( r, g, b ); currentSkyrocket = new Skyrocket( this, color, e.getX() ); things.add( currentSkyrocket ); } void onMouseRelease( MouseEvent e ) { if( currentSkyrocket != null ) { currentSkyrocket.explode(); currentSkyrocket = null; } } void onKeyPress( KeyEvent e ) { if( e.getKeyCode() == KeyEvent.VK_Q ) { gravity += 0.01; } if( e.getKeyCode() == KeyEvent.VK_A ) { gravity -= 0.01; if(gravity<0) gravity=0; } if( e.getKeyCode() == KeyEvent.VK_W ) { damp += 0.01; if(damp>1) damp=1; } if( e.getKeyCode() == KeyEvent.VK_S ) { damp -= 0.01; if(damp<0) damp=0; } if( e.getKeyCode() == KeyEvent.VK_E ) { skyrocketVelocity -= 1; } if( e.getKeyCode() == KeyEvent.VK_D ) { skyrocketVelocity += 1; if(skyrocketVelocity>0) skyrocketVelocity=0; } if( e.getKeyCode() == KeyEvent.VK_R ) { skyrocketWidth += 1; } if( e.getKeyCode() == KeyEvent.VK_F ) { skyrocketWidth -= 1; if(skyrocketWidth<1) skyrocketWidth=1; } if( e.getKeyCode() == KeyEvent.VK_T ) { skyrocketHeight += 1; } if( e.getKeyCode() == KeyEvent.VK_G ) { skyrocketHeight -= 1; if(skyrocketHeight<1) skyrocketHeight=1; } if( e.getKeyCode() == KeyEvent.VK_Y ) { pieceNumber += 10; } if( e.getKeyCode() == KeyEvent.VK_H ) { pieceNumber -= 10; if(pieceNumber<0) pieceNumber=0; } if( e.getKeyCode() == KeyEvent.VK_U ) { pieceInitialVelocity += 1; } if( e.getKeyCode() == KeyEvent.VK_J ) { pieceInitialVelocity -= 1; if(pieceInitialVelocity<0) pieceInitialVelocity=0; } if( e.getKeyCode() == KeyEvent.VK_I ) { pieceDarkerFactor += 0.01; if(pieceDarkerFactor>1) pieceDarkerFactor=1; } if( e.getKeyCode() == KeyEvent.VK_K ) { pieceDarkerFactor -= 0.01; if(pieceDarkerFactor<0) pieceDarkerFactor=0; } if( e.getKeyCode() == KeyEvent.VK_O ) { pieceWidth += 1; } if( e.getKeyCode() == KeyEvent.VK_L ) { pieceWidth -= 1; if(pieceWidth<1) pieceWidth=1; } if( e.getKeyCode() == KeyEvent.VK_P ) { pieceHeight += 1; } if( e.getKeyCode() == KeyEvent.VK_SEMICOLON ) { pieceHeight -= 1; if(pieceHeight<1) pieceHeight=1; } if( e.getKeyCode() == KeyEvent.VK_OPEN_BRACKET ) { traceDarkerFactor += 0.01; if(traceDarkerFactor>1) traceDarkerFactor=1; } if( e.getKeyCode() == KeyEvent.VK_QUOTE ) { traceDarkerFactor -= 0.01; if(traceDarkerFactor<0) traceDarkerFactor=0; } System.out.println( "g"+(int)(gravity*100)+" "+ "d"+(int)(damp*100)+" "+ "sv"+(int)(-skyrocketVelocity*1)+" "+ "sw"+(int)(skyrocketWidth*1)+" "+ "sh"+(int)(skyrocketHeight*1)+" "+ "pn"+(int)(pieceNumber*1)+" "+ "pv"+(int)(pieceInitialVelocity*1)+" "+ "pf"+(int)(pieceDarkerFactor*100)+" "+ "pw"+(int)(pieceWidth*1)+" "+ "ph"+(int)(pieceHeight*1)+" "+ "tf"+(int)(traceDarkerFactor*100) ); } public void update( Graphics g ) { paint( g ); } long totalPaintTime; public void paint( Graphics g ) { if( offscreenImage == null ) return; long time1 = System.currentTimeMillis(); System.gc(); long time2 = System.currentTimeMillis(); offscreenGraphics.clearRect( 0, 0, getWidth(), getHeight() ); TreeSet things2 = new TreeSet(); while( ! things.isEmpty() ) { Thing thing = (Thing) things.first(); things.remove( thing ); thing.paint(); if( thing.stateDead || thing.stateX<-border || thing.stateY>getWidth()+border || thing.stateY<-border || thing.stateY>getHeight()+border ) { } else { things2.add( thing ); } } things = things2; g.drawImage( offscreenImage, 0, 0, this ); long time3 = System.currentTimeMillis(); totalPaintTime += time3 - time1; currentTime++; //System.out.println( "("+(time2-time1)+") "+totalPaintTime+" / "+currentTime+" = "+totalPaintTime/currentTime ); } }