如何在Appletcanvas上制作彩绘对象？
import java.awt.*; import java.applet.*; public class rain extends Applet { int i=0,j=0,k=0; AudioClip ac; public void init() { ac=getAudioClip(getCodeBase(),"rain.wav"); ac.play(); } public void paint(Graphics g) { setBackground(Color.darkGray); g.setColor(Color.gray); g.fillOval(100,100,75,25); g.fillOval(115,115,75,25); g.fillOval(115,85,75,25); g.fillOval(165,75,75,25); g.fillOval(165,125,75,25); g.fillOval(205,115,75,25); g.fillOval(205,85,75,25); g.fillOval(220,100,75,25); g.fillOval(160,95,80,35); g.setColor(Color.gray); g.fillOval(300,100,75,25); g.fillOval(315,115,75,25); g.fillOval(315,85,75,25); g.fillOval(365,75,75,25); g.fillOval(365,125,75,25); g.fillOval(405,115,75,25); g.fillOval(405,85,75,25); g.fillOval(420,100,75,25); g.fillOval(360,95,80,35); g.setColor(Color.gray); g.fillOval(500,100,75,25); g.fillOval(515,115,75,25); g.fillOval(515,85,75,25); g.fillOval(565,75,75,25); g.fillOval(565,125,75,25); g.fillOval(605,115,75,25); g.fillOval(605,85,75,25); g.fillOval(620,100,75,25); g.fillOval(560,95,80,35); g.setColor(Color.gray); g.fillOval(700,100,75,25); g.fillOval(715,115,75,25); g.fillOval(715,85,75,25); g.fillOval(765,75,75,25); g.fillOval(765,125,75,25); g.fillOval(805,115,75,25); g.fillOval(805,85,75,25); g.fillOval(820,100,75,25); g.fillOval(760,95,80,35); enter code here g.setColor(Color.cyan); for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,160,100+i,180); repaint(); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,200,100+i,220); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,240,100+i,260); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,280,100+i,300); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,320,100+i,340); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,360,100+i,380); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,400,100+i,420); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,440,100+i,460); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,480,100+i,500); } for(int i=0;i<=820;i=i+50) { g.drawLine(100+i,520,100+i,540); } g.setColor(Color.black); g.fillRect(0,590,1000,100); g.setColor(Color.white); for(i=0;i<=900;i=i+150) { g.fillRect(30+i,625,100,25); } g.setColor(new Color(139,69,19)); g.fillOval(100,600,35,15); g.fillOval(300,600,30,10); g.fillOval(500,600,25,10); g.fillOval(700,600,35,15); g.fillOval(125,650,35,15); g.fillOval(175,650,35,15); g.fillOval(230,670,35,15); g.fillOval(280,640,35,15); g.fillOval(340,630,35,9); g.fillOval(400,650,35,19); g.fillOval(450,610,35,10); g.fillOval(500,610,35,18); g.fillOval(600,675,35,17); g.fillOval(700,675,25,15); g.fillOval(710,675,30,15); g.fillOval(770,623,40,15); g.fillOval(690,655,25,15); g.fillOval(830,660,25,15); g.fillOval(810,670,23,15); g.fillOval(880,613,29,15); } } /* */ 如何使程序中只有for循环部分闪烁？ 我想闪烁各种for循环中包含的行。 或者请告诉任何其他方式闪烁程序的一部分..任何帮助将非常感谢。
让我们从Applet开始被弃用，请参阅Java插件支持已弃用并转到无插件Web以获取更多详细信息。
下一个等价物是Swing，就像大多数GUI框架一样，Swing是单线程的而且不是线程安全的，这意味着，你不能在他们的事件线程中执行阻塞或长时间运行的操作，也不应该尝试从事件外部更新他们的状态线程
有关更多详细信息，请参阅Swing中的并发 。
在Swing中，您可以选择一些选项，最简单的可能是Swing Timer ，有关详细信息，请参阅如何使用Swing Timers
现在，严格来说，这将改变循环中绘制的对象的线条颜色，使它们闪烁
import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class Test { public static void main(String[] args) { new Test(); } public Test() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private int count = 0; private Color lineColor = Color.DARK_GRAY; private Color[] lineColors = new Color[]{Color.CYAN, Color.DARK_GRAY}; public TestPane() { Timer timer = new Timer(500, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { count++; lineColor = lineColors[count % 2]; repaint(); } }); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(1000, 1000); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); setBackground(Color.darkGray); g2d.setColor(Color.gray); g2d.fillOval(100, 100, 75, 25); g2d.fillOval(115, 115, 75, 25); g2d.fillOval(115, 85, 75, 25); g2d.fillOval(165, 75, 75, 25); g2d.fillOval(165, 125, 75, 25); g2d.fillOval(205, 115, 75, 25); g2d.fillOval(205, 85, 75, 25); g2d.fillOval(220, 100, 75, 25); g2d.fillOval(160, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(300, 100, 75, 25); g2d.fillOval(315, 115, 75, 25); g2d.fillOval(315, 85, 75, 25); g2d.fillOval(365, 75, 75, 25); g2d.fillOval(365, 125, 75, 25); g2d.fillOval(405, 115, 75, 25); g2d.fillOval(405, 85, 75, 25); g2d.fillOval(420, 100, 75, 25); g2d.fillOval(360, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(500, 100, 75, 25); g2d.fillOval(515, 115, 75, 25); g2d.fillOval(515, 85, 75, 25); g2d.fillOval(565, 75, 75, 25); g2d.fillOval(565, 125, 75, 25); g2d.fillOval(605, 115, 75, 25); g2d.fillOval(605, 85, 75, 25); g2d.fillOval(620, 100, 75, 25); g2d.fillOval(560, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(700, 100, 75, 25); g2d.fillOval(715, 115, 75, 25); g2d.fillOval(715, 85, 75, 25); g2d.fillOval(765, 75, 75, 25); g2d.fillOval(765, 125, 75, 25); g2d.fillOval(805, 115, 75, 25); g2d.fillOval(805, 85, 75, 25); g2d.fillOval(820, 100, 75, 25); g2d.fillOval(760, 95, 80, 35); g2d.setColor(lineColor); for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 160, 100 + i, 180); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 200, 100 + i, 220); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 240, 100 + i, 260); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 280, 100 + i, 300); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 320, 100 + i, 340); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 360, 100 + i, 380); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 400, 100 + i, 420); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 440, 100 + i, 460); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 480, 100 + i, 500); } for (int i = 0; i <= 820; i = i + 50) { g2d.drawLine(100 + i, 520, 100 + i, 540); } g2d.setColor(Color.black); g2d.fillRect(0, 590, 1000, 100); g2d.setColor(Color.white); for (int i = 0; i <= 900; i = i + 150) { g2d.fillRect(30 + i, 625, 100, 25); } g2d.setColor(new Color(139, 69, 19)); g2d.fillOval(100, 600, 35, 15); g2d.fillOval(300, 600, 30, 10); g2d.fillOval(500, 600, 25, 10); g2d.fillOval(700, 600, 35, 15); g2d.fillOval(125, 650, 35, 15); g2d.fillOval(175, 650, 35, 15); g2d.fillOval(230, 670, 35, 15); g2d.fillOval(280, 640, 35, 15); g2d.fillOval(340, 630, 35, 9); g2d.fillOval(400, 650, 35, 19); g2d.fillOval(450, 610, 35, 10); g2d.fillOval(500, 610, 35, 18); g2d.fillOval(600, 675, 35, 17); g2d.fillOval(700, 675, 25, 15); g2d.fillOval(710, 675, 30, 15); g2d.fillOval(770, 623, 40, 15); g2d.fillOval(690, 655, 25, 15); g2d.fillOval(830, 660, 25, 15); g2d.fillOval(810, 670, 23, 15); g2d.fillOval(880, 613, 29, 15); g2d.dispose(); } } }
但是，看起来更好看的是，你可以让雨水落下来......
import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class Test { public static void main(String[] args) { new Test(); } public Test() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private final int limit = 100; private List droplets = new ArrayList<>(limit); public TestPane() { for (int index = 0; index < limit; index++) { droplets.add(new DropLet(150, 675)); } Timer timer = new Timer(5, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { Iterator it = droplets.iterator(); while (it.hasNext()) { DropLet dropLet = it.next(); if (dropLet.update(675)) { it.remove(); } } while (droplets.size() < limit) { droplets.add(new DropLet(150, 150)); } repaint(); } }); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(1000, 1000); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); setBackground(Color.darkGray); g2d.setColor(Color.gray); g2d.fillOval(100, 100, 75, 25); g2d.fillOval(115, 115, 75, 25); g2d.fillOval(115, 85, 75, 25); g2d.fillOval(165, 75, 75, 25); g2d.fillOval(165, 125, 75, 25); g2d.fillOval(205, 115, 75, 25); g2d.fillOval(205, 85, 75, 25); g2d.fillOval(220, 100, 75, 25); g2d.fillOval(160, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(300, 100, 75, 25); g2d.fillOval(315, 115, 75, 25); g2d.fillOval(315, 85, 75, 25); g2d.fillOval(365, 75, 75, 25); g2d.fillOval(365, 125, 75, 25); g2d.fillOval(405, 115, 75, 25); g2d.fillOval(405, 85, 75, 25); g2d.fillOval(420, 100, 75, 25); g2d.fillOval(360, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(500, 100, 75, 25); g2d.fillOval(515, 115, 75, 25); g2d.fillOval(515, 85, 75, 25); g2d.fillOval(565, 75, 75, 25); g2d.fillOval(565, 125, 75, 25); g2d.fillOval(605, 115, 75, 25); g2d.fillOval(605, 85, 75, 25); g2d.fillOval(620, 100, 75, 25); g2d.fillOval(560, 95, 80, 35); g2d.setColor(Color.gray); g2d.fillOval(700, 100, 75, 25); g2d.fillOval(715, 115, 75, 25); g2d.fillOval(715, 85, 75, 25); g2d.fillOval(765, 75, 75, 25); g2d.fillOval(765, 125, 75, 25); g2d.fillOval(805, 115, 75, 25); g2d.fillOval(805, 85, 75, 25); g2d.fillOval(820, 100, 75, 25); g2d.fillOval(760, 95, 80, 35); g2d.setColor(Color.black); g2d.fillRect(0, 590, 1000, 100); g2d.setColor(Color.white); for (int i = 0; i <= 900; i = i + 150) { g2d.fillRect(30 + i, 625, 100, 25); } g2d.setColor(new Color(139, 69, 19)); g2d.fillOval(100, 600, 35, 15); g2d.fillOval(300, 600, 30, 10); g2d.fillOval(500, 600, 25, 10); g2d.fillOval(700, 600, 35, 15); g2d.fillOval(125, 650, 35, 15); g2d.fillOval(175, 650, 35, 15); g2d.fillOval(230, 670, 35, 15); g2d.fillOval(280, 640, 35, 15); g2d.fillOval(340, 630, 35, 9); g2d.fillOval(400, 650, 35, 19); g2d.fillOval(450, 610, 35, 10); g2d.fillOval(500, 610, 35, 18); g2d.fillOval(600, 675, 35, 17); g2d.fillOval(700, 675, 25, 15); g2d.fillOval(710, 675, 30, 15); g2d.fillOval(770, 623, 40, 15); g2d.fillOval(690, 655, 25, 15); g2d.fillOval(830, 660, 25, 15); g2d.fillOval(810, 670, 23, 15); g2d.fillOval(880, 613, 29, 15); for (DropLet dropLet : droplets) { dropLet.paint(g2d); } g2d.dispose(); } public class DropLet { private Point location; private int yDelta; public DropLet(int from, int to) { location = new Point(100 + (int)(Math.random() * 800), from + (int)(Math.random() * (to - from))); yDelta = (int)(Math.random() * 5) + 1; } public boolean update(int range) { location.y += yDelta; return location.y > range; } public void paint(Graphics2D g2d) { g2d.setColor(Color.CYAN); g2d.fillOval(location.x - 3, location.y - 3, 6, 6); } } } }
虽然这可能看起来有些复杂，但这个概念非常基础。 你有一个DroplLet List ，它代表DroplLet的位置和它下降的速度。 您基本上循环遍历列表并update DropLet的位置，直到它们超出您想要的范围，此时它们将被删除。
“主回路”保持恒定数量的液滴，在这种情况下为100，以便它将继续下雨。
为了使事情更简单，液滴的位置和速度是随机的