java画图板用java编写绘图工具的代码

怎样在java画板实现喷墨

import java.awt.Graphics; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.util.Random; import javax.swing.JFrame; public class PenMo extends JFrame { public static void main(String[] args) { new PenMo(); } private boolean penmo;// 喷墨状态 private int mx, my;// 鼠标位置 private Random r = new Random();// 随机数生成器 public PenMo() { setSize(800, 600); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); addMouseListener(new MouseAction()); addMouseMotionListener(new MouseAction()); } @Override public void paint(Graphics g) { if (penmo) { for (int i = 0; i < 50; i++) {// 一次喷墨的颗粒个数50个. int dx;// dx是x方向偏移 int dy;// dy是y方向偏移 do { dx = r.nextInt(50) - 25;// 喷墨的半径在这改，50和下面的25. dy = r.nextInt(50) - 25; } while (dx * dx + dy * dy > 25 * 25); drawPoint(g, mx + dx, my + dy); } } } private void drawPoint(Graphics g, int px, int py) { g.drawLine(px, py, px, py); } private final class MouseAction extends MouseAdapter { @Override public void mousePressed(MouseEvent e) { mx = e.getX(); my = e.getY(); penmo = true; new RunAction().start(); } @Override public void mouseReleased(MouseEvent e) { penmo = false; } @Override public void mouseDragged(MouseEvent e) { if (penmo) { mx = e.getX(); my = e.getY(); } } private final class RunAction extends Thread { @Override public void run() { while (penmo) { try { repaint(); sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } } } } }

怎样用java编写画图板？

这个简单 填充颜色的话就是设置一下一个区域的背景颜色 画图就可以记录鼠标位置然后产生一条线 简单的很啊

用java编写绘图工具的代码

import java.applet.*; import java.awt.*; import java.awt.event.*; public class ResponseToMouse extends Applet implements ActionListener,MouseListener,MouseMotionListener { int xPos,yPos,k=0; Button btnDraw,btnClean,btnErase; public void init() { btnDraw = new Button("画图"); btnClean = new Button("清屏"); btnErase = new Button("擦除"); add(btnDraw); add(btnClean); add(btnErase); btnDraw.addActionListener(this); btnClean.addActionListener(this); btnErase.addActionListener(this); addMouseListener(this); addMouseMotionListener(this); } public void paint(Graphics g) { if(k==1) { g.setColor(Color.red); g.fillOval(xPos-5,yPos-5,10,10); } if(k==2) { super.update(g); } if(k==3) { g.setColor(Color.white); g.fillOval(xPos-5,yPos-5,10,10); } } public void actionPerformed(ActionEvent e){ if (e.getSource()==btnDraw) k=1; if(e.getSource()==btnClean){ k=2; repaint(); } if(e.getSource()==btnErase) k=3; } public void mouseClicked(MouseEvent e) { } public void mousePressed(MouseEvent e) { showStatus("鼠标键按下"); } public void mouseReleased(MouseEvent e) { showStatus("鼠标键释放"); } public void mouseEntered(MouseEvent e) { showStatus("鼠标进入"); } public void mouseExited(MouseEvent e) { showStatus("鼠标移出"); } public void mouseDragged(MouseEvent e) { xPos=e.getX(); yPos=e.getY(); repaint(); } public void mouseMoved(MouseEvent e) { showStatus("鼠标移动"); } public void update(Graphics g){ paint(g); } }