简化画板资料

import java awt import java awt event import javax swing import java io public class huahua extends JFrame DrawPanel drawingArea int index 0 drewings itemList new drewings 5000 Container c getContentPane public huahua super 简单画板 drawingArea new DrawPanel c add drawingArea BorderLayout CENTER itemList index new Penci setSize 500 500 setVisible true show public static void main String Strgs new huahua class mousea extends MouseAdapter public void mousePressed MouseEvent e itemList index x1 itemList index x2 e getX itemList index y1 itemList index y2 e getY index itemList index new Penci public void mouseReleased MouseEvent e itemList index x1 e getX itemList index y1 e getY 重新获取 x1y1 的值 虽然移动的时候 x1y1 在变但那时移动监听的不是 释放监听的 如果不重新获取坐标将变成默认的 0 0 itemList index x2 e getX itemList index y2 e getY repaint index itemList index new Penci public void mouseEntered MouseEvent e public void mouseExited MouseEvent e class mouseb extends MouseMotionAdapter public void mouseDragged MouseEvent e itemList index 1 x1 itemList index x2 itemList index x1 e getX itemList index 1 y1 itemList index y2 itemList index y1 e getY 按住移动是获取了 x1y1 的坐标但这坐标不会赋值给释放 动作不同不 会相互赋值 index itemList index new Penci repaint public void mouseMoved MouseEvent e class DrawPanel extends JPanel public DrawPanel setBackground Color white addMouseListener new mousea addMouseMotionListener new mouseb Override public void paintComponent Graphics g super paintComponent g Graphics2D g2d Graphics2D g 定义画笔 int j 0 while j index drew g2d itemList j j void drew Graphics2D g2d drewings i i drew g2d 将画笔传入到各个子类中 用来完成各自的绘图 class drewings implements Serializable int x1 y1 x2 y2 void drew Graphics2D g2d class Penci