首页 / 软件开发 / JAVA / java:画图板的制作

import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.ButtonGroup;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JColorChooser;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JRadioButton;@SuppressWarnings（"serial"）public class Draw extends JFrame{public Color color=Color.BLACK;//设置初始颜色private Color colorselector;private JButton colorselectorbu[]=new JButton[6];//创建对象时需要new一个对象，否则他的默认值就是NULLprivate JPanel colorjp=new JPanel（）;public static void main（String args[]）{Draw dr=new Draw（）;dr.showframe（）;}public void showframe（）{JPanel north=new JPanel（）;//上方区域，存放颜色按钮以及颜色选择器JPanel west=new JPanel（）; //左边区域，存放图形按钮 JPanel center=new JPanel（）; //中间区域，存放画板JPanel south=new JPanel（）;//下面区域，用来显示当前鼠标所在前位置以及所画图形的大小//-----------------中间区域---------------center.setLayout（new FlowLayout（FlowLayout.LEFT））;//将中间区域的布局设置为左对齐JPanel drawjp=new JPanel（）;drawjp.setBackground（Color.white）;drawjp.setPreferredSize（new Dimension（600,500））;center.add（drawjp）;//-----------------上方区域----------------JButton colorchooserbu=new JButton（"更多颜色"）;colorchooserbu.addActionListener（colorlistener）;colorjp.setPreferredSize（new Dimension（120,60））;colorjp.setLayout（new GridLayout（3,6,0,0））;//创建一个颜色组Color color[]=new Color[]{Color.BLACK,Color.BLUE,Color.CYAN,Color.DARK_GRAY,Color.GRAY,Color.GREEN,Color.LIGHT_GRAY,Color.GREEN,Color.MAGENTA,Color.ORANGE,Color.PINK,Color.YELLOW};Dimension d=new Dimension（20,20）;for（int i=0;i<color.length;i++）{JButton colorbu=new JButton（）;colorbu.setBackground（color[i]）;colorbu.setPreferredSize（d）;colorjp.add（colorbu）;colorbu.addActionListener（listener）;}//按钮选择器的自定义颜色组for（int j=0;j<colorselectorbu.length;j++）{colorselectorbu[j]=new JButton（）;colorselectorbu[j].setPreferredSize（d）;colorjp.add（colorselectorbu[j]）;colorselectorbu[j].addActionListener（listener）;}north.add（colorjp）;north.add（colorchooserbu）;//-----------------左边区域----------------String img[]=new String[]{"Line", "oval", "rect", "roundrect", "eraser", "fill","pencil", "select"}; String img1[]=new String[]{"Line1","oval1","rect1","roundrect1","eraser1","fill1","pencil1","select1"};ButtonGroup bg=new ButtonGroup（）;for（int i=0;i<img.length;i++）{//创建Icon组ImageIcon shapeicon=new ImageIcon（"back/"+img[i]+".jpg"）;ImageIcon shapeicon1=new ImageIcon（"back/"+img1[i]+".jpg"）;JRadioButton shapebu=new JRadioButton（shapeicon）;bg.add（shapebu）;shapebu.setPressedIcon（shapeicon1）;//设置选中时的图案shapebu.setSelectedIcon（shapeicon1）;shapebu.setActionCommand（img[i]）;west.add（shapebu）;}//---------------下方区域-------------JLabel la1=new JLabel（）;JLabel la2=new JLabel（）;JLabel la3=new JLabel（"600x500像素"）;JLabel la4=new JLabel（）;south.add（la4）;south.add（la1）;south.add（la2）;south.add（la3）;south.setLayout（new GridLayout（1,4,20,20））;north.setPreferredSize（new Dimension（200,80））;west.setPreferredSize（new Dimension（80,200））;south.setPreferredSize（new Dimension（200,20））;north.setBackground（Color.GRAY）;west.setBackground（Color.DARK_GRAY）;center.setBackground（Color.LIGHT_GRAY）;south.setBackground（Color.WHITE）;this.setLayout（new BorderLayout（））;this.add（north,BorderLayout.NORTH）;this.add（west,BorderLayout.WEST）;this.add（south,BorderLayout.SOUTH）;this.add（center,BorderLayout.CENTER）;this.setTitle（"画图板复习"）;this.setSize（900,700）;this.setLocationRelativeTo（null）;this.setDefaultCloseOperation（3）;this.setVisible（true）;//在画板上获取画布权限Graphics g=drawjp.getGraphics（）;DrawListener listener=new DrawListener（g,bg,this,la1,la2）;drawjp.addMouseListener（listener）;drawjp.addMouseMotionListener（listener）;}//添加按钮监听，获取按钮的背景颜色ActionListener listener=new ActionListener（）{public void actionPerformed（ActionEvent e） {//获取事件源，发生事件的对象Object obj=e.getSource（）;if（obj instanceof JButton）{color=（（JButton） obj）.getBackground（）;}}};ActionListener colorlistener=new ActionListener（）{//按钮数组累加器int i = 0;public void actionPerformed（ActionEvent e）{colorselector=JColorChooser.showDialog（null, "颜色选择器", Color.BLACK）;colorselectorbu[i].setBackground（colorselector）;i++;if（i>=6）{//超出六个按钮,返回0i=0;}}};}