Java: Making of drawing board

After you've learned to use button sniffing and mouse listeners, we can make a own drawing board, the following is a simple drawing board I made before, the function is still insufficient, but has been able to complete the pencil, eraser, draw a straight line, circle and other basic work, but also to complete the free choice of color, Don't let yourself do it.

The first is the interface class:

Java code

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;//Set the initial color privat  
    e Color colorselector;  
    Private JButton colorselectorbu[]=new jbutton[6];  
    A new object is required to create the object, otherwise his default value is null private JPanel colorjp=new JPanel ();  
        public static void Main (String args[]) {Draw dr=new Draw ();  
    Dr.showframe ();        public void Showframe () {JPanel north=new JPanel (); Upper area, storing color buttons toand color selector JPanel west=new JPanel ();       Left area, storing graphics button JPanel center=new JPanel ();        Intermediate area, storing artboards JPanel south=new JPanel (); The area below to display the current mouse position and the size of the drawing//-----------------Middle Area---------------center.setlayout (New FlowLayout (F  
        Lowlayout.left);//sets the layout of the middle area to left-aligned JPanel drawjp=new JPanel ();  
        Drawjp.setbackground (Color.White);  
        Drawjp.setpreferredsize (New Dimension (600,500));  
        Center.add (DRAWJP);  
        -----------------Upper Area----------------JButton colorchooserbu=new JButton ("more Colors");  
        Colorchooserbu.addactionlistener (Colorlistener);  
        Colorjp.setpreferredsize (New Dimension (120,60));  
        Colorjp.setlayout (New GridLayout (3,6,0,0));  
                Create a color group colour 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); }//button selector custom color group for (int j=0;j<colorselectorbu.length;j++) {colorselectorbu[j]=new JB  
            Utton ();  
            Colorselectorbu[j].setpreferredsize (d);  
            Colorjp.add (Colorselectorbu[j]);  
        Colorselectorbu[j].addactionlistener (listener);  
        } north.add (COLORJP);  
        North.add (Colorchooserbu);  -----------------the left area----------------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=6) {//exceed six buttons, return 0 i=0;  
}  
        }  
    }; }

Here is the Listening class:

Java code