用j2se写的简单的画图软件Draw0.6

 

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.*;

public class Painter extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private static final int X = 100;
    private static final int Y = 100;
    private static final int WIDTH = 600;
    private static final int HEIGHT = 450;
    private int  judge = 0;
    private Drawing itemList[] = new Drawing[5000];
    private int index = 0;
    private Paint drawingArea = new Paint();
    private JToolBar buttonPanel;
    private JButton choices[];
    private JLabel mouseAction ;
    private int R,G,B;
    private Color color = Color.black;
    private float stroke = 1.0f;
    private static String names[] = {
        "铅笔","橡皮擦","清除","直线","空心矩形","实心矩形",
        "空心圆","实心圆","空心椭圆","实心椭圆","调色盒","线条粗细"
    };

    public Painter() {
        createNewItem();
        this.setTitle("画图");
        this.setBounds(X, Y, WIDTH, HEIGHT);
        choices = new JButton[names.length];
        buttonPanel = new JToolBar(JToolBar.HORIZONTAL);
        buttonPanel.setFloatable(false);
        for(int i = 0;i<names.length;i++) {
            choices[i] = new JButton(names[i]);
            buttonPanel.add(choices[i]);
            choices[i].addActionListener(this);
        }
        this.setLayout(new BorderLayout());
        mouseAction = new JLabel();
        add(buttonPanel,BorderLayout.NORTH);
        add(drawingArea,BorderLayout.CENTER);
        add(mouseAction,BorderLayout.SOUTH);
        setVisible(true);
        this.addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }

        });
    }

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
        }// 将界面设置为当前windows风格
        new Painter();

    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if ((e.getActionCommand()).equals("铅笔")) {
            judge = 0;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("橡皮擦")) {
            judge = 1;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("清除")) {
            index = 0;
            judge = 0;
            createNewItem();
            repaint();// 将有关值设置为初始状态，并且重画

        }
        if ((e.getActionCommand()).equals("直线")) {
            judge = 2;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("空心矩形")) {
            judge = 3;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("实心矩形")) {
            judge = 4;
            createNewItem();
            repaint();
        }

        if ((e.getActionCommand()).equals("空心圆")) {
            judge = 5;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("实心圆")) {
            judge = 6;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("空心椭圆")) {
            judge = 7;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("实心椭圆")) {
            judge = 8;
            createNewItem();
            repaint();
        }
        if ((e.getActionCommand()).equals("调色盒")) {
            this.colorChooser();
        }
        if ((e.getActionCommand()).equals("线条粗细")) {
            this.setStroke();
        }



    }

    public void colorChooser () {
        try {
            color = JColorChooser.showDialog(Painter.this, "Choose a color",
                    color);
            R = color.getRed();
            G = color.getGreen();
            B = color.getBlue();
            itemList[index].R = R;
            itemList[index].G = G;
            itemList[index].B = B;

        }catch (NullPointerException e) {

        }

    }

    public void setStroke() {
        try {
            String input = null;
            input = JOptionPane
            .showInputDialog("Please input a float stroke value! ( >0 )");
            stroke = Float.parseFloat(input);
            itemList[index].stroke = stroke;
        }catch (NullPointerException e) {

        }catch(NumberFormatException e) {
            JOptionPane.showMessageDialog(null, "输入值为空", "提示", JOptionPane.ERROR_MESSAGE);
        }
    }

    private void createNewItem() {

        if (judge == 0) {
            itemList[index] = new Pen();
        }
        else if (judge == 1) {
            itemList[index] = new Rubber();
        }
        else if (judge == 2) {
            itemList[index] = new Line();
        }
        else if (judge == 3) {
            itemList[index] = new Rect();
        }
        else if (judge == 4) {
            itemList[index] = new fillRect();
        }
        else if (judge == 5) {
            itemList[index] = new Circle();
        }
        else if (judge == 6) {
            itemList[index] = new fillCircle();
        }
        else if (judge == 7) {
            itemList[index] = new Oval();
        }
        else if (judge == 8) {
            itemList[index] = new fillOval();
        }
        else {

        }
        itemList[index].R = R;
        itemList[index].G = G;
        itemList[index].B = B;
        itemList[index].stroke = stroke;
    }

    private class Paint extends JPanel {

        private static final long serialVersionUID = 1L;

        public Paint() {
            this.setBackground(Color.WHITE);
            setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
            addMouseMotionListener(new MouseAdapter() {


                @Override
                public void mouseMoved(MouseEvent e) {
                    mouseAction.setText("MouseMoved@ [X:"+e.getX()+"Y:"+e.getY()+"]");
                }

                public void mouseDragged(MouseEvent e) {
                    mouseAction.setText("MouseDragged@ [X:"+e.getX()+"Y:"+e.getY()+"]");

                    if (judge == 0||judge == 1) {
                        itemList[index - 1].sx = itemList[index].ex = itemList[index].sx = e
                                .getX();
                        itemList[index - 1].sy = itemList[index].ey = itemList[index].sy = e
                                .getY();
                        index++;
                        createNewItem();
                    } else {
                        itemList[index].ex = e.getX();
                        itemList[index].ey = e.getY();
                    }
                    repaint();
                }
            });
            addMouseListener(new MouseAdapter() {

                @Override
                public void mouseExited(MouseEvent e) {
                    mouseAction.setText("MouseExited@ [X:"+e.getX()+"Y:"+e.getY()+"]");
                }
                public void mouseClicked(MouseEvent e) {
                    mouseAction.setText("MouseClicked@ [X:"+e.getX()+"Y:"+e.getY()+"]");
                }

                public void mousePressed(MouseEvent e) {
                    mouseAction.setText("MousePressed@ [X:"+e.getX()+"Y:"+e.getY()+"]");

                    //itemList[index].sx = itemList[index].ex = e.getX();
                    //itemList[index].sy = itemList[index].ey = e.getY();

                    if (judge == 0||judge == 1) {
                        itemList[index].sx = itemList[index].ex = e.getX();
                        itemList[index].sy = itemList[index].ey = e.getY();
                        index++;
                        createNewItem();
                    }else {
                        itemList[index].sx = itemList[index].ex = e.getX();
                        itemList[index].sy = itemList[index].ey = e.getY();
                    }

                }

                public void mouseReleased(MouseEvent e) {
                    mouseAction.setText("MouseReleased@ [X:"+e.getX()+"Y:"+e.getY()+"]");

                    if (judge == 0||judge == 1) {
                        itemList[index].sx = e.getX();
                        itemList[index].sy = e.getY();
                    }

                    itemList[index].ex = e.getX();
                    itemList[index].ey = e.getY();
                    repaint();
                    index++;
                    createNewItem();

                }
            });

            setVisible(true);

        }


        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g;
            for(int i=0;i<=index;i++) {
                draw(g2d, itemList[i]);
            }
            /*int j = 0;
            while (j <= index) {
                draw(g2d, itemList[j]);
                j++;
            }*/
        }

        void draw(Graphics2D g2d, Drawing i) {
            i.draw(g2d);// 将画笔传入到各个子类中，用来完成各自的绘图
        }

    }
}



import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;

public class Drawing {
    int sx, sy, ex, ey;
    int R,G,B;
    float stroke;

    public void draw(Graphics2D g) {

    }

}

class Rect extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.drawRect(Math.min(sx, ex), Math.min(sy, ey), Math.abs(sx - ex),
                Math.abs(sy - ey));
    }
}

class fillRect extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.fillRect(Math.min(sx, ex), Math.min(sy, ey), Math.abs(sx - ex),
                Math.abs(sy - ey));
    }
}

class Oval extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.drawOval(Math.min(sx, ex), Math.min(sy, ey), Math.abs(ex - sx),
                Math.abs(ey - sy));
    }
}

class fillOval extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.fillOval(Math.min(sx, ex), Math.min(sy, ey), Math.abs(ex - sx),
                Math.abs(ey - sy));
    }
}

class Circle extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.drawOval(Math.min(sx, ex), Math.min(sy, ey), Math.abs(ey - sy),
                Math.abs(ey - sy));
    }
}

class fillCircle extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.fillOval(Math.min(sx, ex), Math.min(sy, ey), Math.abs(ex - sx),
                Math.abs(ex - sx));
    }
}

class Pen extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.drawLine(sx, sy, ex, ey);
    }
}
class Line extends Drawing {

    public void draw(Graphics2D g) {
        g.setPaint(new Color(R,G,B));
        g.setStroke(new BasicStroke(stroke, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g.drawLine(sx, sy, ex, ey);
    }
}
class Rubber extends Drawing {
    public void draw(Graphics2D g2d) {
        g2d.setPaint(new Color(255, 255, 255));
        g2d.setStroke(new BasicStroke(stroke + 5, BasicStroke.CAP_ROUND,
                BasicStroke.JOIN_BEVEL));
        g2d.drawLine(sx, sy, ex, ey);
    }
}