JAVA编写简单画图程序

import java.awt.*; import java.awt.geom.*; import java.awt.event.*; import javax.swing.*; import java.io.*; import java.util.*; public class MyPanel extends JFrame { private ObjectInputStream input; private ObjectOutputStream output; private JButton choices[]; private String names[]={ "New", "Line", "DLine", "Circle", "DCircle", "Rect", "Fill", "Move", "Cutting", "Coloring", "Pixels", }; private String tipText[]={ "刷新", "画直线", "画虚线", "两点画一个圆", "画一个虚线圆", "画一个多边形", "填充一个多边形", "多边形的平移", "裁剪图形", "颜色", "设置线条粗细", }; JToolBar buttonPanel ; private JLabel statusBar; private DrawPanel drawingArea; private int width=700,height=500; drawings[] itemList=new drawings[5000]; private int currentChoice=1; int index=0,l=0,k=0,t=1; boolean m=false; public int x[]=new int[5],y[]=new int[5]; public Color color=Color.black; int R,G,B; private float stroke=1.0f; JComboBox styles; public MyPanel() { super("画图板"); drawingArea=new DrawPanel(); choices=new JButton[names.length]; buttonPanel = new JToolBar( JToolBar.VERTICAL ) ; buttonPanel = new JToolBar( JToolBar.HORIZONTAL) ; ButtonHandler handler=new ButtonHandler(); ButtonHandler1 handler1=new ButtonHandler1(); for(int i=0;i<choices.length;i++) { choices[i]=new JButton(names[i]); choices[i].setFont(new Font("宋体",Font.LAYOUT_NO_LIMIT_CONTEXT,12)); choices[i].setMargin( new Insets(0,0,0,0)); choices[i].setFocusable(false); choices[i].setToolTipText(tipText[i]); buttonPanel.add(choices[i]); } for(int i=1;i<choices.length-2;i++) { choices[i].addActionListener(handler); } choices[0].addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e) { newFile(); } } ); choices[choices.length-2].addActionListener(handler1); choices[choices.length-1].addActionListener(handler1); Container c=getContentPane(); c.add(buttonPanel,BorderLayout.NORTH); c.add(drawingArea,BorderLayout.CENTER); statusBar=new JLabel(); c.add(statusBar,BorderLayout.SOUTH); statusBar.setText(" Welcome To The Little Drawing Pad!!! :)"); createNewItem(); setSize(width,height); show(); } public class ButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { for(int j=1;j<choices.length-2;j++) { if(e.getSource()==choices[j]) { currentChoice=j; createNewItem(); repaint(); } } } } public class ButtonHandler1 implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getSource()==choices[choices.length-1]) { setStroke(); } if(e.getSource()==choices[choices.length-2]) { chooseColor(); } } } class mouseA extends MouseAdapter { public void mousePressed(MouseEvent e) { statusBar.setText(" Mouse Pressed @:[" + e.getX() + ", " + e.getY() + "]"); itemList[index].x1=itemList[index].x2=e.getX(); itemList[index].y1=itemList[index].y2=e.getY(); } public void mouseClicked(MouseEvent e) { statusBar.setText(" Mouse Pressed @:[" + e.getX() + ", " + e.getY() + "]"); if(m==true&&t==1) { x[l]=e.getX(); y[l]=e.getY(); if(l==4) { l=-1; } l++;k++; t=1; } if(t==0) { itemList[index].X=e.getX(); itemList[index].Y=e.getY(); t=1; } } public void mouseReleased(MouseEvent e)//鼠标松开的时候 { statusBar.setText(" Mouse Released @:[" + e.getX() + ", " + e.getY() + "]"); itemList[index].x2=e.getX(); itemList[index].y2=e.getY(); repaint(); index++; createNewItem(); } public void mouseEntered(MouseEvent e) { statusBar.setText(" Mouse Entered @:[" + e.getX() + ", " + e.getY() + "]"); } public void mouseExited(MouseEvent e) { statusBar.setText(" Mouse Exited @:[" + e.getX() + ", " + e.getY() + "]"); } } class mouseB extends MouseMotionAdapter { public void mouseDragged(MouseEvent e) { statusBar.setText(" Mouse Dragged @:[" + e.getX() + ", " + e.getY() + "]"); itemList[index].x2=e.getX(); itemList[index].y2=e.getY(); repaint(); } public void mouseMoved(MouseEvent e) { statusBar.setText(" Mouse Moved @:[" + e.getX() + ", " + e.getY() + "]"); } } class DrawPanel extends JPanel { public DrawPanel() { setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR)); setBackground(Color.white); addMouseListener(new mouseA()); addMouseMotionListener(new mouseB()); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d=(Graphics2D)g; int j=0; while (j<=index) { draw(g2d,itemList[j]); j++; } } void draw(Graphics2D g2d,drawings i) { i.draw(g2d); if(k%5==0) { i.draw(g2d,x,y); } if(t==1) { i.draw(g2d,x,y,m); } } } void createNewItem() { if(currentChoice==9) drawingArea.setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR)); else drawingArea.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR)); switch (currentChoice) { case 1: itemList[index]=new Line(); break; case 2: itemList[index]=new DLine(); break; case 3: itemList[index]=new Circle(); break; case 4: itemList[index]=new DCircle(); break; case 5: m=true; itemList[index]=new Rect(); break; case 6: itemList[index]=new Fill(); break; case 7: t=0; itemList[index]=new Move(); break; case 8: itemList[index]=new Cutting(); break; } //itemList[index].type=currentChoice; itemList[index].R=R; itemList[index].G=G; itemList[index].B=B; itemList[index].stroke=stroke; } public void chooseColor() { color=JColorChooser.showDialog(MyPanel.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; } public void setStroke() { String input; input=JOptionPane.showInputDialog( "Please input a float stroke value! ( >0 )"); stroke=Float.parseFloat(input); itemList[index].stroke=stroke; } public void newFile() { index=0; currentChoice=1; color=Color.black; stroke=1.0f; createNewItem();