我的java课程设计报告之画图板

我的java课程设计报告
画图板
目录
1.项目背景/1
2.功能图/1
3.类图/1
4.源代码/1
5.运行结果/12
1.项目背景
本设计的目的是综合面向对象程序设计课程中所学到的知识来开发一个小型的Java应用程序—画图板。

本项目的开发工具是Eclipse 4.5。

2.功能图
3.类图
4.源代码
import java.applet.Applet;
import java.awt.*;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
2
import java.awt.event.WindowEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Properties;
import java.util.Vector;
import javax.imageio.ImageIO;
import javax.swing.JColorChooser;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class DrawPencil extends Applet
{
private static final long serialVersionUID = 1L;
Vector paintInfo = null;// 点信息向量组
int n = 1;
MediaTracker mt;
int x = -1, y = -1;
int con = 1;
int Econ = 5;
int toolFlag = 0;
Color c = new Color(0, 0, 0);
BasicStroke size = new BasicStroke(con, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL);
EveryPoint cutflag = new EveryPoint(-1, -1, c, 6, con);
Panel toolPanel;
Button eraser, drLine, drCircle, drRect;
Button clear, pen;
Choice ColChoice, SizeChoice, EraserChoice;
Button colchooser;
3
Label 颜色, 大小B, 大小E;
Button openPic, savePic;
FileDialog openPicture, savePicture;
public DrawPencil()
{
super();
}
public void init()
{
this.setSize(900, 600);
paintInfo = new Vector();
ColChoice = new Choice();
ColChoice.add("black");
ColChoice.add("red");
ColChoice.add("blue");
ColChoice.add("green");
ColChoice.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent e)
{
String name = ColChoice.getSelectedItem();
if (name == "black")
{
c = new Color(0, 0, 0);
}
else if (name == "red")
{
c = new Color(255, 0, 0);
}
else if (name == "green")
{
c = new Color(0, 255, 0);
}
else if (name == "blue")
{
c = new Color(0, 0, 255);
}
}
});
SizeChoice = new Choice();
SizeChoice.add("1");
4
SizeChoice.add("3");
SizeChoice.add("5");
SizeChoice.add("7");
SizeChoice.add("9");
SizeChoice.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent e)
{
String selected = SizeChoice.getSelectedItem();
if (selected == "1")
{
con = 1;
size = new BasicStroke(con, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
}
else if (selected == "3")
{
con = 3;
size = new BasicStroke(con, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
}
else if (selected == "5")
{
con = 5;
size = new BasicStroke(con, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
}
else if (selected == "7")
{
con = 7;
size = new BasicStroke(con, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
}
else if (selected == "9")
{
con = 9;
size = new BasicStroke(con, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
}
}
});
EraserChoice = new Choice();
EraserChoice.add("5");
EraserChoice.add("9");
5
EraserChoice.add("13");
EraserChoice.add("17");
EraserChoice.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent e)
{
String Esize = EraserChoice.getSelectedItem();
if (Esize == "5")
{
Econ = 5 * 2;
}
else if (Esize == "9")
{
Econ = 9 * 2;
}
else if (Esize == "13")
{
Econ = 13 * 2;
}
else if (Esize == "17")
{
Econ = 17 * 3;
}
}
});
toolPanel = new Panel();
clear = new Button("清除");
eraser = new Button("橡皮");
pen = new Button("画笔");
drLine = new Button("画直线");
drCircle = new Button("画圆形");
drRect = new Button("画矩形");
openPic = new Button("打开图画");
savePic = new Button("保存图画");
clear.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
toolFlag = 2;
paintInfo.removeAllElements();
repaint();
}
});
6
eraser.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// TODO自动生成方法存根
toolFlag = 1;
}
});
pen.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// TODO自动生成方法存根
toolFlag = 0;
}
});
drLine.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
toolFlag = 3;
}
});
drCircle.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
toolFlag = 4;
}
});
drRect.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
toolFlag = 5;
}
});
savePic.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
printPanelToJPG(toolPanel);
}
});
7
颜色 = new Label("画笔颜色", Label.CENTER);
大小B = new Label("画笔大小", Label.CENTER);
大小E = new Label("橡皮大小", Label.CENTER);
toolPanel.add(savePic);
toolPanel.add(pen);
toolPanel.add(drLine);
toolPanel.add(颜色);
toolPanel.add(ColChoice);
toolPanel.add(大小B);
toolPanel.add(SizeChoice);
toolPanel.add(eraser);
toolPanel.add(大小E);
toolPanel.add(EraserChoice);
toolPanel.add(clear);
this.add(toolPanel);
setBounds(60, 60, 900, 600);
setVisible(true);
validate();
this.addMouseMotionListener(new MouseMotionAdapter()
{
public void mouseDragged(MouseEvent e)
{
EveryPoint p1;
switch (toolFlag)
{
case 0:
x = (int) e.getX();
y = (int) e.getY();
p1 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p1);
repaint();
break;
case 1:
x = (int) e.getX();
y = (int) e.getY();
p1 = new EveryPoint(x, y, null, toolFlag, Econ);
paintInfo.addElement(p1);
repaint();
break;
default:
}
}
});
8
this.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
EveryPoint p2;
switch (toolFlag)
{
case 3:
x = (int) e.getX();
y = (int) e.getY();
p2 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;
case 4:
x = (int) e.getX();
y = (int) e.getY();
p2 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;
case 5:
x = (int) e.getX();
y = (int) e.getY();
p2 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;
default:
}
}
public void mouseReleased(MouseEvent e)
{
EveryPoint p3;
switch (toolFlag)
{
case 0:
paintInfo.addElement(cutflag);
break;
case 1:
paintInfo.addElement(cutflag);
break;
case 3:
x = (int) e.getX();
y = (int) e.getY();
p3 = new EveryPoint(x, y, c, toolFlag, con);
9
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;
case 4:
x = (int) e.getX();
y = (int) e.getY();
p3 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;
case 5:
x = (int) e.getX();
y = (int) e.getY();
p3 = new EveryPoint(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;
default:
}
}
});
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D) g;
EveryPoint p1, p2;
n = paintInfo.size();
if (toolFlag == 2)
g.clearRect(0, 0, getSize().width, getSize().height);// 清除
for (int i = 0; i < n - 1; i++)
{
p1 = (EveryPoint) paintInfo.elementAt(i);
p2 = (EveryPoint) paintInfo.elementAt(i + 1);
size = new BasicStroke(p1.boarder, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
g2d.setColor(p1.col);
g2d.setStroke(size);
if (p1.tool == p2.tool)
{
switch (p1.tool)
10
{
case 0:
Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x,
p2.y);
g2d.draw(line1);
break;
case 1:
g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);
break;
case 3:
Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x,
p2.y);
g2d.draw(line2);
break;
case 4:
Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math
.abs(p2.x - p1.x), Math.abs(p2.y - p1.y));
g2d.draw(ellipse);
break;
case 5:
Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math
.abs(p2.x - p1.x), Math.abs(p2.y - p1.y));
g2d.draw(rect);
break;
case 6:
i = i + 1;
break;
default:
}
}
}
}
public void update(Graphics g)
{
paint(g);
}
public void printPanelToJPG(Panel graph)
{
int width = this.getWidth();
int height = this.getHeight();
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2d = (Graphics2D) bi.createGraphics();
g2d = (Graphics2D) bi.getGraphics();
try
{
JFileChooser chooser = new JFileChooser(".//");
chooser.setAcceptAllFileFilterUsed(false);
chooser.setSelectedFile(new File("1.jpg"));
int status = chooser.showSaveDialog(graph);
if (status == JFileChooser.APPROVE_OPTION)
{
File saveFile = chooser.getSelectedFile();
if (saveFile.exists())
{
String prompt = "The file "
+ saveFile.getName()
+ " already exists. Do you want to replace the existing file";
int ret = JOptionPane.showConfirmDialog(graph, prompt,
"Warning", JOptionPane.YES_NO_OPTION);
if (ret == JOptionPane.NO_OPTION)
{
return;
}
}
saveFile = new File(saveFile.getAbsoluteFile() + ".jpg");
FileOutputStream fos = new FileOutputStream(saveFile);
JPEGImageEncoder jpegEncoder =
JPEGCodec.createJPEGEncoder(fos);
jpegEncoder.encode(bi);
fos.flush();
fos.close();
}
}
catch (IOException ex)
{
JOptionPane.showMessageDialog(graph, "IO Error, operation failed\n"
+ ex.toString(), "Error", JOptionPane.PLAIN_MESSAGE);
}
}
private Point Point(int i, int j)
{
Point point = new Point(i, j);
return point;
}
}
class EveryPoint implements Serializable
{
int x, y;
Color col;
int tool;
int boarder;
private static final long serialVersionUID = 1L;
EveryPoint(int x, int y, Color col, int tool, int boarder) {
this.x = x;
this.y = y;
this.col = col;
this.tool = tool;
this.boarder = boarder;
}
}
5.运行结果。