java圆和矩形绘图代码 java编程画圆参数

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求java绘图程序源代码（加注释），在如下图的基础上，在图案种类上添加圆角矩形，求代码

直线是 Line2D

矩形是 Rectangle2D

弧 Arc2D

椭圆 Ellipse2D

圆角矩形是 RoundRectangle2D

上面java圆和矩形绘图代码的都在 java.awt.geom包里

相关问答

Q1: 编写Java Applet程序画圆矩形和直线，继承实现（多态实现）各个类都能实现构造方法

PainterPanel.java 代码:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

public class PainterPanel extends JPanel implements MouseListener{

int shape=-1; //图案类型

Point[] point=new Point[2]; //记录鼠标拖动java圆和矩形绘图代码的起始点和终点

public PainterPanel(){

super(); //调用父类构造函数

this.setBackground(Color.white); //设置背景颜色

point[0]=new Point(-1,-1); //初始化变量

point[1]=new Point(-1,-1);

addMouseListener(this); //增加鼠标事件

}

public void mouseReleased(MouseEvent e){ //鼠标释放事件

point[1]=new Point(e.getX(),e.getY()); //设置终点位置

repaint(); //重绘屏幕

}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void mousePressed(MouseEvent e){ //鼠标按下时事件

point[0]=new Point(e.getX(),e.getY()); //设置起始点位置

}

public void paint(Graphics g){

super.paint(g);

switch (shape){ //根据shape值绘制图形

case 0:

g.drawLine(point[0].x,point[0].y,point[1].x,point[1].y); //绘线

break;

case 1:

int width=point[1].x-point[0].x;

int height=point[1].y-point[0].y;

g.drawOval(point[0].x,point[0].y,width,height); //绘椭圆

break;

case 2:

width=point[1].x-point[0].x;

height=point[1].y-point[0].y;

g.drawRect(point[0].x,point[0].y,width,height); //绘矩形

break;

}

public void drawShape(int shape){

this.shape=shape;

}

PainterDemo.java 代码

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

class PainterPanel extends JPanel implements MouseListener

{

int shape = -1; //图案类型

Point point[] = new Point[2]; //记录鼠标拖动的起始点和终点

public PainterPanel ()

{

super ();

this.setBackground(Color.white);//设置背景颜色

point[0] = new Point (-1, -1);//初始化变量

point[1] = new Point (-1, -1);

addMouseListener (this);//增加鼠标事件

}

public void mouseReleased(MouseEvent e)//鼠标释放事件

{

point[1]=new Point(e.getX(),e.getY()); //设置终点位置

repaint(); //重绘屏幕

}

public void mouseEntered (MouseEvent e){}

public void mouseExited (MouseEvent e){}

public void mouseClicked (MouseEvent e){}

public void mousePressed (MouseEvent e) //鼠标按下时事件

{

point[0] = new Point(e.getX(), e.getY()); //设置起始点位置

}

public void paint(Graphics g)

{

super.paint(g);

switch (shape) //根据shape值绘制图形

{

case 0:

g.drawLine (point[0].x, point[0].y, point[1].x, point[1].y); //绘线

break;

case 1:

int width = point[1].x - point[0].x;

int height= point[1].y - point[0].y;

g.drawOval (point[0].x, point[0].y, width, height); //绘椭圆

break;

case 2:

width = point[1].x - point[0].x;

height = point[1].y - point[0].y;

g.drawRect(point[0].x, point[0].y, width, height); //绘矩形

break;

}

public void drawShape(int shape)

{

this.shape=shape;

}

public class PainterDemo extends JFrame

{

JButton[] button = new JButton[3]; //按钮组创建最初未选定的切换按钮java圆和矩形绘图代码，不设置文本或图像。

PainterPanel painter = new PainterPanel(); //绘图面板

public PainterDemo()

{

super("Java画图程序"); //调用父类构造函数

String[] buttonName = {"直线", "椭圆", "矩形"}; //按钮文字

DrawShapeListener buttonListener = new DrawShapeListener(); //按钮事件

JToolBar toolBar = new JToolBar(); //实例化工具栏

ButtonGroup buttonGroup = new ButtonGroup(); //实例化按钮组

for (int i = 0; i button.length; i ++)

{

button[i] = new JButton (buttonName[i]); //实例化按钮

button[i].addActionListener (buttonListener); //增加按钮事件处理

buttonGroup.add(button[i]); //增加按钮到按钮组

toolBar.add(button[i]); //增加按钮到工具栏

}

Container container=getContentPane(); //得到窗口容器

container.add (toolBar,BorderLayout.NORTH); //增加组件到容器上

container.add (painter,BorderLayout.CENTER);

setSize(300,200); //设置窗口尺寸

setVisible(true); //设置窗口为可视

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序

}

class DrawShapeListener implements ActionListener //按钮事件处理

{

public void actionPerformed(ActionEvent e)

{

for (int i = 0; i button.length; i ++)

{

if (e.getSource() == button[i]) //判断来自于哪个按钮

{

painter.drawShape(i); //绘制图形

}

public static void main(String[] args)

{

new PainterDemo();

}

Q2: JAVA编译简易画图板代码

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

import java.awt.geom.*;

import java.io.*;

class Point implements Serializable

{

int x,y;

Color col;

int tool;

int boarder;

Point(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;

}

class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener

{

int x = -1, y = -1;

int con = 1;//画笔大小

int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具标记

//toolFlag工具对应表：

//（0--画笔）；（1--橡皮）；（2--清除）；

//（3--直线）；（4--圆）；（5--矩形）；

Color c = new Color(0,0,0); //画笔颜色

BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//画笔粗细

Point cutflag = new Point(-1, -1, c, 6, con);//截断标志

Vector paintInfo = null;//点信息向量组

int n = 1;

FileInputStream picIn = null;

FileOutputStream picOut = null;

ObjectInputStream VIn = null;

ObjectOutputStream VOut = null;

// *工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除*/

Panel toolPanel;

Button eraser, drLine,drCircle,drRect;

Button clear ,pen;

Choice ColChoice,SizeChoice,EraserChoice;

Button colchooser;

Label 颜色,大小B,大小E;

//保存功能

Button openPic,savePic;

FileDialog openPicture,savePicture;

paintboard(String s)

{

super(s);

addMouseMotionListener(this);

addMouseListener(this);

paintInfo = new Vector();

/*各工具按钮及选择项*/

//颜色选择

ColChoice = new Choice();

ColChoice.add("black");

ColChoice.add("red");

ColChoice.add("blue");

ColChoice.add("green");

ColChoice.addItemListener(this);

//画笔大小选择

SizeChoice = new Choice();

SizeChoice.add("1");

SizeChoice.add("3");

SizeChoice.add("5");

SizeChoice.add("7");

SizeChoice.add("9");

SizeChoice.addItemListener(this);

//橡皮大小选择

EraserChoice = new Choice();

EraserChoice.add("5");

EraserChoice.add("9");

EraserChoice.add("13");

EraserChoice.add("17");

EraserChoice.addItemListener(this);

////////////////////////////////////////////////////

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");

colchooser = new Button("显示调色板");

//各组件事件监听

clear.addActionListener(this);

eraser.addActionListener(this);

pen.addActionListener(this);

drLine.addActionListener(this);

drCircle.addActionListener(this);

drRect.addActionListener(this);

openPic.addActionListener(this);

savePic.addActionListener(this);

colchooser.addActionListener(this);

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);

//面板添加组件

toolPanel.add(openPic);

toolPanel.add(savePic);

toolPanel.add(pen);

toolPanel.add(drLine);

toolPanel.add(drCircle);

toolPanel.add(drRect);

toolPanel.add(颜色); toolPanel.add(ColChoice);

toolPanel.add(大小B); toolPanel.add(SizeChoice);

toolPanel.add(colchooser);

toolPanel.add(eraser);

toolPanel.add(大小E); toolPanel.add(EraserChoice);

toolPanel.add(clear);

//工具面板到APPLET面板

add(toolPanel,BorderLayout.NORTH);

setBounds(60,60,900,600); setVisible(true);

validate();

//dialog for save and load

openPicture = new FileDialog(this,"打开图画",FileDialog.LOAD);

openPicture.setVisible(false);

savePicture = new FileDialog(this,"保存图画",FileDialog.SAVE);

savePicture.setVisible(false);

openPicture.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{ openPicture.setVisible(false); }

});

savePicture.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{ savePicture.setVisible(false); }

});

addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{ System.exit(0);}

});

}

public void paint(Graphics g)

{

Graphics2D g2d = (Graphics2D)g;

Point p1,p2;

n = paintInfo.size();

if(toolFlag==2)

g.clearRect(0,0,getSize().width,getSize().height);//清除

for(int i=0; in ;i++){

p1 = (Point)paintInfo.elementAt(i);

p2 = (Point)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)

{

case 0://画笔

Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);

g2d.draw(line1);

break;

case 1://橡皮

g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);

break;

case 3://画直线

Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);

g2d.draw(line2);

break;

case 4://画圆

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://画矩形

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://截断，跳过

i=i+1;

break;

default :

}//end switch

}//end if

}//end for

}

public void itemStateChanged(ItemEvent e)

{

if(e.getSource()==ColChoice)//预选颜色

{

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);}

}

else if(e.getSource()==SizeChoice)//画笔大小

{

String selected = SizeChoice.getSelectedItem();

if(selected=="1")

{

con = 1;