用java编写一个简单的画图程序。不用复杂

import java.awt.*;

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import java.awt.event.*;

import java.awt.geom.*;

import javax.swing.*;

//不规则图形的绘制

public class IrregularShapeDemo extends JFrame {

GeneralPath gPath= new GeneralPath(); //GeneralPath对象实例

Point aPoint;

//构造函数

public IrregularShapeDemo() {

super("不规则图形的绘制"); //调用父类构造函数

enableEvents(AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK); //允许事件

setSize(300, 200); //设置窗口尺寸

setVisible(true); //设置窗口可视

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

}

public void paint(Graphics g) { //重载窗口组件的paint()方法

Graphics2D g2D = (Graphics2D)g; //获取图形环境

g2D.draw(gPath); //绘制路径

}

public static void main(String[] args) {

new IrregularShapeDemo();

}

protected void processMouseEvent(MouseEvent e) { //鼠标事件处理

if(e.getID() == MouseEvent.MOUSE_PRESSED) {

aPoint = e.getPoint(); //得到当前鼠标点

gPath = new GeneralPath(); //重新实例化GeneralPath对象

gPath.moveTo(aPoint.x,aPoint.y); //设置路径点

}

}

protected void processMouseMotionEvent(MouseEvent e) { //鼠标运动事件处理

if(e.getID() == MouseEvent.MOUSE_DRAGGED) {

aPoint = e.getPoint(); //得到当前鼠标点

gPath.lineTo(aPoint.x, aPoint.y); //设置路径

gPath.moveTo(aPoint.x, aPoint.y);

repaint(); //重绘组件

}

}

}

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;

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);

}

}

else if(e.getSource()==EraserChoice)//橡皮大小

{

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; }

}

}

public void mouseDragged(MouseEvent e)

{

Point p1 ;

switch(toolFlag){

case 0://画笔

x = (int)e.getX();

y = (int)e.getY();

p1 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p1);

repaint();

break;

case 1://橡皮

x = (int)e.getX();

y = (int)e.getY();

p1 = new Point(x, y, null, toolFlag, Econ);

paintInfo.addElement(p1);

repaint();

break;

default :

}

}

public void mouseMoved(MouseEvent e) {}

public void update(Graphics g)

{

paint(g);

}

public void mousePressed(MouseEvent e)

{

Point p2;

switch(toolFlag){

case 3://直线

x = (int)e.getX();

y = (int)e.getY();

p2 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p2);

break;

case 4: //圆

x = (int)e.getX();

y = (int)e.getY();

p2 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p2);

break;

case 5: //矩形

x = (int)e.getX();

y = (int)e.getY();

p2 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p2);

break;

default :

}

}

public void mouseReleased(MouseEvent e)

{

Point p3;

switch(toolFlag){

case 0://画笔

paintInfo.addElement(cutflag);

break;

case 1: //eraser

paintInfo.addElement(cutflag);

break;

case 3://直线

x = (int)e.getX();

y = (int)e.getY();

p3 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p3);

paintInfo.addElement(cutflag);

repaint();

break;

case 4: //圆

x = (int)e.getX();

y = (int)e.getY();

p3 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p3);

paintInfo.addElement(cutflag);

repaint();

break;

case 5: //矩形

x = (int)e.getX();

y = (int)e.getY();

p3 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p3);

paintInfo.addElement(cutflag);

repaint();

break;

default:

}

}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==pen)//画笔

{toolFlag = 0;}

if(e.getSource()==eraser)//橡皮

{toolFlag = 1;}

if(e.getSource()==clear)//清除

{

toolFlag = 2;

paintInfo.removeAllElements();

repaint();

}

if(e.getSource()==drLine)//画线

{toolFlag = 3;}

if(e.getSource()==drCircle)//画圆

{toolFlag = 4;}

if(e.getSource()==drRect)//画矩形

{toolFlag = 5;}

if(e.getSource()==colchooser)//调色板

{

Color newColor = JColorChooser.showDialog(this,"调色板",c);

c = newColor;

}

if(e.getSource()==openPic)//打开图画

{

openPicture.setVisible(true);

if(openPicture.getFile()!=null)

{

int tempflag;

tempflag = toolFlag;

toolFlag = 2 ;

repaint();

try{

paintInfo.removeAllElements();

File filein = new File(openPicture.getDirectory(),openPicture.getFile());

picIn = new FileInputStream(filein);

VIn = new ObjectInputStream(picIn);

paintInfo = (Vector)VIn.readObject();

VIn.close();

repaint();

toolFlag = tempflag;

}

catch(ClassNotFoundException IOe2)

{

repaint();

toolFlag = tempflag;

System.out.println("can not read object");

}

catch(IOException IOe)

{

repaint();

toolFlag = tempflag;

System.out.println("can not read file");

}

}

}

if(e.getSource()==savePic)//保存图画

{

savePicture.setVisible(true);

try{

File fileout = new File(savePicture.getDirectory(),savePicture.getFile());

picOut = new FileOutputStream(fileout);

VOut = new ObjectOutputStream(picOut);

VOut.writeObject(paintInfo);

VOut.close();

}

catch(IOException IOe)

{

System.out.println("can not write object");

}

}

}

}//end paintboard

public class pb

{

public static void main(String args[])

{ new paintboard("画图程序"); }

}

求java版画图程序的源代码

找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。

package net.miqiang.gui;

import java.awt.BasicStroke;

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Color;

import java.awt.Cursor;

import java.awt.Dimension;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.Panel;

import java.awt.RenderingHints;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.awt.image.BufferedImage;

/**

* 简单画图板程序

* 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。

*

* @author 米强

*

*/

public class TestMain extends Frame {

// 画板

private Palette palette = null;

// 显示当前颜色的面板

private Panel nonceColor = null;

// 画笔粗细

private Label drawWidth = null;

// 画笔端点的装饰

private Label drawCap = null;

// 选取颜色按钮的监听事件类

private ButtonColorAction buttonColorAction = null;

// 鼠标进入按钮后光标样式的监听事件类

private ButtonCursor buttonCursor = null;

// 画笔样式的监听事件

private ButtonStrokeAction buttonStrokeAction = null;

/**

* 构造方法

*

*/

public TestMain() {

// 设置标题栏文字

super("简易画图板");

// 构造一个画图板

palette = new Palette();

Panel pane = new Panel(new GridLayout(2, 1));

// 画笔颜色选择器

Panel paneColor = new Panel(new GridLayout(1, 13));

// 12 个颜色选择按钮

Button [] buttonColor = new Button[12];

Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};

// 显示当前颜色的面板

nonceColor = new Panel();

nonceColor.setBackground(Color.black);

paneColor.add(nonceColor);

buttonColorAction = new ButtonColorAction();

buttonCursor = new ButtonCursor();

for(int i = 0; i buttonColor.length; i++){

buttonColor[i] = new Button();

buttonColor[i].setBackground(color[i]);

buttonColor[i].addActionListener(buttonColorAction);

buttonColor[i].addMouseListener(buttonCursor);

paneColor.add(buttonColor[i]);

}

pane.add(paneColor);

// 画笔颜色选择器

Panel paneStroke = new Panel(new GridLayout(1, 13));

// 控制画笔样式

buttonStrokeAction = new ButtonStrokeAction();

Button [] buttonStroke = new Button[11];

buttonStroke[0] = new Button("1");

buttonStroke[1] = new Button("3");

buttonStroke[2] = new Button("5");

buttonStroke[3] = new Button("7");

buttonStroke[4] = new Button("9");

buttonStroke[5] = new Button("11");

buttonStroke[6] = new Button("13");

buttonStroke[7] = new Button("15");

buttonStroke[8] = new Button("17");

buttonStroke[9] = new Button("■");

buttonStroke[10] = new Button("●");

drawWidth = new Label("3", Label.CENTER);

drawCap = new Label("●", Label.CENTER);

drawWidth.setBackground(Color.lightGray);

drawCap.setBackground(Color.lightGray);

paneStroke.add(drawWidth);

for(int i = 0; i buttonStroke.length; i++){

paneStroke.add(buttonStroke[i]);

buttonStroke[i].addMouseListener(buttonCursor);

buttonStroke[i].addActionListener(buttonStrokeAction);

if(i = 8){

buttonStroke[i].setName("width");

}else{

buttonStroke[i].setName("cap");

}

if(i == 8){

paneStroke.add(drawCap);

}

}

pane.add(paneStroke);

// 将画笔颜色选择器添加到窗体中

this.add(pane, BorderLayout.NORTH);

// 将画图板添加到窗体中

this.add(palette);

// 添加窗口监听，点击关闭按钮时退出程序

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

// 设置窗体 ICON 图标

this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));

// 设置窗口的大小

this.setSize(new Dimension(400, 430));

// 设置窗口位置，处于屏幕正中央

this.setLocationRelativeTo(null);

// 显示窗口

this.setVisible(true);

}

/**

* 程序入口

*

* @param args

* 字符串数组参数

*/

public static void main(String[] args) {

new TestMain();

}

/**

* 选取颜色按钮的监听事件类

* @author 米强

*

*/

class ButtonColorAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

Color color_temp = ((Button)e.getSource()).getBackground();

nonceColor.setBackground(color_temp);

palette.setColor(color_temp);

}

}

/**

* 鼠标进入按钮变换光标样式监听事件类

* @author 米强

*

*/

class ButtonCursor extends MouseAdapter {

public void mouseEntered(MouseEvent e) {

((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));

}

public void mouseExited(MouseEvent e) {

((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

}

}

/**

* 设置画笔的监听事件类

* @author 米强

*

*/

class ButtonStrokeAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

Button button_temp = (Button) e.getSource();

String name = button_temp.getName();

if(name.equalsIgnoreCase("width")){

drawWidth.setText(button_temp.getLabel());

palette.setStroke(Float.parseFloat(button_temp.getLabel()));

}else if(name.equalsIgnoreCase("cap")){

drawCap.setText(button_temp.getLabel());

if(button_temp.getLabel().equals("■")){

palette.setStroke(BasicStroke.CAP_SQUARE);

}else if(button_temp.getLabel().equals("●")){

palette.setStroke(BasicStroke.CAP_ROUND);

}

}

}

}

}

/**

* 画板类

*

* @author 米强

*

*/

class Palette extends Panel implements MouseListener, MouseMotionListener {

// 鼠标 X 坐标的位置

private int mouseX = 0;

// 上一次 X 坐标位置

private int oldMouseX = 0;

// 鼠标 Y 坐标的位置

private int mouseY = 0;

// 上一次 Y 坐标位置

private int oldMouseY = 0;

// 画图颜色

private Color color = null;

// 画笔样式

private BasicStroke stroke = null;

// 缓存图形

private BufferedImage image = null;

/**

* 构造一个画板类

*

*/

public Palette() {

this.addMouseListener(this);

this.addMouseMotionListener(this);

// 默认黑色画笔

color = new Color(0, 0, 0);

// 设置默认画笔样式

stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);

// 建立 1280 * 1024 的 RGB 缓存图象

image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);

// 设置颜色

image.getGraphics().setColor(Color.white);

// 画背景

image.getGraphics().fillRect(0, 0, 1280, 1024);

}

/**

* 重写 paint 绘图方法

*/

public void paint(Graphics g) {

super.paint(g);

// 转换为 Graphics2D

Graphics2D g2d = (Graphics2D) g;

// 获取缓存图形 Graphics2D

Graphics2D bg = image.createGraphics();

// 图形抗锯齿

bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

// 设置绘图颜色

bg.setColor(color);

// 设置画笔样式

bg.setStroke(stroke);

// 画线，从上一个点到新的点

bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);

// 将缓存中的图形画到画板上

g2d.drawImage(image, 0, 0, this);

}

/**

* 重写 update 方法

*/

public void update(Graphics g) {

this.paint(g);

}

/**

* @return stroke

*/

public BasicStroke getStroke() {

return stroke;

}

/**

* @param stroke 要设置的 stroke

*/

public void setStroke(BasicStroke stroke) {

this.stroke = stroke;

}

/**

* 设置画笔粗细

* @param width

*/

public void setStroke(float width) {

this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());

}

/**

* 设置画笔端点的装饰

* @param cap 参考 java.awt.BasicStroke 类静态字段

*/

public void setStroke(int cap) {

this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());

}

/**

* @return color

*/

public Color getColor() {

return color;

}

/**

* @param color 要设置的 color

*/

public void setColor(Color color) {

this.color = color;

}

public void mouseClicked(MouseEvent mouseEvent) {

}

/**

* 鼠标按下

*/

public void mousePressed(MouseEvent mouseEvent) {

this.oldMouseX = this.mouseX = mouseEvent.getX();

this.oldMouseY = this.mouseY = mouseEvent.getY();

repaint();

}

public void mouseReleased(MouseEvent mouseEvent) {

}

/**

* 鼠标进入棋盘

*/

public void mouseEntered(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));

}

/**

* 鼠标退出棋盘

*/

public void mouseExited(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

}

/**

* 鼠标拖动

*/

public void mouseDragged(MouseEvent mouseEvent) {

this.oldMouseX = this.mouseX;

this.oldMouseY = this.mouseY;

this.mouseX = mouseEvent.getX();

this.mouseY = mouseEvent.getY();

repaint();

}

public void mouseMoved(MouseEvent mouseEvent) {

}

}

用Java实现画图板功能的程序，请问如何编写一个绘制三角形的程序段

class Triangle extends drawings//空心三角形类

{

void draw(Graphics2D g2d)

{g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new BasicStroke(stroke,

BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL));

g2d.drawLine((int)((x1+x2)/2),Math.min(y1,y2),Math.max(x1,x2),Math.max(y1,y2));

g2d.drawLine(Math.max(x1,x2),Math.max(y1,y2),Math.min(x1,x2),Math.max(y1,y2));

g2d.drawLine(Math.min(x1,x2),Math.max(y1,y2),(int)((x1+x2)/2),Math.min(y1,y2));

}

}

以上是通过绘制三条直线作为三角形的三条边来绘制三角形.

class fillTriangle extends drawings//实心三角形

{

void draw(Graphics2D g2d)

{g2d.setPaint(new Color(R,G,B));

g2d.setStroke(new BasicStroke(stroke));

int mx=(int)((x1+x2)/2);

int[] x={mx,Math.max(x1,x2),Math.min(x1,x2)};

int[] y={Math.min(y1,y2),Math.max(y1,y2),Math.max(y1,y2)};

g2d.fillPolygon(x,y,3);

}

}

以上是用填充多边形的方式填充一个三角形,如果把最后的:g2d.fillPolygon(x,y,3)改为g2d.drawPolygon(x,y,3); 则是以绘制多边形的方式绘制空心三角形.

这里说明一下:因为(x1,y1,x2,y2)只能确定一个矩形区域,即鼠标拉动的起点和终点确定的矩形区域所以可以有多种方式确定三角形的三个顶点,我这个用的三个顶点是:

点1( (x1+x2)/2, min(y) ) 点2( max(x),max(y) ) 点3( min(x),max(y) )

你的补充内容太多了,没心情看啊,太累了

java画图的程序

import java.awt.*;

import javax.swing.*;

public class TankWar extends JFrame {

public TankWar (String title) {

super(title);

this.setSize(600,500);

this.setLocationRelativeTo(null); //设置窗口的位置屏幕中间

this.setResizable(false); //设置为不可改变大小

this.setDefaultCloseOperation(EXIT_ON_CLOSE); //设置关闭事件

MyJPanel myJPanel = new MyJPanel(); //创建一个MyJPanel实例对象myJPanel

myJPanel.setBackground(Color.blue);//设置myJPanel的背景颜色

this.add(myJPanel);

this.setVisible(true);

}

/*内部继承JPanel类*/

class MyJPanel extends JPanel {

protected void paintComponent(Graphics g) {

g.setClip(30,30,300,300);

Color c = g.getColor();

g.setColor(Color.red);

g.fillOval(200, 100, 300, 300);

g.setColor(c);

}

}

public static void main(String args[]){

new TankWar ("坦克大战");

}

}

GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！

只有矩形有圆形能移动，其它实现起来麻烦点，办法有的只是代码太多。

画圆弧改成了画曲线，圆弧稍麻烦，当然方法是很简单的，你可以自己思考一下。

双击13个颜色中的任意一个都会弹出颜色选择器。

有保存与打开功能。扩展名请用 .jdr

基本满足条件，细节可能不是很好，另，代码比较乱，怕不好看懂咯，呼呼。

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.ArrayList;

import javax.swing.*;

import javax.swing.filechooser.FileNameExtensionFilter;

public class JDraw {

public static void main(String[] args) {

JFrame f=new JFrame();

f.setDefaultCloseOperation(3);

f.setSize(880,600);

f.setLocationRelativeTo(null);

f.getContentPane().add(M.c);

f.getContentPane().add(M.m,"South");

f.setVisible(true);

}

}

class CVS extends Component implements ComponentListener,MouseListener,MouseMotionListener{

public void componentHidden(ComponentEvent e) {}

public void componentMoved(ComponentEvent e) {}

public void componentResized(ComponentEvent e) {resized();}

public void componentShown(ComponentEvent e) {}

private void resized() {

int w=this.getWidth();

int h=this.getHeight();

tbuff=new BufferedImage(w,h,3);

makeBuff(w,h);

}

private void makeBuff(int w,int h) {

Graphics g = tbuff.getGraphics();

g.drawImage(buff,0,0,null);

g.dispose();

buff=new BufferedImage(w,h,3);

g=buff.getGraphics();

g.drawImage(tbuff,0,0,null);

g.dispose();

}

BufferedImage buff,tbuff;

CVS(){

this.addComponentListener(this);

this.addMouseListener(this);

this.addMouseMotionListener(this);

buff=new BufferedImage(1,1,3);

}

public void paint(Graphics gr){

Graphics2D g = buff.createGraphics();

g.setBackground(new Color(0xff000000,true));

g.clearRect(0,0,getWidth(),getHeight());

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

M.sa.drawAll(g);

if(M.ts!=null)

M.ts.draw(g);

g.dispose();

gr.drawImage(buff,0,0,this);

gr.dispose();

}

public void mouseClicked(MouseEvent e) {}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {

M.mp(e.getPoint());

}

public void mouseReleased(MouseEvent e) {

M.mr(e.getPoint());

}

public void mouseDragged(MouseEvent e) {

M.md(e.getPoint());

}

public void mouseMoved(MouseEvent e) {}

}

class Menu extends JComponent implements MouseListener,ActionListener{

JComboBox sbox,method;

CLabel[] cl;

JCheckBox fillC,drawB;

JRadioButton fc,bc;

ButtonGroup bg;

JButton clear,up,down,save,load;

Menu(){

this.setLayout(new FlowLayout());

method=new JComboBox(new Object[]{"draw","move","erase",});

add(method);

sbox=new JComboBox(new Object[]{"Pt","Ln","Rect","Cir","Arc",});

add(sbox);

cl=new CLabel[13];

for(int i=0; icl.length; i++){

cl[i]=new CLabel();

cl[i].addMouseListener(this);

add(cl[i]);

}

fc=new JRadioButton("fc",true);

bc=new JRadioButton("bc");

bg=new ButtonGroup();

bg.add(fc);bg.add(bc);

add(fc);add(bc);

fc.setOpaque(true);

bc.setOpaque(true);

fc.setBackground(Color.white);

bc.setBackground(Color.blue);

fillC=new JCheckBox("Fill",true);

drawB=new JCheckBox("Draw",true);

fillC.addActionListener(this);

drawB.addActionListener(this);

add(fillC);add(drawB);

clear=new JButton("clear");

clear.addActionListener(this);

add(clear);

up=new JButton("zUp");

up.addActionListener(this);

add(up);

down=new JButton("zDown");

down.addActionListener(this);

add(down);

save=new JButton("Save");

save.addActionListener(this);

add(save);

load=new JButton("Load");

load.addActionListener(this);

add(load);

}

public void mouseClicked(MouseEvent e) {

JLabel l=(JLabel)e.getSource();

if(e.getClickCount()==2){

Color sc=JColorChooser.showDialog(null, "Color chooser", l.getBackground());

l.setBackground(sc);

mousePressed(e);

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {

Color c=((JLabel)e.getSource()).getBackground();

if(fc.isSelected())

fc.setBackground(c);

else if(bc.isSelected())

bc.setBackground(c);

M.cp();

}

public void mouseReleased(MouseEvent e) {}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==clear)M.clear();

else if(e.getSource()==up)M.up();

else if(e.getSource()==down)M.down();

else if(e.getSource()==save)M.save();

else if(e.getSource()==load)M.load();

else if(e.getSource()==fillC||e.getSource()==drawB)M.cp();

}

}

class CLabel extends JLabel{

static Color[] cs={Color.red,Color.orange,Color.yellow,Color.green,Color.cyan,

Color.blue,Color.magenta,Color.magenta.brighter(),

Color.white,Color.black,Color.gray,Color.LIGHT_GRAY,Color.DARK_GRAY,};

static int i;

CLabel(){

this.setOpaque(true);

this.setBackground(cs[i++]);

this.setBorder(BorderFactory.createLineBorder(Color.black));

this.setPreferredSize(new Dimension(10,20));

}

}

class M{

static JFileChooser jfc=new JFileChooser();

static Menu m=new Menu();

static CVS c=new CVS();

static SA sa=new SA();

static S ts=null,selected=null;

static Color fc,bc;

static void clear(){

sa.ss.clear();

c.repaint();

}

public static void cp() {

System.out.println(selected);

if(selected!=null){

selected.fillColor=m.fc.getBackground();

selected.borderColor=m.bc.getBackground();

selected.fc=m.fillC.isSelected();

selected.db=m.drawB.isSelected();

c.repaint();

}

}

public static void up() {

if(selected!=null){

sa.upZ(selected);

c.repaint();

}

}

public static void down(){

if(selected!=null){

sa.downZ(selected);

c.repaint();

}

}

static{

jfc.setFileFilter(new FileNameExtensionFilter("JDraw file (*.jdraw,*.jdr)","jdr","jdraw"));

}

static void save(){

int x=jfc.showSaveDialog(c);

if(x==JFileChooser.APPROVE_OPTION){

File f = jfc.getSelectedFile();

try{

ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(f));

oos.writeObject(sa);

oos.flush();

oos.close();

}catch(Exception e){}

}

}

static void load(){

int x=jfc.showOpenDialog(c);

if(x==JFileChooser.APPROVE_OPTION){

File f = jfc.getSelectedFile();

try{

ObjectInputStream oos=new ObjectInputStream(new FileInputStream(f));

Object r=oos.readObject();

if(r!=null){

sa=(SA)r;

c.repaint();

}

oos.close();

}catch(Exception e){e.printStackTrace();}

}

}

static int mx,my,tx,ty,ox,oy;

static int pc=0,pmax;

static int sm;

static boolean ne=true;

static int mid;

static void mp(Point p){

mid=m.method.getSelectedIndex();

if(mid==0){

if(ne){

mx=p.x;my=p.y;

pc=0;

sm=m.sbox.getSelectedIndex();

pmax=sm==4?2:1;

ne=false;

}

++pc;

}

else if(mid==1){

checkSel(p);

mx=p.x;my=p.y;

}

else if(mid==2){

checkSel(p);

if(selected!=null){

sa.ss.remove(selected);

c.repaint();

}

}

}

private static void checkSel(Point p) {

selected=null;

for(int i=sa.ss.size();i0; i--)

if(sa.ss.get(i-1).shape.contains(p)){

selected=sa.ss.get(i-1);break;

}

sa.select(selected);

c.repaint();

}

static void mt(){

Shape s=null;

int cx,cy,cw,ch;

switch(sm){

case 0:

case 2:

cx=Math.min(mx,tx);

cy=Math.min(my,ty);

cw=Math.abs(mx-tx);

ch=Math.abs(my-ty);

if(sm==0)

s=new Ellipse2D.Double(cx,cy,cw,ch);

else

s=new Rectangle(cx,cy,cw,ch);

break;

case 1:

s=new Line2D.Float(mx,my,tx,ty);

break;

case 3:

cw=Math.abs(mx-tx);

ch=Math.abs(my-ty);

int cd=(int)Math.sqrt(Math.pow(mx-tx,2)+Math.pow(my-ty,2))*2;

cx=mx-cd/2;

cy=my-cd/2;

s=new Ellipse2D.Double(cx,cy,cd,cd);

break;

case 4:

Path2D p=new Path2D.Double();

p.moveTo(mx,my);

if(pc==1){

p.lineTo(tx, ty);

}

else{

p.quadTo(ox,oy,tx,ty);

}

s=p;

break;

}

ts=new S(s,m.fc.getBackground(),m.bc.getBackground(),m.fillC.isSelected(),m.drawB.isSelected(),null);

c.repaint();

}

static void md(Point p){

if(mid==0){

if(!sa.ss.isEmpty()){

sa.ss.get(sa.ss.size()-1).sel=false;

}

if(pc1){

ox=p.x;oy=p.y;

}

else{

tx=p.x;ty=p.y;

}

mt();

}

else if(mid==1){

if(selected!=null){

moveTo(selected,p);

c.repaint();

}

}

else if(mid==2){

checkSel(p);

if(selected!=null){

sa.ss.remove(selected);

c.repaint();

}

}

}

static void moveTo(S s, Point p) {

if(s.shape instanceof Rectangle){

Rectangle r=(Rectangle)s.shape;

r.setLocation(r.x+p.x-mx,r.y+p.y-my);

mx=p.x;my=p.y;

}

else if(s.shape instanceof Ellipse2D){

Ellipse2D e=(Ellipse2D)s.shape;

e.setFrame(e.getX()+p.x-mx,e.getY()+p.y-my,e.getWidth(),e.getHeight());

mx=p.x;my=p.y;

}

}

static void mr(Point p) {

if(pc==pmax){

pc=0;

ne=true;

sa.add(ts);

selected=ts;

ts=null;

}

}

}

class S implements Serializable{

boolean fc,db,sel=true;

Shape shape;

Color fillColor,borderColor;

Stroke stroke;

static Stroke bstroke=new MyBasicStroke();

static Stroke selectStroke=new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER,1,new float[]{5,2},1);

S(Shape s,Color c,Color b,boolean f,boolean d,Stroke k){

this.shape=s;this.fillColor=c;this.borderColor=b;this.fc=f;this.db=d;this.stroke=k==null?bstroke:k;

}

void draw(Graphics2D g){

if(fc){

g.setColor(fillColor);

g.fill(shape);

}

if(db){

g.setColor(borderColor);

g.setStroke(stroke);

g.draw(shape);

}

if(sel){

g.setColor(Color.green);

g.setStroke(selectStroke);

g.draw(shape.getBounds());

}

}

}

class MyBasicStroke extends BasicStroke implements Serializable{}

class SA implements Serializable{

ArrayListS ss=new ArrayListS();

void add(S s){

if(s!=null){

for(S sx:ss)

sx.sel=false;

ss.add(s);

}

}

S remove(int i){

return ss.remove(i);

}

void remove(S s){

ss.remove(s);

}

void upZ(S s){

indexZ(s,1);

}

void downZ(S s){

indexZ(s,-1);

}

void indexZ(S s, int i) {

int si=ss.indexOf(s);

if(si+i0||si+iss.size()-1)return;

swap(s,ss.get(si+i));

}

void swap(S a,S b){

int ai=ss.indexOf(a);

int bi=ss.indexOf(b);

ss.set(ai,b);

ss.set(bi,a);

}

void select(S s){

for(S x:ss)

x.sel=false;

if(s!=null)

s.sel=true;

}

void drawAll(Graphics2D g){

for(S s:ss)

s.draw(g);

}

}

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