正文
java画简单图形的代码 java绘图程序代码
提示：扫一扫查出行【扫一扫了解最新限行尾号】
复制提示
求一个java程序：绘图程序包括画圆，椭圆，线，矩形，自定义。并且可以调图形颜色！
public enum ShapeTypes {
LINE, CIRCLE, RECTANGLE
}
public interface Shape {
void paint(Graphics g);
}
public class Rectangle implements Shape {
// 矩形左上角的坐标
private int x, y;
// 矩形的宽度和高度
private int width, height;
private Color rectangleColor;
public Rectangle() {
super();
}
public Rectangle(int x, int y, int width, int height, Color rectangleColor) {
super();
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.rectangleColor = rectangleColor;
}
@Override
public void paint(Graphics g) {
g.setColor(rectangleColor);
g.drawRect(x, y, width, height);
}
}
public class Line implements Shape {
// 直线的起始位置
private int x1, y1;
// 直线的终止位置
private int x2, y2;
private Color lineColor;
public Line(int x1, int y1, int x2, int y2, Color lineColor) {
super();
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.lineColor = lineColor;
}
public Line() {
super();
}
@Override
public void paint(Graphics g) {
g.setColor(lineColor);
g.drawLine(x1, y1, x2, y2);
}
}
public class Circle implements Shape {
// 圆的颜色
private Color circleColor;
// 圆心的坐标
private int x, y;
// 圆的半径
private int radius;
public Circle() {
super();
}
public Circle(int x, int y, int radius, Color circleColor) {
super();
this.circleColor = circleColor;
this.x = x;
this.y = y;
this.radius = radius;
}
@Override
public void paint(Graphics g) {
g.setColor(circleColor);
// 画弧, 当弧的宽度和高度一致且从0~360度时就是原形了
g.drawArc(x, y, radius, radius, 0, 360);
}
}
public class SketchpadPanel extends Canvas implements MouseListener, MouseMotionListener {
private static final long serialVersionUID = -5229161042153132522L;
// 鼠标点击起始坐标和当前坐标
private int beginX = 0, beginY = 0, currentX = 0, currentY = 0;
// 判断鼠标是否被按下
private boolean isMousePressing = false;
// 保存当前的图形, 在撤销和恢复时使用
private final StackShape currentShapes = new StackShape();
// 保存已经删除过的图形
private final StackShape deletedShapes = new StackShape();
private ShapeTypes type;
private Color color;
public SketchpadPanel() {
addMouseListener(this);
addMouseMotionListener(this);
}
/**
* 撤销方法
*/
public void undo() {
if (currentShapes.size() 0) {
// 从所有保存过的图形中取出最后一个, 放入到已删除的图形中去
Shape shape = currentShapes.pop();
deletedShapes.push(shape);
repaint();
}
}
/**
* 恢复撤销方法
*/
public void redo() {
if (deletedShapes.size() 0) {
// 从所有删除的图形中取出最后一个, 放入保存的图形中
Shape shape = deletedShapes.pop();
currentShapes.push(shape);
repaint();
}
}
/**
* 设置命令
*
* @param type
*/
public void setShapeType(ShapeTypes type) {
this.type = type;
}
/**
* 设置颜色
*
* @param color
*/
public void setColor(Color color) {
this.color = color;
}
public void updete(Graphics g) {
paint(g);
}
/**
* 绘制画板
*/
@Override
public void paint(Graphics g) {
// 绘制画板
Dimension size = getSize();
int width = size.width;
int height = size.height;
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 绘制所有图形
Shape shape = null;
EnumerationShape e = currentShapes.elements();
while (e.hasMoreElements()) {
shape = e.nextElement();
shape.paint(g);
}
// 如果当前鼠标没有释放
if (isMousePressing) {
g.setColor(color);
switch (type) {
// 绘制直线
case LINE:
g.drawLine(beginX, beginY, currentX, currentY);
break;
// 绘制矩形
case RECTANGLE:
if (currentX beginX) {
if (currentY beginY) {
// 如果当前位置在起始位置的左上方, 则以鼠标当前位置为矩形的左上角位置
g.drawRect(currentX, currentY, beginX - currentX, beginY - currentY);
} else {
// 如果当前位置在起始位置的左下方, 则以鼠标当前位置的横坐标和起始位置的纵坐标作为矩形的左上角位置
g.drawRect(currentX, beginY, beginX - currentX, currentY - beginY);
}
} else {
if (currentY beginY) {
// 如果当前位置在起始位置的右上方, 则以鼠标起始位置的很坐标和当前位置的纵坐标作为矩形的左上角位置
g.drawRect(beginX, currentY, currentX - beginX, beginY - currentY);
} else {
// 如果当前位置在起始位置的右下方, 则已起始位置作为矩形的左上叫位置
g.drawRect(beginX, beginY, currentX - beginX, currentY - beginY);
}
}
break;
// 绘制圆形
case CIRCLE:
// 半径为a*a + b*b的平方根
int radius = (int) Math
.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));
g.drawArc(beginX - radius / 2, beginY - radius / 2, radius, radius, 0, 360);
break;
}
}
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
/**
* 当鼠标按下的时候获得起始坐标
*/
@Override
public void mousePressed(MouseEvent e) {
beginX = e.getX();
beginY = e.getY();
isMousePressing = true;
}
/**
* 当鼠标释放时获得当前坐标
*/
@Override
public void mouseReleased(MouseEvent e) {
currentX = e.getX();
currentY = e.getY();
isMousePressing = false;
// 当释放鼠标时, 将绘制的图形保存到shapes中
switch (type) {
// 绘制直线
case LINE:
Line line = new Line(beginX, beginY, currentX, currentY, color);
currentShapes.push(line);
break;
// 绘制圆形
case CIRCLE:
// 半径为a*a + b*b的平方根
int radius = (int) Math
.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));
Circle circle = new Circle(beginX - radius / 2, beginY - radius / 2, radius, color);
currentShapes.push(circle);
break;
// 绘制矩形
case RECTANGLE:
Rectangle rectangle = null;
if (currentX beginX) {
if (currentY beginY) {
rectangle = new Rectangle(currentX, currentY, beginX - currentX, beginY - currentY, color);
} else {
rectangle = new Rectangle(currentX, beginY, beginX - currentX, currentY - beginY, color);
}
} else {
if (currentY beginY) {
rectangle = new Rectangle(beginX, currentY, currentX - beginX, beginY - currentY, color);
} else {
rectangle = new Rectangle(beginX, beginY, currentX - beginX, currentY - beginY, color);
}
}
currentShapes.push(rectangle);
break;
}
repaint();
}
@Override
public void mouseDragged(MouseEvent e) {
currentX = e.getX();
currentY = e.getY();
this.repaint();
}
@Override
public void mouseMoved(MouseEvent e) {
}
}
public class SketchpadFrame extends JFrame {
private static final long serialVersionUID = -7080053971741609904L;
private final JPanel commandPanel = new JPanel(); // 存放命令的面板
private final JPanel colorPanel = new JPanel(); // 存放颜色的面板
private final JPanel mainPanel = new JPanel(); // 主面板
private final JButton redButton = new JButton("红色");
private final JButton blueButton = new JButton("蓝色");
private final JButton greenButton = new JButton("绿色");
private final JButton lineButton = new JButton("直线");
private final JButton circleButton = new JButton("圆");
private final JButton rectangleButton = new JButton("矩形");
private final JButton undoButton = new JButton("撤销");
private final JButton redoButton = new JButton("恢复撤销");
private final JButton exitButton = new JButton("退出");
SketchpadPanel sketchPanel = new SketchpadPanel();
private void initFrame() {
commandPanel.setLayout(new FlowLayout());
commandPanel.add(lineButton);
commandPanel.add(circleButton);
commandPanel.add(rectangleButton);
commandPanel.add(undoButton);
commandPanel.add(redoButton);
commandPanel.add(exitButton);
colorPanel.setLayout(new FlowLayout());
colorPanel.add(redButton);
colorPanel.add(blueButton);
colorPanel.add(greenButton);
mainPanel.setLayout(new BorderLayout());
mainPanel.add(commandPanel, BorderLayout.NORTH);
mainPanel.add(colorPanel, BorderLayout.CENTER);
getContentPane().add("South", mainPanel);
getContentPane().add("Center", sketchPanel);
// 初始化设置:颜色和命令
lineButton.setForeground(Color.RED);
sketchPanel.setColor(Color.RED);
redButton.setForeground(Color.RED);
sketchPanel.setShapeType(ShapeTypes.LINE);
}
private void initListener() {
redButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
redAction(e);
}
});
blueButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
blueAction(e);
}
});
greenButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
greenAction(e);
}
});
undoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
undoAction(e);
}
});
redoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
redoAction(e);
}
});
exitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
exitAction(e);
}
});
lineButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
lineAction(e);
}
});
circleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
circleAction(e);
}
});
rectangleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
rectangleAction(e);
}
});
}
public SketchpadFrame() {
initFrame();
initListener();
this.setSize(500, 600);
setLocationByPlatform(true);
setResizable(true);
}
/* ********************处理事件********************* */
private void undoAction(ActionEvent e) {
sketchPanel.undo();
}
private void redoAction(ActionEvent e) {
sketchPanel.redo();
}
private void exitAction(ActionEvent e) {
System.exit(0);
}
private void lineAction(ActionEvent e) {
// 选中按钮为红色, 其余为黑色
lineButton.setForeground(Color.RED);
circleButton.setForeground(Color.BLACK);
rectangleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.LINE);
}
private void circleAction(ActionEvent e) {
circleButton.setForeground(Color.RED);
lineButton.setForeground(Color.BLACK);
rectangleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.CIRCLE);
}
private void rectangleAction(ActionEvent e) {
rectangleButton.setForeground(Color.RED);
lineButton.setForeground(Color.BLACK);
circleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.RECTANGLE);
}
private void redAction(ActionEvent e) {
redButton.setForeground(Color.RED);
blueButton.setForeground(Color.BLACK);
greenButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.RED);
}
private void blueAction(ActionEvent e) {
blueButton.setForeground(Color.RED);
redButton.setForeground(Color.BLACK);
greenButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.BLUE);
}
private void greenAction(ActionEvent e) {
greenButton.setForeground(Color.RED);
redButton.setForeground(Color.BLACK);
blueButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.GREEN);
}
}
/**
*
* @author 不落的太阳(Sean Yang)
* @version 1.0
* @since JDK 1.8
*
*/
public class SketchpadMain {
/**
* 测试方法
*
* @param args命令行参数
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new SketchpadFrame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}
}
相关问答
Q1: java中做一个按钮，点击按钮后画一个矩形的代码怎么写？
兄弟帮你写了一个：
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Random;
public class Print {
public static void main(String[] args) {
new Te();
}
}
class Te extends Frame implements ActionListener {
Color cc = Color.red;
int x = -20, y = -50;
Random r = new Random();
public Te() {
this.setLayout(null);
Button b = new Button("画圆");
this.add(b);
b.setBounds(30,30,50,50);
b.addActionListener(this);
this.addWindowListener(new WindowAdapter () {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setBounds(200,200,500,400);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
this.cc = Color.red;
this.x = r.nextInt(400);
do {
int x1 = r.nextInt(300);
this.y = x1;
} while (this.y 50);
this.repaint();
}
@Override
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(cc);
g.drawRect(x,y,50,50);
g.setColor(c);
}
}
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;
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"); }
}
Q3: 用java 在窗体中画一个简单图形。
帮你改了一下。
你要画在panel上，然后frame.add(panel)就能显示。
是不是和applet搞混了，applet复写一些方法就能显示，但现在你编的是java gui
import java.awt.*;
import java.awt.Event.*;
import javax.swing.*; //import javax.swing.Timer;
import java.awt.BasicStroke;
//import java.util.Date;
//import java.text.*;
//import java.util.*;
public class TestGui {
public void paint(Graphics g) {
Graphics2D a2d = (Graphics2D) g;
int x = 120, y = 90, width = 150, height = 150;
a2d.setColor(Color.red);
a2d.setStroke(new BasicStroke(3.0f)); // 设置线条宽度，3.0即线的宽度
a2d.drawOval(x, y, width, height);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
// frame.add(new paint(),BorderLayout.CENTER);
frame.setSize(500, 500);
frame.setLocation(200, 200);
frame.setVisible(true);
Panel p = new Panel();
frame.add(p);
// frame.paint(null);
// TODO code application logic here
}
}
class Panel extends JPanel {
// 重新覆盖paint方法
public void paint(Graphics g) {
super.paint(g);
Graphics2D a2d = (Graphics2D) g;
int x = 120, y = 90, width = 150, height = 150;
a2d.setColor(Color.red);
a2d.setStroke(new BasicStroke(3.0f)); // 设置线条宽度，3.0即线的宽度
a2d.drawOval(x, y, width, height);
}
}
Q4: 用Java一个简单的画图程序
下面是java画简单图形的代码我以前做的小程序java画简单图形的代码，希望能给你点帮助！
package menu;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DaYin extends JFrame implements ActionListener{
public DaYin() {
Container c=this.getContentPane();
c.setLayout(new BorderLayout());
JMenuBar jmb=new JMenuBar();
JMenu jm=null;
jm=new JMenu("文件");
jmb.add(jm);
jm=new JMenu("编辑");
jmb.add(jm);
jm=new JMenu("打印");
JMenuItem jmi=new JMenuItem("打印预览");
jmi.addActionListener(this);
jm.add(jmi);
jmb.add(jm);
jm=new JMenu("帮助");
jmb.add(jm);
this.setJMenuBar(jmb);
this.setSize(1024,768);
this.setVisible(true);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
public static void main(String[] args) {
new DaYin();
}
public void update(Graphics g){
g.setColor(Color.black);
String title[]={"摘要","科目","子目或户名","借方金额","贷方金额"};
String danwei[]={"千","百","十","万","千","百","十","元","角","分"};
int csx=200;//打印x的初始坐标
int csy=200;//打印y的初始坐标
int x=csx;
int y=csy;
int a=x+20;//打印字体x的初始坐标
int b=y+20;//打印字体y的初始坐标
int row=7;//一共打印出几条横线
int cul=5;//一共打印出几条竖线
int hangju=30;//线与线之间的纵向间距
int lieju=100;//线与线之间的横向间距
int yy=hangju*row+y;
int c=yy+20;
g.setFont(new Font("行楷",Font.TYPE1_FONT,24));
g.drawString("记 账 凭 证", x+160, y-40);//打印出记账凭证这几个字
g.drawLine(x+100, y-30, x+340, y-30);//打印出记账凭证下面的那条线
g.setFont(new Font("行楷",Font.TYPE1_FONT,13));
g.drawString("年 月 日 第_______号", x+260, y-10);
//g.drawLine(x+430, y-10, x+470, y-10);
for(int i=0;i=row;i++){
g.drawLine(x, y, cul*lieju+x+25, y);//此循环用于画出表格的行
if(i==0)
y+=hangju*2;
else
y+=hangju;
}
y=csy;
g.drawLine(x+lieju*3, y+hangju, cul*lieju+x, y+hangju);//打印出第一行半的横线
for(int j=0;j=cul;j++){
g.drawLine(x, y, x, row*hangju+y);//此循环用于画出表格的列
x+=lieju;
}
x=csx;
for(int z=0;zcul;z++){
g.setColor(Color.red);//设置颜色
g.setFont(new Font("",Font.TYPE1_FONT,13));//设置表头字体
if(z3)
g.drawString(title[z], a, b+hangju/2);
else
g.drawString(title[z], a, b);//为表格添加表头
a+=lieju;
}//76-89打印出一个表格形状
int xx=lieju*3+x+10;
for(int v=0;v=9;v++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju);//此循环用于画出表格的列
g.setFont(new Font("",Font.TYPE1_FONT,11));
g.drawString(danwei[v], xx-10, y+hangju+20);//为表格添加表头
if(v%2==0)
g.setColor(Color.red);//设置颜色
else
g.setColor(Color.BLUE);//设置颜色
xx+=10;
}
for(int n=0;n9;n++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju);//此循环用于画出表格的列
g.drawString(danwei[n],xx-10, y+hangju+20);//为表格添加表头
if(n%2==0)
g.setColor(Color.red);//设置颜色
else
g.setColor(Color.BLUE);//设置颜色
xx+=10;
}
g.drawString(danwei[9],xx-10, y+hangju+20);
g.setColor(Color.black);//设置颜色
for(int i=0;i=1;i++){
g.drawLine(x,yy , cul*lieju+x, yy);//此循环用于画出表格的行
yy+=hangju;
}
yy=hangju*row+y;
for(int j=0;j=3;j++){
g.drawLine(x, yy, x, (row+1)*hangju+y);//此循环用于画出表格的列
if(j0){
x+=lieju;
}else{
x+=lieju*3;
}
}//112-128打印出表格的最后一行单元格
x=csx;
g.setFont(new Font("",Font.TYPE1_FONT,13));
g.drawString("合 计",x+60, c);
g.drawString("会计主管 记账 出纳 审核 制证", x+30, yy+50);
g.drawLine(cul*lieju+x+25, y, cul*lieju+x+25, (row+1)*hangju+y);//打印出最后一列
g.drawString("记",cul*lieju+x+6, y+15);
g.drawString("账", cul*lieju+x+6, y+35);
g.drawString("√", cul*lieju+x+6, y+55);//134-136为最后一列写入字体
g.drawString("附",cul*lieju+x+35, y+75);
g.drawString("件", cul*lieju+x+35, y+95);
g.drawString("张", cul*lieju+x+35, y+175);//134-136为最后一列后写入字体
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand().equals("打印预览")){
this.repaint();
}
}
}
使用drawLine()做java画简单图形的代码了一个记账凭证。
执行点击"打印"子菜单"打印预览"就可显示出我们所画的"记账凭证表"
希望这个小程序能够给你点灵感
Q5: 如何用Java编写一个绘制图形的小程序？
import java.awt.*;
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
}
}
}
关于java画简单图形的代码和java绘图程序代码的介绍到此就结束了，不知道你从中找到你需要的信息了吗 ？如果你还想了解更多这方面的信息，记得收藏关注本站。
