这是我的整个代码块，DrawForm用于绘制矩形，椭圆等。当我绘制椭圆时，它计算椭圆的数量并将其保存到数组并尽快打印数组的大小绘制椭圆。所以我想要的是使用变量＆＃34;尺寸＆＃34;用于获取数组的大小并将其发送到＆＃34; AttributeForm＆＃34;并在其上发表我的IF声明。
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
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.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;
import javax.imageio.ImageIO;
import javax.swing.Box;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.filechooser.FileNameExtensionFilter;
public class DrawForm extends JFrame {
private int len;
// public int getSizes(){
// return len;
//}
private static final long serialVersionUID = -140274271716086522L;
JMenuBar menubar;
JMenu File, Exit;
JMenuItem New, Open;
JComponent DrawingBoard;
JButton lineBut, ellipseBut, rectBut, strokeBut;
DecimalFormat dec = new DecimalFormat("#.##");
// Contains all of the rules for drawing
Graphics2D graphSettings;
// Going to be used to monitor what shape to draw next
int currentAction = 1;
// Transparency of the shape
// Default stroke and fill colors
Color strokeColor = Color.BLACK;
public static void main(String[] args) {
new DrawForm();
}
public DrawForm() {
// Define the defaults for the JFrame
this.setSize(800, 600);
this.setTitle("ERD BUILDER");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setJMenuBar(menubar);
JMenuBar menuBar = new JMenuBar();
// Add the menubar to the frame
setJMenuBar(menuBar);
// Define and add two drop down menu to the menubar
JMenu fileMenu = new JMenu("File");
JMenu editMenu = new JMenu("Edit");
JMenu dbMenu = new JMenu("Database");
JMenu ToolsMenu = new JMenu("Tools");
JMenu HelpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(dbMenu);
menuBar.add(ToolsMenu);
menuBar.add(HelpMenu);
// Create and add simple menu item to one of the drop down menu
JMenuItem newAction = new JMenuItem("New Project");
JMenuItem openAction = new JMenuItem("Open File");
JMenuItem exitAction = new JMenuItem("Quit");
JMenuItem cutAction = new JMenuItem("Cut");
JMenuItem copyAction = new JMenuItem("Copy");
JMenuItem pasteAction = new JMenuItem("Paste");
JMenuItem UndoAction = new JMenuItem("Undo");
JMenuItem RedoAction = new JMenuItem("Redo");
JMenuItem clearAction = new JMenuItem("Clear");
JMenuItem saveAction = new JMenuItem("Save");
JMenuItem exportAction = new JMenuItem("Export");
JMenuItem printAction = new JMenuItem("Print");
JMenuItem ConvertAction = new JMenuItem("Convert To Tables");
JMenuItem ColorAction = new JMenuItem("Color Picker");
JMenuItem ZoomAction = new JMenuItem("Zoom");
JMenuItem EntityAction = new JMenuItem("Entity & Attributes");
JMenuItem RelationshipAction = new JMenuItem("Relationship Attributes");
JMenuItem HelpAction = new JMenuItem("Help");
JMenuItem AboutAction = new JMenuItem("About");
fileMenu.add(newAction);
fileMenu.addSeparator();
fileMenu.add(openAction);
fileMenu.addSeparator();
fileMenu.add(saveAction);
fileMenu.addSeparator();
fileMenu.add(exportAction);
fileMenu.addSeparator();
fileMenu.add(printAction);
fileMenu.addSeparator();
fileMenu.add(exitAction);
editMenu.add(UndoAction);
editMenu.addSeparator();
editMenu.add(RedoAction);
editMenu.addSeparator();
editMenu.add(cutAction);
editMenu.addSeparator();
editMenu.add(copyAction);
editMenu.addSeparator();
editMenu.add(pasteAction);
editMenu.addSeparator();
editMenu.add(clearAction);
dbMenu.add(ConvertAction);
ToolsMenu.add(ColorAction);
ToolsMenu.addSeparator();
ToolsMenu.add(ZoomAction);
ToolsMenu.addSeparator();
ToolsMenu.add(EntityAction);
ToolsMenu.addSeparator();
ToolsMenu.add(RelationshipAction);
HelpMenu.add(HelpAction);
HelpMenu.addSeparator();
HelpMenu.add(AboutAction);
exitAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}}
);
ConvertAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
new ConvertForm().setVisible(true);
}}
);
newAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
new DrawForm.setVisible(true);
}
});
JPanel buttonPanel = new JPanel();
JPanel FieldPanel = new JPanel();
// Swing box that will hold all the buttons
Box theBox = Box.createVerticalBox();
Box theBoxs = Box.createVerticalBox();
// Make all the buttons in makeMeButtons by passing the
// button icon.
lineBut = makeMeButtons("./src/line.png", 2);
ellipseBut = makeMeButtons("./src/ellipse.png", 3);
rectBut = makeMeButtons("./src/rectangle.png", 4);
// Make all the buttons in makeMeColorButton by passing the
// button icon and true for stroke color or false for fill
strokeBut = makeMeColorButton("./src/stroke.png", 5, true);
// Add the fields to the boxs
//theBox.add(brushBut);
theBox.add(lineBut);
theBox.add(ellipseBut);
theBox.add(rectBut);
theBox.add(strokeBut);
buttonPanel.add(theBox);
FieldPanel.add(theBoxs);
this.add(buttonPanel, BorderLayout.WEST);
this.add(FieldPanel, BorderLayout.EAST);
buttonPanel.setPreferredSize(new Dimension(200,480));
FieldPanel.setPreferredSize(new Dimension(200,480));
// Make the drawing area take up the rest of the frame
// this.add(new DrawingBoard(), BorderLayout.CENTER);
final DrawingBoard drawPanel = new DrawingBoard();
this.add(drawPanel, BorderLayout.CENTER);
this.getContentPane().setBackground(Color.WHITE);
exportAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
BufferedImage image = new BufferedImage(drawPanel.getWidth(),
drawPanel.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
drawPanel.paint(g);
g.dispose();
JFileChooser fileChooser = new JFileChooser();
File theDirectory = new File("C:/Users/Wenda/Desktop");
fileChooser.setCurrentDirectory(theDirectory);
FileNameExtensionFilter pngFilter = new FileNameExtensionFilter(
"PNG file (*.png)", "png");
fileChooser.addChoosableFileFilter(pngFilter);
fileChooser.setFileFilter(pngFilter);
int status = fileChooser.showSaveDialog(Lesson49_1.this);
if (status == JFileChooser.APPROVE_OPTION) {
try {
ImageIO.write(image, "png",
fileChooser.getSelectedFile());
JOptionPane.showMessageDialog(null, "Image saved to "
+ fileChooser.getSelectedFile().getName());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
});
// Show the frame
this.setVisible(true);
}
public JButton makeMeButtons(String iconFile, final int actionNum) {
JButton theBut = new JButton();
Icon butIcon = new ImageIcon(iconFile);
theBut.setIcon(butIcon);
theBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
currentAction = actionNum;
}
});
return theBut;
}
// Spits out buttons based on the image supplied and
// whether a stroke or fill is to be defined
public JButton makeMeColorButton(String iconFile, final int actionNum,
final boolean stroke) {
JButton theBut = new JButton();
Icon butIcon = new ImageIcon(iconFile);
theBut.setIcon(butIcon);
theBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (stroke) {
// JColorChooser is a popup that lets you pick a color
strokeColor = JColorChooser.showDialog(null,
"Pick a Stroke", Color.BLACK);
} else {
}
}
});
return theBut;
}
public class DrawingBoard extends JComponent {
private static final long serialVersionUID = -4431176095451940075L;
// ArrayLists that contain each shape drawn along with
// that shapes stroke and fill
ArrayList<Shape> shapes = new ArrayList<Shape>();
ArrayList<Color> shapeStroke = new ArrayList<Color>();
ArrayList<Integer> count = new ArrayList<Integer>();
Point drawStart, drawEnd;
// Monitors events on the drawing area of the frame
public DrawingBoard() {
this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (currentAction != 1) {
// When the mouse is pressed get x & y position
drawStart = new Point(e.getX(), e.getY());
drawEnd = drawStart;
repaint();
}
}
public void mouseReleased(MouseEvent e) {
int counts =0;
if (currentAction != 1) {
Shape aShape = null;
if (currentAction == 2) {
aShape = drawLine(drawStart.x, drawStart.y,
e.getX(), e.getY());
shapes.add(aShape);
shapeStroke.add(strokeColor);
drawStart = null;
drawEnd = null;
repaint();
} else
if (currentAction == 3) {
aShape = drawEllipse(drawStart.x, drawStart.y,
e.getX(), e.getY());
shapes.add(aShape);
shapeStroke.add(strokeColor);
drawStart = null;
drawEnd = null;
repaint();
counts = counts+1;
count.add(counts);
int sizes = count.size();
System.out.println(sizes);
new AttributeForm().setVisible(true);
} else
if (currentAction == 4) {
// Create a new rectangle using x & y coordinates
aShape = drawRectangle(drawStart.x, drawStart.y,
e.getX(), e.getY());
shapes.add(aShape);
shapeStroke.add(strokeColor);
drawStart = null;
drawEnd = null;
repaint();
new EntityForm().setVisible(true);
}
// Add shapes, fills and colors to there ArrayLists
}
}
});
this.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent me) {
JTextField name = new JTextField(15);
super.mouseClicked(me);
for (Shape s : shapes) {
if (s.contains(me.getPoint())) {//check if mouse is clicked within shape
//we can either just print out the object class name
System.out.println("Clicked a "+s.getClass().getName());
//or check the shape class we are dealing with using instance of with nested if
if (s instanceof Rectangle2D) {
//create table
}
else if (s instanceof Ellipse2D) {
}
}
}
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
// If this is a brush have shapes go on the screen quickly
if (currentAction == 1) {
int x = e.getX();
int y = e.getY();
Shape aShape = null;
shapes.add(aShape);
shapeStroke.add(strokeColor);
// Add the transparency value
}
// Get the final x & y position after the mouse is dragged
drawEnd = new Point(e.getX(), e.getY());
repaint();
}
});
}
public void paint(Graphics g) {
// Class used to define the shapes to be drawn
graphSettings = (Graphics2D) g;
// Antialiasing cleans up the jagged lines and defines rendering
// rules
graphSettings.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// Defines the line width of the stroke
graphSettings.setStroke(new BasicStroke(4));
// Iterators created to cycle through strokes and fills
Iterator<Color> strokeCounter = shapeStroke.iterator();
for (Shape s : shapes) {
// Grabs the next stroke from the color arraylist
graphSettings.setPaint(strokeCounter.next());
graphSettings.draw(s);
}
// Guide shape used for drawing
if (drawStart != null && drawEnd != null) {
// Makes the guide shape transparent
graphSettings.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, 0.40f));
// Make guide shape gray for professional look
graphSettings.setPaint(Color.LIGHT_GRAY);
Shape aShape = null;
if (currentAction == 2) {
aShape = drawLine(drawStart.x, drawStart.y, drawEnd.x,
drawEnd.y);
} else
if (currentAction == 3) {
aShape = drawEllipse(drawStart.x, drawStart.y, drawEnd.x,
drawEnd.y);
} else
if (currentAction == 4) {
// Create a new rectangle using x & y coordinates
aShape = drawRectangle(drawStart.x, drawStart.y, drawEnd.x,
drawEnd.y);
}
graphSettings.draw(aShape);
}
}
private Rectangle2D.Float drawRectangle(int x1, int y1, int x2, int y2) {
// Get the top left hand corner for the shape
// Math.min returns the points closest to 0
int x = Math.min(x1, x2);
int y = Math.min(y1, y2);
// Gets the difference between the coordinates and
int width = Math.abs(x1 - x2);
int height = Math.abs(y1 - y2);
return new Rectangle2D.Float(x, y, width, height);
}
private Ellipse2D.Float drawEllipse(int x1, int y1, int x2, int y2) {
int x = Math.min(x1, x2);
int y = Math.min(y1, y2);
int width = Math.abs(x1 - x2);
int height = Math.abs(y1 - y2);
return new Ellipse2D.Float(x, y, width, height);
}
private Line2D.Float drawLine(int x1, int y1, int x2, int y2) {
return new Line2D.Float(x1, y1, x2, y2);
}
}
}
这是我的AttributeForm：
public class AttributeForm {
public static void main (String args[]){
//if sizes is >1
System.out.println("Greater than one");
//else
System.out.println("Less than one");
}
}
你有什么建议？
答案 0 :(得分：0)
问题是DrawForm和AttributeForm都有自己的“主”方法，所以它们作为2个完全独立的应用程序运行。由于它们是2个独立的应用程序，因此无法访问彼此的变量。我认为你需要从两个Form类中删除“main”方法，并使用单个“main”方法创建另一个类，然后启动DrawForm和AttributeForm。例如：
如果你想从DrawForm中检索变量“sizes”，你需要在DrawForm类中为该变量获取一个getter
//assuming sizes is an integer
public int getSizes(){
return sizes;
}
如果要在AttributeForm上设置变量“sizes”，则需要在AttributeForm类中为该变量设置一个setter
//assuming sizes is an integer
public void setSizes(int sizes){
this.sizes = sizes;
}
您的AttributeForm可能如下所示
public class AttributeForm {
int sizes;
public void setSizes(int sizes){
this.sizes = sizes;
}
public void doSomething(){
if(this.sizes > 1)
System.out.println("Greater than one");
else
System.out.println("Less than one");
}
}
最后，新课程，一个“主”开始一切
public class MyApplication
{
public static void main(String[] args)
{
DrawForm dform = new DrawForm();
dform.setVisible(true);
int sizes = dform.getSizes();
AttributeForm aform = new AttributeForm();
aform.setSizes(sizes);
aform.doSomething();
}
}