import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class ShapeApplet extends JApplet{
//contains all shapes that created
private ShapeContainer shapeContaiter = new ShapeContainer();
//main window panels
private Panel leftPanel = new Panel();
private Panel rightPanel = new Panel();
private Panel buttomPanel = new Panel();
//the panel inside right panel
private Panel shapesPanel = new Panel();
private String [] shapeNames = {"Cicle","Rect","Polygon","Line","Cylinder"};
private Choice shapeChoice = new Choice();
//defines the colors to choose from
JColorChooser colorChooser = new JColorChooser(Color.BLACK);
//item that will be use for painting
private Shape shapeToDraw;
//creating shapesButtons
ImageIcon iconCircle = new ImageIcon("circle.png", "Circle");
JButton buttonCircle = new JButton(iconCircle);
ImageIcon iconLine = new ImageIcon("line.png","Line");
JButton buttonLine = new JButton(iconLine);
ImageIcon iconRect = new ImageIcon("rect.png","Line");
JButton buttonRect = new JButton(iconRect);
ImageIcon iconPolygon = new ImageIcon("polygon.png","Line");
JButton buttonPolygon = new JButton(iconPolygon);
//creating the other tool buttons
JButton buttonClear = new JButton("Undo");
Checkbox checkBoxIsTheShapeFilled = new Checkbox("Filled");
//defines the new canvas
PaintingCanvas paintingCanvas = new PaintingCanvas();
//defines the class for buttons actions
ButtonAction buttonAction = new ButtonAction();
//save the shape that selected
private int currentTool = 4;
//integers to keep the mouse location
private int xPoint1, xPoint2 = 0, yPoint1,yPoint2 = 0;
@Override
public void init() {
System.out.println("points" + xPoint1+yPoint2);
//setting location , size and properties
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = (int) dim.getWidth();
int screenHeight = (int) dim.getHeight();
this.setSize(screenWidth,screenHeight-400);
//setting layout
this.setLayout(new BorderLayout());
//creating the choices for shapes
for(int i = 0 ; i < shapeNames.length ; i++ )
shapeChoice.add(shapeNames[i]);
//defines left Panel and right Panel properties
this.leftPanel.setBackground(Color.LIGHT_GRAY);
this.leftPanel.setLayout(new GridLayout(5, 0));
this.rightPanel.setBackground(Color.LIGHT_GRAY);
this.rightPanel.setLayout(new BorderLayout());
//adding items to the right panel
this.rightPanel.add(colorChooser, BorderLayout.NORTH);
//setting the shapes panel
this.shapesPanel.setLayout(new GridLayout(3,3));
this.shapesPanel.add(buttonCircle);
this.shapesPanel.add(buttonLine);
this.shapesPanel.add(buttonRect);
this.shapesPanel.add(buttonPolygon);
this.shapesPanel.add(checkBoxIsTheShapeFilled);
//adding the shapes panel to the right Panel
this.rightPanel.add(shapesPanel, BorderLayout.SOUTH);
//adding items to the left panel
this.leftPanel.add(buttonClear);
//defines the location of each item on the main window
this.add(leftPanel, BorderLayout.WEST);
this.add(rightPanel, BorderLayout.EAST);
this.add(buttomPanel,BorderLayout.SOUTH);
this.add(paintingCanvas,BorderLayout.CENTER);
//setting button actions
this.buttonCircle.addActionListener(buttonAction);
this.buttonLine.addActionListener(buttonAction);
this.buttonPolygon.addActionListener(buttonAction);
this.buttonRect.addActionListener(buttonAction);
this.buttonClear.addActionListener(buttonAction);
}
@Override
public void start() {
super.start();
}
@Override
public void stop() {
super.stop();
}
@Override
public void destroy() {
super.destroy();
}
public class PaintingCanvas extends Canvas implements MouseListener, MouseMotionListener
{
public PaintingCanvas()
{
addMouseListener(this);
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
xPoint1 = e.getX();
yPoint1 = e.getY();
xPoint2 = e.getX();
yPoint2 = e.getY();
}//end of mousePressed
@Override
public void mouseReleased(MouseEvent e) {
xPoint2 = e.getX();
yPoint2 = e.getY();
shapeContaiter.add(shapeToDraw);
System.out.println("Release");
repaint();
}
@Override
public void update(Graphics g) {
paint(g);
}//end of update
@Override
public void paint(Graphics g) {
switch (currentTool)
{
case 0:
//System.out.println("Circle pointsxy: " + xPoint1+","+yPoint1);
//System.out.println("Circle pointsx2y2: " + xPoint2+","+yPoint2);
shapeToDraw = new Circle(xPoint1 , yPoint1, new Point(xPoint2, yPoint2),colorChooser.getColor() , checkBoxIsTheShapeFilled.getState());
//System.out.println( "Circle pointsxy: " + shapeToDraw.getLocation());
shapeToDraw.draw(g);
break;
case 1:
shapeToDraw = new Line(xPoint1, yPoint1, new Point(xPoint2,yPoint2), colorChooser.getColor(), checkBoxIsTheShapeFilled.getState());
shapeToDraw.draw(g);
break;
case 2:
break;
case 3:
shapeToDraw = new Rect(xPoint1, yPoint1, new Point(xPoint2, yPoint2), colorChooser.getColor(), checkBoxIsTheShapeFilled.getState());
shapeToDraw.draw(g);
break;
case 4:
break;
default:
}//end of switch
System.out.println("Size of shapeContianer: "+shapeContaiter.size());
System.out.println("pointsxy: " + xPoint1+","+yPoint1);
System.out.println("pointsx2y2: " + xPoint2+","+yPoint2);
}//end of paint
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
}//end of canvas
public class ButtonAction implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e) {
if ( e.getSource() == buttonCircle)
currentTool = 0;
else if ( e.getSource() == buttonLine)
currentTool = 1;
else if ( e.getSource() == buttonPolygon)
currentTool = 2;
else if ( e.getSource() == buttonRect)
currentTool = 3;
else if (e.getSource() == buttonClear){
currentTool=4;
if(shapeContaiter.isEmpty()) JOptionPane.showMessageDialog(buttonClear, "Nothing to delete");
else {
Graphics g = paintingCanvas.getGraphics();
shapeContaiter.get(shapeContaiter.size()-1).setColor(Color.WHITE);
shapeContaiter.get(shapeContaiter.size()-1).draw(g);
shapeContaiter.remove(shapeContaiter.size()-1);
System.out.println("Size of shapeContianer: "+shapeContaiter.size());
}
}
}//end of action performed
}//end of ButtonClicked
}
我正在尝试创建一个撤消按钮，它将从shapeContainer数组和画布中删除最后一个形状。 我可以把手指放在问题上，但是当我试图擦除形状时，它会擦除我在当前形状之前绘制的形状。
我创建了Circle，Rect，Polygon，Line类，经过大量检查后似乎没问题。
答案 0 :(得分：0)
ShapeContainer班？相反，为什么不使用堆栈http://download.oracle.com/javase/6/docs/api/java/util/Stack.html Action类可能对您有用。）