本世纪最大的难题,JAVA中 矩形和椭圆怎么做成用MOUSE拖动旋转,难倒我一周多了,谢谢

Question

本世纪最大的难题,JAVA中 矩形和椭圆怎么做成用MOUSE拖动旋转,难倒我一周多了,谢谢,最好有例子代码,谢谢了,解决问题给200分,能帮助我解决问题的也给分,谢谢了,谢谢大家.

Answer 1

Mouse拖动里面的捕获Mouse信息不用我说了吧
给你写了一个旋转的代码看看
public class TestPanel extends JPanel implements ActionListener{
  Timer timer=new Timer(100,this);
  double angle=0;
  public TestPanel() {
    timer.start();
  }
  public void paintComponent(Graphics g){
    super.paintComponent(g);
    Graphics2D g2=(Graphics2D)g;
    g2.rotate(angle,125,150);
    g2.drawRect(100,100,50,100);
    g2.rotate(-angle,125,150);
    g2.drawLine(50,50,100,50);
  }  public void actionPerformed(ActionEvent actionEvent) {
    angle+=Math.PI/100;
    if(angle>Math.PI*2){
      angle=angle-Math.PI*2;
    }
    this.repaint();
  }
}

Answer 2

http://www.finereport.com 可以的，而且做得很好的。

Answer 3

class   LXXPanel extends JPanel{
          private ImageIcon icon;
          private Image image;
          private AffineTransform t;
          private static int translate=100;
          private static int rotate=30;
          private static int Count=0;
          private static int CountArea=0;
          private Area area;
          public LXXPanel()
         {
             icon=new ImageIcon(getClass().getResource("fight.gif"));
             t=new AffineTransform();
             t.setToTranslation(300,100);
             image=icon.getImage();
             addMouseListener(new MouseAdapter()
                     {
                      public void mouseClicked(MouseEvent event)
                         {
                             Point2D point =event.getPoint();
                             rotate(point);                         }
                     });
             addMouseMotionListener(new MouseMotionAdapter()
                     {
                         public void mouseDragged(MouseEvent event)
                         {
                             pictureDragged(event.getPoint());                         }
                     });
              area=new Area();
         }
      public void repaint()
      {
             System.out.println("DO repaint?");
             Graphics g2=this.getGraphics();
             paintComponent(g2);
      }
      public void paintComponent(Graphics g)
      {
          super.paintComponent(g);
          Graphics2D g2=(Graphics2D)g;
          g2.drawImage(image,t,null);
          System.out.println(area.isEmpty());
          if(area.isEmpty())
          {
              area=new Area(new Rectangle2D.Double(100,100,100,100));
              g2.fill(area);
              System.out.println("do?");
              g2.drawString("It is the area repaint "+Integer.toString(CountArea++),200,200);
          }
          g2.drawString("It is the whole panel repaint "+Integer.toString(Count++),100,100);      }
      public void rotate(Point2D point)
      {
        if(rotate>360) rotate=0;
          t.setToRotation(Math.toRadians(rotate),point.getX(),point.getY());
           rotate+=30;
          repaint();
      }
      public void translate()
      {
      }
      public void sheer()
      {
      }
       public void pictureDragged(Point2D point)
       {
         //  t.setToTranslation(point.getX(),point.getY());
           t=new AffineTransform().getTranslateInstance(point.getX(),point.getY());
            repaint();
         }      }
部分代码 拿去改改  根据鼠标移动点重画就行

Answer 4

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;
 
public class DragDemo extends JPanel
{
    Rectangle r;
 
    public DragDemo()
    {
        DragController controller = new DragController(this);
        addMouseListener(controller);
        addMouseMotionListener(controller);
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if(r == null)
            initRect();
        g2.draw(r);
    }
 
    protected void setRect(int x, int y)
    {
        r.setLocation(x, y);
        repaint();
    }
 
    private void initRect()
    {
        int w = getWidth();
        int h = getHeight();
        r = new Rectangle(w/4, h/3, w/2, h/6);
    }
 
    public static void main(String[] args)
    {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new DragDemo());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}
 
class DragController extends MouseInputAdapter
{
    DragDemo demo;
    Point offset;
    boolean dragging;
 
    public DragController(DragDemo dd)
    {
        demo = dd;
        offset = new Point();
        dragging = false;
    }
 
    public void mousePressed(MouseEvent e)
    {
        Point p = e.getPoint();
        if(demo.r.contains(p))
        {
            offset.x = p.x - demo.r.x;
            offset.y = p.y - demo.r.y;
            dragging = true;
        }
    }
 
    public void mouseReleased(MouseEvent e)
    {
        dragging = false;
    }
 
    public void mouseDragged(MouseEvent e)
    {
        if(dragging)
        {
            int x = e.getX() - offset.x;
            int y = e.getY() - offset.y;
            demo.setRect(x, y);
        }
    }
}