медленно перемещая круг в определенное место

Question

Я пытаюсь заставить круг медленно перемещаться в определенном месте, но он не работает круг перемещается в это место незамедлительно без задержек между перерисовыванием холста и i не понимаю почему. (В mouseUPListener круг должен двигаться медленно в исходное место)

вот мой код: ПЕРВЫЙ КЛАСС:

import org.eclipse.swt.SWT; 
import org.eclipse.swt.events.MouseEvent; 
import org.eclipse.swt.events.MouseListener; 
import org.eclipse.swt.events.MouseMoveListener; 
import org.eclipse.swt.events.PaintEvent; 
import org.eclipse.swt.events.PaintListener; 
import org.eclipse.swt.widgets.Canvas; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 

public class MouseListenerUsing { 
    static int i =0, R1=75,inCircleX=100,inCircleY=100,oldX,oldY; 
    static int outCircleX=inCircleX , outCircleY=inCircleY, R2=200,distX,distY,IT_NUM=100; 
    static Canvas c; 
    static Display display; 
    static boolean flagY=false,flagX=false; 
    static SecondClass se; 
    public static void main(String[] args) { 
    display = new Display(); 
    Shell shell = new Shell(display); 
    shell.setSize(430, 460); 
    c=new Canvas(shell,SWT.BORDER); 
    c.setSize(370,380); 
    c.setLocation(21, 21); 

    c.addPaintListener(new PaintListener(){ 
     public void paintControl(PaintEvent e) { 
      e.gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE)); 
      e.gc.drawOval(outCircleX-((R2-R1)/2), outCircleY-((R2-R1)/2), R2, R2); 
      e.gc.fillOval(inCircleX, inCircleY, R1, R1); 
     }  
    });  
    c.addMouseMoveListener(new MouseMoveListener(){ 
     @Override 
     public void mouseMove(MouseEvent e){ 
      if (i==2) 
      { 
       if (Math.sqrt(Math.pow((inCircleX+(R1/2))-((outCircleX-((R2-R1)/2)+(R2/2))),2)+Math.pow((inCircleY+(R1/2))-((outCircleY-((R2-R1)/2))+(R2/2)),2))<=R2/2) 
       { // distance between the two centers         
        inCircleX = e.x+oldX; 
        inCircleY = e.y+oldY; 
        c.redraw(); 
       } 
      } 
     }  
    }); 
    c.addMouseListener(new MouseListener() { 
     public void mouseDoubleClick(MouseEvent e) {} 
     public void mouseDown(MouseEvent e) 
     {   
      if (Math.sqrt(Math.pow(e.x-inCircleX-R1/2,2)+Math.pow(e.y-inCircleY-R1/2,2))<=R1/2) 
      { 
       oldX=inCircleX-e.x; 
       oldY=inCircleY-e.y; 
       i=2; 
      } 
     } 
     public void mouseUp(MouseEvent e) 
     { 
      if ((inCircleX+(R1/2))>(outCircleX-((R2-R1)/2)+(R2/2))) flagX=true; 
      else if ((inCircleX+(R1/2))<(outCircleX-((R2-R1)/2)+(R2/2))) flagX=false; 
      if ((inCircleY+(R1/2))>(outCircleY-((R2-R1)/2)+(R2/2))) flagY=true; 
      else if ((inCircleY+(R1/2))<(outCircleY-((R2-R1)/2)+(R2/2))) flagY=false; 
      distX = ((inCircleX+(R1/2))-((outCircleX-((R2-R1)/2)+(R2/2))))/IT_NUM; 
      distX = ((inCircleY+(R1/2))-((outCircleY-((R2-R1)/2)+(R2/2))))/IT_NUM; 
      se = new SecondClass(); 
      display.timerExec(1000, se);    

      inCircleX = outCircleX; 
      inCircleY = outCircleY; 
      c.redraw(); 
      i=1; 
     } 
    }); 
    shell.open(); 
    while(!shell.isDisposed()) 
     if (!display.readAndDispatch()) 
      display.sleep();  
    display.dispose(); 
    } 
} 

ВТОРОЙ КЛАСС:

public class SecondClass implements Runnable{ 
    static int i =MouseListenerUsing.IT_NUM; 
    @Override 
    public void run() { 
     Surfing(); 

    } 
    public void Surfing() 
    { 
     if (i>0){ 
      if (MouseListenerUsing.flagX==true) MouseListenerUsing.inCircleX = MouseListenerUsing.inCircleX - MouseListenerUsing.distX; 
      if (MouseListenerUsing.flagX==false) MouseListenerUsing.inCircleX = MouseListenerUsing.inCircleX + MouseListenerUsing.distX; 
      if (MouseListenerUsing.flagY==true) MouseListenerUsing.inCircleY = MouseListenerUsing.inCircleY - MouseListenerUsing.distY; 
      if (MouseListenerUsing.flagY==false) MouseListenerUsing.inCircleY = MouseListenerUsing.inCircleY + MouseListenerUsing.distY; 
      MouseListenerUsing.c.redraw(); 
      i--; 
     } 
     if (i==0) 
     { 
      MouseListenerUsing.display.timerExec(-1, MouseListenerUsing.se); 
     } 
    } 




} 

Может кто-нибудь объяснить мне мой проблемы и предложить soloution? Спасибо

новый код:

import org.eclipse.swt.SWT; 
import org.eclipse.swt.events.MouseEvent; 
import org.eclipse.swt.events.MouseListener; 
import org.eclipse.swt.events.MouseMoveListener; 
import org.eclipse.swt.events.PaintEvent; 
import org.eclipse.swt.events.PaintListener; 
import org.eclipse.swt.widgets.Canvas; 
import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.Shell; 

public class MouseListenerUsing { 
    static int i =0, R1=75,inCircleX=100,inCircleY=100,oldX,oldY,count=0; 
    static int outCircleX=inCircleX , outCircleY=inCircleY, R2=200,distX,distY,IT_NUM=20; 
    static boolean flagY=false,flagX=false; 

    public static void main(String[] args) { 
    final Display display = new Display(); 
    Shell shell = new Shell(display); 
    shell.setSize(430, 460); 
    final Canvas c=new Canvas(shell,SWT.BORDER); 
    c.setSize(370,380); 
    c.setLocation(21, 21); 

    c.addPaintListener(new PaintListener(){ 
     public void paintControl(PaintEvent e) { 
      e.gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE)); 
      e.gc.drawOval(outCircleX-((R2-R1)/2), outCircleY-((R2-R1)/2), R2, R2); 
      e.gc.fillOval(inCircleX, inCircleY, R1, R1);  
     }  
    });  
    c.addMouseMoveListener(new MouseMoveListener(){ 
     @Override 
     public void mouseMove(MouseEvent e){ 
      if (i==2) 
      { 
       if (Math.sqrt(Math.pow((inCircleX+(R1/2))-((outCircleX-((R2-R1)/2)+(R2/2))),2)+Math.pow((inCircleY+(R1/2))-((outCircleY-((R2-R1)/2))+(R2/2)),2))<=R2/2) 
       { // distance between the two centers         
        inCircleX = e.x+oldX; 
        inCircleY = e.y+oldY; 
        c.redraw(); 
       } 
      } 
     }  
    }); 
    c.addMouseListener(new MouseListener() { 
     public void mouseDoubleClick(MouseEvent e) {} 
     public void mouseDown(MouseEvent e) 
     {   
      if (Math.sqrt(Math.pow(e.x-inCircleX-R1/2,2)+Math.pow(e.y-inCircleY-R1/2,2))<=R1/2) 
      { 
       oldX=inCircleX-e.x; 
       oldY=inCircleY-e.y; 
       i=2; 
      } 
     } 
     public void mouseUp(MouseEvent e) 
     {   
      i=1;    
      if ((inCircleX+(R1/2))>(outCircleX-((R2-R1)/2)+(R2/2))) flagX=true; 
      else if ((inCircleX+(R1/2))<(outCircleX-((R2-R1)/2)+(R2/2))) flagX=false; 
      if ((inCircleY+(R1/2))>(outCircleY-((R2-R1)/2)+(R2/2))) flagY=true; 
      else if ((inCircleY+(R1/2))<(outCircleY-((R2-R1)/2)+(R2/2))) flagY=false; 
      //it = (Math.sqrt(Math.pow((inCircleX+(R1/2))-((outCircleX-((R2-R1)/2)+(R2/2))),2)+Math.pow((inCircleY+(R1/2))-((outCircleY-((R2-R1)/2))+(R2/2)),2))); //distance between centers 
      distX = ((inCircleX+(R1/2))-((outCircleX-((R2-R1)/2)+(R2/2))))/IT_NUM; 
      distY = ((inCircleY+(R1/2))-((outCircleY-((R2-R1)/2)+(R2/2))))/IT_NUM; 
      final Runnable drawThread = new Runnable() 
      { 
       @Override 
       public void run() {  

        if (flagX==true) inCircleX = inCircleX - distX; 
        if (flagX==false) inCircleX = inCircleX + distX; 
        if (flagY==true) inCircleY = inCircleY - distY; 
        if (flagY==false) inCircleY = inCircleY + distY; 
        c.redraw(); 
        IT_NUM--; 
        System.out.println(IT_NUM); 
        if (IT_NUM==17) 
        {       
         display.timerExec(-1, this); 

        } 
        display.timerExec(10, this);    
       } 

      }; 
      display.timerExec(10, drawThread); 
      //display.timerExec(-1, drawThread); 
      System.out.println("hello"); 
      //inCircleX = outCircleX; 
      //inCircleY = outCircleY; 
      c.redraw(); 
     } 
    }); 
    shell.open(); 
    while(!shell.isDisposed()) 
     if (!display.readAndDispatch()) 
      display.sleep();  
    display.dispose(); 
    } 
} 

Answer 1

Вот простой пример для вас. Он будет перемещать круг из верхнего левого угла вправо:

private static int   x    = 0; 
private static int   y    = 0; 
private static int   r    = 5; 

// The timer interval in milliseconds 
private static final int TIMER_INTERVAL = 10; 

public static void main(String[] args) 
{ 
    final Display display = new Display(); 
    Shell shell = new Shell(display); 
    shell.setLayout(new FillLayout()); 

    final Canvas canvas = new Canvas(shell, SWT.NONE); 

    canvas.addListener(SWT.Paint, new Listener() 
    { 
     @Override 
     public void handleEvent(Event e) 
     { 
      e.gc.drawOval(x++, y++, r, r); 
     } 
    }); 

    final Runnable drawThread = new Runnable() 
    { 
     @Override 
     public void run() 
     { 
      canvas.redraw(); 

      if(x < 400 && y < 400) 
       display.timerExec(TIMER_INTERVAL, this); 
     } 
    }; 

    display.timerExec(TIMER_INTERVAL, drawThread); 

    shell.pack(); 
    shell.setSize(400, 400); 
    shell.open(); 
    while (!shell.isDisposed()) 
     if (!display.readAndDispatch()) 
      display.sleep(); 

    // Kill the timer 
    display.timerExec(-1, drawThread); 
    display.dispose(); 
} 

Answer 2

Вы можете начать использовать фреймворк для улучшения управления анимацией. Я использовал

https://kenai.com/projects/trident/pages/Home

и

https://java.net/projects/timingframework

оба они довольно хорошо. У Trident есть поддержка SWT (Да внутри он использует Display.timerExec())