左右移动之间的平滑过渡

Question

我开始在java中绘制正方形，我使用键侦听器来移动它们。 我似乎唯一的问题是，从一个方向移动到另一个方向之间的平滑过渡。我的意思是，例如，当我向右移动然后改变我的方向时，它停止一秒然后再次开始移动，但是向左移动。我试图顺利过渡到从右向左切换的地方，它会立即开始向那个方向发展而不是停止，然后继续前进。任何帮助都会很好，提前谢谢:)！

我的主要框架类：

postResult = function(list) {
  //var nameList, i, glist;
  glist = list;
  if (list.length > 0) {
    $("#result").html(list[0].name + "<br />" + list[0].salary);
  }


  postResult = function(list) {
    //var namesDepartmentList, i, glist;
    glist = list;
    if (list.length > 0) {
      $("#namesDepartment").html(list[0].name + "<br />" + list[0].department);
    }
  }

  nameList = "";
  for (i = 0; i < list.length; i += 1) {
    nameList = nameList + list[i].name + "<br />";
  }
  $("#names").html(nameList);



  namesDepartmentList = "";
  for (i = 0; i < list.length; i += 1) {
    namesDepartmentList = nameList + list[i].name + "<br />";
  }
  $("#namesDepartment").html(namesDepartmentList);
}

submit = function() {
  var searchWord = document.getElementById("key-word").value;
  query = new ChicagoEmployeesQuery(searchWord);
  $("#result").html("waiting...");
  query.getList(postResult);
  if (key_word.isEmpty()) {
    alert("No Matching Records Found");

  }
}


submit = function() {
  var searchWord = document.getElementById("key-word").value;
  query = new ChicagoEmployeesQuery(searchWord);
  $("#namesDepartment").html("waiting...");
  query.getList(postResult);

}

$(function() {
  $("#start").click(submit);
});

我的Screen类，我将广场绘制到JPanel

package mainpackages;

import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;

public class Frame extends JFrame implements KeyListener{
    Screen s;
    public static void main(String[] args) {
     new Frame();
    }

    public Frame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        setTitle("Drawing practice");
        setResizable(false);
        setLocationRelativeTo(null);
        addKeyListener(this); 
        init(); 
    }
    public void init() {
         s = new Screen();
         add(s);
        setVisible(true);
    }

    @Override
    public void keyPressed(KeyEvent e) {  

        if(e.getKeyCode() == e.VK_UP) {
            s.y -= s.deltay; 

        }
        if(e.getKeyCode() == e.VK_DOWN) {
            s.y += s.deltay;

        }
        if(e.getKeyCode() == e.VK_LEFT) {
            s.x -= s.deltax;

        }
        if(e.getKeyCode() == e.VK_RIGHT) {
            s.x += s.deltax;

        }
        repaint();

    }

    @Override
    public void keyReleased(KeyEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyTyped(KeyEvent e) {
        // TODO Auto-generated method stub

    }



}