// class ElevatorPanel.java
//:Assignment 4:
//:Student Name: Duo Zhou
//:Studnet Number: 722452
/**FileName: ElevatorPanel.java
* Date: July, 27, 2000
* Purpose: Learn how to use JFrame, JPanel, Synchronized method, creating
* multithread, the basic idea of creating GUI
* Name of Files: This assignment include Building.java, ConnectedWall.java,
* Elevator.java, ElevatorFrame.java, ElevatorPanel.java,
* Floor.java, MailDeliveryApp.java, MailPiece.java,
* Position.java, Robot.java
* Brief Discription: This file is added to simulate the movement of an elevator.
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import java.lang.*;
class ElevatorPanel extends JPanel {
private int currFloor; //user current Floor;
private int targetFloor; //user target floor;
private int r; //row;
private int c; //col;
private int width; //width of the container to hold the elevator;
private int height; //height of the container to hold the elevator;
private int level; //current pixel position of the up left corner of the elevator;
protected int diff;//the pixel difference of the user target floor and the user current floor;
protected static Building building;
protected Image humanImage;
protected Image robotImage;
public ElevatorPanel(int cf, int tf, Building b) {
this.building = b;
currFloor=cf;
targetFloor=tf;
r=80; c=25; //this is used to the elevator in the middle of it container;
width = 100; height = 150; //width and height of the container to hold the elevator;
if (targetFloor-currFloor >=0){ //if human's target floor is above the next floor,
level=r+10+(3-currFloor)*height; //calculate the pixel position of the up left
//corner of the elevator;
diff=(targetFloor-currFloor)*height; //the pixel difference of the user target
//floor and the user current floor;
}
else {
level=r+10+(3-currFloor)*height;
diff=(currFloor-targetFloor)*height; //if the user want to move down, then the diff must
//be current floor number - target floor number;
}
Toolkit tk=Toolkit.getDefaultToolkit(); //get Toolkit;
humanImage=tk.getImage("human.gif"); //get human image;
robotImage=tk.getImage("robot0.gif");
setBackground(Color.black); //set background to white;
Thread f_runner=new Thread() { //create a new thread to move the elevator;
public void run() {
while (diff>=0) {
Elevator currentElevator=building.getElevator(); //the elevator is synchronized
try {Thread.sleep(1);} //sleep 1 millisecond once the elevator moved one pixel;
catch(InterruptedException ex) {};
ElevatorPanel.this.paintImmediately(c, level-5, 150, height+5); //paint this elevator
//once a step it moved;
}
}
};
f_runner.start();
//setSize(150, 700);
}
//*************************** set the size of the panel; *******************************
public Dimension getPreferredSize()
{
return new Dimension(150, 700);
}
public Dimension getMaximumSize()
{
return getPreferredSize();
}
public Dimension getMinimumSize()
{
return getPreferredSize();
}
//**************************** the paintComponent method *******************************
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.white);
g.drawRect(c, r, width, height); //use rectangle to create a container for the elevator,
//at the 3rd floor;
g.drawRect(c, r+height, width, height); //create a container at the 2nd floor;
g.drawRect(c, r+2*height, width, height);//create a container at the 1st floor;
g.drawRect(c, r+3*height, width, height);//create a container at the basement;
if (targetFloor-currFloor >=0){ //if human's target floor is above the next floor,
//continues moveing human up;
g.setColor(Color.yellow);
g.drawRect(c+10, level, width-20, height-20); //draw the elevator, moving up;
if ((building.getRobot().getRow()>25) && (building.getRobot().getCol()>25) && (building.getRobot().getFloorNum()==currFloor)) g.drawImage(robotImage, 55, level+75, this);
g.drawImage(humanImage, 80, level+40, this); //draw the human image in the elevator
level--; diff--; //update the difference from the bottom of the elevator to the
//bottom of the next floor, and current pixel position of the elevator;
}
else if (targetFloor-currFloor <=0){
g.setColor(Color.yellow);
g.drawRect(c+10, level, width-20, height-20); //draw the elevator, moving down;
g.drawImage(humanImage, 75, level+50, this);// the bottom of the upper floor will become closer;
level++; diff--;
}
else return;
}
}