Download Source Code:
Skyline.java (7k)

Launch Applet >>

               Purpose:  This applet will use the drawPolygon() method from
               the Graphics class to draw a city skyline within the
               applet. The applet will contain a button which will
               change the city's background to night or day when
               it is pressed. A counter will be used to make the 
               distinction of night and day by assigning all the even
               values to the day and all the odd values to the night.

               (fm)

               
               Date:                  4/28/02
               -----------------------------------------------------------
               */

                 
                 import java.applet.*;
                 import java.awt.*;
                 import java.awt.event.*;

                 public class Skyline extends Applet implements ActionListener
                 {
                    int xPoints[] = {0,80,80,120,120,140,140,160,160,180,180,
                    200,200,220,220,280,280,320,320,340,340,
                    380,380,400,400,420,420,460,460,480,480,540,
                    540,620,620,640,640,0,0};

                    int yPoints[]  = {240,240,340,340,400,400,240,220,360,360,
                    400,400,380,380,280,280,360,360,300,300,
                    260,280,380,380,400,400,140,140,340,340,
                    280,280,220,220,260,260,480,480,240};

                    int counter = 2; // day/night counter

                    Polygon city = new Polygon(xPoints, yPoints, xPoints.length);
                 
                    Color blueGray = new Color(33,66,99);

                   //Applet button component

                    Button daynite = new Button("Day/Night");

                   public void init()
                   {
                       add(daynite);
                       daynite.addActionListener(this);
                   }

                   public void paint(Graphics gr)
                   {

                      if (counter% 2 == 0) 
                 
                   {
 
                      setBackground(Color.white);    // Sets applet Background to black

                      gr.setColor(blueGray);             // Sets the city skyline stroke to blueGary

                     gr.drawPolygon(city);               //  Draws out the entire skyline using the
                    
                      // coordinates in the two arrays above.

                     gr.fillPolygon(city);
                 
                   
                     // The following drawLine() methods will give the skyline 
                     // graphic a 3-D prespective

                    gr.drawLine(0,220,100,220);
                    gr.drawLine(80,240,100,220);
                    gr.drawLine(100,220,100,320);
                    gr.drawLine(80,340,100,320);
                    gr.drawLine(100,320,140,320);
                    gr.drawLine(120,340,140,320);
                    gr.drawLine(120,400,140,380);

                   gr.drawLine(160,220,180,200);
                   gr.drawLine(180,200,180,340); 
                   gr.drawLine(180,340,160,360);
                   gr.drawLine(180,340,200,340);
                   gr.drawLine(200,340,180,360);
                   gr.drawLine(200,340,200,380);
                   gr.drawLine(180,400,220,360);
                   gr.drawLine(220,280,240,260);
                   gr.drawLine(240,260,300,260);
                   gr.drawLine(300,260,280,260);
                   gr.drawLine(300,260,300,340);
                   gr.drawLine(280,280,300,260);
                   gr.drawLine(300,340,280,360);
                   gr.drawLine(300,340,320,340);

                   gr.drawLine(320,300,340,280);
                   gr.drawLine(340,260,360,240);
                   gr.drawLine(360,240,400,260);
                   gr.drawLine(400,260,380,280);
                   gr.drawLine(400,260,380,280); 
                   gr.drawLine(400,260,400,360);
                   gr.drawLine(400,360,380,380);
                   gr.drawLine(400,380,420,360);
                   gr.drawLine(400,400,420,380);
                   gr.drawLine(400,360,420,360);
                 
                   gr.drawLine(420,140,440,120);
                   gr.drawLine(440,120,480,120);
                   gr.drawLine(480,120,480,280);
                   gr.drawLine(460,140,480,120);
                   gr.drawLine(460,340,480,320);
                 
                   gr.drawLine(480,280,500,260);
                   gr.drawLine(500,260,540,260);
                   gr.drawLine(540,220,560,200);
                   gr.drawLine(560,200,640,200);
                   gr.drawLine(640,200,620,220);
                   gr.drawLine(620,260,640,240);

                   gr.drawRect(560,240,40,40);
                   gr.drawLine(560,280,600,240);
                 }

                  else
                 
                 {
                    setBackground(Color.black);         // Sets applet Background to black

                    gr.setColor(blueGray);                  // Sets the city skyline stroke to blueGary

                    gr.drawPolygon(city);                   //  Draws out the entire skyline using the
                                                                      // coordinates in the two arrays above.