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Below are the code fragments referenced by the reading quiz.

Walker

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// This class represents a walker with two feet.
 
import java.awt.Image;
import java.awt.Graphics;
 
public class Walker
{
	public static final int PIXELS_PER_INCH = 6;
	private Foot leftFoot, rightFoot;
	private int stepLength;
	private int stepsCount;
 
	// Constructor
	public Walker (int x, int y, Image leftPic, Image rightPic)
	{ . . . }
 
	// Returns the left foot
	public Foot getLeftFoot ()
	{ . . . }
 
	// Returns the right foot
	public Foot getRightFoot ()
	{ . . . }
 
	// Makes first step, starting with the left foot
	public void firstStep ()
	{ . . . }
 
	// Makes next step
	public void nextStep ()
	{ . . . }
 
	// Stops this walker (brings its feet together)
	public void stop ()
	{ . . . }
 
	// Returns the distance walked
	public int distanceTraveled ()
	{ . . . }
 
	// Draws this walker
	public void draw (Graphics g)
	{ . . . }
}

Pacer

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// A subclass of Walker that adds the turnAround method.
 
import java.awt.Image;
 
public class Pacer extends Walker
{
	// Constructor
	public Pacer (int x, int y, Image leftPic, Image rightPic)
	{ . . . }
 
	// Turns this Pacer 180 degrees
	// Precondition: the left and right feet are side by side
	public void turnAround ()
	{ . . . }
 
	public void turnRight ()
	{ . . . }
 
	public void turnLeft ()
	{ . . . }
}

PacerTest

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. . . imports omitted to save space . . .
 
public class PacerTest extends JPanel
{
	// Called automatically when the panel needs repainting
	public void paintComponent (Graphics g)
	{
		super.paintComponent (g);
 
		int x = 100;
		int y = 300;
 
		Pacer p = new Pacer (x, y, lshoe, rshoe);
 
		p.draw (g);
		p.firstStep ();
		p.nextStep ();
		p.stop ();
		p.turnLeft ();
		p.draw (g);
		p.firstStep ();
		p.nextStep ();
		p.stop ();
		p.turnRight ();
		p.draw (g);
 
		// Draw a cursor at the expected center of the first "shoe":
		g.drawLine (x - 50, y, x + 50, y);
		g.drawLine (x, y - 50, x, y + 50);
	}
 
	. . . other methods omitted to save space . . .
}

October 22nd, 2010

Posted In: Handouts

Tags: ,

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