Computer Science 252
Problem Solving with Java

Fall 2013, The College of Saint Rose

Home     Syllabus     Schedule     Examples     Style Guide

DrawRoads Demo

A working demo of DrawRoads will appear below. Click inside the applet to interact with it.

DrawRoads BlueJ Project

Click here to download a BlueJ project for DrawRoads.

DrawRoads Source Code

The Java source code for DrawRoads is below. Click on a file name to download it.

DrawRoads.java

import objectdraw.*;
import java.awt.*;

/* $Id: DrawRoads.java 2218 2013-10-18 14:06:39Z terescoj $ */

/**
 * Example DrawRoads: draw "road segments" at mouse
 * click points.
 *
 * @author Jim Teresco
 * Siena College, CSIS 120, Spring 2011
 *
 */

public class DrawRoads extends WindowController {
    
    /** Draw a road segment at the mouse press point
     * 
     *  @param point the Location of the mouse press
     */
    public void onMousePress(Location point) {
    
        new RoadSegment(point, canvas);
    }
 }

RoadSegment.java

import objectdraw.*;
import java.awt.*;

/* $Id: RoadSegment.java 2218 2013-10-18 14:06:39Z terescoj $ */

/**
 * Class to draw a simple road segment at a given point
 * on the given canvas.
 * 
 * @author Jim Teresco
 * Siena College, CSIS 120, Spring 2011
 */

public class RoadSegment {
 
    // constant parameters defining the sizes for the road segment
    private static final double ROAD_WIDTH = 50;
    private static final double ROAD_LENGTH = 200;
    private static final double STRIPE_WIDTH = 3;
    private static final double STRIPE_LENGTH = 20;
    private static final double STRIPE_SPACING = 20;
    private static final double SIDE_STRIPE_INSET = 2;
    
    // default colors
    private static final Color ROAD_COLOR = new Color(32, 32, 32);
    private static final Color SIDE_LINE_COLOR = Color.white;
    private static final Color CENTER_LINE_COLOR = Color.yellow;
    
    /**
     * Construct a new RoadSegment
     * 
     * @param point the Location of the upper left corner of the segment
     * @param canvas the DrawingCanvas on which to draw
     */
    public RoadSegment(Location point, DrawingCanvas canvas) {
        
        // the pavement
        new FilledRect(point, ROAD_WIDTH, ROAD_LENGTH, canvas).setColor(ROAD_COLOR);
        
        // side stripes
        new FilledRect(point.getX() + SIDE_STRIPE_INSET, point.getY(),
                       STRIPE_WIDTH, ROAD_LENGTH, canvas).setColor(SIDE_LINE_COLOR);
        new FilledRect(point.getX() + ROAD_WIDTH - SIDE_STRIPE_INSET - STRIPE_WIDTH,
                       point.getY(),
                       STRIPE_WIDTH, ROAD_LENGTH, canvas).setColor(SIDE_LINE_COLOR);
                      
        // center stripes, draw from bottom to top
        double nextStripeY = point.getY() + ROAD_LENGTH - STRIPE_LENGTH;
        double stripeX = point.getX() + ROAD_WIDTH/2 - STRIPE_WIDTH/2;
        
        while (nextStripeY >= point.getY()) {
            new FilledRect(stripeX, nextStripeY, STRIPE_WIDTH, STRIPE_LENGTH, canvas).setColor(CENTER_LINE_COLOR);
            nextStripeY = nextStripeY - STRIPE_LENGTH - STRIPE_SPACING;
        }
    }
}