Computer Science 252
Problem Solving with Java

Fall 2015, The College of Saint Rose

MoreColorfulSpiralLines Demo

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

MoreColorfulSpiralLines BlueJ Project

Click here to download a BlueJ project for MoreColorfulSpiralLines.

MoreColorfulSpiralLines Source Code

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

import objectdraw.*;
import java.awt.*;
import java.util.Random;

 * Example MoreColorfulSpiralLines
 * Another spiral lines program.  This time it creates lines of
 * any randomly chosen color.
 * Jim Teresco, Siena College, CSIS 120, Spring 2011
 * Modified for CSC 252, The College of Saint Rose, Fall 2013, Spring 2014
 * Based on example from Williams College CSCI 134
 * $Id: 2528 2015-01-22 03:05:27Z terescoj $

public class MoreColorfulSpiralLines extends WindowController {

    // first coordinate of a line segment
    private Location linesStart;

    // color of next sprial
    private Color currentColor;

    // generator for random color values
    private Random randomIntensity = new Random();

     * Save the first coordinate of the line, and pick
     * a new color at random.
    public void onMousePress(Location point) {

        linesStart = point;

        // Create a new random color, with values from
        // 0..255 for the Red, Green, and Blue parts,
        // save in an instance variable so we can use
        // it down in onMouseDrag
        currentColor = new Color(randomIntensity.nextInt(256), 


    public void onMouseDrag(Location point) {
        new Line(linesStart, point, canvas).setColor(currentColor);

    // now also clear the canvas when we reenter the window
    public void onMouseEnter(Location pt) {