Computer Science 252
Problem Solving with Java

Spring 2015, The College of Saint Rose

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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.

MoreColorfulSpiralLines.java

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: MoreColorfulSpiralLines.java 2523 2015-01-16 21:36:54Z 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), 
            randomIntensity.nextInt(256),
            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) {
        canvas.clear();
    }
}