ColorScribble.java Source code

Introduction

Here is the source code for ColorScribble.java

Source

//File: applet.html
/*
<applet code="ColorScribble.class"
   codebase="."
   width=400 height=400>
  <param name="foreground" value="FF0000">
  <param name="background" value="CCFFCC">
</applet>
    
*/

/*
 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit http://www.davidflanagan.com/javaexamples2.
 */

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

/**
 * A version of the Scribble applet that reads two applet parameters to set the
 * foreground and background colors. It also returns information about itself
 * when queried.
 */
public class ColorScribble extends Applet {
    // Read in two color parameters and set the colors.
    public void init() {
        Color foreground = getColorParameter("foreground");
        Color background = getColorParameter("background");
        if (foreground != null)
            this.setForeground(foreground);
        if (background != null)
            this.setBackground(background);
    }

    public void paint(Graphics g) {
        g.setColor(getForeground());
        g.drawString("Parameter", 10, 10);

    }

    // Read the specified parameter. Interpret it as a hexadecimal
    // number of the form RRGGBB and convert it to a color.
    protected Color getColorParameter(String name) {
        String value = this.getParameter(name);
        try {
            return new Color(Integer.parseInt(value, 16));
        } catch (Exception e) {
            return null;
        }
    }

    // Return information suitable for display in an About dialog box.
    public String getAppletInfo() {
        return "ColorScribble v. 0.03.  Written by David Flanagan.";
    }

    // Return info about the supported parameters. Web browsers and applet
    // viewers should display this information, and may also allow users to
    // set the parameter values.
    public String[][] getParameterInfo() {
        return info;
    }

    // Here's the information that getParameterInfo() returns.
    // It is an array of arrays of strings describing each parameter.
    // Format: parameter name, parameter type, parameter description
    private String[][] info = { { "foreground", "hexadecimal color value", "foreground color" },
            { "background", "hexadecimal color value", "background color" } };
}