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<META name=vsisbn content="1571690433"><META name=vstitle content="Black Art of Java Game Programming"><META name=vsauthor content="Joel Fan"><META name=vsimprint content="Sams"><META name=vspublisher content="Macmillan Computer Publishing"><META name=vspubdate content="11/01/96"><META name=vscategory content="Web and Software Development: Programming, Scripting, and Markup Languages: Java"><TITLE>Black Art of Java Game Programming:Daleks!</TITLE>
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<font face="arial, helvetica" size="-1" color="#336633"><b>Black Art of Java Game Programming</b></font>
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<font face="arial, helvetica" size="-1"><i>by Joel Fan</i>
<br>
Sams, Macmillan Computer Publishing
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<b>ISBN:</b> 1571690433<b> Pub Date:</b> 11/01/96</font>
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<H4 ALIGN="LEFT"><A NAME="Heading22"></A><FONT COLOR="#000077">Allowing Customization</FONT></H4>
<P>There are currently 10 parameters that can be specified from HTML to adjust some aspect of the game. The getHTMLParameters() method (shown in Listing 14-19) checks for each of these parameters and adjusts game variables as necessary.
</P>
<P><B>Listing 14-19</B> The daleks14.getHTMLParameters() method</P>
<!-- CODE //-->
<PRE>
public void getHTMLParameters() {
// read the parameters within the HTML applet tags
if (getParameter("maxX") != null)
maxX = Integer.parseInt(getParameter("maxX"));
if (getParameter("maxY") != null)
maxY = Integer.parseInt(getParameter("maxY"));
if (getParameter("imgH") != null)
imgH = Integer.parseInt(getParameter("imgH"));
if (getParameter("imgW") != null)
imgW = Integer.parseInt(getParameter("imgW"));
if (getParameter("levelMultiple") != null)
levelMultiple = ⇐
Integer.parseInt(getParameter("levelMultiple"));
if (getParameter("baseNum") != null)
baseNumDaleks = Integer.parseInt(getParameter("baseNum"));
if (getParameter("maxEnemies") != null)
maxEnemies = Integer.parseInt(getParameter("maxEnemies"));
if (getParameter("numWidgets") != null)
numWidgets = Integer.parseInt(getParameter("numWidgets"));
if (getParameter("flyingWidget") != null)
flyingWidget = getParameter("flyingWidget");
else
flyingWidget = "?";
if (getParameter("title") != null)
title = getParameter("title");
else
title = "Daleks!";
}
</PRE>
<!-- END CODE //-->
<P>Because we cannot assume that any <param> tags are actually contained in the HTML document, we have to first test for their existence. This is done using <I>if</I> statements. The value of the Strings will be <I>null</I> if the parameter is not included. There are two kinds of values that are contained in the <param> tags, although they all are read in as String objects. The Integer.parseInt(String) method is used to convert Strings to integers where necessary.</P>
<H3><A NAME="Heading23"></A><FONT COLOR="#000077">Suggestion Box</FONT></H3>
<DL>
<DD><B>•</B> Base animation speed on actual timing rather than a <I>for</I> loop (which allows animations to vary according to processor speed)
<DD><B>•</B> Rewrite the applet in a more object-oriented way to represent the game objects more logically, enhance reusability of the code, and allow for future customization
<DD><B>•</B> Add graphics for the actors who played the role of Dr. Who but are left out of the game in ego-crushing obscurity
<DD><B>•</B> Include additional enemies from the Dr. Who TV show and imbue them with styles of attack even more clever than that of the Daleks
<DD><B>•</B> Give the player additional options—like the ability to pick up objects that enhance the player’s abilities for a limited period of time
<DD><B>•</B> Add <<I>param</I>> tags which would rename the Sonic Screwdrivers and change how many are added each level
<DD><B>•</B> Make any fundamental changes optional so players can choose between playing the “classic” and “enhanced” versions of the game
</DL>
<H3><A NAME="Heading24"></A><FONT COLOR="#000077">Comments</FONT></H3>
<P>In this chapter we covered the essence of a Java board game with a number of additional features. The applet makes use of such fundamental Java concepts as multiple threads, double-buffered animation, and event-oriented processing. The end result is a fairly simple, but effective game which puts a minimal strain on bandwidth and processor speed. The ability to customize the appearance and game play of the applet can greatly extend its interest to players. New themes and challenges for Daleks! can be created with a minimum of development effort.
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