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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:Building the JAVAroids Game</TITLE>
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<font face="arial, helvetica" size="-1" color="#336633"><b>Black Art of Java Game Programming</b></font>
<br>
<font face="arial, helvetica" size="-1"><i>by Joel Fan</i>
<br>
Sams, Macmillan Computer Publishing
<br>
<b>ISBN:</b> 1571690433<b> Pub Date:</b> 11/01/96</font>
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<P><BR></P>
<H4 ALIGN="LEFT"><A NAME="Heading26"></A><FONT COLOR="#000077">The Effect Manager</FONT></H4>
<P>For the effect manager, we’re going to depart from our policy of avoiding object instantiations during game play. This is because the number of explosions is tricky to judge beforehand, so it’s easier to keep a Vector of explosions, and insert new explosions when the other manager classes detect collisions. Thus, EffManager provides the public methods addShipExplosion(), addEnemyExplosion(), and addAstExplosion(), which the other managers can invoke. These methods create new Explosion objects that are added to the explosions Vector.
</P>
<P>Listing 13-17 contains the complete effect manager class.</P>
<P><B>Listing 13-17</B> EffManager class</P>
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<PRE>
/////////////////////////////////////////////////////////////////
//
// EffManager: handles effects, such as explosions and sound
//
/////////////////////////////////////////////////////////////////
public class EffManager extends Object {
Vector explosions;
AudioClip expsound;
/////////////////////////////////////////////////////////////////
// EffManager constructor
/////////////////////////////////////////////////////////////////
public EffManager(AudioClip expsound) {
explosions = new Vector();
this.expsound = expsound;
}
/////////////////////////////////////////////////////////////////
// make a ship explosion at x,y
/////////////////////////////////////////////////////////////////
public void addShipExplosion(int x,int y) {
Explosion exp = new Explosion(Color.red,x,y,20);
Explosion exp1 = new Explosion(Color.yellow,x+2,y+2,25);
explosions.addElement(exp);
explosions.addElement(exp1);
if (expsound != null) {
expsound.play();
}
}
/////////////////////////////////////////////////////////////////
// make an asteroid explosion at x,y
/////////////////////////////////////////////////////////////////
public void addAstExplosion(int x,int y) {
Explosion exp = new Explosion(Color.white,x,y,15);
explosions.addElement(exp);
if (expsound != null) {
expsound.play();
}
}
/////////////////////////////////////////////////////////////////
// make an asteroid explosion at x,y
/////////////////////////////////////////////////////////////////
public void addEnemyExplosion(int x,int y) {
Explosion exp = new Explosion(Color.orange,x,y,15);
explosions.addElement(exp);
if (expsound != null) {
expsound.play();
}
}
/////////////////////////////////////////////////////////////////
// make an explosion of the given color at x,y
/////////////////////////////////////////////////////////////////
public void addExplosion(Color c,int x, int y, int u) {
Explosion exp = new Explosion(c,x,y,u);
explosions.addElement(exp);
if (expsound != null) {
expsound.play();
}
}
/////////////////////////////////////////////////////////////////
// paint the explosions by stepping through the
// explosions Vector
/////////////////////////////////////////////////////////////////
public void paint (Graphics g) {
Enumeration e;
e = explosions.elements();
while (e.hasMoreElements()) {
Sprite exp = (Sprite) e.nextElement();
exp.paint(g);
}
}
/////////////////////////////////////////////////////////////////
// update the explosions by stepping through the
// explosions Vector
/////////////////////////////////////////////////////////////////
public void update() {
Enumeration e;
e = explosions.elements();
while (e.hasMoreElements()) {
Explosion exp = (Explosion) e.nextElement();
exp.update();
// if the explosion's finished, remove it from vector
if (exp.isDone()) {
explosions.removeElement(exp);
}
}
}
}
</PRE>
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