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Complete listings of the code discussed in this module are provided in Listing 10 and Listing 11 .
| Listing 10 . Source code for the program named Slick0200. |
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/*Slick0200.java
Copyright 2013, R.G.BaldwinThis program shows a baseball coach being attacked by a
swarm of vicious ladybugs.This program uses the class named Sprite01 to populate
the game window with 1000 ladybug sprites in differentcolors with different sizes that fly around the game
window in different directions with different speeds.Tested using JDK 1.7 under WinXP
*********************************************************/import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;import org.newdawn.slick.Image;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.Color;import java.util.Random;
public class Slick0200 extends BasicGame{//Store references to Sprite01 objects here.Sprite01[] sprites = new Sprite01[1000];//Populate this with a ladybug image later.
Image image = null;//Populate these variables with the background// image along with the width and height of the
// image later.Image background = null;
float backgroundWidth;float backgroundHeight;//This object produces random float values for a
// variety of purposes.Random random = new Random();//Frame rate we would like to see and maximum frame
// rate we will allow.int targetFPS = 60;
//----------------------------------------------------//public Slick0200(){//constructor
//Set the titlesuper("Slick0200, baldwin");
}//end constructor//----------------------------------------------------//
public static void main(String[]args)
throws SlickException{AppGameContainer app = new AppGameContainer(
new Slick0200(),414,307,false);app.start();
}//end main//----------------------------------------------------//
@Overridepublic void init(GameContainer gc)
throws SlickException {//Create and save the background image object. Also
// compute and save the width and height of the image.background = new Image("background.jpg");
backgroundWidth = background.getWidth();backgroundHeight = background.getHeight();
//Create and save an Image object of a ladybug. The// sprites will wear this image
image = new Image("ladybug.png");//Populate the array with references to objects of
// the Sprite01 class.for(int cnt = 0;cnt<sprites.length;cnt++){
sprites[cnt]= new Sprite01(
image,//ladybug imagebackgroundWidth/2.0f,//initial position
backgroundHeight/2.0f,//initial position(random.nextFloat()>0.5) ? 1f : -1f,//direction
(random.nextFloat()>0.5) ? 1f : -1f,//direction
0.1f+random.nextFloat()*2.0f,//step size0.1f+random.nextFloat()*2.0f,//step size
random.nextFloat()*0.15f,//scalenew Color(random.nextFloat(),//color filter
random.nextFloat(),random.nextFloat()));
}//end for loopgc.setTargetFrameRate(targetFPS);//set frame rate
}//end init//----------------------------------------------------//
@Overridepublic void update(GameContainer gc, int delta)
throws SlickException{//Do the following for every sprite in the array
for(int cnt = 0;cnt<sprites.length;cnt++){
//Ask each sprite to move.sprites[cnt].move();//Ask each sprite to bounce off the edge if
// necessary.sprites[cnt].edgeBounce(backgroundWidth,backgroundHeight);
}//end for loop}//end update
//----------------------------------------------------//public void render(GameContainer gc, Graphics g)
throws SlickException{//set the drawing mode to honor transparent pixels
g.setDrawMode(g.MODE_NORMAL);//Draw the background to erase the previous picture.
background.draw(0,0);//Draw every sprite in the array.
for(int cnt = 0;cnt<sprites.length;cnt++){
//Ask the sprite to draw itself.sprites[cnt].draw();}//end for loop
}//end render}//end class Slick0200
//======================================================// |
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