scg/ch09/Caterpillar

01 packagepackage is used to name the directory or folder a class is in scg.ch09;
02 
03 importimport means to make the classes and/or packages available in this program fang2.core.*;
04 importimport means to make the classes and/or packages available in this program fang2.sprites.*;
05 importimport means to make the classes and/or packages available in this program fang2.transformers.*;
06 
07 /**
08  * This is a shell of a game with a caterpillar that follows the mouse.
09  *
10  * @authorthis is the Javadoc tag for documenting who created the source code  Jam Jenkins
11  */
12 publicpublic is used to indicate unrestricted access (any other class can have access) classclass is a group of fields and methods used for making objects Caterpillar
13   extendsextends means to customize or extend the functionality of a class Game {open braces start code blocks and must be matched with a close brace
14   /** an invisible sprite the caterpillar's head follows */
15   privateprivate is used to restrict access to the current class only Sprite follow;
16 
17   /**
18    * makes the follow sprite locate where the mouse is
19    */
20   @Override
21   publicpublic is used to indicate unrestricted access (any other class can have access) voidvoid means the method does not return a value advance() {open braces start code blocks and must be matched with a close brace
22     follow.setLocation(getMouse2D());
23   }close braces end code blocks and must match an earlier open brace
24 
25   /**
26    * makes and adds the caterpillar and invisible sprite
27    */
28   @Override
29   publicpublic is used to indicate unrestricted access (any other class can have access) voidvoid means the method does not return a value setup() {open braces start code blocks and must be matched with a close brace
30     // follow is invisible because it is not added
31     follow =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor OvalSprite(0.01, 0.01);
32     follow.setColor(getColor("Yellow"));
33     follow.setLocation(0.1, 0.1);
34 
35     // the first segment tracks follow
36     Sprite previous =this assignment operator makes the left side equal to the right side follow;
37     // make 10 segments each following each other
38     forfor is a looping structure for repeatedly executing a block of code (intint is the type for whole numbers and it is short for integer k =this assignment operator makes the left side equal to the right side 0; k < 10; k++this is the increment operator, which increases the variable by 1) {open braces start code blocks and must be matched with a close brace
39       Sprite segment =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor OvalSprite(0.1, 0.1);
40       segment.setLocation(0.5 +adds two numbers together or concatenates Strings together (0.05 * k), 0.5);
41       segment.setColor(getColor("Green"));
42       AttractTransformer attractor =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor AttractTransformer(0.2);
43       attractor.setTarget(previous);
44       // make sure the segments don't get too close
45       attractor.setMinDistance(0.05);
46       segment.addTransformer(attractor);
47       addSprite(segment);
48       // the current segment should be followed next
49       previous =this assignment operator makes the left side equal to the right side segment;
50     }close braces end code blocks and must match an earlier open brace
51   }close braces end code blocks and must match an earlier open brace
52 }close braces end code blocks and must match an earlier open brace
53 
54 //Uploaded on Mon Mar 29 21:41:25 EDT 2010