scg/ch08/BoxParadeWithRed

01 packagepackage is used to name the directory or folder a class is in scg.ch08;
02 
03 importimport means to make the classes and/or packages available in this program fang2.core.Game;
04 importimport means to make the classes and/or packages available in this program fang2.sprites.RectangleSprite;
05 
06 importimport means to make the classes and/or packages available in this program java.awt.Color;
07 importimport means to make the classes and/or packages available in this program java.util.ArrayList;
08 
09 /**
10  * Place random boxes on screen and move them up (and loop to bottom).
11  * Mark the one closest to the top in red.
12  */
13 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 BoxParadeWithRed
14   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
15   /** index of highest box (in boxes) */
16   intint is the type for whole numbers and it is short for integer highest;
17 
18   /** original color of the highest box in boxes */
19   Color highestColor;
20 
21   /** The collection of RectangleSprites */
22   ArrayList<RectangleSprite> boxes;
23 
24   /**
25    * 10 randomly colored and placed rectangles on the screen
26    */
27   @Override
28   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
29     // Make sure you initialize the collection!
30     boxes =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor ArrayList<RectangleSprite>();
31 
32     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 i =this assignment operator makes the left side equal to the right side 0; i !=this is the not equals operator which evaluates to true if both sides are different 10; ++this is the increment operator, which increases the variable by 1i) {open braces start code blocks and must be matched with a close brace
33       RectangleSprite curr =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor RectangleSprite(0.1, 0.1);
34       curr.setLocation(randomDouble(), randomDouble());
35       curr.setColor(randomColor());
36       addSprite(curr);
37       boxes.add(curr);
38     }close braces end code blocks and must match an earlier open brace
39 
40     highest =this assignment operator makes the left side equal to the right side indexOfHighestBox();
41     highestColor =this assignment operator makes the left side equal to the right side boxes.get(highest).getColor();
42     boxes.get(highest).setColor(getColor("red"));
43   }close braces end code blocks and must match an earlier open brace
44 
45   /**
46    * Find index of "highest" box on the screen. The lower the
47    * y-coordinate, the higher the box.
48    *
49    * @returnnull  an index into boxes, the index of the highest box
50    */
51   publicpublic is used to indicate unrestricted access (any other class can have access) intint is the type for whole numbers and it is short for integer indexOfHighestBox() {open braces start code blocks and must be matched with a close brace
52     intint is the type for whole numbers and it is short for integer indexOfHighestSoFar =this assignment operator makes the left side equal to the right side 0;
53 
54     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 nextIndexToCheck =this assignment operator makes the left side equal to the right side 0; nextIndexToCheck !=this is the not equals operator which evaluates to true if both sides are different boxes.size();
55         ++this is the increment operator, which increases the variable by 1nextIndexToCheck) {open braces start code blocks and must be matched with a close brace
56       ifif executes the next statement only if the condition in parenthesis evaluates to true (boxes.get(nextIndexToCheck).getY() <
57           boxes.get(indexOfHighestSoFar).getY()) {open braces start code blocks and must be matched with a close brace
58         indexOfHighestSoFar =this assignment operator makes the left side equal to the right side nextIndexToCheck;
59       }close braces end code blocks and must match an earlier open brace
60     }close braces end code blocks and must match an earlier open brace
61 
62     returnreturn means to provide the result of the method and/or cease execution of the method immediately indexOfHighestSoFar;
63   }close braces end code blocks and must match an earlier open brace
64 
65   /**
66    * Move all the rectangles upward at a fixed speed.
67    */
68   @Override
69   publicpublic is used to indicate unrestricted access (any other class can have access) voidvoid means the method does not return a value advance(doubledouble is the type for numbers that can contain decimal fractions dT) {open braces start code blocks and must be matched with a close brace
70     intint is the type for whole numbers and it is short for integer currHighest =this assignment operator makes the left side equal to the right side indexOfHighestBox();
71 
72     ifif executes the next statement only if the condition in parenthesis evaluates to true (currHighest !=this is the not equals operator which evaluates to true if both sides are different highest) {open braces start code blocks and must be matched with a close brace
73       boxes.get(highest).setColor(highestColor);
74       highest =this assignment operator makes the left side equal to the right side currHighest;
75       highestColor =this assignment operator makes the left side equal to the right side boxes.get(highest).getColor();
76       boxes.get(highest).setColor(getColor("SCG Red"));
77     }close braces end code blocks and must match an earlier open brace
78 
79     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 i =this assignment operator makes the left side equal to the right side 0; i !=this is the not equals operator which evaluates to true if both sides are different boxes.size(); ++this is the increment operator, which increases the variable by 1i) {open braces start code blocks and must be matched with a close brace
80       boxes.get(i).translateY(-0.5 * dT);// move up
81 
82       ifif executes the next statement only if the condition in parenthesis evaluates to true (boxes.get(i).getY() < 0.0) {open braces start code blocks and must be matched with a close brace// loop around at top
83         boxes.get(i).setY(1.0);
84       }close braces end code blocks and must match an earlier open brace
85     }close braces end code blocks and must match an earlier open brace
86   }close braces end code blocks and must match an earlier open brace
87 }close braces end code blocks and must match an earlier open brace
88 
89 //Uploaded on Mon Mar 29 21:41:36 EDT 2010