scg/ch05/ColoredRectangles

01 packagepackage is used to name the directory or folder a class is in scg.ch05;
02 
03 importimport means to make the classes and/or packages available in this program fang2.attributes.Location2D;
04 importimport means to make the classes and/or packages available in this program fang2.core.Game;
05 importimport means to make the classes and/or packages available in this program fang2.sprites.RectangleSprite;
06 
07 /**
08  * ColoredRectangles demonstrates how to use local variables. The classclass is a group of fields and methods used for making objects
09  * has no fields and no setup method. In advance, it checks forfor is a looping structure for repeatedly executing a block of code a mouse
10  * click and ifif executes the next statement only if the condition in parenthesis evaluates to true there is one, it creates a newnew is used to create objects by calling the constructor, randomly sized and
11  * randomly colored rectangle centered where the mouse was clicked.
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 ColoredRectangles
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   /**
16    * Check forfor is a looping structure for repeatedly executing a block of code a mouse click; ifif executes the next statement only if the condition in parenthesis evaluates to true one is clicked, make a random
17    * rectangle.
18    */
19   @Override
20   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 secondsSinceLastCall) {open braces start code blocks and must be matched with a close brace
21     Location2D mouseClick;
22     mouseClick =this assignment operator makes the left side equal to the right side getClick2D();
23 
24     ifif executes the next statement only if the condition in parenthesis evaluates to true (mouseClick !=this is the not equals operator which evaluates to true if both sides are different nullnull is the value used to refer to a non-existant object) {open braces start code blocks and must be matched with a close brace// any click at all?
25       RectangleSprite rectangle;
26       rectangle =this assignment operator makes the left side equal to the right side newnew is used to create objects by calling the constructor RectangleSprite(randomDouble(), randomDouble());
27       rectangle.setColor(randomColor());
28       rectangle.setLocation(mouseClick);
29       addSprite(rectangle);
30     }close braces end code blocks and must match an earlier open brace
31     // Is rectangle in scope?
32   }close braces end code blocks and must match an earlier open brace
33 }close braces end code blocks and must match an earlier open brace
34 
35 //Uploaded on Mon Mar 29 21:39:05 EDT 2010