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Listing 15 . Source code for the program named PointLine02.
/*PointLine02.java
Copyright 2008, R.G.BaldwinThe purpose of this program is to introduce the use of a
game-math class library named GM2D01. The class nameGM2D01 is an abbreviation for GameMath2D01.
The program instantiates objects from the following statictop-level classes belonging to the class named GM2D01 and
then displays the contents of those objects in twodifferent ways on the standard output device.
ColMatrixPoint
VectorLine
Tested using JDK 1.6 under WinXP.*********************************************************/
class PointLine02{public static void main(String[] args){System.out.println(
"Instantiate and display the contents\n"+ "of a new ColMatrix object");
GM2D01.ColMatrix colMatrix =new GM2D01.ColMatrix(2.5,6.8);
System.out.println(colMatrix);try{
System.out.println(colMatrix.getData(0));System.out.println(colMatrix.getData(1));
//This statement will throw an exception on purposeSystem.out.println(colMatrix.getData(2));
}catch(Exception e){System.out.println("Bad index");
}//end catchSystem.out.println(/*blank line*/);
System.out.println("Instantiate and display the contents\n"
+ "of a new Point object");colMatrix = new GM2D01.ColMatrix(3.4,9.7);
GM2D01.Point point = new GM2D01.Point(colMatrix);System.out.println(point);
try{System.out.println(point.getData(0));
System.out.println(point.getData(1));//This statement will throw an exception on purpose
System.out.println(point.getData(-1));}catch(Exception e){
System.out.println("Bad index");}//end catchSystem.out.println(/*blank line*/);
System.out.println("Instantiate and display the contents\n"
+ "of a new Vector object");colMatrix = new GM2D01.ColMatrix(-1.9,7.5);
GM2D01.Vector vector = new GM2D01.Vector(colMatrix);System.out.println(vector);
try{System.out.println(vector.getData(0));
System.out.println(vector.getData(1));//This statement will throw an exception on purpose
System.out.println(vector.getData(2));}catch(Exception e){
System.out.println("Bad index");}//end catchSystem.out.println(/*blank line*/);
System.out.println("Instantiate and display the contents\n"
+ "of a new Line object");GM2D01.ColMatrix colMatrixTail =
new GM2D01.ColMatrix(1.1,2.2);GM2D01.ColMatrix colMatrixHead =
new GM2D01.ColMatrix(3.3,4.4);GM2D01.Point pointTail =new GM2D01.Point(colMatrixTail);
GM2D01.Point pointHead =new GM2D01.Point(colMatrixHead);GM2D01.Line line =
new GM2D01.Line(pointTail,pointHead);System.out.println(line);
pointTail = line.getTail();System.out.println(pointTail);
pointHead = line.getHead();System.out.println(pointHead);
}//end main}//end controlling class PointLine02
Listing 16 . Source code for the game-programming math library named GM2D01.
/*GM2D01.java
Copyright 2008, R.G.BaldwinThe name GM2D01 is an abbreviation for GameMath2D01.
This is a game-math class, which will be expanded overtime. The class is provided solely for educational
purposes. No effort has been expended to optimize it inany way. Rather, it was designed and implemented for
maximum clarity in order to help students understandthe programming details of various mathematical operations
commonly used in game programming.Each time the class is expanded or modified, it will be
given a new name by incrementing the two digits at theend of the name. No attempt will be made to maintain
backward compatibility from one version of the class tothe next.
This class contains a number of static top-level classes.This organizational approach was used primarily for the
purpose of gathering such classes under a single namingumbrella while avoiding name conflicts within a single
package. For example, as time passes, and this library isexpanded, my default package may contain class files with
the following names:GM2D01$Point.class
GM2D02$Point.classGM2D03$Point.class
All real-number values used in this class are maintainedas type double.
Tested using JDK 1.6 under WinXP.*********************************************************/
public class GM2D01{//An object of this class represents a 2D column matrix.
// An object of this class is the fundamental building// block for several of the other classes in the
// library.public static class ColMatrix{
double[]data = new double[2];ColMatrix(double data0,double data1){data[0] = data0;data[1] = data1;}//end constructorpublic String toString(){
return data[0]+ "," + data[1];}//end overridden toString methodpublic double getData(int index){
if((index<0) || (index>1))
throw new IndexOutOfBoundsException();return data[index];}//end getData}//end class ColMatrix
//====================================================//public static class Point{GM2D01.ColMatrix point;Point(GM2D01.ColMatrix point){
this.point = point;}//end constructorpublic String toString(){
return point.getData(0) + "," + point.getData(1);}//end toStringpublic double getData(int index){
if((index<0) || (index>1))
throw new IndexOutOfBoundsException();return point.getData(index);
}//end getData}//end class Point//====================================================//public static class Vector{
GM2D01.ColMatrix vector;Vector(GM2D01.ColMatrix vector){this.vector = vector;
}//end constructorpublic String toString(){return vector.getData(0) + "," + vector.getData(1);
}//end toStringpublic double getData(int index){if((index<0) || (index>1))
throw new IndexOutOfBoundsException();return vector.getData(index);
}//end getData}//end class Vector//====================================================////A line is defined by two points. One is called the
// tail and the other is called the head.public static class Line{
GM2D01.Point[]line = new GM2D01.Point[2];Line(GM2D01.Point tail,GM2D01.Point head){this.line[0] = tail;this.line[1] = head;}//end constructorpublic String toString(){
return "Tail = " + line[0].getData(0) + ","
+ line[0].getData(1) + "\nHead = "
+ line[1].getData(0) + ","
+ line[1].getData(1);
}//end toStringpublic GM2D01.Point getTail(){return line[0];}//end getTailpublic GM2D01.Point getHead(){
return line[1];
}//end getTail}//end class Line}//end class GM2D01
Without using the game math library, use the programming environment of your choice to write a program that drawsa diagonal line from the upper-left to the lower-right corner of a window as shown in Figure 7 .
Figure 7 Graphic output from Exercise 1.
Using Java and the game math library named GM2D01 , write a program that:
Your screen output should display numeric values in the format shown in Figure 8 where each ? character represents a single digit.
| Figure 8 . Text output from Exercise 2. |
|---|
?.?,?.?
?.??.? |
Using Java and the game math library named GM2D01 , write a program that:
Your screen output should display numeric values in the format shown in Figure 9 where each ? character represents a single digit. (Note that the number of digits to the right of the decimal point in the last line of text may be greateror less than that shown in Figure 9 .)
| Figure 9 . Text output from Exercise 3. |
|---|
Tail = ?.?,?.?
Head = ?.?,?.?Length = ?.??? |
-end-
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