Jka: /* TwoDimensionalPoint.java */

2007-03-30T15:00:19Z

TwoDimensionalPoint.java

Jka at 14:59, 30 March 2007

2007-03-30T14:59:21Z

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==Background==
In this assignment you will perform calculations with points in a 2-dimensional plane,
which are defined by their x- and y-coordinates. The notation for a point will be P(x,y).
The operations that you will be writing include the comparison of 2 points, the
calculation of distance between 2 points, the angle defined by the straight line through 2
points, and the slope of the line that passes through two points. Finally, you will also
evaluate whether 3 points are aligned on the same line.
==TwoDimensionalPoint.java==
<pre>
import java.lang.*;
public class TwoDimensionalPoint {
private int x;
private int y;

public TwoDimensionalPoint(int x, int y) {
this.x = x;
this.y = y;
}

public TwoDimensionalPoint() {
this.x = 0;
this.y = 0;
}

public int getX() {
return x;
}

public int getY() {
return y;
}

public void setLocation(int x, int y) {
this.x = x;
this.y = y;
}

public boolean equals(TwoDimensionalPoint rn) {
boolean result = false;
if((this.getX() == rn.getX()) && (this.getY() == rn.getY()))
{
result = true;
}
return result;
}

public void error(String msg) {
System.out.println(msg);
}

public double perform(String operation, TwoDimensionalPoint rn) {
double result = 0;
if (operation.toLowerCase() == "slope")
{
result = this.slope(rn);
}
else if (operation.toLowerCase() == "distance")
{
result = this.distance(rn);
}
else if (operation.toLowerCase() == "angle")
{
result = this.angle(rn);
}
else
{
error("You must choose one of these three operations: slop, distance, angle");
}
return result;
}
public double xDistance(TwoDimensionalPoint p)
{
double distance = Math.abs(this.getX() - p.getX());
return distance;
}
public double yDistance(TwoDimensionalPoint p)
{
double distance = Math.abs(this.getY() - p.getY());
return distance;
}
public double distance(TwoDimensionalPoint p)
{
// double distance = Math.sqrt(((this.getY() - p.getY())^2) +
// ((this.getX() - p.getX())^2));
double X = this.xDistance(p);
double Y = this.yDistance(p);
double distance = Math.sqrt(((X * X) + (Y * Y)));
return distance;
}
public double slope(TwoDimensionalPoint p)
{
/* System.out.println(this.getX());
* System.out.println(this.getY());
* System.out.println(p.getX());
* System.out.println(p.getY());
* */
double slope = Math.abs(this.yDistance(p)/this.xDistance(p));
//slope = Math.abs(((p.getY() - this.getY()) / (p.getX() - this.getX())));
return slope;
}

public boolean areAligned(TwoDimensionalPoint p1, TwoDimensionalPoint p2)
{
boolean result = false;
if((this.slope(p1)==p2.slope(this)) && (this.slope(p1)==p2.slope(p1)))
{
result = true;
}
return result;
}

public double angle(TwoDimensionalPoint p)
{
double angle = Math.atan((this.yDistance(p)) / (this.xDistance(p)));
angle = ((180 * angle) / Math.PI);
return angle;
}

public String toString()
{
String point = new String();
point = "(" + this.getX() + ", " + this.getY() + ")";
return point;
}
}
</pre>

@@ Line 122: / Line 122: @@
      point = "(" + this.getX() + ", " + this.getY() + ")";
      return point;
+   }
+}
 </pre>

CIS 3020 Project 3 - Revision history

Jka: /* TwoDimensionalPoint.java */

Jka at 14:59, 30 March 2007