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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.
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package aima.core.util.math.geom.shapes;
import aima.core.util.Util;
/**
* Simplified version of java.awt.geom.Point2D
. We do not want
* dependencies to presentation layer packages here.
*
* @author R. Lunde
* @author Mike Stampone
*/
public class Point2D implements Cloneable {
private double x;
private double y;
/**
* @param x the X coordinate of the point.
* @param y the Y coordinate of the point.
*/
public Point2D(double x, double y) {
this.x = x;
this.y = y;
}
/**
* Returns the X coordinate of this Point2D
in
* double
precision.
*
* @return the X coordinate of this Point2D
.
*/
public double getX() {
return x;
}
/**
* Returns the Y coordinate of this Point2D
in
* double
precision.
*
* @return the Y coordinate of this Point2D
.
*/
public double getY() {
return y;
}
/**
* Returns the Euclidean distance between a specified point and this point.
* @param pt the second point.
* @return the Euclidean distance between a specified point and this point.
*/
public double distance(Point2D pt) {
// Distance Between X Coordinates
final double x_distance = (pt.getX() - x) * (pt.getX() - x);
// Distance Between Y Coordinates
final double y_distance = (pt.getY()-y)*(pt.getY()-y) ;
// Distance Between 2d Points
return Math.sqrt(x_distance + y_distance) ;
}
/**
* Adds a vector onto a point.
* This moves the point by {@code vector.getX()} in X direction and {@code vector.getY()} in Y direction.
* @param op2 the {@link Vector2D} to be added.
* @return the moved point.
*/
public Point2D add(Vector2D op2) {
return new Point2D(this.x + op2.getX(), this.y + op2.getY());
}
/**
* Subtracts a vector from a point.
* This moves the point by {@code vector.getX()} in negative X direction and {@code vector.getY()} in negative Y direction.
* @param op2 the {@link Vector2D} to be subtracted.
* @return the moved point.
*/
public Point2D sub(Vector2D op2) {
return new Point2D(this.x - op2.getX(), this.y - op2.getY());
}
/**
* Calculates the vector between this point and the target point.
* @param target the point that describes the end of the vector.
* @return the vector between this point and the target point.
*/
public Vector2D vec(Point2D target) {
return new Vector2D(target.getX() - this.x, target.getY() - this.y);
}
/**
* Checks a point for equality with this point.
* @param op2 the second point.
* @return {@code true} if the points have the same coordinates.
*/
public boolean equals(Point2D op2) {
if(op2 == null) return false;
return Util.compareDoubles(this.x,op2.x) && Util.compareDoubles(this.y,op2.y);
}
@Override
public boolean equals(Object o) {
if(o instanceof Point2D)
return this.equals((Point2D) o);
return false;
}
@Override
public Point2D clone() {
return new Point2D(this.x,this.y);
}
}