point.java

来自「< BeginningJava2,JDK5> 书中所有例程源码」· Java 代码 · 共 57 行

package Geometry;
import static java.lang.Math.sqrt;

public class Point {
  // Create a point from its coordinates
  public Point(double xVal, double yVal) {
    x = xVal;
    y = yVal;
  }

  // Create a Point from an existing Point object
  public Point(final Point aPoint) {
    x = aPoint.x;
    y = aPoint.y;
  }
    // Move a point
  public void move(double xDelta, double yDelta) {
    // Parameter values are increments to the current coordinates
    x += xDelta;
    y += yDelta;
  }

  // Calculate the distance to another point
  public double distance(final Point aPoint) {
    return sqrt((x - aPoint.x)*(x - aPoint.x)+(y - aPoint.y)*(y - aPoint.y));
  }

  // Convert a point to a string 
  public String toString() {
    return Double.toString(x) + ", " + y;    // As "x, y"
  }

  // Retrieve the x coordinate
  public double getX() {
    return x;  
  }

  // Retrieve the y coordinate
  public double getY() {
    return y;  
  }

  // Set the x coordinate
  public void setX(double inputX) {
    x = inputX;  
  }

  // Set the y coordinate
  public void setY(double inputY) {
    y = inputY;  
  }

  // Coordinates of the point
  private double x;
  private double y;
}