Pointf.java |
package ip.graphics; import java.awt.*; /** * The <code>Pointf</code> class represents a location in a * two-dimensional (<i>x</i>, <i>y</i>) coordinate space. * * @version 1.0, 1/6/99 * @author Douglas Lyon * @since Kahindu 2.4 */ public class Pointf extends Component implements java.io.Serializable { public float x = 0f; public float y = 0f; public float dotSize = 10; /* * JDK 1.1 serialVersionUID */ private static final long serialVersionUID = -5276940640259749850L; /** * Constructs and initializes a point at the origin * (0, 0) of the coordinate space. * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. * @since Kahindu 2.4 */ public Pointf() { this(0f, 0f); } /** * Constructs and initializes a point with the same location as * the specified <code>Point</code> object. * @param p a point. * @since Kahindu 2.4 */ public Pointf(Pointf p) { this(p.x, p.y); } /** * Constructs and initializes a point at the specified * (<i>x</i>, <i>y</i>) location in the coordinate space. * @param x the <i>x</i> coordinate. * @param y the <i>y</i> coordinate. * @since Kahindu 2.4 */ public Pointf(float x, float y) { this.x = x; this.y = y; } /** * Returns the location of this point. * This method is included for completeness, to parallel the * <code>getLocation</code> method of <code>Component</code>. * @return a copy of this point, at the same location. * @see java.awt.Component#getLocation * @see java.awt.Point#setLocation(java.awt.Point) * @see java.awt.Point#setLocation(int, int) * @since Kahindu 2.4 */ public Point getLocation() { return new Point((int) x, (int) y); } /** * Sets the location of the point to the specificed location. * This method is included for completeness, to parallel the * <code>setLocation</code> method of <code>Component</code>. * @param p a point, the new location for this point. * @see java.awt.Component#setLocation(java.awt.Point) * @see java.awt.Point#getLocation * @since Kahindu 2.4 */ public void setLocation(Pointf p) { setLocation(p.x, p.y); } /** * Changes the point to have the specificed location. * <p> * This method is included for completeness, to parallel the * <code>setLocation</code> method of <code>Component</code>. * Its behavior is identical with <code>move(int, int)</code>. * @param x the <i>x</i> coordinate of the new location. * @param y the <i>y</i> coordinate of the new location. * @see java.awt.Component#setLocation(int, int) * @see java.awt.Point#getLocation * @see java.awt.Point#move(int, int) * @since Kahindu 2.4 */ public void setLocation(float x, float y) { move(x, y); } /** * Moves this point to the specificed location in the * (<i>x</i>, <i>y</i>) coordinate plane. This method * is identical with <code>setLocation(int, int)</code>. * @param x the <i>x</i> coordinate of the new location. * @param y the <i>y</i> coordinate of the new location. * @see java.awt.Component#setLocation(int, int) * @since Kahindu 2.4 */ public void move(float x, float y) { this.x = x; this.y = y; } /** * Translates this point, at location (<i>x</i>, <i>y</i>), * by <code>dx</code> along the <i>x</i> axis and <code>dy</code> * along the <i>y</i> axis so that it now represents the point * (<code>x</code> <code>+</code> <code>dx</code>, * <code>y</code> <code>+</code> <code>dy</code>). * @param dx the distance to move this point * along the <i>x</i> axis. * @param dy the distance to move this point * along the <i>y</i> axis. * @since Kahindu 2.4 */ public void translate(float x, float y) { this.x += x; this.y += y; } /** * Returns the hashcode for this point. * @return a hash code for this point. * @since Kahindu 2.4 */ public int hashCode() { return (int) x ^ ((int) y * 31); } /** * Determines whether two points are equal. Two instances of * <code>Point</code> are equal if the values of their * <code>x</code> and <code>y</code> member fields, representing * their position in the coordinate space, are the same. * @param obj an object to be compared with this point. * @return <code>true</code> if the object to be compared is * an instance of <code>Point</code> and has * the same values; <code>false</code> otherwise. * @since kahindu 2.4 */ public boolean equals(Object obj) { if (obj instanceof Pointf) { Pointf pt = (Pointf) obj; return (x == pt.x) && (y == pt.y); } return false; } /** * Returns a representation of this point and its location * in the (<i>x</i>, <i>y</i>) coordinate space as a string. * @return a string representation of this point, * including the values of its member fields. * @since kahindu 2.4 */ public String toString() { return getClass().getName() + "[x=" + x + ",y=" + y + "]"; } }