JDK14/Java14源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package java.awt.geom;
import java.io.Serializable;
/**
* The {@code Ellipse2D} class describes an ellipse that is defined
* by a framing rectangle.
* <p>
* This class is only the abstract superclass for all objects which
* store a 2D ellipse.
* The actual storage representation of the coordinates is left to
* the subclass.
*
* @author Jim Graham
* @since 1.2
*/
public abstract class Ellipse2D extends RectangularShape {
/**
* The {@code Float} class defines an ellipse specified
* in {@code float} precision.
* @since 1.2
*/
public static class Float extends Ellipse2D implements Serializable {
/**
* The X coordinate of the upper-left corner of the
* framing rectangle of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public float x;
/**
* The Y coordinate of the upper-left corner of the
* framing rectangle of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public float y;
/**
* The overall width of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public float width;
/**
* The overall height of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public float height;
/**
* Constructs a new {@code Ellipse2D}, initialized to
* location (0, 0) and size (0, 0).
* @since 1.2
*/
public Float() {
}
/**
* Constructs and initializes an {@code Ellipse2D} from the
* specified coordinates.
*
* @param x the X coordinate of the upper-left corner
* of the framing rectangle
* @param y the Y coordinate of the upper-left corner
* of the framing rectangle
* @param w the width of the framing rectangle
* @param h the height of the framing rectangle
* @since 1.2
*/
public Float(float x, float y, float w, float h) {
setFrame(x, y, w, h);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getX() {
return (double) x;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getY() {
return (double) y;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getWidth() {
return (double) width;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getHeight() {
return (double) height;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean isEmpty() {
return (width <= 0.0 || height <= 0.0);
}
/**
* Sets the location and size of the framing rectangle of this
* {@code Shape} to the specified rectangular values.
*
* @param x the X coordinate of the upper-left corner of the
* specified rectangular shape
* @param y the Y coordinate of the upper-left corner of the
* specified rectangular shape
* @param w the width of the specified rectangular shape
* @param h the height of the specified rectangular shape
* @since 1.2
*/
public void setFrame(float x, float y, float w, float h) {
this.x = x;
this.y = y;
this.width = w;
this.height = h;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setFrame(double x, double y, double w, double h) {
this.x = (float) x;
this.y = (float) y;
this.width = (float) w;
this.height = (float) h;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Rectangle2D.Float(x, y, width, height);
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = -6633761252372475977L;
}
/**
* The {@code Double} class defines an ellipse specified
* in {@code double} precision.
* @since 1.2
*/
public static class Double extends Ellipse2D implements Serializable {
/**
* The X coordinate of the upper-left corner of the
* framing rectangle of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public double x;
/**
* The Y coordinate of the upper-left corner of the
* framing rectangle of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public double y;
/**
* The overall width of this {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public double width;
/**
* The overall height of the {@code Ellipse2D}.
* @since 1.2
* @serial
*/
public double height;
/**
* Constructs a new {@code Ellipse2D}, initialized to
* location (0, 0) and size (0, 0).
* @since 1.2
*/
public Double() {
}
/**
* Constructs and initializes an {@code Ellipse2D} from the
* specified coordinates.
*
* @param x the X coordinate of the upper-left corner
* of the framing rectangle
* @param y the Y coordinate of the upper-left corner
* of the framing rectangle
* @param w the width of the framing rectangle
* @param h the height of the framing rectangle
* @since 1.2
*/
public Double(double x, double y, double w, double h) {
setFrame(x, y, w, h);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getX() {
return x;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getY() {
return y;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getWidth() {
return width;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getHeight() {
return height;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean isEmpty() {
return (width <= 0.0 || height <= 0.0);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setFrame(double x, double y, double w, double h) {
this.x = x;
this.y = y;
this.width = w;
this.height = h;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Rectangle2D.Double(x, y, width, height);
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = 5555464816372320683L;
}
/**
* This is an abstract class that cannot be instantiated directly.
* Type-specific implementation subclasses are available for
* instantiation and provide a number of formats for storing
* the information necessary to satisfy the various accessor
* methods below.
*
* @see java.awt.geom.Ellipse2D.Float
* @see java.awt.geom.Ellipse2D.Double
* @since 1.2
*/
protected Ellipse2D() {
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y) {
// Normalize the coordinates compared to the ellipse
// having a center at 0,0 and a radius of 0.5.
double ellw = getWidth();
if (ellw <= 0.0) {
return false;
}
double normx = (x - getX()) / ellw - 0.5;
double ellh = getHeight();
if (ellh <= 0.0) {
return false;
}
double normy = (y - getY()) / ellh - 0.5;
return (normx * normx + normy * normy) < 0.25;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean intersects(double x, double y, double w, double h) {
if (w <= 0.0 || h <= 0.0) {
return false;
}
// Normalize the rectangular coordinates compared to the ellipse
// having a center at 0,0 and a radius of 0.5.
double ellw = getWidth();
if (ellw <= 0.0) {
return false;
}
double normx0 = (x - getX()) / ellw - 0.5;
double normx1 = normx0 + w / ellw;
double ellh = getHeight();
if (ellh <= 0.0) {
return false;
}
double normy0 = (y - getY()) / ellh - 0.5;
double normy1 = normy0 + h / ellh;
// find nearest x (left edge, right edge, 0.0)
// find nearest y (top edge, bottom edge, 0.0)
// if nearest x,y is inside circle of radius 0.5, then intersects
double nearx, neary;
if (normx0 > 0.0) {
// center to left of X extents
nearx = normx0;
} else if (normx1 < 0.0) {
// center to right of X extents
nearx = normx1;
} else {
nearx = 0.0;
}
if (normy0 > 0.0) {
// center above Y extents
neary = normy0;
} else if (normy1 < 0.0) {
// center below Y extents
neary = normy1;
} else {
neary = 0.0;
}
return (nearx * nearx + neary * neary) < 0.25;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y, double w, double h) {
return (contains(x, y) &&
contains(x + w, y) &&
contains(x, y + h) &&
contains(x + w, y + h));
}
/**
* Returns an iteration object that defines the boundary of this
* {@code Ellipse2D}.
* The iterator for this class is multi-threaded safe, which means
* that this {@code Ellipse2D} class guarantees that
* modifications to the geometry of this {@code Ellipse2D}
* object do not affect any iterations of that geometry that
* are already in process.
* @param at an optional {@code AffineTransform} to be applied to
* the coordinates as they are returned in the iteration, or
* {@code null} if untransformed coordinates are desired
* @return the {@code PathIterator} object that returns the
* geometry of the outline of this {@code Ellipse2D},
* one segment at a time.
* @since 1.2
*/
public PathIterator getPathIterator(AffineTransform at) {
return new EllipseIterator(this, at);
}
/**
* Returns the hashcode for this {@code Ellipse2D}.
* @return the hashcode for this {@code Ellipse2D}.
* @since 1.6
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