Java example source code file (RoundRectangle2D.java)
The RoundRectangle2D.java Java example source code/*
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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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package java.awt.geom;
import java.io.Serializable;
/**
* The <code>RoundRectangle2D class defines a rectangle with
* rounded corners defined by a location {@code (x,y)}, a
* dimension {@code (w x h)}, and the width and height of an arc
* with which to round the corners.
* <p>
* This class is the abstract superclass for all objects that
* store a 2D rounded rectangle.
* The actual storage representation of the coordinates is left to
* the subclass.
*
* @author Jim Graham
* @since 1.2
*/
public abstract class RoundRectangle2D extends RectangularShape {
/**
* The <code>Float class defines a rectangle with rounded
* corners all specified in <code>float coordinates.
* @since 1.2
*/
public static class Float extends RoundRectangle2D
implements Serializable
{
/**
* The X coordinate of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public float x;
/**
* The Y coordinate of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public float y;
/**
* The width of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public float width;
/**
* The height of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public float height;
/**
* The width of the arc that rounds off the corners.
* @since 1.2
* @serial
*/
public float arcwidth;
/**
* The height of the arc that rounds off the corners.
* @since 1.2
* @serial
*/
public float archeight;
/**
* Constructs a new <code>RoundRectangle2D, initialized to
* location (0.0, 0.0), size (0.0, 0.0), and corner arcs
* of radius 0.0.
* @since 1.2
*/
public Float() {
}
/**
* Constructs and initializes a <code>RoundRectangle2D
* from the specified <code>float coordinates.
*
* @param x the X coordinate of the newly
* constructed <code>RoundRectangle2D
* @param y the Y coordinate of the newly
* constructed <code>RoundRectangle2D
* @param w the width to which to set the newly
* constructed <code>RoundRectangle2D
* @param h the height to which to set the newly
* constructed <code>RoundRectangle2D
* @param arcw the width of the arc to use to round off the
* corners of the newly constructed
* <code>RoundRectangle2D
* @param arch the height of the arc to use to round off the
* corners of the newly constructed
* <code>RoundRectangle2D
* @since 1.2
*/
public Float(float x, float y, float w, float h,
float arcw, float arch)
{
setRoundRect(x, y, w, h, arcw, arch);
}
/**
* {@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 double getArcWidth() {
return (double) arcwidth;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getArcHeight() {
return (double) archeight;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean isEmpty() {
return (width <= 0.0f) || (height <= 0.0f);
}
/**
* Sets the location, size, and corner radii of this
* <code>RoundRectangle2D to the specified
* <code>float values.
*
* @param x the X coordinate to which to set the
* location of this <code>RoundRectangle2D
* @param y the Y coordinate to which to set the
* location of this <code>RoundRectangle2D
* @param w the width to which to set this
* <code>RoundRectangle2D
* @param h the height to which to set this
* <code>RoundRectangle2D
* @param arcw the width to which to set the arc of this
* <code>RoundRectangle2D
* @param arch the height to which to set the arc of this
* <code>RoundRectangle2D
* @since 1.2
*/
public void setRoundRect(float x, float y, float w, float h,
float arcw, float arch)
{
this.x = x;
this.y = y;
this.width = w;
this.height = h;
this.arcwidth = arcw;
this.archeight = arch;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setRoundRect(double x, double y, double w, double h,
double arcw, double arch)
{
this.x = (float) x;
this.y = (float) y;
this.width = (float) w;
this.height = (float) h;
this.arcwidth = (float) arcw;
this.archeight = (float) arch;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setRoundRect(RoundRectangle2D rr) {
this.x = (float) rr.getX();
this.y = (float) rr.getY();
this.width = (float) rr.getWidth();
this.height = (float) rr.getHeight();
this.arcwidth = (float) rr.getArcWidth();
this.archeight = (float) rr.getArcHeight();
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Rectangle2D.Float(x, y, width, height);
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = -3423150618393866922L;
}
/**
* The <code>Double class defines a rectangle with rounded
* corners all specified in <code>double coordinates.
* @since 1.2
*/
public static class Double extends RoundRectangle2D
implements Serializable
{
/**
* The X coordinate of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public double x;
/**
* The Y coordinate of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public double y;
/**
* The width of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public double width;
/**
* The height of this <code>RoundRectangle2D.
* @since 1.2
* @serial
*/
public double height;
/**
* The width of the arc that rounds off the corners.
* @since 1.2
* @serial
*/
public double arcwidth;
/**
* The height of the arc that rounds off the corners.
* @since 1.2
* @serial
*/
public double archeight;
/**
* Constructs a new <code>RoundRectangle2D, initialized to
* location (0.0, 0.0), size (0.0, 0.0), and corner arcs
* of radius 0.0.
* @since 1.2
*/
public Double() {
}
/**
* Constructs and initializes a <code>RoundRectangle2D
* from the specified <code>double coordinates.
*
* @param x the X coordinate of the newly
* constructed <code>RoundRectangle2D
* @param y the Y coordinate of the newly
* constructed <code>RoundRectangle2D
* @param w the width to which to set the newly
* constructed <code>RoundRectangle2D
* @param h the height to which to set the newly
* constructed <code>RoundRectangle2D
* @param arcw the width of the arc to use to round off the
* corners of the newly constructed
* <code>RoundRectangle2D
* @param arch the height of the arc to use to round off the
* corners of the newly constructed
* <code>RoundRectangle2D
* @since 1.2
*/
public Double(double x, double y, double w, double h,
double arcw, double arch)
{
setRoundRect(x, y, w, h, arcw, arch);
}
/**
* {@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 double getArcWidth() {
return arcwidth;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getArcHeight() {
return archeight;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean isEmpty() {
return (width <= 0.0f) || (height <= 0.0f);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setRoundRect(double x, double y, double w, double h,
double arcw, double arch)
{
this.x = x;
this.y = y;
this.width = w;
this.height = h;
this.arcwidth = arcw;
this.archeight = arch;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setRoundRect(RoundRectangle2D rr) {
this.x = rr.getX();
this.y = rr.getY();
this.width = rr.getWidth();
this.height = rr.getHeight();
this.arcwidth = rr.getArcWidth();
this.archeight = rr.getArcHeight();
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Rectangle2D.Double(x, y, width, height);
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = 1048939333485206117L;
}
/**
* 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.RoundRectangle2D.Float
* @see java.awt.geom.RoundRectangle2D.Double
* @since 1.2
*/
protected RoundRectangle2D() {
}
/**
* Gets the width of the arc that rounds off the corners.
* @return the width of the arc that rounds off the corners
* of this <code>RoundRectangle2D.
* @since 1.2
*/
public abstract double getArcWidth();
/**
* Gets the height of the arc that rounds off the corners.
* @return the height of the arc that rounds off the corners
* of this <code>RoundRectangle2D.
* @since 1.2
*/
public abstract double getArcHeight();
/**
* Sets the location, size, and corner radii of this
* <code>RoundRectangle2D to the specified
* <code>double values.
*
* @param x the X coordinate to which to set the
* location of this <code>RoundRectangle2D
* @param y the Y coordinate to which to set the
* location of this <code>RoundRectangle2D
* @param w the width to which to set this
* <code>RoundRectangle2D
* @param h the height to which to set this
* <code>RoundRectangle2D
* @param arcWidth the width to which to set the arc of this
* <code>RoundRectangle2D
* @param arcHeight the height to which to set the arc of this
* <code>RoundRectangle2D
* @since 1.2
*/
public abstract void setRoundRect(double x, double y, double w, double h,
double arcWidth, double arcHeight);
/**
* Sets this <code>RoundRectangle2D to be the same as the
* specified <code>RoundRectangle2D.
* @param rr the specified <code>RoundRectangle2D
* @since 1.2
*/
public void setRoundRect(RoundRectangle2D rr) {
setRoundRect(rr.getX(), rr.getY(), rr.getWidth(), rr.getHeight(),
rr.getArcWidth(), rr.getArcHeight());
}
/**
* {@inheritDoc}
* @since 1.2
*/
public void setFrame(double x, double y, double w, double h) {
setRoundRect(x, y, w, h, getArcWidth(), getArcHeight());
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y) {
if (isEmpty()) {
return false;
}
double rrx0 = getX();
double rry0 = getY();
double rrx1 = rrx0 + getWidth();
double rry1 = rry0 + getHeight();
// Check for trivial rejection - point is outside bounding rectangle
if (x < rrx0 || y < rry0 || x >= rrx1 || y >= rry1) {
return false;
}
double aw = Math.min(getWidth(), Math.abs(getArcWidth())) / 2.0;
double ah = Math.min(getHeight(), Math.abs(getArcHeight())) / 2.0;
// Check which corner point is in and do circular containment
// test - otherwise simple acceptance
if (x >= (rrx0 += aw) && x < (rrx0 = rrx1 - aw)) {
return true;
}
if (y >= (rry0 += ah) && y < (rry0 = rry1 - ah)) {
return true;
}
x = (x - rrx0) / aw;
y = (y - rry0) / ah;
return (x * x + y * y <= 1.0);
}
private int classify(double coord, double left, double right,
double arcsize)
{
if (coord < left) {
return 0;
} else if (coord < left + arcsize) {
return 1;
} else if (coord < right - arcsize) {
return 2;
} else if (coord < right) {
return 3;
} else {
return 4;
}
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean intersects(double x, double y, double w, double h) {
if (isEmpty() || w <= 0 || h <= 0) {
return false;
}
double rrx0 = getX();
double rry0 = getY();
double rrx1 = rrx0 + getWidth();
double rry1 = rry0 + getHeight();
// Check for trivial rejection - bounding rectangles do not intersect
if (x + w <= rrx0 || x >= rrx1 || y + h <= rry0 || y >= rry1) {
return false;
}
double aw = Math.min(getWidth(), Math.abs(getArcWidth())) / 2.0;
double ah = Math.min(getHeight(), Math.abs(getArcHeight())) / 2.0;
int x0class = classify(x, rrx0, rrx1, aw);
int x1class = classify(x + w, rrx0, rrx1, aw);
int y0class = classify(y, rry0, rry1, ah);
int y1class = classify(y + h, rry0, rry1, ah);
// Trivially accept if any point is inside inner rectangle
if (x0class == 2 || x1class == 2 || y0class == 2 || y1class == 2) {
return true;
}
// Trivially accept if either edge spans inner rectangle
if ((x0class < 2 && x1class > 2) || (y0class < 2 && y1class > 2)) {
return true;
}
// Since neither edge spans the center, then one of the corners
// must be in one of the rounded edges. We detect this case if
// a [xy]0class is 3 or a [xy]1class is 1. One of those two cases
// must be true for each direction.
// We now find a "nearest point" to test for being inside a rounded
// corner.
x = (x1class == 1) ? (x = x + w - (rrx0 + aw)) : (x = x - (rrx1 - aw));
y = (y1class == 1) ? (y = y + h - (rry0 + ah)) : (y = y - (rry1 - ah));
x = x / aw;
y = y / ah;
return (x * x + y * y <= 1.0);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y, double w, double h) {
if (isEmpty() || w <= 0 || h <= 0) {
return false;
}
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>RoundRectangle2D.
* The iterator for this class is multi-threaded safe, which means
* that this <code>RoundRectangle2D class guarantees that
* modifications to the geometry of this <code>RoundRectangle2D
* 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>RoundRectangle2D, one segment at a time.
* @since 1.2
*/
public PathIterator getPathIterator(AffineTransform at) {
return new RoundRectIterator(this, at);
}
/**
* Returns the hashcode for this <code>RoundRectangle2D.
* @return the hashcode for this <code>RoundRectangle2D.
* @since 1.6
*/
public int hashCode() {
long bits = java.lang.Double.doubleToLongBits(getX());
bits += java.lang.Double.doubleToLongBits(getY()) * 37;
bits += java.lang.Double.doubleToLongBits(getWidth()) * 43;
bits += java.lang.Double.doubleToLongBits(getHeight()) * 47;
bits += java.lang.Double.doubleToLongBits(getArcWidth()) * 53;
bits += java.lang.Double.doubleToLongBits(getArcHeight()) * 59;
return (((int) bits) ^ ((int) (bits >> 32)));
}
/**
* Determines whether or not the specified <code>Object is
* equal to this <code>RoundRectangle2D. The specified
* <code>Object is equal to this
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