JDK8/Java8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.
*
* 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>Rectangle2D</code> class describes a rectangle
* defined by a location {@code (x,y)} and dimension
* {@code (w x h)}.
* <p>
* This class is only the abstract superclass for all objects that
* store a 2D rectangle.
* The actual storage representation of the coordinates is left to
* the subclass.
*
* @author Jim Graham
* @since 1.2
*/
public abstract class Rectangle2D extends RectangularShape {
/**
* The bitmask that indicates that a point lies to the left of
* this <code>Rectangle2D</code>.
* @since 1.2
*/
public static final int OUT_LEFT = 1;
/**
* The bitmask that indicates that a point lies above
* this <code>Rectangle2D</code>.
* @since 1.2
*/
public static final int OUT_TOP = 2;
/**
* The bitmask that indicates that a point lies to the right of
* this <code>Rectangle2D</code>.
* @since 1.2
*/
public static final int OUT_RIGHT = 4;
/**
* The bitmask that indicates that a point lies below
* this <code>Rectangle2D</code>.
* @since 1.2
*/
public static final int OUT_BOTTOM = 8;
/**
* The <code>Float</code> class defines a rectangle specified in float
* coordinates.
* @since 1.2
*/
public static class Float extends Rectangle2D implements Serializable {
/**
* The X coordinate of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public float x;
/**
* The Y coordinate of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public float y;
/**
* The width of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public float width;
/**
* The height of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public float height;
/**
* Constructs a new <code>Rectangle2D</code>, initialized to
* location (0.0, 0.0) and size (0.0, 0.0).
* @since 1.2
*/
public Float() {
}
/**
* Constructs and initializes a <code>Rectangle2D</code>
* from the specified <code>float</code> coordinates.
*
* @param x the X coordinate of the upper-left corner
* of the newly constructed <code>Rectangle2D</code>
* @param y the Y coordinate of the upper-left corner
* of the newly constructed <code>Rectangle2D</code>
* @param w the width of the newly constructed
* <code>Rectangle2D</code>
* @param h the height of the newly constructed
* <code>Rectangle2D</code>
* @since 1.2
*/
public Float(float x, float y, float w, float h) {
setRect(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 <= 0.0f) || (height <= 0.0f);
}
/**
* Sets the location and size of this <code>Rectangle2D</code>
* to the specified <code>float</code> values.
*
* @param x the X coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param y the Y coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param w the width of this <code>Rectangle2D</code>
* @param h the height of this <code>Rectangle2D</code>
* @since 1.2
*/
public void setRect(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 setRect(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 void setRect(Rectangle2D r) {
this.x = (float) r.getX();
this.y = (float) r.getY();
this.width = (float) r.getWidth();
this.height = (float) r.getHeight();
}
/**
* {@inheritDoc}
* @since 1.2
*/
public int outcode(double x, double y) {
/*
* Note on casts to double below. If the arithmetic of
* x+w or y+h is done in float, then some bits may be
* lost if the binary exponents of x/y and w/h are not
* similar. By converting to double before the addition
* we force the addition to be carried out in double to
* avoid rounding error in the comparison.
*
* See bug 4320890 for problems that this inaccuracy causes.
*/
int out = 0;
if (this.width <= 0) {
out |= OUT_LEFT | OUT_RIGHT;
} else if (x < this.x) {
out |= OUT_LEFT;
} else if (x > this.x + (double) this.width) {
out |= OUT_RIGHT;
}
if (this.height <= 0) {
out |= OUT_TOP | OUT_BOTTOM;
} else if (y < this.y) {
out |= OUT_TOP;
} else if (y > this.y + (double) this.height) {
out |= OUT_BOTTOM;
}
return out;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Float(x, y, width, height);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D createIntersection(Rectangle2D r) {
Rectangle2D dest;
if (r instanceof Float) {
dest = new Rectangle2D.Float();
} else {
dest = new Rectangle2D.Double();
}
Rectangle2D.intersect(this, r, dest);
return dest;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D createUnion(Rectangle2D r) {
Rectangle2D dest;
if (r instanceof Float) {
dest = new Rectangle2D.Float();
} else {
dest = new Rectangle2D.Double();
}
Rectangle2D.union(this, r, dest);
return dest;
}
/**
* Returns the <code>String</code> representation of this
* <code>Rectangle2D</code>.
* @return a <code>String</code> representing this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public String toString() {
return getClass().getName()
+ "[x=" + x +
",y=" + y +
",w=" + width +
",h=" + height + "]";
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = 3798716824173675777L;
}
/**
* The <code>Double</code> class defines a rectangle specified in
* double coordinates.
* @since 1.2
*/
public static class Double extends Rectangle2D implements Serializable {
/**
* The X coordinate of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public double x;
/**
* The Y coordinate of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public double y;
/**
* The width of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public double width;
/**
* The height of this <code>Rectangle2D</code>.
* @since 1.2
* @serial
*/
public double height;
/**
* Constructs a new <code>Rectangle2D</code>, initialized to
* location (0, 0) and size (0, 0).
* @since 1.2
*/
public Double() {
}
/**
* Constructs and initializes a <code>Rectangle2D</code>
* from the specified <code>double</code> coordinates.
*
* @param x the X coordinate of the upper-left corner
* of the newly constructed <code>Rectangle2D</code>
* @param y the Y coordinate of the upper-left corner
* of the newly constructed <code>Rectangle2D</code>
* @param w the width of the newly constructed
* <code>Rectangle2D</code>
* @param h the height of the newly constructed
* <code>Rectangle2D</code>
* @since 1.2
*/
public Double(double x, double y, double w, double h) {
setRect(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 setRect(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 void setRect(Rectangle2D r) {
this.x = r.getX();
this.y = r.getY();
this.width = r.getWidth();
this.height = r.getHeight();
}
/**
* {@inheritDoc}
* @since 1.2
*/
public int outcode(double x, double y) {
int out = 0;
if (this.width <= 0) {
out |= OUT_LEFT | OUT_RIGHT;
} else if (x < this.x) {
out |= OUT_LEFT;
} else if (x > this.x + this.width) {
out |= OUT_RIGHT;
}
if (this.height <= 0) {
out |= OUT_TOP | OUT_BOTTOM;
} else if (y < this.y) {
out |= OUT_TOP;
} else if (y > this.y + this.height) {
out |= OUT_BOTTOM;
}
return out;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return new Double(x, y, width, height);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D createIntersection(Rectangle2D r) {
Rectangle2D dest = new Rectangle2D.Double();
Rectangle2D.intersect(this, r, dest);
return dest;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D createUnion(Rectangle2D r) {
Rectangle2D dest = new Rectangle2D.Double();
Rectangle2D.union(this, r, dest);
return dest;
}
/**
* Returns the <code>String</code> representation of this
* <code>Rectangle2D</code>.
* @return a <code>String</code> representing this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public String toString() {
return getClass().getName()
+ "[x=" + x +
",y=" + y +
",w=" + width +
",h=" + height + "]";
}
/*
* JDK 1.6 serialVersionUID
*/
private static final long serialVersionUID = 7771313791441850493L;
}
/**
* 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.Rectangle2D.Float
* @see java.awt.geom.Rectangle2D.Double
* @see java.awt.Rectangle
* @since 1.2
*/
protected Rectangle2D() {
}
/**
* Sets the location and size of this <code>Rectangle2D</code>
* to the specified <code>double</code> values.
*
* @param x the X coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param y the Y coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param w the width of this <code>Rectangle2D</code>
* @param h the height of this <code>Rectangle2D</code>
* @since 1.2
*/
public abstract void setRect(double x, double y, double w, double h);
/**
* Sets this <code>Rectangle2D</code> to be the same as the specified
* <code>Rectangle2D</code>.
* @param r the specified <code>Rectangle2D</code>
* @since 1.2
*/
public void setRect(Rectangle2D r) {
setRect(r.getX(), r.getY(), r.getWidth(), r.getHeight());
}
/**
* Tests if the specified line segment intersects the interior of this
* <code>Rectangle2D</code>.
*
* @param x1 the X coordinate of the start point of the specified
* line segment
* @param y1 the Y coordinate of the start point of the specified
* line segment
* @param x2 the X coordinate of the end point of the specified
* line segment
* @param y2 the Y coordinate of the end point of the specified
* line segment
* @return <code>true</code> if the specified line segment intersects
* the interior of this <code>Rectangle2D</code>; <code>false</code>
* otherwise.
* @since 1.2
*/
public boolean intersectsLine(double x1, double y1, double x2, double y2) {
int out1, out2;
if ((out2 = outcode(x2, y2)) == 0) {
return true;
}
while ((out1 = outcode(x1, y1)) != 0) {
if ((out1 & out2) != 0) {
return false;
}
if ((out1 & (OUT_LEFT | OUT_RIGHT)) != 0) {
double x = getX();
if ((out1 & OUT_RIGHT) != 0) {
x += getWidth();
}
y1 = y1 + (x - x1) * (y2 - y1) / (x2 - x1);
x1 = x;
} else {
double y = getY();
if ((out1 & OUT_BOTTOM) != 0) {
y += getHeight();
}
x1 = x1 + (y - y1) * (x2 - x1) / (y2 - y1);
y1 = y;
}
}
return true;
}
/**
* Tests if the specified line segment intersects the interior of this
* <code>Rectangle2D</code>.
* @param l the specified {@link Line2D} to test for intersection
* with the interior of this <code>Rectangle2D</code>
* @return <code>true</code> if the specified <code>Line2D</code>
* intersects the interior of this <code>Rectangle2D</code>;
* <code>false</code> otherwise.
* @since 1.2
*/
public boolean intersectsLine(Line2D l) {
return intersectsLine(l.getX1(), l.getY1(), l.getX2(), l.getY2());
}
/**
* Determines where the specified coordinates lie with respect
* to this <code>Rectangle2D</code>.
* This method computes a binary OR of the appropriate mask values
* indicating, for each side of this <code>Rectangle2D</code>,
* whether or not the specified coordinates are on the same side
* of the edge as the rest of this <code>Rectangle2D</code>.
* @param x the specified X coordinate
* @param y the specified Y coordinate
* @return the logical OR of all appropriate out codes.
* @see #OUT_LEFT
* @see #OUT_TOP
* @see #OUT_RIGHT
* @see #OUT_BOTTOM
* @since 1.2
*/
public abstract int outcode(double x, double y);
/**
* Determines where the specified {@link Point2D} lies with
* respect to this <code>Rectangle2D</code>.
* This method computes a binary OR of the appropriate mask values
* indicating, for each side of this <code>Rectangle2D</code>,
* whether or not the specified <code>Point2D</code> is on the same
* side of the edge as the rest of this <code>Rectangle2D</code>.
* @param p the specified <code>Point2D</code>
* @return the logical OR of all appropriate out codes.
* @see #OUT_LEFT
* @see #OUT_TOP
* @see #OUT_RIGHT
* @see #OUT_BOTTOM
* @since 1.2
*/
public int outcode(Point2D p) {
return outcode(p.getX(), p.getY());
}
/**
* Sets the location and size of the outer bounds of this
* <code>Rectangle2D</code> to the specified rectangular values.
*
* @param x the X coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param y the Y coordinate of the upper-left corner
* of this <code>Rectangle2D</code>
* @param w the width of this <code>Rectangle2D</code>
* @param h the height of this <code>Rectangle2D</code>
* @since 1.2
*/
public void setFrame(double x, double y, double w, double h) {
setRect(x, y, w, h);
}
/**
* {@inheritDoc}
* @since 1.2
*/
public Rectangle2D getBounds2D() {
return (Rectangle2D) clone();
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y) {
double x0 = getX();
double y0 = getY();
return (x >= x0 &&
y >= y0 &&
x < x0 + getWidth() &&
y < y0 + getHeight());
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean intersects(double x, double y, double w, double h) {
if (isEmpty() || w <= 0 || h <= 0) {
return false;
}
double x0 = getX();
double y0 = getY();
return (x + w > x0 &&
y + h > y0 &&
x < x0 + getWidth() &&
y < y0 + getHeight());
}
/**
* {@inheritDoc}
* @since 1.2
*/
public boolean contains(double x, double y, double w, double h) {
if (isEmpty() || w <= 0 || h <= 0) {
return false;
}
double x0 = getX();
double y0 = getY();
return (x >= x0 &&
y >= y0 &&
(x + w) <= x0 + getWidth() &&
(y + h) <= y0 + getHeight());
}
/**
* Returns a new <code>Rectangle2D</code> object representing the
* intersection of this <code>Rectangle2D</code> with the specified
* <code>Rectangle2D</code>.
* @param r the <code>Rectangle2D</code> to be intersected with
* this <code>Rectangle2D</code>
* @return the largest <code>Rectangle2D</code> contained in both
* the specified <code>Rectangle2D</code> and in this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public abstract Rectangle2D createIntersection(Rectangle2D r);
/**
* Intersects the pair of specified source <code>Rectangle2D</code>
* objects and puts the result into the specified destination
* <code>Rectangle2D</code> object. One of the source rectangles
* can also be the destination to avoid creating a third Rectangle2D
* object, but in this case the original points of this source
* rectangle will be overwritten by this method.
* @param src1 the first of a pair of <code>Rectangle2D</code>
* objects to be intersected with each other
* @param src2 the second of a pair of <code>Rectangle2D</code>
* objects to be intersected with each other
* @param dest the <code>Rectangle2D</code> that holds the
* results of the intersection of <code>src1</code> and
* <code>src2</code>
* @since 1.2
*/
public static void intersect(Rectangle2D src1,
Rectangle2D src2,
Rectangle2D dest) {
double x1 = Math.max(src1.getMinX(), src2.getMinX());
double y1 = Math.max(src1.getMinY(), src2.getMinY());
double x2 = Math.min(src1.getMaxX(), src2.getMaxX());
double y2 = Math.min(src1.getMaxY(), src2.getMaxY());
dest.setFrame(x1, y1, x2-x1, y2-y1);
}
/**
* Returns a new <code>Rectangle2D</code> object representing the
* union of this <code>Rectangle2D</code> with the specified
* <code>Rectangle2D</code>.
* @param r the <code>Rectangle2D</code> to be combined with
* this <code>Rectangle2D</code>
* @return the smallest <code>Rectangle2D</code> containing both
* the specified <code>Rectangle2D</code> and this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public abstract Rectangle2D createUnion(Rectangle2D r);
/**
* Unions the pair of source <code>Rectangle2D</code> objects
* and puts the result into the specified destination
* <code>Rectangle2D</code> object. One of the source rectangles
* can also be the destination to avoid creating a third Rectangle2D
* object, but in this case the original points of this source
* rectangle will be overwritten by this method.
* @param src1 the first of a pair of <code>Rectangle2D</code>
* objects to be combined with each other
* @param src2 the second of a pair of <code>Rectangle2D</code>
* objects to be combined with each other
* @param dest the <code>Rectangle2D</code> that holds the
* results of the union of <code>src1</code> and
* <code>src2</code>
* @since 1.2
*/
public static void union(Rectangle2D src1,
Rectangle2D src2,
Rectangle2D dest) {
double x1 = Math.min(src1.getMinX(), src2.getMinX());
double y1 = Math.min(src1.getMinY(), src2.getMinY());
double x2 = Math.max(src1.getMaxX(), src2.getMaxX());
double y2 = Math.max(src1.getMaxY(), src2.getMaxY());
dest.setFrameFromDiagonal(x1, y1, x2, y2);
}
/**
* Adds a point, specified by the double precision arguments
* <code>newx</code> and <code>newy</code>, to this
* <code>Rectangle2D</code>. The resulting <code>Rectangle2D</code>
* is the smallest <code>Rectangle2D</code> that
* contains both the original <code>Rectangle2D</code> and the
* specified point.
* <p>
* After adding a point, a call to <code>contains</code> with the
* added point as an argument does not necessarily return
* <code>true</code>. The <code>contains</code> method does not
* return <code>true</code> for points on the right or bottom
* edges of a rectangle. Therefore, if the added point falls on
* the left or bottom edge of the enlarged rectangle,
* <code>contains</code> returns <code>false</code> for that point.
* @param newx the X coordinate of the new point
* @param newy the Y coordinate of the new point
* @since 1.2
*/
public void add(double newx, double newy) {
double x1 = Math.min(getMinX(), newx);
double x2 = Math.max(getMaxX(), newx);
double y1 = Math.min(getMinY(), newy);
double y2 = Math.max(getMaxY(), newy);
setRect(x1, y1, x2 - x1, y2 - y1);
}
/**
* Adds the <code>Point2D</code> object <code>pt</code> to this
* <code>Rectangle2D</code>.
* The resulting <code>Rectangle2D</code> is the smallest
* <code>Rectangle2D</code> that contains both the original
* <code>Rectangle2D</code> and the specified <code>Point2D</code>.
* <p>
* After adding a point, a call to <code>contains</code> with the
* added point as an argument does not necessarily return
* <code>true</code>. The <code>contains</code>
* method does not return <code>true</code> for points on the right
* or bottom edges of a rectangle. Therefore, if the added point falls
* on the left or bottom edge of the enlarged rectangle,
* <code>contains</code> returns <code>false</code> for that point.
* @param pt the new <code>Point2D</code> to add to this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public void add(Point2D pt) {
add(pt.getX(), pt.getY());
}
/**
* Adds a <code>Rectangle2D</code> object to this
* <code>Rectangle2D</code>. The resulting <code>Rectangle2D</code>
* is the union of the two <code>Rectangle2D</code> objects.
* @param r the <code>Rectangle2D</code> to add to this
* <code>Rectangle2D</code>.
* @since 1.2
*/
public void add(Rectangle2D r) {
double x1 = Math.min(getMinX(), r.getMinX());
double x2 = Math.max(getMaxX(), r.getMaxX());
double y1 = Math.min(getMinY(), r.getMinY());
double y2 = Math.max(getMaxY(), r.getMaxY());
setRect(x1, y1, x2 - x1, y2 - y1);
}
/**
* Returns an iteration object that defines the boundary of this
* <code>Rectangle2D</code>.
* The iterator for this class is multi-threaded safe, which means
* that this <code>Rectangle2D</code> class guarantees that
* modifications to the geometry of this <code>Rectangle2D</code>
* object do not affect any iterations of that geometry that
* are already in process.
* @param at an optional <code>AffineTransform</code> to be applied to
* the coordinates as they are returned in the iteration, or
* <code>null</code> if untransformed coordinates are desired
* @return the <code>PathIterator</code> object that returns the
* geometry of the outline of this
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