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.print;

import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import java.lang.annotation.Native;

/**
 * The <code>PageFormat</code> class describes the size and
 * orientation of a page to be printed.
 */
public class PageFormat implements Cloneable
{

 /* Class Constants */

    /**
     *  The origin is at the bottom left of the paper with
     *  x running bottom to top and y running left to right.
     *  Note that this is not the Macintosh landscape but
     *  is the Window's and PostScript landscape.
     */
    @Native public static final int LANDSCAPE = 0;

    /**
     *  The origin is at the top left of the paper with
     *  x running to the right and y running down the
     *  paper.
     */
    @Native public static final int PORTRAIT = 1;

    /**
     *  The origin is at the top right of the paper with x
     *  running top to bottom and y running right to left.
     *  Note that this is the Macintosh landscape.
     */
    @Native public static final int REVERSE_LANDSCAPE = 2;

 /* Instance Variables */

    /**
     * A description of the physical piece of paper.
     */
    private Paper mPaper;

    /**
     * The orientation of the current page. This will be
     * one of the constants: PORTRIAT, LANDSCAPE, or
     * REVERSE_LANDSCAPE,
     */
    private int mOrientation = PORTRAIT;

 /* Constructors */

    /**
     * Creates a default, portrait-oriented
     * <code>PageFormat</code>.
     */
    public PageFormat()
    {
        mPaper = new Paper();
    }

 /* Instance Methods */

    /**
     * Makes a copy of this <code>PageFormat</code> with the same
     * contents as this <code>PageFormat</code>.
     * @return a copy of this <code>PageFormat</code>.
     */
    public Object clone() {
        PageFormat newPage;

        try {
            newPage = (PageFormat) super.clone();
            newPage.mPaper = (Paper)mPaper.clone();

        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            newPage = null;     // should never happen.
        }

        return newPage;
    }


    /**
     * Returns the width, in 1/72nds of an inch, of the page.
     * This method takes into account the orientation of the
     * page when determining the width.
     * @return the width of the page.
     */
    public double getWidth() {
        double width;
        int orientation = getOrientation();

        if (orientation == PORTRAIT) {
            width = mPaper.getWidth();
        } else {
            width = mPaper.getHeight();
        }

        return width;
    }

    /**
     * Returns the height, in 1/72nds of an inch, of the page.
     * This method takes into account the orientation of the
     * page when determining the height.
     * @return the height of the page.
     */
    public double getHeight() {
        double height;
        int orientation = getOrientation();

        if (orientation == PORTRAIT) {
            height = mPaper.getHeight();
        } else {
            height = mPaper.getWidth();
        }

        return height;
    }

    /**
     * Returns the x coordinate of the upper left point of the
     * imageable area of the <code>Paper</code> object
     * associated with this <code>PageFormat</code>.
     * This method takes into account the
     * orientation of the page.
     * @return the x coordinate of the upper left point of the
     * imageable area of the <code>Paper</code> object
     * associated with this <code>PageFormat</code>.
     */
    public double getImageableX() {
        double x;

        switch (getOrientation()) {

        case LANDSCAPE:
            x = mPaper.getHeight()
                - (mPaper.getImageableY() + mPaper.getImageableHeight());
            break;

        case PORTRAIT:
            x = mPaper.getImageableX();
            break;

        case REVERSE_LANDSCAPE:
            x = mPaper.getImageableY();
            break;

        default:
            /* This should never happen since it signifies that the
             * PageFormat is in an invalid orientation.
             */
            throw new InternalError("unrecognized orientation");

        }

        return x;
    }

    /**
     * Returns the y coordinate of the upper left point of the
     * imageable area of the <code>Paper</code> object
     * associated with this <code>PageFormat</code>.
     * This method takes into account the
     * orientation of the page.
     * @return the y coordinate of the upper left point of the
     * imageable area of the <code>Paper</code> object
     * associated with this <code>PageFormat</code>.
     */
    public double getImageableY() {
        double y;

        switch (getOrientation()) {

        case LANDSCAPE:
            y = mPaper.getImageableX();
            break;

        case PORTRAIT:
            y = mPaper.getImageableY();
            break;

        case REVERSE_LANDSCAPE:
            y = mPaper.getWidth()
                - (mPaper.getImageableX() + mPaper.getImageableWidth());
            break;

        default:
            /* This should never happen since it signifies that the
             * PageFormat is in an invalid orientation.
             */
            throw new InternalError("unrecognized orientation");

        }

        return y;
    }

    /**
     * Returns the width, in 1/72nds of an inch, of the imageable
     * area of the page. This method takes into account the orientation
     * of the page.
     * @return the width of the page.
     */
    public double getImageableWidth() {
        double width;

        if (getOrientation() == PORTRAIT) {
            width = mPaper.getImageableWidth();
        } else {
            width = mPaper.getImageableHeight();
        }

        return width;
    }

    /**
     * Return the height, in 1/72nds of an inch, of the imageable
     * area of the page. This method takes into account the orientation
     * of the page.
     * @return the height of the page.
     */
    public double getImageableHeight() {
        double height;

        if (getOrientation() == PORTRAIT) {
            height = mPaper.getImageableHeight();
        } else {
            height = mPaper.getImageableWidth();
        }

        return height;
    }


    /**
     * Returns a copy of the {@link Paper} object associated
     * with this <code>PageFormat</code>.  Changes made to the
     * <code>Paper</code> object returned from this method do not
     * affect the <code>Paper</code> object of this
     * <code>PageFormat</code>.  To update the <code>Paper</code>
     * object of this <code>PageFormat</code>, create a new
     * <code>Paper</code> object and set it into this
     * <code>PageFormat</code> by using the {@link #setPaper(Paper)}
     * method.
     * @return a copy of the <code>Paper</code> object associated
     *          with this <code>PageFormat</code>.
     * @see #setPaper
     */
    public Paper getPaper() {
        return (Paper)mPaper.clone();
    }

    /**
     * Sets the <code>Paper</code> object for this
     * <code>PageFormat</code>.
     * @param paper the <code>Paper</code> object to which to set
     * the <code>Paper</code> object for this <code>PageFormat</code>.
     * @exception NullPointerException
     *              a null paper instance was passed as a parameter.
     * @see #getPaper
     */
     public void setPaper(Paper paper) {
         mPaper = (Paper)paper.clone();
     }

    /**
     * Sets the page orientation. <code>orientation</code> must be
     * one of the constants: PORTRAIT, LANDSCAPE,
     * or REVERSE_LANDSCAPE.
     * @param orientation the new orientation for the page
     * @throws IllegalArgumentException if
     *          an unknown orientation was requested
     * @see #getOrientation
     */
    public void setOrientation(int orientation) throws IllegalArgumentException
    {
        if (0 <= orientation && orientation <= REVERSE_LANDSCAPE) {
            mOrientation = orientation;
        } else {
            throw new IllegalArgumentException();
        }
    }

    /**
     * Returns the orientation of this <code>PageFormat</code>.
     * @return this <code>PageFormat</code> object's orientation.
     * @see #setOrientation
     */
    public int getOrientation() {
        return mOrientation;
    }

    /**
     * Returns a transformation matrix that translates user
     * space rendering to the requested orientation
     * of the page.  The values are placed into the
     * array as

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