968 lines
20 KiB
Java
968 lines
20 KiB
Java
//******************************************************************************
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//
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// File: Image.java
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// Package: edu.rit.draw.item
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// Unit: Class edu.rit.draw.item.Image
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.draw.item;
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import edu.rit.draw.Drawing;
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import java.awt.Graphics2D;
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import java.awt.geom.AffineTransform;
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import java.awt.image.BufferedImage;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.Externalizable;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.ObjectInput;
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import java.io.ObjectOutput;
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import javax.imageio.ImageIO;
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/**
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* Class Image provides a {@linkplain DrawingItem} containing an image. The
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* image is read from a file or input stream. Image formats supported by the
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* javax.imageio package are supported; this typically includes GIF, JPEG, and
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* PNG images.
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*
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* @author Alan Kaminsky
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* @version 23-Jun-2008
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*/
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public class Image
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extends DrawingItem
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implements Externalizable
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{
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// Exported constants.
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/**
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* The normal scale factor (1).
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*/
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public static final double NORMAL_SCALE = 1.0;
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// Hidden data members.
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private static final long serialVersionUID = 6921389113129571217L;
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// Default attributes.
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static double theDefaultScale = NORMAL_SCALE;
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// The contents of the image file stored in a byte array.
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byte[] myImageContents;
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// Buffered image read from the contents of the image file.
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BufferedImage myBufferedImage;
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// Attributes.
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double myScale = theDefaultScale;
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// Coordinates of most recently specified corner.
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double x;
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double y;
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// Factors for going from specified corner to northwest corner.
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double xFactor;
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double yFactor;
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// Size. If null, the size must be recomputed.
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Size mySize;
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// Exported constructors.
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/**
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* Construct a new image item. The image item's image is empty. The image
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* item's northwest corner is located at (0,0). The image item's attributes
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* have the default values.
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*/
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public Image()
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{
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super();
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}
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/**
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* Construct a new image item with the same image and attributes as the
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* given image item.
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*
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* @param theItem Image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>theItem</TT> is null.
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*/
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public Image
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(Image theItem)
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{
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super (theItem);
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this.myImageContents = theItem.myImageContents;
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this.myScale = theItem.myScale;
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this.x = theItem.x;
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this.y = theItem.y;
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this.xFactor = theItem.xFactor;
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this.yFactor = theItem.yFactor;
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this.mySize = theItem.mySize;
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}
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// Exported operations.
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/**
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* Returns the default scale factor. Images are displayed at a scaled size,
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* one image pixel = (scale factor) display units.
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*
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* @return Default scale factor.
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*/
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public static double defaultScale()
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{
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return theDefaultScale;
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}
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/**
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* Set the default scale factor. Images are displayed at a scaled size, one
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* image pixel = (scale factor) display units.
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*
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* @param theScale Default scale factor.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theScale</TT> is less than 0.
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*/
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public static void defaultScale
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(double theScale)
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{
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if (theScale < 0.0) throw new IllegalArgumentException();
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theDefaultScale = theScale;
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}
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/**
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* Returns this image item's image.
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*
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* @return Image.
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*/
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public BufferedImage image()
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{
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return myBufferedImage;
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}
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/**
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* Read this image item's image from the file with the given name.
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*
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* @param theFileName File name.
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*
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* @return This image item.
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*
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* @exception IOException
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* Thrown if an I/O error occurred.
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*/
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public Image image
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(String theFileName)
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throws IOException
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{
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readImageContents (new FileInputStream (theFileName));
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getBufferedImage();
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return this;
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}
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/**
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* Read this image item's image from the given file.
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*
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* @param theFile File.
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*
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* @return This image item.
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*
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* @exception IOException
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* Thrown if an I/O error occurred.
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*/
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public Image image
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(File theFile)
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throws IOException
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{
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readImageContents (new FileInputStream (theFile));
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getBufferedImage();
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return this;
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}
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/**
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* Read this image item's image from the given input stream. The entire
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* input stream is read until EOF is encountered, then the input stream is
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* closed.
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*
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* @param in Input stream.
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*
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* @return This image item.
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*
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* @exception IOException
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* Thrown if an I/O error occurred.
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*/
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public Image image
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(InputStream in)
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throws IOException
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{
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readImageContents (in);
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getBufferedImage();
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return this;
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}
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/**
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* Returns this image item's scale factor. This image is displayed at a
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* scaled size, one image pixel = (scale factor) display units.
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*
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* @return Scale factor.
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*/
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public double scale()
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{
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return myScale;
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}
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/**
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* Set this image item's scale factor. This image is displayed at a scaled
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* size, one image pixel = (scale factor) display units.
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*
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* @param theScale Scale factor.
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*
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* @return This image.
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*
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* @exception IllegalArgumentException
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* (unchecked exception) Thrown if <TT>theScale</TT> is less than 0.
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*/
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public Image scale
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(double theScale)
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{
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if (theScale < 0.0) throw new IllegalArgumentException();
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myScale = theScale;
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return this;
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}
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/**
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* Returns the width of this image item's bounding box.
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*
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* @return Width.
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*/
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public double width()
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{
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computeSize();
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return mySize.width;
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}
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/**
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* Returns the height of this image item's bounding box.
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*
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* @return Height.
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*/
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public double height()
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{
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computeSize();
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return mySize.height;
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}
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/**
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* Returns the northwest corner point of this image item's bounding box.
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*
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* @return Northwest corner point.
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*/
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public Point nw()
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{
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computeSize();
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return new Point
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(x + xFactor * mySize.width, y + yFactor * mySize.height);
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}
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/**
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* Set the northwest corner point of this image item's bounding box.
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*
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* @param x X coordinate of northwest corner point.
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* @param y Y coordinate of northwest corner point.
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*
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* @return This image item.
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*/
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public Image nw
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(double x,
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double y)
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{
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doNw (x, y);
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return this;
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}
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/**
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* Set the northwest corner point of this image item's bounding box.
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*
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* @param thePoint Northwest corner point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image nw
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(Point thePoint)
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{
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doNw (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the north middle point of this image item's bounding box.
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*
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* @param x X coordinate of north middle point.
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* @param y Y coordinate of north middle point.
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*
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* @return This image item.
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*/
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public Image n
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(double x,
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double y)
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{
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doN (x, y);
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return this;
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}
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/**
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* Set the north middle point of this image item's bounding box.
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*
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* @param thePoint North middle point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image n
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(Point thePoint)
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{
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doN (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the northeast corner point of this image item's bounding box.
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*
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* @param x X coordinate of northeast corner point.
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* @param y Y coordinate of northeast corner point.
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*
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* @return This image item.
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*/
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public Image ne
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(double x,
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double y)
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{
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doNe (x, y);
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return this;
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}
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/**
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* Set the northeast corner point of this image item's bounding box.
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*
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* @param thePoint Northeast corner point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image ne
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(Point thePoint)
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{
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doNe (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the west middle point of this image item's bounding box.
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*
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* @param x X coordinate of west middle point.
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* @param y Y coordinate of west middle point.
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*
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* @return This image item.
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*/
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public Image w
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(double x,
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double y)
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{
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doW (x, y);
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return this;
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}
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/**
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* Set the west middle point of this image item's bounding box.
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*
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* @param thePoint West middle point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image w
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(Point thePoint)
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{
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doW (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the center point of this image item's bounding box.
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*
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* @param x X coordinate of center point.
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* @param y Y coordinate of center point.
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*
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* @return This image item.
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*/
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public Image c
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(double x,
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double y)
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{
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doC (x, y);
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return this;
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}
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/**
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* Set the center point of this image item's bounding box.
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*
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* @param thePoint Center point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image c
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(Point thePoint)
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{
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doC (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the east middle point of this image item's bounding box.
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*
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* @param x X coordinate of east middle point.
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* @param y Y coordinate of east middle point.
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*
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* @return This image item.
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*/
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public Image e
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(double x,
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double y)
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{
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doE (x, y);
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return this;
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}
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/**
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* Set the east middle point of this image item's bounding box.
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*
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* @param thePoint East middle point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image e
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(Point thePoint)
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{
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doE (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the southwest corner point of this image item's bounding box.
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*
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* @param x X coordinate of southwest corner point.
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* @param y Y coordinate of southwest corner point.
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*
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* @return This image item.
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*/
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public Image sw
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(double x,
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double y)
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{
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doSw (x, y);
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return this;
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}
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/**
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* Set the southwest corner point of this image item's bounding box.
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*
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* @param thePoint Southwest corner point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image sw
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(Point thePoint)
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{
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doSw (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the south middle point of this image item's bounding box.
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*
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* @param x X coordinate of south middle point.
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* @param y Y coordinate of south middle point.
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*
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* @return This image item.
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*/
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public Image s
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(double x,
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double y)
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{
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doS (x, y);
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return this;
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}
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/**
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* Set the south middle point of this image item's bounding box.
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*
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* @param thePoint South middle point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image s
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(Point thePoint)
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{
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doS (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Set the southeast corner point of this image item's bounding box.
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*
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* @param x X coordinate of southeast corner point.
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* @param y Y coordinate of southeast corner point.
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*
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* @return This image item.
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*/
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public Image se
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(double x,
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double y)
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{
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doSe (x, y);
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return this;
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}
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/**
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* Set the southeast corner point of this image item's bounding box.
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*
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* @param thePoint Southeast corner point.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if <TT>thePoint</TT> is null.
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*/
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public Image se
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(Point thePoint)
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{
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doSe (thePoint.x, thePoint.y);
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return this;
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}
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/**
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* Add this image item to the end of the default drawing's sequence of
|
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* drawing items.
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*
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* @return This image item.
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*
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* @exception NullPointerException
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* (unchecked exception) Thrown if there is no default drawing.
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*
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* @see Drawing#defaultDrawing()
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*/
|
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public Image add()
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{
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doAdd (Drawing.defaultDrawing());
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return this;
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}
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|
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/**
|
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* Add this image item to the end of the given drawing's sequence of drawing
|
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* items.
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*
|
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* @param theDrawing Drawing.
|
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*
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* @return This image item.
|
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*
|
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* @exception NullPointerException
|
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* (unchecked exception) Thrown if <TT>theDrawing</TT> is null.
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*/
|
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public Image add
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(Drawing theDrawing)
|
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{
|
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doAdd (theDrawing);
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return this;
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}
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|
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/**
|
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* Add this image item to the beginning of the default drawing's sequence
|
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* of drawing items.
|
|
*
|
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* @return This image item.
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*
|
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* @exception NullPointerException
|
|
* (unchecked exception) Thrown if there is no default drawing.
|
|
*
|
|
* @see Drawing#defaultDrawing()
|
|
*/
|
|
public Image addFirst()
|
|
{
|
|
doAddFirst (Drawing.defaultDrawing());
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Add this image item to the beginning of the given drawing's sequence of
|
|
* drawing items.
|
|
*
|
|
* @param theDrawing Drawing.
|
|
*
|
|
* @return This image item.
|
|
*
|
|
* @exception NullPointerException
|
|
* (unchecked exception) Thrown if <TT>theDrawing</TT> is null.
|
|
*/
|
|
public Image addFirst
|
|
(Drawing theDrawing)
|
|
{
|
|
doAddFirst (theDrawing);
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Write this image item to the given object output stream.
|
|
*
|
|
* @param out Object output stream.
|
|
*
|
|
* @exception IOException
|
|
* Thrown if an I/O error occurred.
|
|
*/
|
|
public void writeExternal
|
|
(ObjectOutput out)
|
|
throws IOException
|
|
{
|
|
super.writeExternal (out);
|
|
out.writeInt (myImageContents.length);
|
|
out.write (myImageContents);
|
|
out.writeDouble (myScale);
|
|
out.writeDouble (x);
|
|
out.writeDouble (y);
|
|
out.writeDouble (xFactor);
|
|
out.writeDouble (yFactor);
|
|
out.writeObject (mySize);
|
|
}
|
|
|
|
/**
|
|
* Read this image item from the given object input stream.
|
|
*
|
|
* @param in Object input stream.
|
|
*
|
|
* @exception IOException
|
|
* Thrown if an I/O error occurred.
|
|
* @exception ClassNotFoundException
|
|
* Thrown if any class needed to deserialize this image item cannot be
|
|
* found.
|
|
*/
|
|
public void readExternal
|
|
(ObjectInput in)
|
|
throws IOException, ClassNotFoundException
|
|
{
|
|
super.readExternal (in);
|
|
int n = in.readInt();
|
|
myImageContents = new byte [n];
|
|
in.readFully (myImageContents);
|
|
getBufferedImage();
|
|
myScale = in.readDouble();
|
|
x = in.readDouble();
|
|
y = in.readDouble();
|
|
xFactor = in.readDouble();
|
|
yFactor = in.readDouble();
|
|
mySize = (Size) in.readObject();
|
|
}
|
|
|
|
/**
|
|
* Draw this image item in the given graphics context. This method is
|
|
* allowed to change the graphics context's paint, stroke, and transform,
|
|
* and it doesn't have to change them back.
|
|
*
|
|
* @param g2d 2-D graphics context.
|
|
*/
|
|
public void draw
|
|
(Graphics2D g2d)
|
|
{
|
|
super.draw (g2d);
|
|
|
|
// Determine northwest corner point.
|
|
computeSize();
|
|
double nw_x = x + xFactor * mySize.width();
|
|
double nw_y = y + yFactor * mySize.height();
|
|
|
|
// Set up drawing transform.
|
|
AffineTransform transform = new AffineTransform();
|
|
transform.translate (nw_x, nw_y);
|
|
transform.scale (myScale, myScale);
|
|
transform.translate
|
|
(- myBufferedImage.getMinX(),
|
|
- myBufferedImage.getMinY());
|
|
|
|
// Draw image.
|
|
g2d.drawRenderedImage (myBufferedImage, transform);
|
|
}
|
|
|
|
// Hidden operations.
|
|
|
|
/**
|
|
* Read the given input stream and store its contents in the field
|
|
* <TT>myImageContents</TT>. The entire input stream is read until EOF is
|
|
* encountered, then the input stream is closed.
|
|
*
|
|
* @param in Input stream from which to read the image.
|
|
*
|
|
* @exception IOException
|
|
* Thrown if an I/O error occurred.
|
|
*/
|
|
private void readImageContents
|
|
(InputStream in)
|
|
throws IOException
|
|
{
|
|
try
|
|
{
|
|
int b;
|
|
BufferedInputStream bis = new BufferedInputStream (in);
|
|
ByteArrayOutputStream baos = new ByteArrayOutputStream();
|
|
while ((b = bis.read()) != -1)
|
|
{
|
|
baos.write (b);
|
|
}
|
|
myImageContents = baos.toByteArray();
|
|
myBufferedImage = null;
|
|
mySize = null;
|
|
}
|
|
finally
|
|
{
|
|
try { in.close(); } catch (IOException exc2) {}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a buffered image from the bytes stored in the field
|
|
* <TT>myImageContents</TT>, and store the buffered image in the field
|
|
* <TT>myBufferedImage</TT>.
|
|
*
|
|
* @exception IOException
|
|
* Thrown if an I/O error occurred.
|
|
*/
|
|
private void getBufferedImage()
|
|
throws IOException
|
|
{
|
|
try
|
|
{
|
|
myBufferedImage =
|
|
ImageIO.read (new ByteArrayInputStream (myImageContents));
|
|
mySize = null;
|
|
}
|
|
catch (IOException exc)
|
|
{
|
|
myImageContents = null;
|
|
myBufferedImage = null;
|
|
mySize = null;
|
|
throw exc;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compute the size of this image item's bounding box. The result is stored
|
|
* in mySize.
|
|
*/
|
|
void computeSize()
|
|
{
|
|
if (mySize != null)
|
|
{
|
|
}
|
|
else if (myBufferedImage != null)
|
|
{
|
|
mySize =
|
|
new Size
|
|
(myScale * myBufferedImage.getWidth(),
|
|
myScale * myBufferedImage.getHeight());
|
|
}
|
|
else
|
|
{
|
|
mySize = new Size (0.0, 0.0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set the northwest corner point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of northwest corner point.
|
|
* @param y Y coordinate of northwest corner point.
|
|
*/
|
|
void doNw
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = 0.0;
|
|
this.yFactor = 0.0;
|
|
}
|
|
|
|
/**
|
|
* Set the north middle point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of north middle point.
|
|
* @param y Y coordinate of north middle point.
|
|
*/
|
|
void doN
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -0.5;
|
|
this.yFactor = 0.0;
|
|
}
|
|
|
|
/**
|
|
* Set the northeast corner point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of northeast corner point.
|
|
* @param y Y coordinate of northeast corner point.
|
|
*/
|
|
void doNe
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -1.0;
|
|
this.yFactor = 0.0;
|
|
}
|
|
|
|
/**
|
|
* Set the west middle point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of west middle point.
|
|
* @param y Y coordinate of west middle point.
|
|
*/
|
|
void doW
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = 0.0;
|
|
this.yFactor = -0.5;
|
|
}
|
|
|
|
/**
|
|
* Set the center point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of center point.
|
|
* @param y Y coordinate of center point.
|
|
*/
|
|
void doC
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -0.5;
|
|
this.yFactor = -0.5;
|
|
}
|
|
|
|
/**
|
|
* Set the east middle point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of east middle point.
|
|
* @param y Y coordinate of east middle point.
|
|
*/
|
|
void doE
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -1.0;
|
|
this.yFactor = -0.5;
|
|
}
|
|
|
|
/**
|
|
* Set the southwest corner point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of southwest corner point.
|
|
* @param y Y coordinate of southwest corner point.
|
|
*/
|
|
void doSw
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = 0.0;
|
|
this.yFactor = -1.0;
|
|
}
|
|
|
|
/**
|
|
* Set the south middle point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of south middle point.
|
|
* @param y Y coordinate of south middle point.
|
|
*/
|
|
void doS
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -0.5;
|
|
this.yFactor = -1.0;
|
|
}
|
|
|
|
/**
|
|
* Set the southeast corner point of this image item's bounding box.
|
|
*
|
|
* @param x X coordinate of southeast corner point.
|
|
* @param y Y coordinate of southeast corner point.
|
|
*/
|
|
void doSe
|
|
(double x,
|
|
double y)
|
|
{
|
|
this.x = x;
|
|
this.y = y;
|
|
this.xFactor = -1.0;
|
|
this.yFactor = -1.0;
|
|
}
|
|
|
|
}
|