jpmtest.java

java高级使用教程 全书一共分六章

// JPMTest - test program for the ACME Java pixmap utilities
//
// Copyright (C) 1996 by Jef Poskanzer <[e-mail]>.  All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/

package Acme.JPM;

import java.awt.*;
import java.io.*;
import Acme.JPM.Filters.*;
import Acme.JPM.Encoders.*;
import Acme.Widgets.*;

/// Test program for the ACME Java pixmap utilities.
// <P>
// <A HREF="/resources/classes/Acme/JPM/JPMTest.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>

public class JPMTest extends Frame
    {

    private static JPMTest jpmTest;

    public static void main( String[] args )
	{
	if ( args.length != 1 )
	    {
	    System.err.println( "usage: JPMTest [filename]" );
	    System.exit( 1 );
	    }
	jpmTest = new JPMTest( args[0] );
	}


    private ImageLabel origImageLabel, filt1ImageLabel, filt2ImageLabel;
    private Image origImage, filt1Image, filt2Image;
    private Choice filt1Choice, filt2Choice, outputChoice;

    /// Constructor.
    public JPMTest( String fileName )
	{

	setTitle( "JPMTest" );

	GridBagLayout gb = new GridBagLayout();
	setLayout( gb );
	GridBagConstraints gbc = new GridBagConstraints();
	gbc.gridwidth = GridBagConstraints.REMAINDER;
	gbc.insets = new Insets( 5, 5, 5, 5 );

	Panel panel = new Panel();
	GridBagLayout gb2 = new GridBagLayout();
	panel.setLayout( gb2 );
	GridBagConstraints gbc2 = new GridBagConstraints();
	gbc2.insets = new Insets( 5, 5, 5, 5 );

	Label label = new Label( fileName );
	gbc2.gridwidth = 1;
	gb2.setConstraints( label, gbc2 );
	panel.add( label );

	filt1Choice = new Choice();
	addChoiceItems( filt1Choice );
	gbc2.gridwidth = 1;
	gb2.setConstraints( filt1Choice, gbc2 );
	panel.add( filt1Choice );

	filt2Choice = new Choice();
	addChoiceItems( filt2Choice );
	gbc2.gridwidth = GridBagConstraints.REMAINDER;
	gb2.setConstraints( filt2Choice, gbc2 );
	panel.add( filt2Choice );

	origImageLabel = new ImageLabel( Acme.GuiUtils.brokenIcon( this ) );
	gbc2.gridwidth = 1;
	gb2.setConstraints( origImageLabel, gbc2 );
	panel.add( origImageLabel );

	filt1ImageLabel = new ImageLabel( Acme.GuiUtils.brokenIcon( this ) );
	gbc2.gridwidth = 1;
	gb2.setConstraints( filt1ImageLabel, gbc2 );
	panel.add( filt1ImageLabel );

	filt2ImageLabel = new ImageLabel( Acme.GuiUtils.brokenIcon( this ) );
	gbc2.gridwidth = GridBagConstraints.REMAINDER;
	gb2.setConstraints( filt2ImageLabel, gbc2 );
	panel.add( filt2ImageLabel );

	gb.setConstraints( panel, gbc );
	add( panel );

	panel = new Panel();
	gb2 = new GridBagLayout();
	panel.setLayout( gb2 );

	outputChoice = new Choice();
	outputChoice.addItem( "GIF" );
	outputChoice.addItem( "PPM" );
	gbc2.gridwidth = 1;
	gb2.setConstraints( outputChoice, gbc2 );
	panel.add( outputChoice );

	Button button = new Button( "Write" );
	gbc2.gridwidth = 1;
	gb2.setConstraints( button, gbc2 );
	panel.add( button );

	button = new Button( "Quit" );
	gbc2.gridwidth = GridBagConstraints.REMAINDER;
	gb2.setConstraints( button, gbc2 );
	panel.add( button );

	gb.setConstraints( panel, gbc );
	add( panel );

	pack();
	validate();
	show();

	origImage = getToolkit().getImage( fileName );
	origImageLabel.setImage( origImage );
	filt1Choice.select( NONE );
	filt2Choice.select( NONE );
	filter1();
	filter2();
	}
    
    private void addChoiceItems( Choice choice )
	{
	// These items must match the order of the enumeration.
	choice.addItem( "NONE" );
	choice.addItem( "Shrink 2" );
	choice.addItem( "Enlarge 2" );
	choice.addItem( "ScaleCopy 0.51" );
	choice.addItem( "ScaleCopy 1.99" );
	choice.addItem( "Oil" );
	choice.addItem( "Smooth 2" );
	choice.addItem( "EdgeDetect" );
	choice.addItem( "Gamma 2" );
	choice.addItem( "Tile 400" );
	choice.addItem( "Flip -lr" );
	choice.addItem( "Flip -tb" );
	choice.addItem( "Flip -cw" );
	choice.addItem( "Invert" );
	choice.addItem( "Margin" );
	choice.addItem( "Shear 30" );
	choice.addItem( "Rotate 30" );
	}


    /// Event handler.
    public boolean handleEvent( Event evt )
	{
	switch ( evt.id )
	    {
	    case Event.ACTION_EVENT:
	    if ( evt.arg.equals( "Quit" ) )
		System.exit( 0 );
	    else if ( evt.arg.equals( "Write" ) )
		write();
	    else if ( evt.target == filt1Choice )
		{
		filter1();
		filter2();
		}
	    else if ( evt.target == filt2Choice )
		filter2();
	    break;
	    }
	return super.handleEvent( evt );
	}


    // This must match the order of the choice items.
    private static final int GIF = 0;
    private static final int PPM = 1;

    private void write()
	{
	try
	    {
	    ImageEncoder encoder = null;
	    switch ( outputChoice.getSelectedIndex() )
		{
		case GIF:
		encoder = new GifEncoder( filt2Image.getSource(), System.out );
		break;
		case PPM:
		encoder = new PpmEncoder( filt2Image.getSource(), System.out );
		break;
		}
	    encoder.encode();
	    }
	catch ( IOException e )
	    {
	    System.err.println( e.toString() );
	    }
	}

    // This must match the order of the choice items.
    private static final int NONE = 0;
    private static final int SHRINK2 = 1;
    private static final int ENLARGE2 = 2;
    private static final int SCALE051 = 3;
    private static final int SCALE199 = 4;
    private static final int OIL = 5;
    private static final int SMOOTH2 = 6;
    private static final int EDGEDETECT = 7;
    private static final int GAMMA2 = 8;
    private static final int TILE400 = 9;
    private static final int FLIPLR = 10;
    private static final int FLIPTB = 11;
    private static final int FLIPCW = 12;
    private static final int INVERT = 13;
    private static final int MARGIN = 14;
    private static final int SHEAR30 = 15;
    private static final int ROTATE30 = 16;

    private void filter1()
	{
	filt1Image = filterImage( filt1Choice.getSelectedIndex(), origImage );
	filt1ImageLabel.setImage( filt1Image );
	}
    
    private void filter2()
	{
	filt2Image = filterImage( filt2Choice.getSelectedIndex(), filt1Image );
	filt2ImageLabel.setImage( filt2Image );
	}
    
    private Image filterImage( int which, Image image )
	{
	switch ( which )
	    {
	    case NONE:
	    return image;
	    case SHRINK2:
	    return JPMUtils.filterImage(
		this, new Shrink( image.getSource(), 2 ) );
	    case ENLARGE2:
	    return JPMUtils.filterImage(
		this, new Enlarge( image.getSource(), 2 ) );
	    case SCALE051:
	    return JPMUtils.filterImage(
		this, new ScaleCopy( image.getSource(), 0.51 ) );
	    case SCALE199:
	    return JPMUtils.filterImage(
		this, new ScaleCopy( image.getSource(), 1.99 ) );
	    case OIL:
	    return JPMUtils.filterImage(
		this, new Oil( image.getSource() ) );
	    case SMOOTH2:
	    return JPMUtils.filterImage(
		this, new Smooth( image.getSource(), 2 ) );
	    case EDGEDETECT:
	    return JPMUtils.filterImage(
		this, new EdgeDetect( image.getSource() ) );
	    case GAMMA2:
	    return JPMUtils.filterImage(
		this, new Gamma( image.getSource(), 2.0 ) );
	    case TILE400:
	    return JPMUtils.filterImage(
		this, new Tile( image.getSource(), 400, 400 ) );
	    case FLIPLR:
	    return JPMUtils.filterImage(
		this, new Flip( image.getSource(), Flip.FLIP_LR ) );
	    case FLIPTB:
	    return JPMUtils.filterImage(
		this, new Flip( image.getSource(), Flip.FLIP_TB ) );
	    case FLIPCW:
	    return JPMUtils.filterImage(
		this, new Flip( image.getSource(), Flip.FLIP_CW ) );
	    case INVERT:
	    return JPMUtils.filterImage(
		this, new Invert( image.getSource() ) );
	    case MARGIN:
	    return JPMUtils.filterImage(
		this, new Margin( image.getSource(), Color.black, 10 ) );
	    case SHEAR30:
	    return JPMUtils.filterImage(
		this, new Shear( image.getSource(), 30.0 ) );
	    case ROTATE30:
	    return JPMUtils.filterImage(
		this, new Rotate( image.getSource(), 30.0 ) );
	    }
	return null;
	}

    }