Logo Search packages:      
Sourcecode: qt4-x11 version File versions

screenwidget.cpp

/****************************************************************************
**
** Copyright (C) 2004-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

/*
screenwidget.cpp

A widget to display colour components from an image using independently
selected colors. Controls are provided to allow the image to be inverted, and
the color to be selection via a standard dialog. The image is displayed in a
label widget.
*/

#include <QApplication>
#include <QColorDialog>
#include <QGridLayout>
#include <QImage>
#include <QLabel>
#include <QMenu>
#include <QMimeData>
#include <QMouseEvent>
#include <QPixmap>
#include <QPushButton>
#include <QWidget>

#include "screenwidget.h"

/*!
Initializes the paint color, the mask color (cyan, magenta,
or yellow), connects the color selector and invert checkbox to functions,
and creates a two-by-two grid layout.
*/

ScreenWidget::ScreenWidget(QWidget *parent, QColor initialColor,
                           const QString &name, Separation mask,
                           const QSize &labelSize)
    : QFrame(parent)
{
    paintColor = initialColor;
    maskColor = mask;
    inverted = false;

    imageLabel = new QLabel;
    imageLabel->setFrameShadow(QFrame::Sunken);
    imageLabel->setFrameShape(QFrame::StyledPanel);
    imageLabel->setMinimumSize(labelSize);

    nameLabel = new QLabel(name);
    colorButton = new QPushButton(tr("Modify..."));
    colorButton->setBackgroundRole(QPalette::Button);
    colorButton->setMinimumSize(32, 32);

    QPalette palette(colorButton->palette());
    palette.setColor(QPalette::Button, initialColor);
    colorButton->setPalette(palette);

    invertButton = new QPushButton(tr("Invert"));
    //invertButton->setToggleButton(true);
    //invertButton->setOn(inverted);
    invertButton->setEnabled(false);

    connect(colorButton, SIGNAL(clicked()), this, SLOT(setColor()));
    connect(invertButton, SIGNAL(clicked()), this, SLOT(invertImage()));

    QGridLayout *gridLayout = new QGridLayout;
    gridLayout->addWidget(imageLabel, 0, 0, 1, 2);
    gridLayout->addWidget(nameLabel, 1, 0);
    gridLayout->addWidget(colorButton, 1, 1);
    gridLayout->addWidget(invertButton, 2, 1, 1, 1);
    setLayout(gridLayout);
}

/*!
    Creates a new image by separating out the cyan, magenta, or yellow
    component, depending on the mask color specified in the constructor.

    The amount of the component found in each pixel of the image is used
    to determine how much of a user-selected ink is used for each pixel
    in the new image for the label widget.
*/

void ScreenWidget::createImage()
{
    newImage = originalImage.copy();

    // Create CMY components for the ink being used.
    float cyanInk = (255 - paintColor.red())/255.0;
    float magentaInk = (255 - paintColor.green())/255.0;
    float yellowInk = (255 - paintColor.blue())/255.0;

    int (*convert)(QRgb);

    switch (maskColor) {
        case Cyan:
            convert = qRed;
            break;
        case Magenta:
            convert = qGreen;
            break;
        case Yellow:
            convert = qBlue;
            break;
    }

    for (int y = 0; y < newImage.height(); ++y) {
        for (int x = 0; x < newImage.width(); ++x) {
            QRgb p(originalImage.pixel(x, y));

            // Separate the source pixel into its cyan component.
            int amount;

            if (inverted)
                amount = convert(p);
            else
                amount = 255 - convert(p);

            QColor newColor(
                255 - qMin(int(amount * cyanInk), 255),
                255 - qMin(int(amount * magentaInk), 255),
                255 - qMin(int(amount * yellowInk), 255));

            newImage.setPixel(x, y, newColor.rgb());
        }
    }

    imageLabel->setPixmap(QPixmap::fromImage(newImage));
}

/*!
    Returns a pointer to the modified image.
*/

QImage* ScreenWidget::image()
{
    return &newImage;
}

/*!
    Sets whether the amount of ink applied to the canvas is to be inverted
    (subtracted from the maximum value) before the ink is applied.
*/

void ScreenWidget::invertImage()
{
    //inverted = invertButton->isOn();
    inverted = !inverted;
    createImage();
    emit imageChanged();
}

/*!
    Separate the current image into cyan, magenta, and yellow components.
    Create a representation of how each component might appear when applied
    to a blank white piece of paper.
*/

void ScreenWidget::setColor()
{
    QColor newColor = QColorDialog::getColor(paintColor);

    if (newColor.isValid()) {
        paintColor = newColor;
        QPalette palette(colorButton->palette());
        palette.setColor(QPalette::Button, paintColor);
        colorButton->setPalette(palette);
        createImage();
        emit imageChanged();
    }
}

/*!
    Records the original image selected by the user, creates a color
    separation, and enables the invert image checkbox.
*/

void ScreenWidget::setImage(QImage &image)
{
    originalImage = image;
    createImage();
    invertButton->setEnabled(true);
}

Generated by  Doxygen 1.6.0   Back to index