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Diffstat (limited to 'src/gui/doc/snippets/separations/screenwidget.cpp')
| -rw-r--r-- | src/gui/doc/snippets/separations/screenwidget.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/gui/doc/snippets/separations/screenwidget.cpp b/src/gui/doc/snippets/separations/screenwidget.cpp new file mode 100644 index 0000000000..328b1d0624 --- /dev/null +++ b/src/gui/doc/snippets/separations/screenwidget.cpp @@ -0,0 +1,217 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * 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. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT +** OWNER 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/* +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); +} |