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Diffstat (limited to 'sources/pyside2/doc/codesnippets/doc/src/snippets/separations/viewer.cpp')
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1 files changed, 0 insertions, 338 deletions
diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/separations/viewer.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/separations/viewer.cpp deleted file mode 100644 index 008279c1a..000000000 --- a/sources/pyside2/doc/codesnippets/doc/src/snippets/separations/viewer.cpp +++ /dev/null @@ -1,338 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the examples of Qt for Python. -** -** $QT_BEGIN_LICENSE:BSD$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, 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 The Qt Company Ltd 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." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -/* -viewer.cpp - -Provides a main window for displaying a user-specified original image -with three color separations in a grid layout. - -A main menu provides entries for selecting files, and adjusting the -brightness of the separations. -*/ - -#include <QtWidgets> - -#include "finalwidget.h" -#include "screenwidget.h" -#include "viewer.h" - -/* - Constructor: initializes a default value for the brightness, creates - the main menu entries, and constructs a central widget that contains - enough space for images to be displayed. -*/ - -Viewer::Viewer() -{ - setWindowTitle(tr("QImage Color Separations")); - - brightness = 255; - - createMenus(); - setCentralWidget(createCentralWidget()); -} - -/* - Creates a main menu with two entries: a File menu, to allow the image - to be selected, and a Brightness menu to allow the brightness of the - separations to be changed. - - Initially, the Brightness menu items are disabled, but the first entry in - the menu is checked to reflect the default brightness. -*/ - -void Viewer::createMenus() -{ - fileMenu = new QMenu(tr("&File"), this); - brightnessMenu = new QMenu(tr("&Brightness"), this); - - QAction *openAction = fileMenu->addAction(tr("&Open...")); - openAction->setShortcut(QKeySequence("Ctrl+O")); - saveAction = fileMenu->addAction(tr("&Save...")); - saveAction->setShortcut(QKeySequence("Ctrl+S")); - saveAction->setEnabled(false); - QAction *quitAction = fileMenu->addAction(tr("E&xit")); - quitAction->setShortcut(QKeySequence("Ctrl+Q")); - - QAction *noBrightness = brightnessMenu->addAction(tr("&0%")); - noBrightness->setCheckable(true); - QAction *quarterBrightness = brightnessMenu->addAction(tr("&25%")); - quarterBrightness->setCheckable(true); - QAction *halfBrightness = brightnessMenu->addAction(tr("&50%")); - halfBrightness->setCheckable(true); - QAction *threeQuartersBrightness = brightnessMenu->addAction(tr("&75%")); - threeQuartersBrightness->setCheckable(true); - QAction *fullBrightness = brightnessMenu->addAction(tr("&100%")); - fullBrightness->setCheckable(true); - - menuMap[noBrightness] = None; - menuMap[quarterBrightness] = Quarter; - menuMap[halfBrightness] = Half; - menuMap[threeQuartersBrightness] = ThreeQuarters; - menuMap[fullBrightness] = Full; - - currentBrightness = fullBrightness; - currentBrightness->setChecked(true); - brightnessMenu->setEnabled(false); - - menuBar()->addMenu(fileMenu); - menuBar()->addMenu(brightnessMenu); - - connect(openAction, SIGNAL(triggered()), this, SLOT(chooseFile())); - connect(saveAction, SIGNAL(triggered()), this, SLOT(saveImage())); - connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit())); - connect(brightnessMenu, SIGNAL(triggered(QAction *)), this, - SLOT(setBrightness(QAction *))); -} - -/* - Constructs a central widget for the window consisting of a two-by-two - grid of labels, each of which will contain an image. We restrict the - size of the labels to 256 pixels, and ensure that the window cannot - be resized. -*/ - -QFrame* Viewer::createCentralWidget() -{ - QFrame* frame = new QFrame(this); - grid = new QGridLayout(frame); - grid->setSpacing(8); - grid->setMargin(4); - - layout()->setSizeConstraint(QLayout::SetFixedSize); - - QSize labelSize(256, 256); - - finalWidget = new FinalWidget(frame, tr("Final image"), labelSize); - - cyanWidget = new ScreenWidget(frame, Qt::cyan, tr("Cyan"), - ScreenWidget::Cyan, labelSize); - magentaWidget = new ScreenWidget(frame, Qt::magenta, tr("Magenta"), - ScreenWidget::Magenta, labelSize); - yellowWidget = new ScreenWidget(frame, Qt::yellow, tr("Yellow"), - ScreenWidget::Yellow, labelSize); - - connect(cyanWidget, SIGNAL(imageChanged()), this, SLOT(createImage())); - connect(magentaWidget, SIGNAL(imageChanged()), this, SLOT(createImage())); - connect(yellowWidget, SIGNAL(imageChanged()), this, SLOT(createImage())); - - grid->addWidget(finalWidget, 0, 0, Qt::AlignTop | Qt::AlignHCenter); - grid->addWidget(cyanWidget, 0, 1, Qt::AlignTop | Qt::AlignHCenter); - grid->addWidget(magentaWidget, 1, 0, Qt::AlignTop | Qt::AlignHCenter); - grid->addWidget(yellowWidget, 1, 1, Qt::AlignTop | Qt::AlignHCenter); - - return frame; -} - -/* - Provides a dialog window to allow the user to specify an image file. - If a file is selected, the appropriate function is called to process - and display it. -*/ - -void Viewer::chooseFile() -{ - QString imageFile = QFileDialog::getOpenFileName(this, - tr("Choose an image file to open"), path, tr("Images (*.*)")); - - if (!imageFile.isEmpty()) { - openImageFile(imageFile); - path = imageFile; - } -} - -/* - Changes the value of the brightness according to the entry selected in the - Brightness menu. The selected entry is checked, and the previously selected - entry is unchecked. - - The color separations are updated to use the new value for the brightness. -*/ - -void Viewer::setBrightness(QAction *action) -{ - if (!menuMap.contains(action) || scaledImage.isNull()) - return; - - Brightness amount = menuMap[action]; - - switch (amount) { - case None: - brightness = 0; break; - case Quarter: - brightness = 64; break; - case Half: - brightness = 128; break; - case ThreeQuarters: - brightness = 191; break; - case Full: - brightness = 255; break; - default: return; - } - - currentBrightness->setChecked(false); - currentBrightness = action; - currentBrightness->setChecked(true); - - createImage(); -} - -/* - Load the image from the file given, and create four pixmaps based - on the original image. - - The window caption is set, and the Brightness menu enabled if the image file - can be loaded. -*/ - -void Viewer::openImageFile(QString &imageFile) -{ - QImage originalImage; - - if (originalImage.load(imageFile)) { - setWindowTitle(imageFile); - //menuBar()->setItemEnabled(brightnessMenuId, true); - saveAction->setEnabled(true); - brightnessMenu->setEnabled(true); - - /* Note: the ScaleMin value may be different for Qt 4. */ - scaledImage = originalImage.scaled(256, 256, Qt::KeepAspectRatio); - - cyanWidget->setImage(scaledImage); - magentaWidget->setImage(scaledImage); - yellowWidget->setImage(scaledImage); - createImage(); - } - else - (void) QMessageBox::warning(this, tr("Cannot open file"), - tr("The selected file could not be opened."), - QMessageBox::Cancel, QMessageBox::NoButton, QMessageBox::NoButton); -} - -/* - Creates an image by combining the contents of the three screens - to present a page preview. - - The image associated with each screen is separated into cyan, - magenta, and yellow components. We add up the values for each - component from the three screen images, and subtract the totals - from the maximum value for each corresponding primary color. -*/ - -void Viewer::createImage() -{ - QImage newImage = scaledImage.copy(); - - QImage *image1 = cyanWidget->image(); - QImage *image2 = magentaWidget->image(); - QImage *image3 = yellowWidget->image(); - int darkness = 255 - brightness; - - for (int y = 0; y < newImage.height(); ++y) { - for (int x = 0; x < newImage.width(); ++x) { - - // Create three screens, using the quantities of the source - // CMY components to determine how much of each of the - // inks are to be put on each screen. - QRgb p1(image1->pixel(x, y)); - float cyan1 = 255 - qRed(p1); - float magenta1 = 255 - qGreen(p1); - float yellow1 = 255 - qBlue(p1); - - QRgb p2(image2->pixel(x, y)); - float cyan2 = 255 - qRed(p2); - float magenta2 = 255 - qGreen(p2); - float yellow2 = 255 - qBlue(p2); - - QRgb p3(image3->pixel(x, y)); - float cyan3 = 255 - qRed(p3); - float magenta3 = 255 - qGreen(p3); - float yellow3 = 255 - qBlue(p3); - - QColor newColor( - qMax(255 - int(cyan1+cyan2+cyan3) - darkness, 0), - qMax(255 - int(magenta1+magenta2+magenta3) - darkness, 0), - qMax(255 - int(yellow1+yellow2+yellow3) - darkness, 0)); - - newImage.setPixel(x, y, newColor.rgb()); - } - } - - finalWidget->setPixmap(QPixmap::fromImage(newImage)); -} - -/* - Provides a dialog window to allow the user to save the image file. -*/ - -void Viewer::saveImage() -{ - QString imageFile = QFileDialog::getSaveFileName(this, - tr("Choose a filename to save the image"), "", tr("Images (*.png)")); - - QFileInfo info(imageFile); - - if (!info.baseName().isEmpty()) { - QString newImageFile = QFileInfo(info.absoluteDir(), - info.baseName() + ".png").absoluteFilePath(); - - if (!finalWidget->pixmap()->save(newImageFile, "PNG")) - (void) QMessageBox::warning(this, tr("Cannot save file"), - tr("The file could not be saved."), - QMessageBox::Cancel, QMessageBox::NoButton, - QMessageBox::NoButton); - } - else - (void) QMessageBox::warning(this, tr("Cannot save file"), - tr("Please enter a valid filename."), - QMessageBox::Cancel, QMessageBox::NoButton, - QMessageBox::NoButton); -} |