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| |
| /* |
| 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); |
| } |