diff options
Diffstat (limited to 'tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp')
-rw-r--r-- | tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp b/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp new file mode 100644 index 0000000000..fb5e62906b --- /dev/null +++ b/tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp @@ -0,0 +1,190 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include <QtWidgets> +#if defined(QT_PRINTSUPPORT_LIB) +#include <QtPrintSupport/qtprintsupportglobal.h> +#if QT_CONFIG(printdialog) +#include <QPrinter> +#include <QPrintDialog> +#endif +#endif + +#include "scribblearea.h" + +static const qreal MinimumDiameter = 3.0; +static const qreal MaximumDiameter = 50.0; + +//! [0] +ScribbleArea::ScribbleArea(QWidget *parent) + : QWidget(parent) +{ + setAttribute(Qt::WA_AcceptTouchEvents); + setAttribute(Qt::WA_StaticContents); + modified = false; + + myPenColors + << QColor("green") + << QColor("purple") + << QColor("red") + << QColor("blue") + << QColor("yellow") + + << QColor("pink") + << QColor("orange") + << QColor("brown") + << QColor("grey") + << QColor("black"); +} +//! [0] + +//! [1] +bool ScribbleArea::openImage(const QString &fileName) +//! [1] //! [2] +{ + QImage loadedImage; + if (!loadedImage.load(fileName)) + return false; + + QSize newSize = loadedImage.size().expandedTo(size()); + resizeImage(&loadedImage, newSize); + image = loadedImage; + modified = false; + update(); + return true; +} +//! [2] + +//! [3] +bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat) +//! [3] //! [4] +{ + QImage visibleImage = image; + resizeImage(&visibleImage, size()); + + if (visibleImage.save(fileName, fileFormat)) { + modified = false; + return true; + } else { + return false; + } +} +//! [4] + +//! [9] +void ScribbleArea::clearImage() +//! [9] //! [10] +{ + image.fill(qRgb(255, 255, 255)); + modified = true; + update(); +} +//! [10] + +//! [12] //! [13] +void ScribbleArea::paintEvent(QPaintEvent *event) +//! [13] //! [14] +{ + QPainter painter(this); + const QRect rect = event->rect(); + painter.drawImage(rect.topLeft(), image, rect); +} +//! [14] + +//! [15] +void ScribbleArea::resizeEvent(QResizeEvent *event) +//! [15] //! [16] +{ + if (width() > image.width() || height() > image.height()) { + int newWidth = qMax(width() + 128, image.width()); + int newHeight = qMax(height() + 128, image.height()); + resizeImage(&image, QSize(newWidth, newHeight)); + update(); + } + QWidget::resizeEvent(event); +} +//! [16] + +//! [19] +void ScribbleArea::resizeImage(QImage *image, const QSize &newSize) +//! [19] //! [20] +{ + if (image->size() == newSize) + return; + + QImage newImage(newSize, QImage::Format_RGB32); + newImage.fill(qRgb(255, 255, 255)); + QPainter painter(&newImage); + painter.drawImage(QPoint(0, 0), *image); + *image = newImage; +} +//! [20] + +//! [21] +void ScribbleArea::print() +{ +#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog) + QPrinter printer(QPrinter::HighResolution); + + QPrintDialog printDialog(&printer, this); +//! [21] //! [22] + if (printDialog.exec() == QDialog::Accepted) { + QPainter painter(&printer); + QRect rect = painter.viewport(); + QSize size = image.size(); + size.scale(rect.size(), Qt::KeepAspectRatio); + painter.setViewport(rect.x(), rect.y(), size.width(), size.height()); + painter.setWindow(image.rect()); + painter.drawImage(0, 0, image); + } +#endif // QT_CONFIG(printdialog) +} +//! [22] + +bool ScribbleArea::event(QEvent *event) +{ + switch (event->type()) { + case QEvent::TouchBegin: + case QEvent::TouchUpdate: + case QEvent::TouchEnd: + { + const QTouchEvent *touch = static_cast<QTouchEvent *>(event); + const auto touchPoints = static_cast<QTouchEvent *>(event)->points(); + for (const QTouchEvent::TouchPoint &touchPoint : touchPoints) { + switch (touchPoint.state()) { + case QEventPoint::Stationary: + case QEventPoint::Released: + // don't do anything if this touch point hasn't moved or has been released + continue; + default: + { + QSizeF diams = touchPoint.ellipseDiameters(); + if (diams.isEmpty()) { + qreal diameter = MaximumDiameter; + if (touch->pointingDevice()->capabilities().testFlag(QPointingDevice::Capability::Pressure)) + diameter = MinimumDiameter + (MaximumDiameter - MinimumDiameter) * touchPoint.pressure(); + diams = QSizeF(diameter, diameter); + } + + QPainter painter(&image); + painter.setPen(Qt::NoPen); + painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count())); + painter.drawEllipse(touchPoint.position(), diams.width() / 2, diams.height() / 2); + painter.end(); + + modified = true; + const int rad = 2; + QRectF rect(QPointF(), diams); + rect.moveCenter(touchPoint.position()); + update(rect.toRect().adjusted(-rad,-rad, +rad, +rad)); + } + break; + } + } + break; + } + default: + return QWidget::event(event); + } + return true; +} |