355 lines
12 KiB
C++
355 lines
12 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets>
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#include <math.h>
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#include "tabletcanvas.h"
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//! [0]
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TabletCanvas::TabletCanvas()
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: QWidget(nullptr)
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, m_alphaChannelValuator(TangentialPressureValuator)
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, m_colorSaturationValuator(NoValuator)
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, m_lineWidthValuator(PressureValuator)
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, m_color(Qt::red)
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, m_brush(m_color)
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, m_pen(m_brush, 1.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)
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, m_deviceDown(false)
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{
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resize(500, 500);
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setAutoFillBackground(true);
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setAttribute(Qt::WA_TabletTracking);
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}
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//! [0]
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//! [1]
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bool TabletCanvas::saveImage(const QString &file)
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{
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return m_pixmap.save(file);
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}
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//! [1]
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//! [2]
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bool TabletCanvas::loadImage(const QString &file)
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{
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bool success = m_pixmap.load(file);
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if (success) {
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update();
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return true;
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}
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return false;
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}
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//! [2]
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void TabletCanvas::clear()
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{
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m_pixmap.fill(Qt::white);
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update();
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}
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//! [3]
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void TabletCanvas::tabletEvent(QTabletEvent *event)
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{
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switch (event->type()) {
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case QEvent::TabletPress:
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if (!m_deviceDown) {
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m_deviceDown = true;
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lastPoint.pos = event->posF();
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lastPoint.pressure = event->pressure();
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lastPoint.rotation = event->rotation();
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}
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break;
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case QEvent::TabletMove:
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#ifndef Q_OS_IOS
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if (event->device() == QTabletEvent::RotationStylus)
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updateCursor(event);
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#endif
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if (m_deviceDown) {
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updateBrush(event);
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QPainter painter(&m_pixmap);
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paintPixmap(painter, event);
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lastPoint.pos = event->posF();
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lastPoint.pressure = event->pressure();
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lastPoint.rotation = event->rotation();
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}
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break;
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case QEvent::TabletRelease:
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if (m_deviceDown && event->buttons() == Qt::NoButton)
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m_deviceDown = false;
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update();
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break;
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default:
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break;
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}
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event->accept();
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}
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//! [3]
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//! [4]
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void TabletCanvas::initPixmap()
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{
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qreal dpr = devicePixelRatioF();
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QPixmap newPixmap = QPixmap(width() * dpr, height() * dpr);
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newPixmap.setDevicePixelRatio(dpr);
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newPixmap.fill(Qt::white);
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QPainter painter(&newPixmap);
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if (!m_pixmap.isNull())
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painter.drawPixmap(0, 0, m_pixmap);
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painter.end();
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m_pixmap = newPixmap;
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}
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void TabletCanvas::paintEvent(QPaintEvent *event)
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{
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if (m_pixmap.isNull())
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initPixmap();
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QPainter painter(this);
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QRect pixmapPortion = QRect(event->rect().topLeft() * devicePixelRatioF(),
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event->rect().size() * devicePixelRatioF());
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painter.drawPixmap(event->rect().topLeft(), m_pixmap, pixmapPortion);
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}
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//! [4]
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//! [5]
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void TabletCanvas::paintPixmap(QPainter &painter, QTabletEvent *event)
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{
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static qreal maxPenRadius = pressureToWidth(1.0);
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painter.setRenderHint(QPainter::Antialiasing);
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switch (event->device()) {
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//! [6]
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case QTabletEvent::Airbrush:
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{
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painter.setPen(Qt::NoPen);
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QRadialGradient grad(lastPoint.pos, m_pen.widthF() * 10.0);
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QColor color = m_brush.color();
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color.setAlphaF(color.alphaF() * 0.25);
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grad.setColorAt(0, m_brush.color());
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grad.setColorAt(0.5, Qt::transparent);
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painter.setBrush(grad);
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qreal radius = grad.radius();
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painter.drawEllipse(event->posF(), radius, radius);
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update(QRect(event->pos() - QPoint(radius, radius), QSize(radius * 2, radius * 2)));
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}
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break;
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case QTabletEvent::RotationStylus:
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{
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m_brush.setStyle(Qt::SolidPattern);
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painter.setPen(Qt::NoPen);
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painter.setBrush(m_brush);
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QPolygonF poly;
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qreal halfWidth = pressureToWidth(lastPoint.pressure);
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QPointF brushAdjust(qSin(qDegreesToRadians(-lastPoint.rotation)) * halfWidth,
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qCos(qDegreesToRadians(-lastPoint.rotation)) * halfWidth);
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poly << lastPoint.pos + brushAdjust;
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poly << lastPoint.pos - brushAdjust;
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halfWidth = m_pen.widthF();
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brushAdjust = QPointF(qSin(qDegreesToRadians(-event->rotation())) * halfWidth,
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qCos(qDegreesToRadians(-event->rotation())) * halfWidth);
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poly << event->posF() - brushAdjust;
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poly << event->posF() + brushAdjust;
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painter.drawConvexPolygon(poly);
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update(poly.boundingRect().toRect());
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}
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break;
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//! [6]
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case QTabletEvent::Puck:
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case QTabletEvent::FourDMouse:
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{
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const QString error(tr("This input device is not supported by the example."));
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#if QT_CONFIG(statustip)
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QStatusTipEvent status(error);
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QApplication::sendEvent(this, &status);
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#else
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qWarning() << error;
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#endif
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}
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break;
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default:
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{
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const QString error(tr("Unknown tablet device - treating as stylus"));
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#if QT_CONFIG(statustip)
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QStatusTipEvent status(error);
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QApplication::sendEvent(this, &status);
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#else
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qWarning() << error;
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#endif
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}
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Q_FALLTHROUGH();
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case QTabletEvent::Stylus:
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painter.setPen(m_pen);
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painter.drawLine(lastPoint.pos, event->posF());
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update(QRect(lastPoint.pos.toPoint(), event->pos()).normalized()
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.adjusted(-maxPenRadius, -maxPenRadius, maxPenRadius, maxPenRadius));
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break;
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}
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}
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//! [5]
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qreal TabletCanvas::pressureToWidth(qreal pressure)
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{
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return pressure * 10 + 1;
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}
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//! [7]
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void TabletCanvas::updateBrush(const QTabletEvent *event)
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{
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int hue, saturation, value, alpha;
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m_color.getHsv(&hue, &saturation, &value, &alpha);
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int vValue = int(((event->yTilt() + 60.0) / 120.0) * 255);
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int hValue = int(((event->xTilt() + 60.0) / 120.0) * 255);
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//! [7] //! [8]
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switch (m_alphaChannelValuator) {
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case PressureValuator:
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m_color.setAlphaF(event->pressure());
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break;
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case TangentialPressureValuator:
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if (event->device() == QTabletEvent::Airbrush)
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m_color.setAlphaF(qMax(0.01, (event->tangentialPressure() + 1.0) / 2.0));
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else
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m_color.setAlpha(255);
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break;
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case TiltValuator:
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m_color.setAlpha(maximum(abs(vValue - 127), abs(hValue - 127)));
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break;
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default:
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m_color.setAlpha(255);
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}
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//! [8] //! [9]
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switch (m_colorSaturationValuator) {
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case VTiltValuator:
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m_color.setHsv(hue, vValue, value, alpha);
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break;
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case HTiltValuator:
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m_color.setHsv(hue, hValue, value, alpha);
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break;
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case PressureValuator:
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m_color.setHsv(hue, int(event->pressure() * 255.0), value, alpha);
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break;
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default:
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;
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}
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//! [9] //! [10]
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switch (m_lineWidthValuator) {
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case PressureValuator:
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m_pen.setWidthF(pressureToWidth(event->pressure()));
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break;
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case TiltValuator:
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m_pen.setWidthF(maximum(abs(vValue - 127), abs(hValue - 127)) / 12);
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break;
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default:
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m_pen.setWidthF(1);
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}
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//! [10] //! [11]
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if (event->pointerType() == QTabletEvent::Eraser) {
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m_brush.setColor(Qt::white);
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m_pen.setColor(Qt::white);
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m_pen.setWidthF(event->pressure() * 10 + 1);
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} else {
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m_brush.setColor(m_color);
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m_pen.setColor(m_color);
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}
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}
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//! [11]
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//! [12]
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void TabletCanvas::updateCursor(const QTabletEvent *event)
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{
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QCursor cursor;
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if (event->type() != QEvent::TabletLeaveProximity) {
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if (event->pointerType() == QTabletEvent::Eraser) {
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cursor = QCursor(QPixmap(":/images/cursor-eraser.png"), 3, 28);
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} else {
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switch (event->device()) {
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case QTabletEvent::Stylus:
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cursor = QCursor(QPixmap(":/images/cursor-pencil.png"), 0, 0);
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break;
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case QTabletEvent::Airbrush:
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cursor = QCursor(QPixmap(":/images/cursor-airbrush.png"), 3, 4);
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break;
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case QTabletEvent::RotationStylus: {
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QImage origImg(QLatin1String(":/images/cursor-felt-marker.png"));
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QImage img(32, 32, QImage::Format_ARGB32);
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QColor solid = m_color;
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solid.setAlpha(255);
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img.fill(solid);
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QPainter painter(&img);
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QTransform transform = painter.transform();
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transform.translate(16, 16);
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transform.rotate(event->rotation());
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painter.setTransform(transform);
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painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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painter.drawImage(-24, -24, origImg);
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painter.setCompositionMode(QPainter::CompositionMode_HardLight);
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painter.drawImage(-24, -24, origImg);
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painter.end();
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cursor = QCursor(QPixmap::fromImage(img), 16, 16);
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} break;
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default:
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break;
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}
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}
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}
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setCursor(cursor);
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}
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//! [12]
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void TabletCanvas::resizeEvent(QResizeEvent *)
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{
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initPixmap();
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}
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