qt-everywhere-src-5.14.1/qtbase/examples/embedded/lightmaps/lightmaps.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtCore>
 #include <QtWidgets>
 #include <QtNetwork>

 #include "lightmaps.h"
 #include "slippymap.h"

 // how long (milliseconds) the user need to hold (after a tap on the screen)
 // before triggering the magnifying glass feature
 // 701, a prime number, is the sum of 229, 233, 239
 // (all three are also prime numbers, consecutive!)
 #define HOLD_TIME 701

 // maximum size of the magnifier
 // Hint: see above to find why I picked this one :)
 #define MAX_MAGNIFIER 229

 LightMaps::LightMaps(QWidget *parent)
     : QWidget(parent), pressed(false), snapped(false), zoomed(false),
       invert(false)
 {
     m_normalMap = new SlippyMap(this);
     m_largeMap = new SlippyMap(this);
     connect(m_normalMap, SIGNAL(updated(QRect)), SLOT(updateMap(QRect)));
     connect(m_largeMap, SIGNAL(updated(QRect)), SLOT(update()));
 }

 void LightMaps::setCenter(qreal lat, qreal lng)
 {
     m_normalMap->latitude = lat;
     m_normalMap->longitude = lng;
     m_normalMap->invalidate();
     m_largeMap->latitude = lat;
     m_largeMap->longitude = lng;
     m_largeMap->invalidate();
 }

 void LightMaps::toggleNightMode()
 {
     invert = !invert;
     update();
 }

 void LightMaps::updateMap(const QRect &r)
 {
     update(r);
 }

 void LightMaps::activateZoom()
 {
     zoomed = true;
     tapTimer.stop();
     m_largeMap->zoom = m_normalMap->zoom + 1;
     m_largeMap->width = m_normalMap->width * 2;
     m_largeMap->height = m_normalMap->height * 2;
     m_largeMap->latitude = m_normalMap->latitude;
     m_largeMap->longitude = m_normalMap->longitude;
     m_largeMap->invalidate();
     update();
 }

 void LightMaps::resizeEvent(QResizeEvent *)
 {
     m_normalMap->width = width();
     m_normalMap->height = height();
     m_normalMap->invalidate();
     m_largeMap->width = m_normalMap->width * 2;
     m_largeMap->height = m_normalMap->height * 2;
     m_largeMap->invalidate();
 }

 void LightMaps::paintEvent(QPaintEvent *event)
 {
     QPainter p;
     p.begin(this);
     m_normalMap->render(&p, event->rect());
     p.setPen(Qt::black);
     p.drawText(rect(),  Qt::AlignBottom | Qt::TextWordWrap,
                 "Map data CCBYSA 2009 OpenStreetMap.org contributors");
     p.end();

     if (zoomed) {
         int dim = qMin(width(), height());
         int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3);
         int radius = magnifierSize / 2;
         int ring = radius - 15;
         QSize box = QSize(magnifierSize, magnifierSize);

         // reupdate our mask
         if (maskPixmap.size() != box) {
             maskPixmap = QPixmap(box);
             maskPixmap.fill(Qt::transparent);

             QRadialGradient g;
             g.setCenter(radius, radius);
             g.setFocalPoint(radius, radius);
             g.setRadius(radius);
             g.setColorAt(1.0, QColor(255, 255, 255, 0));
             g.setColorAt(0.5, QColor(128, 128, 128, 255));

             QPainter mask(&maskPixmap);
             mask.setRenderHint(QPainter::Antialiasing);
             mask.setCompositionMode(QPainter::CompositionMode_Source);
             mask.setBrush(g);
             mask.setPen(Qt::NoPen);
             mask.drawRect(maskPixmap.rect());
             mask.setBrush(QColor(Qt::transparent));
             mask.drawEllipse(g.center(), ring, ring);
             mask.end();
         }

         QPoint center = dragPos - QPoint(0, radius);
         center = center + QPoint(0, radius / 2);
         QPoint corner = center - QPoint(radius, radius);

         QPoint xy = center * 2 - QPoint(radius, radius);

         // only set the dimension to the magnified portion
         if (zoomPixmap.size() != box) {
             zoomPixmap = QPixmap(box);
             zoomPixmap.fill(Qt::lightGray);
         }
         if (true) {
             QPainter p(&zoomPixmap);
             p.translate(-xy);
             m_largeMap->render(&p, QRect(xy, box));
             p.end();
         }

         QPainterPath clipPath;
         clipPath.addEllipse(center, ring, ring);

         QPainter p(this);
         p.setRenderHint(QPainter::Antialiasing);
         p.setClipPath(clipPath);
         p.drawPixmap(corner, zoomPixmap);
         p.setClipping(false);
         p.drawPixmap(corner, maskPixmap);
         p.setPen(Qt::gray);
         p.drawPath(clipPath);
     }
     if (invert) {
         QPainter p(this);
         p.setCompositionMode(QPainter::CompositionMode_Difference);
         p.fillRect(event->rect(), Qt::white);
         p.end();
     }
 }

 void LightMaps::timerEvent(QTimerEvent *)
 {
     if (!zoomed)
         activateZoom();
     update();
 }

 void LightMaps::mousePressEvent(QMouseEvent *event)
 {
     if (event->buttons() != Qt::LeftButton)
         return;
     pressed = snapped = true;
     pressPos = dragPos = event->pos();
     tapTimer.stop();
     tapTimer.start(HOLD_TIME, this);
 }

 void LightMaps::mouseMoveEvent(QMouseEvent *event)
 {
     if (!event->buttons())
         return;
     if (!zoomed) {
         if (!pressed || !snapped) {
             QPoint delta = event->pos() - pressPos;
             pressPos = event->pos();
             m_normalMap->pan(delta);
             return;
         } else {
             const int threshold = 10;
             QPoint delta = event->pos() - pressPos;
             if (snapped) {
                 snapped &= delta.x() < threshold;
                 snapped &= delta.y() < threshold;
                 snapped &= delta.x() > -threshold;
                 snapped &= delta.y() > -threshold;
             }
             if (!snapped)
                 tapTimer.stop();
         }
     } else {
         dragPos = event->pos();
         update();
     }
 }

 void LightMaps::mouseReleaseEvent(QMouseEvent *)
 {
     zoomed = false;
     update();
 }

 void LightMaps::keyPressEvent(QKeyEvent *event)
 {
     if (!zoomed) {
         if (event->key() == Qt::Key_Left)
             m_normalMap->pan(QPoint(20, 0));
         if (event->key() == Qt::Key_Right)
             m_normalMap->pan(QPoint(-20, 0));
         if (event->key() == Qt::Key_Up)
             m_normalMap->pan(QPoint(0, 20));
         if (event->key() == Qt::Key_Down)
             m_normalMap->pan(QPoint(0, -20));
         if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
             dragPos = QPoint(width() / 2, height() / 2);
             activateZoom();
         }
     } else {
         if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
             zoomed = false;
             update();
         }
         QPoint delta(0, 0);
         if (event->key() == Qt::Key_Left)
             delta = QPoint(-15, 0);
         if (event->key() == Qt::Key_Right)
             delta = QPoint(15, 0);
         if (event->key() == Qt::Key_Up)
             delta = QPoint(0, -15);
         if (event->key() == Qt::Key_Down)
             delta = QPoint(0, 15);
         if (delta != QPoint(0, 0)) {
             dragPos += delta;
             update();
         }
     }
 }
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the demonstration applications of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** 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."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include <QtCore>
	#include <QtWidgets>
	#include <QtNetwork>

	#include "lightmaps.h"
	#include "slippymap.h"

	// how long (milliseconds) the user need to hold (after a tap on the screen)
	// before triggering the magnifying glass feature
	// 701, a prime number, is the sum of 229, 233, 239
	// (all three are also prime numbers, consecutive!)
	#define HOLD_TIME 701

	// maximum size of the magnifier
	// Hint: see above to find why I picked this one :)
	#define MAX_MAGNIFIER 229

	LightMaps::LightMaps(QWidget *parent)
	: QWidget(parent), pressed(false), snapped(false), zoomed(false),
	invert(false)
	{
	m_normalMap = new SlippyMap(this);
	m_largeMap = new SlippyMap(this);
	connect(m_normalMap, SIGNAL(updated(QRect)), SLOT(updateMap(QRect)));
	connect(m_largeMap, SIGNAL(updated(QRect)), SLOT(update()));
	}

	void LightMaps::setCenter(qreal lat, qreal lng)
	{
	m_normalMap->latitude = lat;
	m_normalMap->longitude = lng;
	m_normalMap->invalidate();
	m_largeMap->latitude = lat;
	m_largeMap->longitude = lng;
	m_largeMap->invalidate();
	}

	void LightMaps::toggleNightMode()
	{
	invert = !invert;
	update();
	}

	void LightMaps::updateMap(const QRect &r)
	{
	update(r);
	}

	void LightMaps::activateZoom()
	{
	zoomed = true;
	tapTimer.stop();
	m_largeMap->zoom = m_normalMap->zoom + 1;
	m_largeMap->width = m_normalMap->width * 2;
	m_largeMap->height = m_normalMap->height * 2;
	m_largeMap->latitude = m_normalMap->latitude;
	m_largeMap->longitude = m_normalMap->longitude;
	m_largeMap->invalidate();
	update();
	}

	void LightMaps::resizeEvent(QResizeEvent *)
	{
	m_normalMap->width = width();
	m_normalMap->height = height();
	m_normalMap->invalidate();
	m_largeMap->width = m_normalMap->width * 2;
	m_largeMap->height = m_normalMap->height * 2;
	m_largeMap->invalidate();
	}

	void LightMaps::paintEvent(QPaintEvent *event)
	{
	QPainter p;
	p.begin(this);
	m_normalMap->render(&p, event->rect());
	p.setPen(Qt::black);
	p.drawText(rect(), Qt::AlignBottom \| Qt::TextWordWrap,
	"Map data CCBYSA 2009 OpenStreetMap.org contributors");
	p.end();

	if (zoomed) {
	int dim = qMin(width(), height());
	int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3);
	int radius = magnifierSize / 2;
	int ring = radius - 15;
	QSize box = QSize(magnifierSize, magnifierSize);

	// reupdate our mask
	if (maskPixmap.size() != box) {
	maskPixmap = QPixmap(box);
	maskPixmap.fill(Qt::transparent);

	QRadialGradient g;
	g.setCenter(radius, radius);
	g.setFocalPoint(radius, radius);
	g.setRadius(radius);
	g.setColorAt(1.0, QColor(255, 255, 255, 0));
	g.setColorAt(0.5, QColor(128, 128, 128, 255));

	QPainter mask(&maskPixmap);
	mask.setRenderHint(QPainter::Antialiasing);
	mask.setCompositionMode(QPainter::CompositionMode_Source);
	mask.setBrush(g);
	mask.setPen(Qt::NoPen);
	mask.drawRect(maskPixmap.rect());
	mask.setBrush(QColor(Qt::transparent));
	mask.drawEllipse(g.center(), ring, ring);
	mask.end();
	}

	QPoint center = dragPos - QPoint(0, radius);
	center = center + QPoint(0, radius / 2);
	QPoint corner = center - QPoint(radius, radius);

	QPoint xy = center * 2 - QPoint(radius, radius);

	// only set the dimension to the magnified portion
	if (zoomPixmap.size() != box) {
	zoomPixmap = QPixmap(box);
	zoomPixmap.fill(Qt::lightGray);
	}
	if (true) {
	QPainter p(&zoomPixmap);
	p.translate(-xy);
	m_largeMap->render(&p, QRect(xy, box));
	p.end();
	}

	QPainterPath clipPath;
	clipPath.addEllipse(center, ring, ring);

	QPainter p(this);
	p.setRenderHint(QPainter::Antialiasing);
	p.setClipPath(clipPath);
	p.drawPixmap(corner, zoomPixmap);
	p.setClipping(false);
	p.drawPixmap(corner, maskPixmap);
	p.setPen(Qt::gray);
	p.drawPath(clipPath);
	}
	if (invert) {
	QPainter p(this);
	p.setCompositionMode(QPainter::CompositionMode_Difference);
	p.fillRect(event->rect(), Qt::white);
	p.end();
	}
	}

	void LightMaps::timerEvent(QTimerEvent *)
	{
	if (!zoomed)
	activateZoom();
	update();
	}

	void LightMaps::mousePressEvent(QMouseEvent *event)
	{
	if (event->buttons() != Qt::LeftButton)
	return;
	pressed = snapped = true;
	pressPos = dragPos = event->pos();
	tapTimer.stop();
	tapTimer.start(HOLD_TIME, this);
	}

	void LightMaps::mouseMoveEvent(QMouseEvent *event)
	{
	if (!event->buttons())
	return;
	if (!zoomed) {
	if (!pressed \|\| !snapped) {
	QPoint delta = event->pos() - pressPos;
	pressPos = event->pos();
	m_normalMap->pan(delta);
	return;
	} else {
	const int threshold = 10;
	QPoint delta = event->pos() - pressPos;
	if (snapped) {
	snapped &= delta.x() < threshold;
	snapped &= delta.y() < threshold;
	snapped &= delta.x() > -threshold;
	snapped &= delta.y() > -threshold;
	}
	if (!snapped)
	tapTimer.stop();
	}
	} else {
	dragPos = event->pos();
	update();
	}
	}

	void LightMaps::mouseReleaseEvent(QMouseEvent *)
	{
	zoomed = false;
	update();
	}

	void LightMaps::keyPressEvent(QKeyEvent *event)
	{
	if (!zoomed) {
	if (event->key() == Qt::Key_Left)
	m_normalMap->pan(QPoint(20, 0));
	if (event->key() == Qt::Key_Right)
	m_normalMap->pan(QPoint(-20, 0));
	if (event->key() == Qt::Key_Up)
	m_normalMap->pan(QPoint(0, 20));
	if (event->key() == Qt::Key_Down)
	m_normalMap->pan(QPoint(0, -20));
	if (event->key() == Qt::Key_Z \|\| event->key() == Qt::Key_Select) {
	dragPos = QPoint(width() / 2, height() / 2);
	activateZoom();
	}
	} else {
	if (event->key() == Qt::Key_Z \|\| event->key() == Qt::Key_Select) {
	zoomed = false;
	update();
	}
	QPoint delta(0, 0);
	if (event->key() == Qt::Key_Left)
	delta = QPoint(-15, 0);
	if (event->key() == Qt::Key_Right)
	delta = QPoint(15, 0);
	if (event->key() == Qt::Key_Up)
	delta = QPoint(0, -15);
	if (event->key() == Qt::Key_Down)
	delta = QPoint(0, 15);
	if (delta != QPoint(0, 0)) {
	dragPos += delta;
	update();
	}
	}
	}