286 lines
9.0 KiB
C++
286 lines
9.0 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 demonstration applications 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 <QtCore>
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#include <QtWidgets>
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#include <QtNetwork>
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#include "lightmaps.h"
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#include "slippymap.h"
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// how long (milliseconds) the user need to hold (after a tap on the screen)
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// before triggering the magnifying glass feature
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// 701, a prime number, is the sum of 229, 233, 239
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// (all three are also prime numbers, consecutive!)
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#define HOLD_TIME 701
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// maximum size of the magnifier
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// Hint: see above to find why I picked this one :)
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#define MAX_MAGNIFIER 229
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LightMaps::LightMaps(QWidget *parent)
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: QWidget(parent), pressed(false), snapped(false), zoomed(false),
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invert(false)
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{
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m_normalMap = new SlippyMap(this);
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m_largeMap = new SlippyMap(this);
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connect(m_normalMap, SIGNAL(updated(QRect)), SLOT(updateMap(QRect)));
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connect(m_largeMap, SIGNAL(updated(QRect)), SLOT(update()));
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}
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void LightMaps::setCenter(qreal lat, qreal lng)
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{
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m_normalMap->latitude = lat;
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m_normalMap->longitude = lng;
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m_normalMap->invalidate();
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m_largeMap->latitude = lat;
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m_largeMap->longitude = lng;
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m_largeMap->invalidate();
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}
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void LightMaps::toggleNightMode()
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{
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invert = !invert;
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update();
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}
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void LightMaps::updateMap(const QRect &r)
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{
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update(r);
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}
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void LightMaps::activateZoom()
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{
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zoomed = true;
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tapTimer.stop();
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m_largeMap->zoom = m_normalMap->zoom + 1;
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m_largeMap->width = m_normalMap->width * 2;
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m_largeMap->height = m_normalMap->height * 2;
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m_largeMap->latitude = m_normalMap->latitude;
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m_largeMap->longitude = m_normalMap->longitude;
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m_largeMap->invalidate();
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update();
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}
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void LightMaps::resizeEvent(QResizeEvent *)
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{
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m_normalMap->width = width();
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m_normalMap->height = height();
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m_normalMap->invalidate();
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m_largeMap->width = m_normalMap->width * 2;
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m_largeMap->height = m_normalMap->height * 2;
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m_largeMap->invalidate();
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}
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void LightMaps::paintEvent(QPaintEvent *event)
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{
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QPainter p;
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p.begin(this);
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m_normalMap->render(&p, event->rect());
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p.setPen(Qt::black);
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p.drawText(rect(), Qt::AlignBottom | Qt::TextWordWrap,
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"Map data CCBYSA 2009 OpenStreetMap.org contributors");
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p.end();
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if (zoomed) {
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int dim = qMin(width(), height());
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int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3);
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int radius = magnifierSize / 2;
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int ring = radius - 15;
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QSize box = QSize(magnifierSize, magnifierSize);
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// reupdate our mask
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if (maskPixmap.size() != box) {
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maskPixmap = QPixmap(box);
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maskPixmap.fill(Qt::transparent);
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QRadialGradient g;
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g.setCenter(radius, radius);
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g.setFocalPoint(radius, radius);
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g.setRadius(radius);
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g.setColorAt(1.0, QColor(255, 255, 255, 0));
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g.setColorAt(0.5, QColor(128, 128, 128, 255));
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QPainter mask(&maskPixmap);
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mask.setRenderHint(QPainter::Antialiasing);
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mask.setCompositionMode(QPainter::CompositionMode_Source);
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mask.setBrush(g);
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mask.setPen(Qt::NoPen);
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mask.drawRect(maskPixmap.rect());
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mask.setBrush(QColor(Qt::transparent));
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mask.drawEllipse(g.center(), ring, ring);
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mask.end();
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}
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QPoint center = dragPos - QPoint(0, radius);
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center = center + QPoint(0, radius / 2);
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QPoint corner = center - QPoint(radius, radius);
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QPoint xy = center * 2 - QPoint(radius, radius);
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// only set the dimension to the magnified portion
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if (zoomPixmap.size() != box) {
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zoomPixmap = QPixmap(box);
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zoomPixmap.fill(Qt::lightGray);
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}
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if (true) {
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QPainter p(&zoomPixmap);
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p.translate(-xy);
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m_largeMap->render(&p, QRect(xy, box));
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p.end();
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}
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QPainterPath clipPath;
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clipPath.addEllipse(center, ring, ring);
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QPainter p(this);
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p.setRenderHint(QPainter::Antialiasing);
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p.setClipPath(clipPath);
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p.drawPixmap(corner, zoomPixmap);
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p.setClipping(false);
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p.drawPixmap(corner, maskPixmap);
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p.setPen(Qt::gray);
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p.drawPath(clipPath);
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}
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if (invert) {
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QPainter p(this);
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p.setCompositionMode(QPainter::CompositionMode_Difference);
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p.fillRect(event->rect(), Qt::white);
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p.end();
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}
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}
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void LightMaps::timerEvent(QTimerEvent *)
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{
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if (!zoomed)
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activateZoom();
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update();
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}
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void LightMaps::mousePressEvent(QMouseEvent *event)
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{
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if (event->buttons() != Qt::LeftButton)
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return;
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pressed = snapped = true;
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pressPos = dragPos = event->pos();
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tapTimer.stop();
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tapTimer.start(HOLD_TIME, this);
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}
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void LightMaps::mouseMoveEvent(QMouseEvent *event)
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{
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if (!event->buttons())
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return;
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if (!zoomed) {
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if (!pressed || !snapped) {
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QPoint delta = event->pos() - pressPos;
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pressPos = event->pos();
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m_normalMap->pan(delta);
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return;
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} else {
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const int threshold = 10;
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QPoint delta = event->pos() - pressPos;
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if (snapped) {
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snapped &= delta.x() < threshold;
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snapped &= delta.y() < threshold;
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snapped &= delta.x() > -threshold;
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snapped &= delta.y() > -threshold;
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}
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if (!snapped)
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tapTimer.stop();
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}
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} else {
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dragPos = event->pos();
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update();
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}
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}
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void LightMaps::mouseReleaseEvent(QMouseEvent *)
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{
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zoomed = false;
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update();
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}
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void LightMaps::keyPressEvent(QKeyEvent *event)
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{
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if (!zoomed) {
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if (event->key() == Qt::Key_Left)
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m_normalMap->pan(QPoint(20, 0));
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if (event->key() == Qt::Key_Right)
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m_normalMap->pan(QPoint(-20, 0));
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if (event->key() == Qt::Key_Up)
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m_normalMap->pan(QPoint(0, 20));
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if (event->key() == Qt::Key_Down)
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m_normalMap->pan(QPoint(0, -20));
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if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
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dragPos = QPoint(width() / 2, height() / 2);
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activateZoom();
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}
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} else {
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if (event->key() == Qt::Key_Z || event->key() == Qt::Key_Select) {
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zoomed = false;
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update();
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}
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QPoint delta(0, 0);
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if (event->key() == Qt::Key_Left)
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delta = QPoint(-15, 0);
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if (event->key() == Qt::Key_Right)
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delta = QPoint(15, 0);
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if (event->key() == Qt::Key_Up)
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delta = QPoint(0, -15);
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if (event->key() == Qt::Key_Down)
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delta = QPoint(0, 15);
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if (delta != QPoint(0, 0)) {
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dragPos += delta;
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update();
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}
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}
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}
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