Introduce map objects reference implementation

This patch introduces a reference implementation for
the QGeoMapObject subclasses in the locationlabs module.
If this module is built, all current plugins, with
the exception of mapboxgl, will also be able to render
map objects.

The current reference implementation of map objects
is not optimized, but it can be useful for both testing
and feature parity (so that switching between plugins
will give the same result).

Change-Id: I830ebb3813f219e42c085f450952a2b4327361cd
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 218 insertions, 0 deletions

diff --git a/src/location/labs/qsg/qmapcircleobjectqsg.cpp b/src/location/labs/qsg/qmapcircleobjectqsg.cpp
new file mode 100644
index 00000000..10110eab
--- /dev/null
+++ b/src/location/labs/qsg/qmapcircleobjectqsg.cpp
@@ -0,0 +1,218 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtLocation module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmapcircleobjectqsg_p_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static const int CircleSamples = 128;
+
+QMapCircleObjectPrivateQSG::QMapCircleObjectPrivateQSG(QGeoMapObject *q)
+    : QMapCircleObjectPrivateDefault(q)
+{
+
+}
+
+QMapCircleObjectPrivateQSG::QMapCircleObjectPrivateQSG(const QMapCircleObjectPrivate &other)
+    : QMapCircleObjectPrivateDefault(other)
+{
+    // Data already cloned by the *Default copy constructor, but necessary
+    // update operations triggered by setters overrides
+    setCenter(center());
+    setRadius(radius());
+    setColor(color());
+    setBorderColor(borderColor());
+    setBorderWidth(borderWidth());
+}
+
+QMapCircleObjectPrivateQSG::~QMapCircleObjectPrivateQSG()
+{
+
+}
+
+void QMapCircleObjectPrivateQSG::updateCirclePath()
+{
+    const QGeoProjectionWebMercator &p = static_cast<const QGeoProjectionWebMercator&>(m_map->geoProjection());
+    QList<QGeoCoordinate> path;
+    QDeclarativeCircleMapItem::calculatePeripheralPoints(path, center(), radius(), CircleSamples, m_leftBound);
+    m_circlePath.clear();
+    for (const QGeoCoordinate &c : path)
+        m_circlePath << p.geoToMapProjection(c);
+}
+
+void QMapCircleObjectPrivateQSG::updateGeometry()
+{
+    if (!m_map || m_map->geoProjection().projectionType() != QGeoProjection::ProjectionWebMercator
+            || !qIsFinite(m_radius) || !m_center.isValid())
+        return;
+
+    const QGeoProjectionWebMercator &p = static_cast<const QGeoProjectionWebMercator&>(m_map->geoProjection());
+    QScopedValueRollback<bool> rollback(m_updatingGeometry);
+    m_updatingGeometry = true;
+
+    updateCirclePath();
+    QList<QDoubleVector2D> circlePath = m_circlePath;
+
+    int pathCount = circlePath.size();
+    bool preserve = QDeclarativeCircleMapItem::preserveCircleGeometry(circlePath, center(), radius(), p);
+    // using leftBound_ instead of the analytically calculated circle_.boundingGeoRectangle().topLeft());
+    // to fix QTBUG-62154
+    m_geometry.markSourceDirty();
+    m_geometry.setPreserveGeometry(true, m_leftBound); // to set the geoLeftBound_
+    m_geometry.setPreserveGeometry(preserve, m_leftBound);
+
+    bool invertedCircle = false;
+    if (QDeclarativeCircleMapItem::crossEarthPole(center(), radius()) && circlePath.size() == pathCount) {
+        m_geometry.updateScreenPointsInvert(circlePath, *m_map); // invert fill area for really huge circles
+        invertedCircle = true;
+    } else {
+        m_geometry.updateSourcePoints(*m_map, circlePath);
+        m_geometry.updateScreenPoints(*m_map);
+    }
+
+    m_borderGeometry.clear();
+
+    //if (borderColor() != Qt::transparent && borderWidth() > 0)
+    {
+        QList<QDoubleVector2D> closedPath = circlePath;
+        closedPath << closedPath.first();
+
+        if (invertedCircle) {
+            closedPath = m_circlePath;
+            closedPath << closedPath.first();
+            std::reverse(closedPath.begin(), closedPath.end());
+        }
+
+        m_borderGeometry.markSourceDirty();
+        m_borderGeometry.setPreserveGeometry(true, m_leftBound);
+        m_borderGeometry.setPreserveGeometry(preserve, m_leftBound);
+
+        // Use srcOrigin_ from fill geometry after clipping to ensure that translateToCommonOrigin won't fail.
+        const QGeoCoordinate &geometryOrigin = m_geometry.origin();
+
+        m_borderGeometry.clearSource();
+
+        QDoubleVector2D borderLeftBoundWrapped;
+        QList<QList<QDoubleVector2D > > clippedPaths =
+                m_borderGeometry.clipPath(*m_map, closedPath, borderLeftBoundWrapped);
+        if (clippedPaths.size()) {
+            borderLeftBoundWrapped = p.geoToWrappedMapProjection(geometryOrigin);
+            m_borderGeometry.pathToScreen(*m_map, clippedPaths, borderLeftBoundWrapped);
+            m_borderGeometry.updateScreenPoints(*m_map, borderWidth());
+        } else {
+            m_borderGeometry.clear();
+        }
+    }
+
+    QPointF origin = m_map->geoProjection().coordinateToItemPosition(m_geometry.origin(), false).toPointF();
+    m_geometry.translate(origin - m_geometry.firstPointOffset());
+    m_borderGeometry.translate(origin - m_borderGeometry.firstPointOffset());
+}
+
+QGeoMapObjectPrivate *QMapCircleObjectPrivateQSG::clone()
+{
+    return new QMapCircleObjectPrivateQSG(static_cast<QMapCircleObjectPrivate &>(*this));
+}
+
+QSGNode *QMapCircleObjectPrivateQSG::updateMapObjectNode(QSGNode *oldNode, QSGNode *root, QQuickWindow * /*window*/)
+{
+    MapPolygonNode *node = static_cast<MapPolygonNode *>(oldNode);
+
+    bool created = false;
+    if (!node) {
+        node = new MapPolygonNode();
+        created = true;
+    }
+
+    //TODO: update only material
+    if (m_geometry.isScreenDirty() || !m_borderGeometry.isScreenDirty() || !oldNode || created) {
+        //QMapPolygonObject *p = static_cast<QMapPolygonObject *>(q);
+        node->update(color(), borderColor(), &m_geometry, &m_borderGeometry);
+        m_geometry.setPreserveGeometry(false);
+        m_borderGeometry.setPreserveGeometry(false);
+        m_geometry.markClean();
+        m_borderGeometry.markClean();
+    }
+
+    if (created)
+        root->appendChildNode(node);
+
+    return node;
+}
+
+
+void QMapCircleObjectPrivateQSG::setCenter(const QGeoCoordinate &center)
+{
+    m_center = center;
+    updateGeometry();
+    if (m_map)
+        emit m_map->sgNodeChanged();
+}
+
+void QMapCircleObjectPrivateQSG::setRadius(qreal radius)
+{
+    m_radius = radius;
+    updateGeometry();
+    if (m_map)
+        emit m_map->sgNodeChanged();
+}
+
+void QMapCircleObjectPrivateQSG::setColor(const QColor &color)
+{
+    m_fillColor = color;
+    updateGeometry();
+    if (m_map)
+        emit m_map->sgNodeChanged();
+}
+
+void QMapCircleObjectPrivateQSG::setBorderColor(const QColor &color)
+{
+    m_borderColor = color;
+    updateGeometry();
+    if (m_map)
+        emit m_map->sgNodeChanged();
+}
+
+void QMapCircleObjectPrivateQSG::setBorderWidth(qreal width)
+{
+    m_borderWidth = width;
+    updateGeometry();
+    if (m_map)
+        emit m_map->sgNodeChanged();
+}
+
+
+QT_END_NAMESPACE