QmlDesigner: Add pivot point visualization line to 3D edit view

A line connecting the pivot point and object center is added to
3D edit view.

Change-Id: Ic265e9a3ab2895761cc92b94c778d68509ef36f1
Fixes: QDS-1474
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/editor3d.pri

@@ -2,10 +2,12 @@ HEADERS += $$PWD/generalhelper.h \
            $$PWD/mousearea3d.h \
            $$PWD/camerageometry.h \
            $$PWD/gridgeometry.h \
-           $$PWD/selectionboxgeometry.h
+           $$PWD/selectionboxgeometry.h \
+           $$PWD/linegeometry.h
 
 SOURCES += $$PWD/generalhelper.cpp \
            $$PWD/mousearea3d.cpp \
            $$PWD/camerageometry.cpp \
            $$PWD/gridgeometry.cpp \
-           $$PWD/selectionboxgeometry.cpp
+           $$PWD/selectionboxgeometry.cpp \
+           $$PWD/linegeometry.cpp

share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/linegeometry.cpp

@@ -0,0 +1,102 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#ifdef QUICK3D_MODULE
+
+#include "linegeometry.h"
+
+#include <QtQuick3DRuntimeRender/private/qssgrendergeometry_p.h>
+
+namespace QmlDesigner {
+namespace Internal {
+
+LineGeometry::LineGeometry()
+    : QQuick3DGeometry()
+{
+}
+
+LineGeometry::~LineGeometry()
+{
+}
+
+QVector3D LineGeometry::startPos() const
+{
+    return m_startPos;
+}
+
+QVector3D LineGeometry::endPos() const
+{
+    return m_endPos;
+}
+
+void LineGeometry::setStartPos(const QVector3D &pos)
+{
+    if (pos != m_startPos) {
+        m_startPos = pos;
+        emit startPosChanged();
+        update();
+    }
+}
+
+void LineGeometry::setEndPos(const QVector3D &pos)
+{
+    if (pos != m_endPos) {
+        m_endPos = pos;
+        emit endPosChanged();
+        update();
+    }
+}
+
+QSSGRenderGraphObject *LineGeometry::updateSpatialNode(QSSGRenderGraphObject *node)
+{
+    node = QQuick3DGeometry::updateSpatialNode(node);
+    QSSGRenderGeometry *geometry = static_cast<QSSGRenderGeometry *>(node);
+    geometry->clear();
+
+    QByteArray vertexData;
+    vertexData.resize(2 * 3 * 4); // 2 vertices of 3 floats each 4 bytes
+    float *dataPtr = reinterpret_cast<float *>(vertexData.data());
+
+    dataPtr[0] = m_startPos[0];
+    dataPtr[1] = m_startPos[1];
+    dataPtr[2] = -m_startPos[2];
+    dataPtr[3] = m_endPos[0];
+    dataPtr[4] = m_endPos[1];
+    dataPtr[5] = -m_endPos[2];
+
+    geometry->addAttribute(QSSGRenderGeometry::Attribute::PositionSemantic, 0,
+                           QSSGRenderGeometry::Attribute::ComponentType::F32Type);
+    geometry->setStride(12);
+    geometry->setVertexData(vertexData);
+    geometry->setPrimitiveType(QSSGRenderGeometry::Lines);
+    geometry->setBounds(m_startPos, m_endPos);
+
+    return node;
+}
+
+}
+}
+
+#endif // QUICK3D_MODULE

share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/linegeometry.h

@@ -0,0 +1,70 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#ifdef QUICK3D_MODULE
+
+#include <QtQuick3D/private/qquick3dgeometry_p.h>
+#include <QtGui/QVector3D>
+
+namespace QmlDesigner {
+namespace Internal {
+
+class LineGeometry : public QQuick3DGeometry
+{
+    Q_OBJECT
+    Q_PROPERTY(QVector3D startPos READ startPos WRITE setStartPos NOTIFY startPosChanged)
+    Q_PROPERTY(QVector3D endPos READ endPos WRITE setEndPos NOTIFY endPosChanged)
+
+public:
+    LineGeometry();
+    ~LineGeometry() override;
+
+    QVector3D startPos() const;
+    QVector3D endPos() const;
+
+public Q_SLOTS:
+    void setStartPos(const QVector3D &pos);
+    void setEndPos(const QVector3D &pos);
+
+Q_SIGNALS:
+    void startPosChanged();
+    void endPosChanged();
+
+protected:
+    QSSGRenderGraphObject *updateSpatialNode(QSSGRenderGraphObject *node) override;
+
+private:
+    QVector3D m_startPos;
+    QVector3D m_endPos;
+};
+
+}
+}
+
+QML_DECLARE_TYPE(QmlDesigner::Internal::LineGeometry)
+
+#endif // QUICK3D_MODULE