Add support for line picking

PickingSettings can ask to get line as well as triangle picks.
Introduces a radius value to compensate for numerical precision
in ray-segment intersections.
Introduces QPickLineEvent with the details about the picking.

Job will perform line picking if appropriate. Hit encode the
type of picking and this is used to generate the right type of
event.

Task-number: QTBUG-58071
Change-Id: I834e6cc08044a8cfb28bba7443034e05267aedbf
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/render/picking/qpicklineevent.h b/src/render/picking/qpicklineevent.h
new file mode 100644
index 000000000..102989450
--- /dev/null
+++ b/src/render/picking/qpicklineevent.h
@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DRENDER_QPICKLINEEVENT_H
+#define QT3DRENDER_QPICKLINEEVENT_H
+
+#include <Qt3DRender/qpickevent.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DRender {
+class QPickLineEventPrivate;
+
+class QT3DRENDERSHARED_EXPORT QPickLineEvent : public QPickEvent
+{
+    Q_OBJECT
+    Q_PROPERTY(uint edgeIndex READ edgeIndex CONSTANT)
+    Q_PROPERTY(uint vertex1Index READ vertex1Index CONSTANT)
+    Q_PROPERTY(uint vertex2Index READ vertex2Index CONSTANT)
+public:
+    QPickLineEvent();
+    QPickLineEvent(const QPointF &position, const QVector3D& worldIntersection, const QVector3D& localIntersection, float distance,
+                   uint edgeIndex, uint vertex1Index, uint vertex2Index, Buttons button, int buttons, int modifiers);
+    ~QPickLineEvent();
+
+public:
+    uint edgeIndex() const;
+    uint vertex1Index() const;
+    uint vertex2Index() const;
+
+private:
+    Q_DECLARE_PRIVATE(QPickLineEvent)
+};
+
+} // Qt3DRender
+
+QT_END_NAMESPACE
+
+#endif // QT3DRENDER_QPICKLINEEVENT_H