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/****************************************************************************
**
** Copyright (C) 2019 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.
**
****************************************************************************/
import QtQuick 2.0
import QtQuick3D 1.0
import MouseArea3D 1.0
Node {
id: overlayNode
property View3D view3D
property Node target: parent
property bool autoScale: true
// Read-only
property real relativeScale: 1
onSceneTransformChanged: updateScale()
onAutoScaleChanged: updateScale()
Connections {
target: view3D.camera
onSceneTransformChanged: updateScale()
}
function getScale(baseScale)
{
return Qt.vector3d(baseScale.x * relativeScale, baseScale.y * relativeScale,
baseScale.z * relativeScale);
}
function updateScale()
{
if (!autoScale) {
target.scale = Qt.vector3d(1, 1, 1);
} else {
// Calculate the distance independent scale by first mapping the targets position to
// the view. We then measure up a distance on the view (100px) that we use as an
// "anchor" distance. Map the two positions back to the target node, and measure the
// distance between them now, in the 3D scene. The difference of the two distances,
// view and scene, will tell us what the distance independent scale should be.
var posInView1 = view3D.mapFrom3DScene(scenePosition);
var posInView2 = Qt.vector3d(posInView1.x + 100, posInView1.y, posInView1.z);
var rayPos1 = view3D.mapTo3DScene(Qt.vector3d(posInView2.x, posInView2.y, 0));
var rayPos2 = view3D.mapTo3DScene(Qt.vector3d(posInView2.x, posInView2.y, 10));
var planeNormal = view3D.camera.forward;
var rayHitPos = helper.rayIntersectsPlane(rayPos1, rayPos2, scenePosition,
planeNormal);
relativeScale = scenePosition.minus(rayHitPos).length() / 100;
}
}
MouseArea3D {
id: helper
view3D: overlayNode.view3D
}
}
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