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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCanvas3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** 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.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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****************************************************************************/
/*!
\example jsonmodels
\since QtCanvas3D 1.0
\title JSON Models Example
\ingroup qtcanvas3d-examples
\brief Load and display several JSON models
The JSON Models Example demonstrates loading and displaying more than
one JSON model and more than one texture. It also implements simple
mouse input handling to allow rotating the scene and zooming into it.
\image jsonmodels-example.png
\section1 JSON Model Loader
First we include a JSON model parser, which handles parsing the JSON
models into our internal models:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 0
The \c{ThreeJSLoader.js} includes a reimplementation of the JSON parser
in \c{three.js}, but we will not go into its implementation details.
\section1 Loading the Models
First we need to initialize all array buffers for the models:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 1
\dots
Then we request the models to be loaded:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 2
\dots
Then, when the load requests return, we handle the models:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 3
\dots
Each buffer is bound and filled with the data parsed from the json models:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 4
\section1 Loading the Textures
First we create the TextureImage objects for each of the images we are
going to load and register handlers for the \c imageLoaded and
\c imageLoadingFailed signals. In the \c imageLoaded signal
handlers we create the OpenGL textures:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 5
\dots
\section1 Input Handling
First we add a MouseArea to fill the Canvas3D:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.qml 0
\dots
Before adding some functionality on it, we need to add properties to the
canvas with initial values set:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.qml 1
After that, we add rotation on mouse movement when the left mouse button
is pressed:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.qml 2
We need to keep the previous x and y values to avoid rotation jumping
when the mouse button is released and pressed again. We store them in
these properties:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.qml 3
Then we add zooming by mouse wheel:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.qml 4
These properties are then used in the JavaScript side when calculating
eye/camera movement:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 7
Converting the rotation values into movement is done as follows:
\snippet jsonmodels/qml/jsonmodels/jsonmodels.js 8
*/
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