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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Data Visualization module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 or (at your option) 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.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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "custominputhandler.h"
#include <QtDataVisualization/Q3DCamera>
#include <QtCore/qmath.h>
CustomInputHandler::CustomInputHandler(QAbstract3DGraph *graph, QObject *parent) :
Q3DInputHandler(parent),
m_highlight(0),
m_mousePressed(false),
m_state(StateNormal),
m_axisX(0),
m_axisZ(0),
m_speedModifier(20.0f)
{
// Connect to the item selection signal from graph
connect(graph, &QAbstract3DGraph::selectedElementChanged, this,
&CustomInputHandler::handleElementSelected);
}
void CustomInputHandler::mousePressEvent(QMouseEvent *event, const QPoint &mousePos)
{
if (Qt::LeftButton == event->button()) {
m_highlight->setVisible(false);
m_mousePressed = true;
}
Q3DInputHandler::mousePressEvent(event, mousePos);
}
//! [1]
void CustomInputHandler::wheelEvent(QWheelEvent *event)
{
float delta = float(event->delta());
m_axisXMinValue += delta;
m_axisXMaxValue -= delta;
m_axisZMinValue += delta;
m_axisZMaxValue -= delta;
checkConstraints();
float y = (m_axisXMaxValue - m_axisXMinValue) * m_aspectRatio;
m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue);
m_axisY->setRange(100.0f, y);
m_axisZ->setRange(m_axisZMinValue, m_axisZMaxValue);
}
//! [1]
void CustomInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos)
{
// Check if we're trying to drag axis label
if (m_mousePressed && m_state != StateNormal) {
setPreviousInputPos(inputPosition());
setInputPosition(mousePos);
handleAxisDragging();
} else {
Q3DInputHandler::mouseMoveEvent(event, mousePos);
}
}
void CustomInputHandler::mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos)
{
Q3DInputHandler::mouseReleaseEvent(event, mousePos);
m_mousePressed = false;
m_state = StateNormal;
}
void CustomInputHandler::handleElementSelected(QAbstract3DGraph::ElementType type)
{
switch (type) {
case QAbstract3DGraph::ElementAxisXLabel:
m_state = StateDraggingX;
break;
case QAbstract3DGraph::ElementAxisZLabel:
m_state = StateDraggingZ;
break;
default:
m_state = StateNormal;
break;
}
}
void CustomInputHandler::handleAxisDragging()
{
float distance = 0.0f;
// Get scene orientation from active camera
float xRotation = scene()->activeCamera()->xRotation();
// Calculate directional drag multipliers based on rotation
float xMulX = qCos(qDegreesToRadians(xRotation));
float xMulY = qSin(qDegreesToRadians(xRotation));
float zMulX = qSin(qDegreesToRadians(xRotation));
float zMulY = qCos(qDegreesToRadians(xRotation));
// Get the drag amount
QPoint move = inputPosition() - previousInputPos();
// Adjust axes
switch (m_state) {
//! [0]
case StateDraggingX:
distance = (move.x() * xMulX - move.y() * xMulY) * m_speedModifier;
m_axisXMinValue -= distance;
m_axisXMaxValue -= distance;
if (m_axisXMinValue < m_areaMinValue) {
float dist = m_axisXMaxValue - m_axisXMinValue;
m_axisXMinValue = m_areaMinValue;
m_axisXMaxValue = m_axisXMinValue + dist;
}
if (m_axisXMaxValue > m_areaMaxValue) {
float dist = m_axisXMaxValue - m_axisXMinValue;
m_axisXMaxValue = m_areaMaxValue;
m_axisXMinValue = m_axisXMaxValue - dist;
}
m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue);
break;
//! [0]
case StateDraggingZ:
distance = (move.x() * zMulX + move.y() * zMulY) * m_speedModifier;
m_axisZMinValue += distance;
m_axisZMaxValue += distance;
if (m_axisZMinValue < m_areaMinValue) {
float dist = m_axisZMaxValue - m_axisZMinValue;
m_axisZMinValue = m_areaMinValue;
m_axisZMaxValue = m_axisZMinValue + dist;
}
if (m_axisZMaxValue > m_areaMaxValue) {
float dist = m_axisZMaxValue - m_axisZMinValue;
m_axisZMaxValue = m_areaMaxValue;
m_axisZMinValue = m_axisZMaxValue - dist;
}
m_axisZ->setRange(m_axisZMinValue, m_axisZMaxValue);
break;
default:
break;
}
}
void CustomInputHandler::checkConstraints()
{
//! [2]
if (m_axisXMinValue < m_areaMinValue)
m_axisXMinValue = m_areaMinValue;
if (m_axisXMaxValue > m_areaMaxValue)
m_axisXMaxValue = m_areaMaxValue;
// Don't allow too much zoom in
if ((m_axisXMaxValue - m_axisXMinValue) < m_axisXMinRange) {
float adjust = (m_axisXMinRange - (m_axisXMaxValue - m_axisXMinValue)) / 2.0f;
m_axisXMinValue -= adjust;
m_axisXMaxValue += adjust;
}
//! [2]
if (m_axisZMinValue < m_areaMinValue)
m_axisZMinValue = m_areaMinValue;
if (m_axisZMaxValue > m_areaMaxValue)
m_axisZMaxValue = m_areaMaxValue;
// Don't allow too much zoom in
if ((m_axisZMaxValue - m_axisZMinValue) < m_axisZMinRange) {
float adjust = (m_axisZMinRange - (m_axisZMaxValue - m_axisZMinValue)) / 2.0f;
m_axisZMinValue -= adjust;
m_axisZMaxValue += adjust;
}
}
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