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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtDataVis3D module.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "camerahelper_p.h"
#include <qmath.h>
#include <QMatrix4x4>
#include <QVector3D>
QTCOMMERCIALDATAVIS3D_BEGIN_NAMESPACE
// Initial camera position
QVector3D m_position = QVector3D(0, 0.25, 3);
QVector3D m_target = QVector3D(0, 0, 0);
QVector3D m_up = QVector3D(0, 1, 0);
QPoint m_previousMousePos(0, 0);
float m_xRotation = 0;
float m_yRotation = 0;
float m_defaultXRotation = 0;
float m_defaultYRotation = 0;
const float m_pi = 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679f;
float m_rotationSpeed = 100;
// FUNCTIONS
void CameraHelper::setRotationSpeed(int speed)
{
// increase for faster rotation
m_rotationSpeed = speed;
}
void CameraHelper::setCameraRotation(const QPointF &rotation)
{
m_xRotation = rotation.x();
m_defaultXRotation = m_xRotation;
m_yRotation = rotation.y();
m_defaultYRotation = m_yRotation;
}
void CameraHelper::setDefaultCameraOrientation(const QVector3D &defaultPosition
, const QVector3D &defaultTarget
, const QVector3D &defaultUp)
{
m_position = defaultPosition;
m_target = defaultTarget;
m_up = defaultUp;
}
QMatrix4x4 CameraHelper::calculateViewMatrix(const QPoint &mousePos, int zoom
, int screenWidth, int screenHeight)
{
QMatrix4x4 viewMatrix;
// Calculate mouse movement since last frame
float mouseMoveX = float(m_previousMousePos.x() - mousePos.x())
/ (screenWidth / m_rotationSpeed);
float mouseMoveY = float(m_previousMousePos.y() - mousePos.y())
/ (screenHeight / m_rotationSpeed);
// Apply to rotations
m_xRotation -= mouseMoveX;
m_yRotation -= mouseMoveY;
// Reset at 360 in x and limit to 0...90 in y
if (qFabs(m_xRotation) >= 360)
m_xRotation = 0;
if (m_yRotation >= 90)
m_yRotation = 90;
else if (m_yRotation <= 0)
m_yRotation = 0;
// Apply to view matrix
viewMatrix.lookAt(
m_position // Camera is here
, m_target // and looks here
, m_up // Head is up (set to 0,-1,0 to look upside-down)
);
// Compensate for translation (if m_target is off origin)
viewMatrix.translate(m_target.x(), m_target.y(), m_target.z());
// Apply rotations
// Handle x and z rotation when y -angle is other than 0
viewMatrix.rotate(m_xRotation, 0, cos(m_yRotation*m_pi/180), sin(m_yRotation*m_pi/180));
// y rotation is always "clean"
viewMatrix.rotate(m_yRotation, 1.0f, 0, 0);
// handle zoom by scaling
viewMatrix.scale((float)zoom / 100.0f);
// Compensate for translation (if m_target is off origin)
viewMatrix.translate(-m_target.x(), -m_target.y(), -m_target.z());
//qDebug() << m_xRotation << m_yRotation;
//qDebug() << "sin(m_yRotation)" << sin(m_yRotation*m_pi/180);
//qDebug() << "asin(m_yRotation)" << asin(m_yRotation*m_pi/180);
//qDebug() << "cos(m_yRotation)" << cos(m_yRotation*m_pi/180);
//qDebug() << "tan(m_yRotation)" << tan(m_yRotation*m_pi/180);
m_previousMousePos = mousePos;
return viewMatrix;
}
QVector3D CameraHelper::calculateLightPosition(const QVector3D &lightPosition, float fixedRotation)
{
// Move light with camera
QVector3D newLightPosition;
float xAngle;
float yAngle;
if (!fixedRotation) {
xAngle = m_xRotation * m_pi / 180;
yAngle = m_yRotation * m_pi / 180;
} else {
xAngle = fixedRotation * m_pi / 180;
yAngle = 0;
}
float radius = lightPosition.y() * 2.0f; // set radius to match the highest height of the light
float zPos = radius * cos(xAngle) * cos(yAngle);
float xPos = radius * sin(xAngle) * cos(yAngle);
float yPos = lightPosition.y() * sin(yAngle);
// Keep light in the set position in relation to camera
// TODO: Does not work perfectly yet; Light seems wrong when viewing scene from sides (or isometrically)
newLightPosition = QVector3D(-xPos + lightPosition.x()
, yPos + lightPosition.y()
, zPos + lightPosition.z());
//qDebug() << newLightPosition << xAngle << yAngle << fixedRotation;
return newLightPosition;
}
void CameraHelper::updateMousePos(const QPoint &mousePos)
{
m_previousMousePos = mousePos;
// if mouse position is set to (0, 0), reset rotations
if (QPoint(0, 0) == mousePos) {
m_xRotation = m_defaultXRotation;
m_yRotation = m_defaultYRotation;
}
}
QTCOMMERCIALDATAVIS3D_END_NAMESPACE
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