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#include "camerahelper_p.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;
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(QPointF rotation)
{
m_xRotation = rotation.x();
m_defaultXRotation = m_xRotation;
m_yRotation = rotation.y();
m_defaultYRotation = m_yRotation;
}
void CameraHelper::setDefaultCameraOrientation(QVector3D defaultPosition
, QVector3D defaultTarget
, QVector3D defaultUp)
{
m_position = defaultPosition;
m_target = defaultTarget;
m_up = defaultUp;
}
QMatrix4x4 CameraHelper::calculateViewMatrix(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 (fabs(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)
);
// 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);
//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;
}
void CameraHelper::updateMousePos(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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