#include "..\Header\MoveCamera.h"
#include <QVector2D>


int sgn(double value)
{
	if (value > 0)
		return 1;
	else if (value < 0)
		return -1;
	else
		return 0;
}

/////////////////////////////////////////////////////////////////////////
// constructor/destructor

MoveCamera::MoveCamera()
{
	resetView();
}

MoveCamera::~MoveCamera()
{

}


/////////////////////////////////////////////////////////////////////////
// functions

void MoveCamera::rotateAction(QVector2D diff)
{
	QMatrix4x4 rot;
	rot.rotate(-diff.x() * 0.5f, 0, 1, 0);
	rot.rotate(-diff.y() * 0.5f, 1, 0, 0);

	m_direction = rot * m_direction;
	m_direction.normalize();

	m_up = QVector3D::crossProduct(m_direction.toVector3D(), QVector3D::crossProduct(QVector3D(0,1,0), m_direction.toVector3D()));
	m_up.normalize();
}

void MoveCamera::moveAction(QVector2D diff)
{
	QVector3D sideDirection = QVector3D::crossProduct(QVector3D(0, 1, 0), m_direction.toVector3D());
	
	m_position += sgn(diff.y()) * 0.1 * m_zSpeed * QVector4D(sideDirection, 0);
}

void MoveCamera::wheelAction(double value)
{
	m_position -= sgn(value) * 0.1 * m_zSpeed * m_direction;
}

void MoveCamera::recalculateMatrix()
{
	m_matrix = QMatrix4x4();

	m_matrix.lookAt(m_position.toVector3D(), m_position.toVector3D() - m_direction.toVector3D(), m_up);
}

void MoveCamera::resetView()
{
	m_position = { 0,0,4,1 };
	m_direction = { 0,0,1,0 };
	m_up = { 0,1,0 };

	CameraInterface::resetView();
}