Camera.cpp

/*
 *  Copyright (C) 2017  Thales Lima Oliveira <thales@ufu.br>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include "Camera.h"
 
Camera::Camera()
{
    m_translation = wxPoint2DDouble(0, 0);
    m_scale = 1.0;
}
 
Camera::~Camera() {}
wxPoint2DDouble Camera::ScreenToWorld(wxPoint2DDouble screenCoords) const
{
    return wxPoint2DDouble(screenCoords.m_x / m_scale - m_translation.m_x,
                           screenCoords.m_y / m_scale - m_translation.m_y);
}
 
void Camera::SetTranslation(wxPoint2DDouble screenPoint)
{
    m_translation = screenPoint / m_scale - m_translationStartPt;
}
 
void Camera::SetScale(wxPoint2DDouble screenPoint, double delta)
{
    m_translation -= screenPoint * (1.0 - m_scale) / m_scale;
 
    m_scale += delta;
 
    // Limits: 5% - 300%
    if(m_scale < m_zoomMin) m_scale = m_zoomMin;
    if(m_scale > m_zoomMax) m_scale = m_zoomMax;
 
    m_translation += screenPoint * (1.0 - m_scale) / m_scale;
}
 
wxPoint2DDouble Camera::GetMousePosition(bool worldCoords) const
{
    if(worldCoords) return ScreenToWorld(m_mousePosition);
    return m_mousePosition;
}