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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimensionxx.hpp"
namespace Dimension
{
// Pure virtual no-op destructor
Camera::~Camera()
{ }
// Return the wrapped camera
dmnsn_camera*
Camera::dmnsn()
{
return m_camera;
}
// Return a const version of the wrapped canvas
const dmnsn_camera*
Camera::dmnsn() const
{
return m_camera;
}
// Protected default no-op constructor
Camera::Camera()
{ }
// Protected manual constructor
Camera::Camera(dmnsn_camera *camera)
: m_camera(camera)
{ }
Line
Camera::ray(const Canvas& canvas, unsigned int x, unsigned int y)
{
return Line(m_camera->ray_fn(m_camera, canvas.dmnsn(), x, y));
}
// Custom camera callbacks
namespace {
dmnsn_line
ray_fn(const dmnsn_camera *camera, const dmnsn_canvas *canvas,
unsigned int x, unsigned int y)
{
Custom_Camera* ccamera = reinterpret_cast<Custom_Camera*>(camera->ptr);
// Yes the const_cast is ugly, but there's no other way because C++
// doesn't have `const' constructors. Luckily const Camera's treat their
// dmnsn_camera* as a const dmnsn_camera*.
return ccamera->ray(
Canvas(const_cast<dmnsn_canvas*>(canvas)), x, y
).dmnsn();
}
}
// Initialize a new camera, using member functions as callbacks
Custom_Camera::Custom_Camera()
: Camera(dmnsn_new_camera())
{
m_camera->ptr = this;
m_camera->ray_fn = &ray_fn;
}
// Delete the camera
Custom_Camera::~Custom_Camera()
{
dmnsn_delete_camera(m_camera);
}
}
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