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/*************************************************************************
* Copyright (C) 2009 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
{
// Virtual no-op destructor
Camera::~Camera()
{ }
// Return the result of the dmnsn_camera*'s ray callback
Line
Camera::ray(const Canvas& canvas, unsigned int x, unsigned int y)
{
return Line((*dmnsn()->ray_fn)(dmnsn(), canvas.dmnsn(), x, y));
}
// Return the wrapped camera
dmnsn_camera*
Camera::dmnsn()
{
if (!m_camera) {
throw Dimension_Error("Attempt to access NULL camera.");
}
return *m_camera;
}
// Return a const version of the wrapped canvas
const dmnsn_camera*
Camera::dmnsn() const
{
if (!m_camera) {
throw Dimension_Error("Attempt to access NULL camera.");
}
return *m_camera;
}
// Protected default no-op constructor
Camera::Camera()
: m_camera()
{ }
// Protected copy constructor
Camera::Camera(Camera& camera)
: m_camera(camera.m_camera)
{ }
// Protected manual constructor
Camera::Camera(dmnsn_camera *camera)
: m_camera(new dmnsn_camera*(camera))
{ }
// Is m_camera unique?
bool
Camera::unique() const
{
return m_camera && m_camera.unique();
}
// Set the wrapped dmnsn_camera*
void
Camera::dmnsn(dmnsn_camera* camera)
{
m_camera.reset(new dmnsn_camera*(camera));
}
// 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())
{
dmnsn()->ptr = this;
dmnsn()->ray_fn = &ray_fn;
}
// Delete the camera
Custom_Camera::~Custom_Camera()
{
if (unique()) {
dmnsn_delete_camera(dmnsn());
}
}
}
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