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-rw-r--r--libdimensionxx/camera.cpp81
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diff --git a/libdimensionxx/camera.cpp b/libdimensionxx/camera.cpp
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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)
+ { }
+
+ // 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);
+ }
+}