101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010-2013 Danny Robson <danny@nerdcruft.net>
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*/
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#include "colour.hpp"
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#include "range.hpp"
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#include "random.hpp"
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//-----------------------------------------------------------------------------
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using namespace util;
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//-----------------------------------------------------------------------------
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template <typename T>
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const util::colour<T>
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util::colour<T>::WHITE (1.f, 1.f, 1.f, 1.f);
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template <typename T>
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const util::colour<T>
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util::colour<T>::BLACK (0.f, 0.f, 0.f, 1.f);
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template <typename T>
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const util::colour<T>
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util::colour<T>::RED (1.f, 0.f, 0.f, 1.f);
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template <typename T>
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const util::colour<T>
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util::colour<T>::GREEN (0.f, 1.f, 0.f, 1.f);
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template <typename T>
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const util::colour<T>
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util::colour<T>::BLUE (0.f, 0.f, 1.f, 1.f);
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//! Extract a colour object from a JSON node.
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//!
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//! Data must be an array or 3 or 4 numbers. Guarantees success, or throws a
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//! json::tree::type_error.
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const json::tree::node&
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operator>> (const json::tree::node &node, colour4f &c) {
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c.r = static_cast<float> (node[0].as_number ());
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c.g = static_cast<float> (node[1].as_number ());
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c.b = static_cast<float> (node[2].as_number ());
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try {
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c.a = static_cast<float> (node[3].as_number ());
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} catch (...) {
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c.a = 1;
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}
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return node;
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}
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//-----------------------------------------------------------------------------
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namespace util {
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template<>
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colour4f
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random (void) {
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return colour4f ({ range<float>::UNIT.random (),
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range<float>::UNIT.random (),
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range<float>::UNIT.random (),
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range<float>::UNIT.random () });
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}
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template <>
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colour4f&
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randomise (colour4f &c)
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{ return c = random<colour4f> (); }
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}
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//-----------------------------------------------------------------------------
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std::ostream&
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util::operator<< (std::ostream &os, const util::colour4f &c) {
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os << "colour(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
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return os;
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}
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//-----------------------------------------------------------------------------
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template struct util::colour<float>;
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template struct util::colour<double>;
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