84 lines
2.5 KiB
C++
84 lines
2.5 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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const util::colour util::colour::WHITE ({ 1.0, 1.0, 1.0, 1.0 });
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const util::colour util::colour::BLACK ({ 0.0, 0.0, 0.0, 1.0 });
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const util::colour util::colour::RED ({ 1.0, 0.0, 0.0, 1.0 });
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const util::colour util::colour::GREEN ({ 0.0, 1.0, 0.0, 1.0 });
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const util::colour util::colour::BLUE ({ 0.0, 0.0, 1.0, 1.0 });
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//-----------------------------------------------------------------------------
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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::type_error.
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const json::node&
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operator>> (const json::node &node, colour &c) {
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c.red = node[0].as_number ();
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c.green = node[1].as_number ();
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c.blue = node[2].as_number ();
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try {
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c.alpha = node[3].as_number ();
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} catch (...) {
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c.alpha = 1.0;
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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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colour
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random (void) {
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return colour ({ range<double>::UNIT.random (),
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range<double>::UNIT.random (),
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range<double>::UNIT.random (),
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range<double>::UNIT.random () });
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}
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template <>
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colour&
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randomise (colour &c)
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{ return c = random<colour> (); }
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}
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//-----------------------------------------------------------------------------
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std::ostream&
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operator<< (std::ostream &os, const util::colour &c) {
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os << "colour(" << c.red << ", " << c.green << ", " << c.blue << ", " << c.alpha << ")";
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return os;
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}
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