libcruft-util/colour.cpp

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/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
#include "colour.hpp"
#include "range.hpp"
using namespace util;
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colour&
colour::operator*= (double v) {
red *= v;
green *= v;
blue *= v;
alpha *= v;
return *this;
}
const json::node&
util::operator>> (const json::node &node, colour &c) {
c.red = node[0].as_number ();
c.green = node[1].as_number ();
c.blue = node[2].as_number ();
try {
c.alpha = node[3].as_number ();
} catch (...) {
c.alpha = 1.0;
}
return node;
}
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namespace util {
template<>
colour
random (void) {
return colour ({ range<double>::UNIT.random (),
range<double>::UNIT.random (),
range<double>::UNIT.random (),
range<double>::UNIT.random () });
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}
template <>
colour&
randomise (colour &c)
{ return c = random<colour> (); }
}
std::ostream&
util::operator<< (std::ostream &os, const util::colour &c) {
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os << "colour(" << c.red << ", " << c.green << ", " << c.blue << ", " << c.alpha << ")";
return os;
}