/usr/include/mircore/mir/geometry/length.h is in libmircore-dev 0.26.3+16.04.20170605-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
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* Copyright © 2014. 2016 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program 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/>.
*
* Authored by: Daniel van Vugt <daniel.van.vugt@canonical.com>
*/
#ifndef MIR_GEOMETRY_LENGTH_H_
#define MIR_GEOMETRY_LENGTH_H_
namespace mir
{
namespace geometry
{
/// Length represents a physical length in the real world. The number of pixels
/// this equates to can then be calculated based on a given DPI.
class Length
{
public:
enum Units
{
micrometres = 1,
millimetres = 1000,
centimetres = 10000,
inches = 25400
};
constexpr Length() : magnitude(0) {}
constexpr Length(Length const&) = default;
constexpr Length(float mag, Units units) : magnitude(mag * units) {}
Length& operator=(Length const&) = default;
constexpr float as(Units units) const
{
return static_cast<float>(magnitude) / units;
}
constexpr float as_pixels(float dpi) const
{
return as(inches) * dpi;
}
constexpr bool operator==(Length const& rhs) const
{
return magnitude == rhs.magnitude;
}
constexpr bool operator!=(Length const& rhs) const
{
return magnitude != rhs.magnitude;
}
private:
float magnitude;
};
inline constexpr Length operator"" _mm(long double mag)
{
return Length(mag, Length::millimetres);
}
inline constexpr Length operator"" _mm(unsigned long long mag)
{
return Length(mag, Length::millimetres);
}
inline constexpr Length operator"" _cm(long double mag)
{
return Length(mag, Length::centimetres);
}
inline constexpr Length operator"" _cm(unsigned long long mag)
{
return Length(mag, Length::centimetres);
}
inline constexpr Length operator"" _in(long double mag)
{
return Length(mag, Length::inches);
}
inline constexpr Length operator"" _in(unsigned long long mag)
{
return Length(mag, Length::inches);
}
} // namespace geometry
} // namespace mir
#endif // MIR_GEOMETRY_LENGTH_H_
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