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/*
This file is part of Kig, a KDE program for Interactive Geometry.
SPDX-FileCopyrightText: 2006 Pino Toscano <toscano.pino@tiscali.it>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
#include <QStringList>
/**
* This small class server as helper to perform conversions between
* metrical units.
*/
class Unit
{
public:
/**
* The kinds of metrical units we support.
*/
enum MetricalUnit { pixel = 0, cm, in };
explicit Unit(double value = 0.0, Unit::MetricalUnit unit = cm, int dpi = 1);
~Unit();
void setValue(double value);
double value() const;
/**
* Set the unit of the current object to \p unit, but it doesn't
* convert the value to the new unit.
*
* \see convertTo()
*/
void setUnit(Unit::MetricalUnit unit);
/**
* Set the unit of the current object to \p unit and convert the
* value to the new unit using \ref convert().
*
* \see setUnit()
*/
void convertTo(Unit::MetricalUnit unit);
Unit::MetricalUnit unit() const;
double getValue(Unit::MetricalUnit unit) const;
void setDpi(int dpi);
int dpi() const;
/**
* The most useful method of this class: convert the specified
* \p value from the unit \p from to the unit \p to, using the
* specified \p dpi in case of conversions from/to pixels.
*/
static double convert(double value, Unit::MetricalUnit from, Unit::MetricalUnit to, int dpi = 1);
/**
* Get a list of the supported metrical units.
*/
static QStringList unitList();
static Unit::MetricalUnit intToUnit(int index);
/**
* How many decimals the \p unit have.
*/
static int precision(Unit::MetricalUnit unit);
Unit &operator=(const Unit &u);
private:
double mvalue;
Unit::MetricalUnit munit;
int mdpi;
};
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