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/*
This is a rough draft of a global 'units' thingee, to allow dialogs and
the ruler to share info about unit systems... Dunno if this is the
right kind of object though, so we may have to redo this or shift things
around later when it becomes clearer what we need.
This object is used for defining different unit systems.
This is intended to eventually replace inkscape/helper/units.*.
Need to review the Units support that's in Gtkmm already...
*/
#ifndef INKSCAPE_UTIL_UNITS_H
#define INKSCAPE_UTIL_UNITS_H
#include <map>
#include <glibmm/ustring.h>
namespace Inkscape {
namespace Util {
enum UnitType {
UNIT_TYPE_DIMENSIONLESS, /* Percentage */
UNIT_TYPE_LINEAR,
UNIT_TYPE_LINEAR_SCALED,
UNIT_TYPE_RADIAL,
UNIT_TYPE_TIME,
UNIT_TYPE_FONT_HEIGHT,
UNIT_TYPE_QTY,
UNIT_TYPE_NONE = -1
};
const char DEG[] = "°";
class Unit {
public:
Glib::ustring name;
Glib::ustring name_plural;
Glib::ustring abbr;
Glib::ustring description;
UnitType type;
double factor;
bool isAbsolute() const { return type != UNIT_TYPE_DIMENSIONLESS; }
int defaultDigits() const;
bool compatibleWith(const Unit *u) const;
friend bool operator== (const Unit &u1, const Unit &u2);
friend bool operator!= (const Unit &u1, const Unit &u2);
// temporary
int svgUnit() const;
};
class UnitTable {
public:
UnitTable();
virtual ~UnitTable();
typedef std::map<Glib::ustring, Unit*> UnitMap;
void addUnit(Unit const& u, bool primary);
Unit getUnit(Glib::ustring const& name) const;
bool deleteUnit(Unit const& u);
bool hasUnit(Glib::ustring const &name) const;
UnitTable::UnitMap units(UnitType type) const;
Glib::ustring primary(UnitType type) const;
double getScale() const;
void setScale();
bool load(Glib::ustring const &filename);
bool loadText(Glib::ustring const &filename);
bool save(Glib::ustring const &filename);
protected:
UnitTable::UnitMap _unit_map;
Glib::ustring _primary_unit[UNIT_TYPE_QTY];
double _linear_scale;
private:
UnitTable(UnitTable const& t);
UnitTable operator=(UnitTable const& t);
};
class Quantity {
public:
const Unit *unit;
double quantity;
Quantity(double q, const Unit *u); // constructor
bool compatibleWith(const Unit *u) const;
double value(Unit *u) const;
static double convert(const double from_dist, const Unit *from, const Unit *to);
};
} // namespace Util
} // namespace Inkscape
#endif // define INKSCAPE_UTIL_UNITS_H
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