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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Inkscape Units
+ * These classes are used for defining different unit systems.
+ *
+ * Authors:
+ * Matthew Petroff <matthew@mpetroff.net>
+ *
+ * Copyright (C) 2013 Matthew Petroff
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UTIL_UNITS_H
+#define INKSCAPE_UTIL_UNITS_H
+
+#include <unordered_map>
+#include <boost/operators.hpp>
+#include <glibmm/ustring.h>
+#include <2geom/coord.h>
+#include "svg/svg-length.h"
+
+#ifndef DOXYGEN_SHOULD_SKIP_THIS
+
+#define DEFAULT_UNIT_NAME "mm"
+
+namespace std {
+template <>
+struct hash<Glib::ustring> : public std::unary_function<Glib::ustring, std::size_t> {
+ std::size_t operator()(Glib::ustring const &s) const {
+ return hash<std::string>()(s.raw());
+ }
+};
+} // namespace std
+
+#endif
+
+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
+ : boost::equality_comparable<Unit>
+{
+public:
+ Unit();
+ Unit(UnitType type,
+ double factor,
+ Glib::ustring name,
+ Glib::ustring name_plural,
+ Glib::ustring abbr,
+ Glib::ustring description);
+
+ void clear();
+
+ bool isAbsolute() const { return type != UNIT_TYPE_DIMENSIONLESS; }
+
+ /**
+ * Returns the suggested precision to use for displaying numbers
+ * of this unit.
+ */
+ int defaultDigits() const;
+
+ /** Checks if a unit is compatible with the specified unit. */
+ bool compatibleWith(Unit const *u) const;
+ bool compatibleWith(Glib::ustring const &) const;
+ bool compatibleWith(char const *) const;
+
+ UnitType type;
+ double factor;
+ Glib::ustring name;
+ Glib::ustring name_plural;
+ Glib::ustring abbr;
+ Glib::ustring description;
+
+ /** Check if units are equal. */
+ bool operator==(Unit const &other) const;
+
+ /** Get SVG unit code. */
+ int svgUnit() const;
+
+ /** Convert value from this unit **/
+ double convert(double from_dist, Unit const *to) const;
+ double convert(double from_dist, Glib::ustring const &to) const;
+ double convert(double from_dist, char const *to) const;
+};
+
+class Quantity
+ : boost::totally_ordered<Quantity>
+{
+public:
+ Unit const *unit;
+ double quantity;
+
+ /** Initialize a quantity. */
+ Quantity(double q, Unit const *u);
+ Quantity(double q, Glib::ustring const &u);
+ Quantity(double q, char const *u);
+
+ /** Checks if a quantity is compatible with the specified unit. */
+ bool compatibleWith(Unit const *u) const;
+ bool compatibleWith(Glib::ustring const &u) const;
+ bool compatibleWith(char const *u) const;
+
+ /** Return the quantity's value in the specified unit. */
+ double value(Unit const *u) const;
+ double value(Glib::ustring const &u) const;
+ double value(char const *u) const;
+
+ /** Return a printable string of the value in the specified unit. */
+ Glib::ustring string(Unit const *u) const;
+ Glib::ustring string(Glib::ustring const &u) const;
+ Glib::ustring string() const;
+
+ /** Convert distances.
+ no NULL check is performed on the passed pointers to Unit objects! */
+ static double convert(double from_dist, Unit const *from, Unit const *to);
+ static double convert(double from_dist, Glib::ustring const &from, Unit const *to);
+ static double convert(double from_dist, Unit const *from, Glib::ustring const &to);
+ static double convert(double from_dist, Glib::ustring const &from, Glib::ustring const &to);
+ static double convert(double from_dist, char const *from, char const *to);
+
+ /** Comparison operators. */
+ bool operator<(Quantity const &rhs) const;
+ bool operator==(Quantity const &other) const;
+};
+
+inline bool are_near(Quantity const &a, Quantity const &b, double eps=Geom::EPSILON)
+{
+ return Geom::are_near(a.quantity, b.value(a.unit), eps);
+}
+
+class UnitTable {
+public:
+ /**
+ * Initializes the unit tables and identifies the primary unit types.
+ *
+ * The primary unit's conversion factor is required to be 1.00
+ */
+ UnitTable();
+ virtual ~UnitTable();
+
+ typedef std::unordered_map<Glib::ustring, Unit> UnitMap;
+ typedef std::unordered_map<unsigned, Unit*> UnitCodeMap;
+
+ /** Add a new unit to the table */
+ void addUnit(Unit const &u, bool primary);
+
+ /** Retrieve a given unit based on its string identifier */
+ Unit const *getUnit(Glib::ustring const &name) const;
+ Unit const *getUnit(char const *name) const;
+
+ /** Try to find a unit based on its conversion factor to the primary */
+ Unit const *findUnit(double factor, UnitType type) const;
+
+ /** Retrieve a given unit based on its SVGLength unit */
+ Unit const *getUnit(SVGLength::Unit u) const;
+
+ /** Retrieve a quantity based on its string identifier */
+ Quantity parseQuantity(Glib::ustring const &q) const;
+
+ /** Remove a unit definition from the given unit type table * /
+ * DISABLED, unsafe with the current passing around pointers to Unit objects in this table */
+ //bool deleteUnit(Unit const &u);
+
+ /** Returns true if the given string 'name' is a valid unit in the table */
+ bool hasUnit(Glib::ustring const &name) const;
+
+ /** Provides an iterable list of items in the given unit table */
+ UnitMap units(UnitType type) const;
+
+ /** Returns the default unit abbr for the given type */
+ Glib::ustring primary(UnitType type) const;
+
+ double getScale() const;
+
+ void setScale();
+
+ /** Load units from an XML file.
+ *
+ * Loads and merges the contents of the given file into the UnitTable,
+ * possibly overwriting existing unit definitions.
+ *
+ * @param filename file to be loaded
+ */
+ bool load(std::string const &filename);
+
+ /* * Saves the current UnitTable to the given file. */
+ //bool save(std::string const &filename);
+
+protected:
+ UnitCodeMap _unit_map;
+ Glib::ustring _primary_unit[UNIT_TYPE_QTY];
+
+ double _linear_scale;
+ static Unit _empty_unit;
+
+private:
+ UnitTable(UnitTable const &t);
+ UnitTable operator=(UnitTable const &t);
+
+};
+
+extern UnitTable unit_table;
+
+} // namespace Util
+} // namespace Inkscape
+
+#endif // define INKSCAPE_UTIL_UNITS_H
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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