SvgNumber.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#pragma once
 
#include <basegfx/range/b2drange.hxx>
#include <vector>
 
namespace svgio::svgreader
{
 
enum class NumberType
{
    xcoordinate,
    ycoordinate,
    length
};
 
class InfoProvider
{
public:
    virtual ~InfoProvider() {}
    virtual basegfx::B2DRange getCurrentViewPort() const = 0;
    virtual double getCurrentFontSizeInherited() const = 0;
    virtual double getCurrentXHeightInherited() const = 0;
};
 
enum class SvgUnit
{
    em = 0,    // relative to current font size
    ex,        // relative to current x-height
 
    px,        // 'user unit'
    pt,        // points, 1/72 in
    pc,        // 1/6 in
    cm,
    mm,
    in,
 
    percent,   // relative to range
    none       // for stroke-miterlimit, which has no unit
};
 
class SvgNumber
{
private:
    double      mfNumber;
    SvgUnit     meUnit;
 
    bool        mbSet : 1;
 
public:
    SvgNumber()
    :   mfNumber(0.0),
        meUnit(SvgUnit::px),
        mbSet(false)
    {
    }
 
    SvgNumber(double fNum, SvgUnit aSvgUnit = SvgUnit::px, bool bSet = true)
    :   mfNumber(fNum),
        meUnit(aSvgUnit),
        mbSet(bSet)
    {
    }
 
    double getNumber() const
    {
        return mfNumber;
    }
 
    SvgUnit getUnit() const
    {
        return meUnit;
    }
 
    bool isSet() const
    {
        return mbSet;
    }
 
    bool isPositive() const
    {
        return basegfx::fTools::moreOrEqual(mfNumber, 0.0);
    }
 
    // Only usable in cases, when the unit is not SvgUnit::percent, otherwise use method solve
    double solveNonPercentage(const InfoProvider& rInfoProvider) const;
 
    double solve(const InfoProvider& rInfoProvider, NumberType aNumberType = NumberType::length) const;
};
 
typedef std::vector<SvgNumber> SvgNumberVector;
 
} // end of namespace svgio::svgreader
 
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