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#include "../base/SRC_FIRST.hpp"
#include "text_path.hpp"
#include "../geometry/angles.hpp"
namespace yg
{
PathPoint::PathPoint(int i, ang::AngleD const & segAngle, m2::PointD const & pt)
: m_i(i),
m_segAngle(segAngle),
m_pt(pt)
{}
PivotPoint::PivotPoint(ang::AngleD const & angle, PathPoint const & pp)
: m_angle(angle), m_pp(pp)
{}
TextPath::TextPath() : m_reverse(false), m_fullLength(0), m_pathOffset(0)
{}
TextPath::TextPath(TextPath const & src, math::Matrix<double, 3, 3> const & m)
{
m_arr.resize(src.m_arr.size());
for (unsigned i = 0; i < m_arr.size(); ++i)
m_arr[i] = src.m_arr[i] * m;
m_fullLength = (m2::PointD(src.m_fullLength, 0) * m).Length(m2::PointD(0, 0) * m);
m_pathOffset = (m2::PointD(src.m_pathOffset, 0) * m).Length(m2::PointD(0, 0) * m);
m_reverse = src.m_reverse;
// checkReverse();
}
TextPath::TextPath(m2::PointD const * arr, size_t sz, double fullLength, double pathOffset)
: m_reverse(false),
m_fullLength(fullLength),
m_pathOffset(pathOffset)
{
ASSERT ( sz > 1, () );
m_arr.resize(sz);
copy(arr, arr + sz, m_arr.begin());
checkReverse();
}
void TextPath::checkReverse()
{
/* assume, that readable text in path should be ('o' - start draw point):
* / o
* / \
* / or \
* o \
*/
double const a = ang::AngleTo(m_arr[0], m_arr[m_arr.size() - 1]);
if (fabs(a) > math::pi / 2.0)
{
// if we swap direction, we need to recalculate path offset from the end
double len = 0.0;
for (size_t i = 1; i < m_arr.size(); ++i)
len += m_arr[i-1].Length(m_arr[i]);
m_pathOffset = m_fullLength - m_pathOffset - len;
ASSERT ( m_pathOffset >= -1.0E-6, () );
if (m_pathOffset < 0.0)
m_pathOffset = 0.0;
m_reverse = true;
}
}
double TextPath::fullLength() const
{
return m_fullLength;
}
double TextPath::pathOffset() const
{
return m_pathOffset;
}
size_t TextPath::size() const { return m_arr.size(); }
m2::PointD TextPath::get(size_t i) const
{
ASSERT ( i < m_arr.size(), ("Index out of range") );
return m_arr[m_reverse ? m_arr.size() - i - 1 : i];
}
m2::PointD TextPath::operator[](size_t i) const { return get(i); }
PathPoint const TextPath::offsetPoint(PathPoint const & pp, double offset)
{
PathPoint res = pp;
if (res.m_i == -1)
return res;
if (offset == 0)
return pp;
bool found = false;
for (size_t i = res.m_i; i < size() - 1; ++i)
{
double l = res.m_pt.Length(get(i + 1));
if (offset <= l)
{
if (i != res.m_i)
res.m_segAngle = ang::AngleD(ang::AngleTo(get(i), get(i + 1)));
res.m_pt = res.m_pt.Move(offset, res.m_segAngle.sin(), res.m_segAngle.cos());
res.m_i = i;
found = true;
break;
}
else
{
offset -= l;
res.m_pt = get(i + 1);
}
}
if (!found)
res.m_i = -1;
return res;
}
PivotPoint TextPath::findPivotPoint(PathPoint const & pp, GlyphMetrics const & sym, double kern)
{
PathPoint startPt = offsetPoint(pp, kern);
PivotPoint res;
if (startPt.m_i == -1)
return res;
m2::PointD pt1 = startPt.m_pt;
double angle = 0;
double advance = sym.m_xOffset + sym.m_width / 2.0;
int j = startPt.m_i;
while (advance > 0)
{
if (j + 1 == size())
return res;
double l = get(j + 1).Length(pt1);
double segAngle = j == startPt.m_i ? startPt.m_segAngle.val() : ang::AngleTo(get(j), get(j + 1));
angle += segAngle;
if (l < advance)
{
advance -= l;
pt1 = get(j + 1);
++j;
}
else
{
ang::AngleD a(segAngle);
res.m_pp.m_i = j;
res.m_pp.m_pt = pt1.Move(advance, a.sin(), a.cos());
advance = 0;
angle /= (res.m_pp.m_i - startPt.m_i + 1);
res.m_angle = ang::AngleD(angle);
res.m_pp.m_segAngle = a;
break;
}
}
return res;
}
}
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