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#include <qpdf/QPDFMatrix.hh>
#include <qpdf/QUtil.hh>
#include <algorithm>
QPDFMatrix::QPDFMatrix() :
a(1.0),
b(0.0),
c(0.0),
d(1.0),
e(0.0),
f(0.0)
{
}
QPDFMatrix::QPDFMatrix(double a, double b, double c,
double d, double e, double f) :
a(a),
b(b),
c(c),
d(d),
e(e),
f(f)
{
}
QPDFMatrix::QPDFMatrix(QPDFObjectHandle::Matrix const& m) :
a(m.a),
b(m.b),
c(m.c),
d(m.d),
e(m.e),
f(m.f)
{
}
static double fix_rounding(double d)
{
if ((d > -0.00001) && (d < 0.00001))
{
d = 0.0;
}
return d;
}
std::string
QPDFMatrix::unparse() const
{
return (QUtil::double_to_string(fix_rounding(a), 5) + " " +
QUtil::double_to_string(fix_rounding(b), 5) + " " +
QUtil::double_to_string(fix_rounding(c), 5) + " " +
QUtil::double_to_string(fix_rounding(d), 5) + " " +
QUtil::double_to_string(fix_rounding(e), 5) + " " +
QUtil::double_to_string(fix_rounding(f), 5));
}
QPDFObjectHandle::Matrix
QPDFMatrix::getAsMatrix() const
{
return QPDFObjectHandle::Matrix(a, b, c, d, e, f);
}
void
QPDFMatrix::concat(QPDFMatrix const& other)
{
double ap = (this->a * other.a) + (this->c * other.b);
double bp = (this->b * other.a) + (this->d * other.b);
double cp = (this->a * other.c) + (this->c * other.d);
double dp = (this->b * other.c) + (this->d * other.d);
double ep = (this->a * other.e) + (this->c * other.f) + this->e;
double fp = (this->b * other.e) + (this->d * other.f) + this->f;
this-> a = ap;
this-> b = bp;
this-> c = cp;
this-> d = dp;
this-> e = ep;
this-> f = fp;
}
void
QPDFMatrix::scale(double sx, double sy)
{
concat(QPDFMatrix(sx, 0, 0, sy, 0, 0));
}
void
QPDFMatrix::translate(double tx, double ty)
{
concat(QPDFMatrix(1, 0, 0, 1, tx, ty));
}
void
QPDFMatrix::rotatex90(int angle)
{
switch (angle)
{
case 90:
concat(QPDFMatrix(0, 1, -1, 0, 0, 0));
break;
case 180:
concat(QPDFMatrix(-1, 0, 0, -1, 0, 0));
break;
case 270:
concat(QPDFMatrix(0, -1, 1, 0, 0, 0));
break;
default:
// ignore
break;
}
}
void
QPDFMatrix::transform(double x, double y, double& xp, double& yp)
{
xp = (this->a * x) + (this->c * y) + this->e;
yp = (this->b * x) + (this->d * y) + this->f;
}
QPDFObjectHandle::Rectangle
QPDFMatrix::transformRectangle(QPDFObjectHandle::Rectangle r)
{
// Transform a rectangle by creating a new rectangle the tightly
// bounds the polygon resulting from transforming the four
// corners.
std::vector<double> tx(4);
std::vector<double> ty(4);
transform(r.llx, r.lly, tx.at(0), ty.at(0));
transform(r.llx, r.ury, tx.at(1), ty.at(1));
transform(r.urx, r.lly, tx.at(2), ty.at(2));
transform(r.urx, r.ury, tx.at(3), ty.at(3));
return QPDFObjectHandle::Rectangle(
*std::min_element(tx.begin(), tx.end()),
*std::min_element(ty.begin(), ty.end()),
*std::max_element(tx.begin(), tx.end()),
*std::max_element(ty.begin(), ty.end()));
}
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