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/***************************************************************************
* This file is part of Robocut. *
* Copyright (C) 2010 Tim Hutt <tdhutt@gmail.com> *
* Copyright (C) 2010 Markus Schulz <schulz@alpharesearch.de> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "PathPaintEngine.h"
#include <cmath>
#include <QDebug>
PathPaintEngine::PathPaintEngine(QPaintDevice* pdev)
: QPaintEngine(AllFeatures)
{
dev = dynamic_cast<PathPaintDevice*>(pdev);
if (!dev)
qWarning("PathPaintEngine: unsupported target device.");
}
bool PathPaintEngine::begin(QPaintDevice* pdev)
{
dev = dynamic_cast<PathPaintDevice*>(pdev);
if (!dev)
qWarning("PathPaintEngine: unsupported target device.");
// TODO: setActive?
return true;
}
bool approximatelyEqual(qreal a, qreal b, qreal epsilon)
{
return fabs(a - b) <= ( (fabs(a) < fabs(b) ? fabs(b) : fabs(a)) * epsilon);
}
bool essentiallyEqual(qreal a, qreal b, qreal epsilon)
{
return fabs(a - b) <= ( (fabs(a) > fabs(b) ? fabs(b) : fabs(a)) * epsilon);
}
bool definitelyGreaterThan(qreal a, qreal b, qreal epsilon)
{
return (a - b) > ( (fabs(a) < fabs(b) ? fabs(b) : fabs(a)) * epsilon);
}
bool definitelyLessThan(qreal a, qreal b, qreal epsilon)
{
return (b - a) > ( (fabs(a) < fabs(b) ? fabs(b) : fabs(a)) * epsilon);
}
void PathPaintEngine::drawPath(const QPainterPath& path)
{
if (!dev)
return;
if(!isCosmetic)
{
QList<QPolygonF> polys = path.toSubpathPolygons();
for (int i = 0; i < polys.size(); ++i)
{
if(dashPattern.empty()) dev->addPath(transform.map(polys[i]));
else
{
QPolygonF polytemp = transform.map(polys[i]), newpoly;
int dashtoggle = 1, dashi=0, j = 0;
qreal actualdashsize = dashPattern[dashi];
QPointF origin = QPointF(polytemp[j]), testp;
j++;
do
{
newpoly = QPolygonF();
newpoly.append(origin);
do
{
testp = polytemp[j];
origin = QPointF(getPointAtLenght(QPointF(origin), polytemp[j], actualdashsize));
if (essentiallyEqual(origin.x(), polytemp[j].x(), 0.01 ) && approximatelyEqual(origin.y(), polytemp[j].y(),0.01) && j+1 < polytemp.size())
{
origin = polytemp[j];
int tempz = polytemp.size();
j++;
testp = polytemp[j];
}
newpoly.append(origin);
}while(definitelyGreaterThan(actualdashsize,0.0,0.1) && testp!=origin);
if(dashtoggle == 1)
{
dev->addPath(newpoly);
}
dashtoggle = dashtoggle * -1;
dashi++;
if(dashi >= dashPattern.size()) dashi=0;
actualdashsize = dashPattern[dashi];
}while(!essentiallyEqual(origin.x(), polytemp[j].x(), 0.001 ) || !essentiallyEqual(origin.y(), polytemp[j].y(),0.001));
}
}
}
}
void PathPaintEngine::drawPixmap(const QRectF& r, const QPixmap& pm, const QRectF& sr)
{
// Nop.
}
void PathPaintEngine::drawPolygon(const QPointF* points, int pointCount, PolygonDrawMode mode)
{
if (!dev)
return;
QPolygonF p;
for (int i = 0; i < pointCount; ++i)
p.append(points[i]);
dev->addPath(transform.map(p));
}
bool PathPaintEngine::end()
{
if (!dev)
return false;
return true;
}
QPaintEngine::Type PathPaintEngine::type() const
{
return QPaintEngine::User;
}
void PathPaintEngine::updateState(const QPaintEngineState& state)
{
if (state.state() & DirtyTransform)
transform = state.transform();
dashPattern = state.pen().dashPattern();
isCosmetic = state.pen().isCosmetic();
}
qreal PathPaintEngine::getDistance(const QPointF &p1, const QPointF &p2)
{
qreal testx1 = p1.x();
qreal testy1 = p1.y();
qreal testx2 = p2.x();
qreal testy2 = p2.y();
qreal a = 0.0;
qreal b = 0.0;
double c = 0.0;
if(testx1 >= testx2) a = testx1 - testx2;
else a = testx2 - testx1;
if(testy1 >= testy2) b = testy1 - testy2;
else b = testy2 - testy1;
c = sqrt((double)(a*a+b*b));
return (qreal) c;
}
QPointF PathPaintEngine::getPointAtLenght(const QPointF &p1, const QPointF &p2, qreal &l1)
{
qreal testx1 = p1.x();
qreal testy1 = p1.y();
qreal testx2 = p2.x();
qreal testy2 = p2.y();
qreal lenghtp1p2 = getDistance(p1,p2);
qreal lenghtdash = l1;
l1 = lenghtp1p2 - lenghtdash;
if (definitelyLessThan(lenghtp1p2, lenghtdash, 0.01))
{
l1 = lenghtdash - lenghtp1p2;
return p2;
}
if (definitelyGreaterThan(lenghtdash, lenghtp1p2, 0.01))
{
l1 = lenghtdash - lenghtp1p2;
return p1;
}
l1 = 0;
qreal factor = lenghtp1p2/lenghtdash;
qreal a = testx1-testx2;
qreal b = testy1-testy2;
qreal aa = a/factor;
qreal bb = b/factor;
QPointF ret = QPointF(testx1-aa,testy1-bb);
return ret;
}
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