valentina/widgets/vcontrolpointspline.cpp

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/****************************************************************************
**
** Copyright (C) 2013 Valentina project All Rights Reserved.
**
** This file is part of Valentina.
**
** Tox 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.
**
** Valentina 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 Valentina. If not, see <http://www.gnu.org/licenses/>.
**
****************************************************************************/
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#include "vcontrolpointspline.h"
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VControlPointSpline::VControlPointSpline(const qint32 &indexSpline, SplinePoint::Position position,
const QPointF &controlPoint, const QPointF &splinePoint,
QGraphicsItem *parent)
:QGraphicsEllipseItem(parent), radius(toPixel(1.5)), controlLine(0), indexSpline(indexSpline), position(position)
{
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//create circle
QRectF rec = QRectF(0, 0, radius*2, radius*2);
rec.translate(-rec.center().x(), -rec.center().y());
this->setRect(rec);
this->setPen(QPen(Qt::black, widthHairLine));
this->setBrush(QBrush(Qt::NoBrush));
this->setFlag(QGraphicsItem::ItemIsSelectable, true);
this->setFlag(QGraphicsItem::ItemIsMovable, true);
this->setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
this->setAcceptHoverEvents(true);
this->setPos(controlPoint);
//Лінія, що з'єднує дві точки
QPointF p1, p2;
LineIntersectCircle(QPointF(), radius, QLineF( QPointF(), splinePoint-controlPoint), p1, p2);
controlLine = new QGraphicsLineItem(QLineF(splinePoint-controlPoint, p1), this);
controlLine->setPen(QPen(Qt::red, widthHairLine));
controlLine->setFlag(QGraphicsItem::ItemStacksBehindParent, true);
}
void VControlPointSpline::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
{
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Q_UNUSED(event);
this->setPen(QPen(Qt::black, widthMainLine));
}
void VControlPointSpline::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
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Q_UNUSED(event);
this->setPen(QPen(Qt::black, widthHairLine));
}
QVariant VControlPointSpline::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value)
{
if (change == ItemPositionChange && scene())
{
// value - new position.
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QPointF newPos = value.toPointF();
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emit ControlPointChangePosition(indexSpline, position, newPos);
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}
return QGraphicsItem::itemChange(change, value);
}
qint32 VControlPointSpline::LineIntersectCircle(QPointF center, qreal radius, QLineF line, QPointF &p1,
QPointF &p2) const
{
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const qreal eps = 1e-8;
//коефіцієнти для рівняння відрізку
qreal a = line.p2().y() - line.p1().y();
qreal b = line.p1().x() - line.p2().x();
// В даному випадку не використовується.
//qreal c = - a * line.p1().x() - b * line.p1().y();
// проекция центра окружности на прямую
QPointF p = ClosestPoint (line, center);
// сколько всего решений?
qint32 flag = 0;
qreal d = QLineF (center, p).length();
if (qAbs (d - radius) <= eps)
{
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flag = 1;
}
else
{
if (radius > d)
{
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flag = 2;
}
else
{
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return 0;
}
}
// находим расстояние от проекции до точек пересечения
qreal k = sqrt (radius * radius - d * d);
qreal t = QLineF (QPointF (0, 0), QPointF (b, - a)).length();
// добавляем к проекции векторы направленные к точкам пеерсечения
p1 = addVector (p, QPointF (0, 0), QPointF (- b, a), k / t);
p2 = addVector (p, QPointF (0, 0), QPointF (b, - a), k / t);
return flag;
}
QPointF VControlPointSpline::ClosestPoint(QLineF line, QPointF p) const
{
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QLineF lineP2pointFrom = QLineF(line.p2(), p);
qreal angle = 180-line.angleTo(lineP2pointFrom)-90;
QLineF pointFromlineP2 = QLineF(p, line.p2());
pointFromlineP2.setAngle(pointFromlineP2.angle()+angle);
QPointF point;
QLineF::IntersectType type = pointFromlineP2.intersect(line, &point);
if ( type == QLineF::BoundedIntersection )
{
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return point;
}
else
{
if ( type == QLineF::NoIntersection || type == QLineF::UnboundedIntersection )
{
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Q_ASSERT_X(type != QLineF::BoundedIntersection, Q_FUNC_INFO, "Немає точки перетину.");
return point;
}
}
return point;
}
QPointF VControlPointSpline::addVector(QPointF p, QPointF p1, QPointF p2, qreal k) const
{
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return QPointF (p.x() + (p2.x() - p1.x()) * k, p.y() + (p2.y() - p1.y()) * k);
}
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void VControlPointSpline::RefreshLine(const qint32 &indexSpline, SplinePoint::Position pos,
const QPointF &controlPoint, const QPointF &splinePoint)
{
if (this->indexSpline == indexSpline && this->position == pos)
{
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QPointF p1, p2;
LineIntersectCircle(QPointF(), radius, QLineF( QPointF(), splinePoint-controlPoint), p1, p2);
controlLine->setLine(QLineF(splinePoint-controlPoint, p1));
}
}
void VControlPointSpline::setEnabledPoint(bool enable)
{
if (enable == true)
{
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this->setPen(QPen(Qt::black, widthHairLine));
this->setFlag(QGraphicsItem::ItemIsSelectable, true);
this->setFlag(QGraphicsItem::ItemIsMovable, true);
this->setAcceptHoverEvents(true);
}
else
{
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this->setPen(QPen(Qt::gray, widthHairLine));
this->setFlag(QGraphicsItem::ItemIsSelectable, false);
this->setFlag(QGraphicsItem::ItemIsMovable, false);
this->setAcceptHoverEvents(false);
}
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}