valentina/widgets/vcontrolpointspline.cpp

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2013-08-05 10:37:56 +02:00
#include "vcontrolpointspline.h"
#include <QPen>
#include <QBrush>
#include <QGraphicsScene>
#include <QDebug>
VControlPointSpline::VControlPointSpline(const QPointF &controlPoint, const QPointF &splinePoint,
QGraphicsItem *parent):QGraphicsEllipseItem(parent){
radius = 1.5*PrintDPI/25.4;
//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){
Q_UNUSED(event);
this->setPen(QPen(Qt::black, widthMainLine));
}
void VControlPointSpline::hoverLeaveEvent(QGraphicsSceneHoverEvent *event){
Q_UNUSED(event);
this->setPen(QPen(Qt::black, widthHairLine));
}
QVariant VControlPointSpline::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value){
if (change == ItemPositionChange && scene()) {
// value - это новое положение.
QPointF newPos = value.toPointF();
qDebug()<<this->rect();
QRectF rect = scene()->sceneRect();
if (!rect.contains(newPos)) {
// Сохраняем элемент внутри прямоугольника сцены.
newPos.setX(qMin(rect.right(), qMax(newPos.x(), rect.left())));
newPos.setY(qMin(rect.bottom(), qMax(newPos.y(), rect.top())));
emit ControlPointChangePosition(newPos);
return newPos;
}
emit ControlPointChangePosition(newPos);
}
return QGraphicsItem::itemChange(change, value);
}
qint32 VControlPointSpline::LineIntersectCircle(QPointF center, qreal radius, QLineF line, QPointF &p1,
QPointF &p2) const{
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){
flag = 1;
} else {
if (radius > d){
flag = 2;
} else {
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{
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 ){
return point;
} else{
if ( type == QLineF::NoIntersection || type == QLineF::UnboundedIntersection ){
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{
return QPointF (p.x() + (p2.x() - p1.x()) * k, p.y() + (p2.y() - p1.y()) * k);
}
void VControlPointSpline::RefreshLine(const QPointF &controlPoint, const QPointF &splinePoint){
// QRectF rec = QRectF(0, 0, radius*2, radius*2);
// rec.translate(0-rec.center().x(), 0-rec.center().y());
// this->setRect(rec);
QPointF p1, p2;
LineIntersectCircle(QPointF(), radius, QLineF( QPointF(), splinePoint-controlPoint), p1, p2);
controlLine->setLine(QLineF(splinePoint-controlPoint, p1));
}