/*
	Copyright 2006-2012 Xavier Guerrin
	This file is part of QElectroTech.
	
	QElectroTech 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 2 of the License, or
	(at your option) any later version.
	
	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "partcircle.h"

/**
	Constructeur
	@param editor L'editeur d'element concerne
	@param parent Le QGraphicsItem parent de ce cercle
	@param scene La scene sur laquelle figure ce cercle
*/
PartCircle::PartCircle(QETElementEditor *editor, QGraphicsItem *parent, QGraphicsScene *scene) : QGraphicsEllipseItem(parent, scene), CustomElementGraphicPart(editor) {
	setFlags(QGraphicsItem::ItemIsSelectable);
#if QT_VERSION >= 0x040600
	setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
#endif
	setAcceptedMouseButtons(Qt::LeftButton);
}

/// Destructeur
PartCircle::~PartCircle() {
}

/**
	Dessine le cercle
	@param painter QPainter a utiliser pour rendre le dessin
	@param options Options pour affiner le rendu
	@param widget Widget sur lequel le rendu est effectue
*/
void PartCircle::paint(QPainter *painter, const QStyleOptionGraphicsItem *options, QWidget *widget) {
	Q_UNUSED(widget);
	applyStylesToQPainter(*painter);
	QPen t = painter -> pen();
	t.setCosmetic(options && options -> levelOfDetail < 1.0);
	if (isSelected()) {
		t.setColor(Qt::red);
	}
	painter -> setPen(t);
	painter -> drawEllipse(rect());
	if (isSelected()) {
		painter -> setRenderHint(QPainter::Antialiasing, false);
		painter -> setPen((painter -> brush().color() == QColor(Qt::black) && painter -> brush().isOpaque()) ? Qt::yellow : Qt::blue);
		QPointF center = rect().center();
		painter -> drawLine(QLineF(center.x() - 2.0, center.y(), center.x() + 2.0, center.y()));
		painter -> drawLine(QLineF(center.x(), center.y() - 2.0, center.x(), center.y() + 2.0));
	}
}

/**
	Exporte le cercle en XML
	@param xml_document Document XML a utiliser pour creer l'element XML
	@return un element XML decrivant le cercle
*/
const QDomElement PartCircle::toXml(QDomDocument &xml_document) const {
	QDomElement xml_element = xml_document.createElement("circle");
	QPointF top_left(sceneTopLeft());
	xml_element.setAttribute("x", QString("%1").arg(top_left.x()));
	xml_element.setAttribute("y", QString("%1").arg(top_left.y()));
	xml_element.setAttribute("diameter",  QString("%1").arg(rect().width()));
	stylesToXml(xml_element);
	return(xml_element);
}

/**
	Importe les proprietes d'un cercle depuis un element XML
	@param qde Element XML a lire
*/
void PartCircle::fromXml(const QDomElement &qde) {
	stylesFromXml(qde);
	qreal diameter = qde.attribute("diameter",  "0").toDouble();
	setRect(
		QRectF(
			mapFromScene(
				qde.attribute("x", "0").toDouble(),
				qde.attribute("y", "0").toDouble()
			),
			QSizeF(
				diameter,
				diameter
			)
		)
	);
}

/**
	Specifie la valeur d'une propriete donnee du cercle
	@param property propriete a modifier. Valeurs acceptees :
		* x : abscisse du centre du cercle
		* y : ordonnee du centre du cercle
		* diameter : diametre du cercle
	@param value Valeur a attribuer a la propriete
*/
void PartCircle::setProperty(const QString &property, const QVariant &value) {
	CustomElementGraphicPart::setProperty(property, value);
	if (!value.canConvert(QVariant::Double)) return;
	if (property == "x") {
		QRectF current_rect = rect();
		QPointF current_pos = mapToScene(current_rect.center());
		setRect(current_rect.translated(value.toDouble() - current_pos.x(), 0.0));
	} else if (property == "y") {
		QRectF current_rect = rect();
		QPointF current_pos = mapToScene(current_rect.center());
		setRect(current_rect.translated(0.0, value.toDouble() - current_pos.y()));
	} else if (property == "diameter") {
		QRectF current_rect = rect();
		qreal new_diameter = qAbs(value.toDouble());
		current_rect.translate(
			(new_diameter - current_rect.width()) / -2.0,
			(new_diameter - current_rect.height()) / -2.0
		);
		current_rect.setSize(QSizeF(new_diameter, new_diameter));
		setRect(current_rect);
	}
	update();
}

/**
	Permet d'acceder a la valeur d'une propriete de style donnee.
	@param property propriete lue. Valeurs acceptees :
		* x : abscisse du centre du cercle
		* y : ordonnee du centre du cercle
		* diameter : diametre du cercle
	@return La valeur de la propriete property
*/
QVariant PartCircle::property(const QString &property) {
	// appelle la methode property de CustomElementGraphicpart pour les styles
	QVariant style_property = CustomElementGraphicPart::property(property);
	if (style_property != QVariant()) return(style_property);
	
	if (property == "x") {
		return(mapToScene(rect().center()).x());
	} else if (property == "y") {
		return(mapToScene(rect().center()).y());
	} else if (property == "diameter") {
		return(rect().width());
	}
	return(QVariant());
}

/**
	Gere les changements intervenant sur cette partie
	@param change Type de changement
	@param value Valeur numerique relative au changement
*/
QVariant PartCircle::itemChange(GraphicsItemChange change, const QVariant &value) {
	if (scene()) {
		if (change == QGraphicsItem::ItemPositionChange || change == QGraphicsItem::ItemPositionHasChanged) {
			updateCurrentPartEditor();
		}
	}
	return(QGraphicsEllipseItem::itemChange(change, value));
}

/**
	@return le coin superieur gauche du rectangle dans lequel s'inscrit
	le cercle, dans les coordonnees de la scene.
*/
QPointF PartCircle::sceneTopLeft() const {
	return(mapToScene(rect().topLeft()));
}

/**
	@return le centre du cercle, dans les coordonnees de la scene.
*/
QPointF PartCircle::sceneCenter() const {
	return(mapToScene(rect().center()));
}

/**
	@return le rectangle delimitant cette partie.
*/
QRectF PartCircle::boundingRect() const {
	qreal adjust = 1.5;
	QRectF r(QGraphicsEllipseItem::boundingRect());
	r.adjust(-adjust, -adjust, adjust, adjust);
	return(r);
}

/**
	@return true si cette partie n'est pas pertinente et ne merite pas d'etre
	conservee / enregistree.
	Un cercle est pertinent des lors que son rayon n'est pas nul
*/
bool PartCircle::isUseless() const {
	return(rect().isNull());
}

/**
	@return the minimum, margin-less rectangle this part can fit into, in scene
	coordinates. It is different from boundingRect() because it is not supposed
	to imply any margin, and it is different from shape because it is a regular
	rectangle, not a complex shape.
*/
QRectF PartCircle::sceneGeometricRect() const {
	return(mapToScene(rect()).boundingRect());
}

/**
	Start the user-induced transformation, provided this primitive is contained
	within the \a initial_selection_rect bounding rectangle.
*/
void PartCircle::startUserTransformation(const QRectF &initial_selection_rect) {
	Q_UNUSED(initial_selection_rect)
	saved_center_ = mapToScene(rect().center());
	saved_diameter_ = rect().width();
}

/**
	Handle the user-induced transformation from \a initial_selection_rect to \a new_selection_rect
*/
void PartCircle::handleUserTransformation(const QRectF &initial_selection_rect, const QRectF &new_selection_rect) {
	QPointF new_center = mapPoints(initial_selection_rect, new_selection_rect, QList<QPointF>() << saved_center_).first();
	
	qreal sx = new_selection_rect.width() / initial_selection_rect.width();
	qreal sy = new_selection_rect.height() / initial_selection_rect.height();
	qreal smallest_scale_factor = sx > sy ? sy : sx;
	qreal new_diameter = saved_diameter_ * smallest_scale_factor;
	
	QRectF new_rect(QPointF(), QSizeF(new_diameter, new_diameter));
	new_rect.moveCenter(mapFromScene(new_center));
	
	setRect(new_rect);
}