eseventaddellipse.cpp

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/*
    Copyright 2006-2019 The QElectroTech Team
    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 <QObject>

#include "eseventaddellipse.h"
#include "partellipse.h"
#include "editorcommands.h"
#include "elementscene.h"

ESEventAddEllipse::ESEventAddEllipse(ElementScene *scene) :
    ESEventInterface(scene),
    m_ellipse(nullptr)
{}

ESEventAddEllipse::~ESEventAddEllipse() {
    if (m_running || m_abort){
        delete m_ellipse;
    }
}

bool ESEventAddEllipse::mousePressEvent(QGraphicsSceneMouseEvent *event) {
    if (event -> button() == Qt::LeftButton) {
        if(!m_running) m_running = true;
        QPointF pos = m_scene->snapToGrid(event -> scenePos());

            //create new ellpise
        if (!m_ellipse) {
            m_ellipse = new PartEllipse(m_editor);
            m_scene -> addItem(m_ellipse);
            m_ellipse -> setPos(pos);
            m_origin = m_new_pos = pos;
            return true;
        }

            //Add ellipse to scene
        m_ellipse -> setRect(m_ellipse -> rect().normalized());
        m_scene -> undoStack().push(new AddPartCommand(QObject::tr("Ellipse"), m_scene, m_ellipse));

            //Set m_ellipse to nullptr for create new ellipse at next mouse press
        m_ellipse = nullptr;

        return true;
    }
    return false;
}

bool ESEventAddEllipse::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
    updateHelpCross(event -> scenePos());
    if (!m_ellipse) return false;

    QPointF pos = m_scene -> snapToGrid(event -> scenePos());
    if (pos == m_new_pos) return true;
    m_new_pos = pos;

    qreal width  = (m_new_pos.x() - m_origin.x())*2;
    qreal height = (m_new_pos.y() - m_origin.y())*2;
        //calculates the position of the rectangle so that its center is at position (0,0) of m_ellipse
    QPointF center(-width/2, -height/2);

    m_ellipse -> setRect(QRectF(center, QSizeF(width, height)));
    return true;
}

bool ESEventAddEllipse::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
    if (event -> button() == Qt::RightButton) {
        if (m_ellipse) {delete m_ellipse; m_ellipse = nullptr;}
        else        {m_running = false;}
        return true;
    }
    return false;
}