eseventaddarc.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 "elementscene.h"
#include "partarc.h"
#include "editorcommands.h"
#include "eseventaddarc.h"

ESEventAddArc::ESEventAddArc(ElementScene *scene) :
    ESEventInterface(scene),
    m_arc(nullptr),
    m_inverted(false)
{}

ESEventAddArc::~ESEventAddArc() {
    if (m_running || m_abort)
        delete m_arc;
}

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

            //create new arc
        if (!m_arc)
        {
            m_arc = new PartArc(m_editor);
            m_scene -> addItem(m_arc);
            m_arc -> setPos(pos);
            m_arc -> setProperty("startAngle", 0);
            m_arc -> setProperty("spanAngle", 1440);
            m_arc -> setProperty("antialias", true);
            m_origin = pos;
            return true;
        }

            //At this point, m_arc is finish, we add it with an undo command
        m_arc -> setRect(m_arc->rect().normalized());
        m_scene -> undoStack().push(new AddPartCommand(QObject::tr("Arc"), m_scene, m_arc));

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

        return true;
    }

    return false;
}

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

    m_mouse_pos = m_scene -> snapToGrid(event -> scenePos());
    updateArc();

    return true;
}

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

bool ESEventAddArc::keyPressEvent(QKeyEvent *event) {
    if (m_arc && event->key() == Qt::Key_Space) {
        m_inverted = m_inverted ? false : true;
        updateArc();
        return true;
    }

    return (ESEventInterface::keyPressEvent(event));
}

void ESEventAddArc::updateArc()
{
    qreal width  = (m_mouse_pos.x() - m_origin.x())*2;
    if (width < 0) width *= -1;
    qreal height = (m_mouse_pos.y() - m_origin.y())*2;
    if (height < 0) height *= -1;

    QPointF pos_ = m_arc -> mapFromScene(m_origin);

    //Draw arc inverted
    if (m_inverted)
    {
        //Adjust the start angle to be snapped at the origin point of draw
        if (m_mouse_pos.y() > m_origin.y())
        {
            if (m_mouse_pos.x() > m_origin.x())
            {
                pos_.ry() -= height/2;
                m_arc->setStartAngle(2880);
            }
            else
            {
                pos_.rx() -= width/2;
                m_arc->setStartAngle(1440);
            }
        }
        else
        {
            if (m_mouse_pos.x() > m_origin.x())
            {
                pos_.ry() -= height;
                pos_.rx() -= width/2;
                m_arc->setStartAngle(4320);
            }
            else
            {
                pos_.rx() -= width;
                pos_.ry() -= height/2;
                m_arc->setStartAngle(0);
            }
        }
    }
        //Draw arc non inverted
    else
    {
            //Adjust the start angle to be snapped at the origin point of draw
        if (m_mouse_pos.y() > m_origin.y())
        {
            if (m_mouse_pos.x() > m_origin.x())
            {
                pos_.rx() -= width/2;
                m_arc->setStartAngle(0);
            }
            else
            {
                pos_.rx() -= width;
                pos_.ry() -= height/2;
                m_arc->setStartAngle(4320);
            }
        }
        else
        {
            if (m_mouse_pos.x() > m_origin.x())
            {
                pos_.ry() -= height/2;
                m_arc->setStartAngle(1440);
            }
            else
            {
                pos_.rx() -= width/2;
                pos_.ry() -= height;
                m_arc->setStartAngle(2880);
            }
        }
    }

    m_arc -> setRect(QRectF(pos_, QSizeF(width, height)));
}