global.cpp

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/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2017  Seamly, LLC                                       *
 *                                                                         *
 *   https://github.com/fashionfreedom/seamly2d                             *
 *                                                                         *
 ***************************************************************************
 **
 **  Seamly2D 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.
 **
 **  Seamly2D 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 Seamly2D.  If not, see <http://www.gnu.org/licenses/>.
 **
 **************************************************************************
 
 ************************************************************************
 **
 **  @file
 **  @author Roman Telezhynskyi <dismine(at)gmail.com>
 **  @date   14 6, 2017
 **
 **  @brief
 **  @copyright
 **  This source code is part of the Valentine project, a pattern making
 **  program, whose allow create and modeling patterns of clothing.
 **  Copyright (C) 2017 Seamly2D project
 **  <https://github.com/fashionfreedom/seamly2d> All Rights Reserved.
 **
 **  Seamly2D 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.
 **
 **  Seamly2D 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 Seamly2D.  If not, see <http://www.gnu.org/licenses/>.
 **
 *************************************************************************/
 
#include "global.h"
#include "../vmisc/def.h"
 
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsView>
 
const qreal defPointRadiusPixel = (2./*mm*/ / 25.4) * PrintDPI;
const qreal widthMainLine = (1.2/*mm*/ / 25.4) * PrintDPI;
const qreal widthHairLine = widthMainLine/3.0;
 
qreal sceneScale(QGraphicsScene *scene)
{
    qreal scale = 1;
 
    if (scene)
    {
        const QList<QGraphicsView *> views = scene->views();
        if (not views.isEmpty())
        {
            scale = views.first()->transform().m11();
        }
    }
 
    return scale;
}
 
//---------------------------------------------------------------------------------------------------------------------
QColor correctColor(const QGraphicsItem *item, const QColor &color)
{
    SCASSERT(item != nullptr)
 
    if (item->isEnabled())
    {
        return color;
    }
    else
    {
        return Qt::gray;
    }
}
 
//---------------------------------------------------------------------------------------------------------------------
QRectF PointRect(qreal radius)
{
    QRectF rec = QRectF(0, 0, radius*2, radius*2);
    rec.translate(-rec.center().x(), -rec.center().y());
    return rec;
}
 
//---------------------------------------------------------------------------------------------------------------------
qreal scaledRadius(qreal scale)
{
    qreal scaledRadius = defPointRadiusPixel;
    if (scale > 1)
    {
        scaledRadius = qMax(defPointRadiusPixel/96, defPointRadiusPixel/scale);
    }
    return scaledRadius;
}
 
//---------------------------------------------------------------------------------------------------------------------
void scaleCircleSize(QGraphicsEllipseItem *item, qreal scale)
{
    SCASSERT(item != nullptr)
 
    item->setRect(PointRect(scaledRadius(scale)));
}
 
//---------------------------------------------------------------------------------------------------------------------
void scaleRectSize(QGraphicsRectItem *item, qreal scale)
{
    SCASSERT(item != nullptr)
 
    item->setRect(PointRect(scaledRadius(scale)));
}
 
//---------------------------------------------------------------------------------------------------------------------
qreal scaleWidth(qreal width, qreal scale)
{
    if (scale > 1)
    {
        width = qMax(0.01, width/scale);
    }
    return width;
}
 
//---------------------------------------------------------------------------------------------------------------------
QPainterPath ItemShapeFromPath(const QPainterPath &path, const QPen &pen)
{
    // We unfortunately need this hack as QPainterPathStroker will set a width of 1.0
    // if we pass a value of 0.0 to QPainterPathStroker::setWidth()
    const qreal penWidthZero = qreal(0.00000001);
 
    if (path == QPainterPath() || pen == Qt::NoPen)
    {
        return path;
    }
    QPainterPathStroker ps;
    ps.setCapStyle(pen.capStyle());
    if (pen.widthF() <= 0.0)
    {
        ps.setWidth(penWidthZero);
    }
    else
    {
        ps.setWidth(pen.widthF());
    }
    ps.setJoinStyle(pen.joinStyle());
    ps.setMiterLimit(pen.miterLimit());
    QPainterPath p = ps.createStroke(path);
    p.addPath(path);
    return p;
}