Jim Evins
158 lines
3.2 KiB
C++
158 lines
3.2 KiB
C++
/* View.cpp
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*
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* Copyright (C) 2013 Jim Evins <evins@snaught.com>
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*
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* This file is part of gLabels-qt.
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*
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* gLabels-qt is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gLabels-qt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gLabels-qt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "View.h"
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#include <cmath>
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#include <iostream>
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namespace
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{
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const int nZoomLevels = 14;
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const double zoomLevels[nZoomLevels] = { 8, 6, 4, 3, 2, 1.5, 1, 0.75, 0.67, 0.50, 0.33, 0.25, 0.15, 0.10 };
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const double ZOOM_TO_FIT_PAD = 16;
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}
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namespace glabels
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{
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View::View( QWidget *parent ) : QGraphicsView(parent)
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{
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setZoomReal( 1, false );
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mModel = 0;
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mScene = new QGraphicsScene();
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setScene( mScene );
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}
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void View::setModel( LabelModel* model )
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{
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mModel = model;
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foreach (LabelModelObject* object, model->objectList() )
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{
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QGraphicsItem* item = object->createGraphicsItem();
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mScene->addItem( item );
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}
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}
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void View::zoomIn()
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{
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// Find closest standard zoom level to our current zoom
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// Start with 2nd largest scale
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int i_min = 1;
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double dist_min = fabs( zoomLevels[1] - mZoom );
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for ( int i = 2; i < nZoomLevels; i++ )
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{
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double dist = fabs( zoomLevels[i] - mZoom );
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if ( dist < dist_min )
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{
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i_min = i;
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dist_min = dist;
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}
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}
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// Zoom in one notch
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setZoomReal( zoomLevels[i_min-1], false );
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}
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void View::zoomOut()
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{
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// Find closest standard zoom level to our current zoom
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// Start with largest scale, end on 2nd smallest
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int i_min = 0;
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double dist_min = fabs( zoomLevels[0] - mZoom );
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for ( int i = 1; i < (nZoomLevels-1); i++ )
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{
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double dist = fabs( zoomLevels[i] - mZoom );
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if ( dist < dist_min )
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{
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i_min = i;
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dist_min = dist;
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}
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}
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// Zoom out one notch
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setZoomReal( zoomLevels[i_min+1], false );
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}
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void View::zoom1To1()
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{
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setZoomReal( 1.0, false );
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}
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void View::zoomToFit()
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{
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double x_scale = (72.0/physicalDpiY()) * ( width() - ZOOM_TO_FIT_PAD ) / mModel->w();
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double y_scale = (72.0/physicalDpiY()) * ( height() - ZOOM_TO_FIT_PAD ) / mModel->h();
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double newZoom = min( x_scale, y_scale );
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// Limits
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newZoom = min( newZoom, zoomLevels[0] );
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newZoom = max( newZoom, zoomLevels[nZoomLevels-1] );
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setZoomReal( newZoom, true );
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}
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bool View::isZoomMax() const
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{
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return ( mZoom >= zoomLevels[0] );
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}
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bool View::isZoomMin() const
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{
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return ( mZoom <= zoomLevels[nZoomLevels-1] );
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}
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void View::setZoomReal( double zoom, bool zoomToFitFlag )
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{
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mZoom = zoom;
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mZoomToFitFlag = zoomToFitFlag;
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resetTransform();
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scale( mZoom*physicalDpiX()/72.0, mZoom*physicalDpiY()/72.0 );
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emit zoomChanged();
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}
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void View::resizeEvent( QResizeEvent *event )
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{
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if ( mZoomToFitFlag )
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{
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zoomToFit();
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}
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}
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}
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