MyQGraphicsView.cpp
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00001 /*
00002  * Copyright (c) 2009, CoroWare
00003  * All rights reserved.
00004  * 
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions are met:
00007  * 
00008  *     * Redistributions of source code must retain the above copyright
00009  *       notice, this list of conditions and the following disclaimer.
00010  *     * Redistributions in binary form must reproduce the above copyright
00011  *       notice, this list of conditions and the following disclaimer in the
00012  *       documentation and/or other materials provided with the distribution.
00013  *     * Neither the name of the Willow Garage, Stanford U. nor the names of its
00014  *       contributors may be used to endorse or promote products derived from
00015  *       this software without specific prior written permission.
00016  * 
00017  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00021  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027  * POSSIBILITY OF SUCH DAMAGE.
00028  */
00029 
00030 #include "MyQGraphicsView.h"
00031 
00032 void MyQGraphicsView::wheelEvent ( QWheelEvent * event )
00033 {
00034     int numDegrees = event->delta() / 8;
00035     int numSteps = numDegrees / 15;  // see QWheelEvent documentation
00036     _numScheduledScalings += numSteps;
00037     if (_numScheduledScalings * numSteps < 0)  // if user moved the wheel in another direction, we reset previously scheduled scalings
00038         _numScheduledScalings = numSteps;
00039  
00040     QTimeLine *anim = new QTimeLine(350, this);
00041     anim->setUpdateInterval(50);
00042  
00043     connect(anim, SIGNAL(valueChanged(qreal)), SLOT(scalingTime(qreal)));
00044     connect(anim, SIGNAL(finished()), SLOT(animFinished()));
00045     anim->start();
00046 }
00047 
00048 void MyQGraphicsView::scalingTime(qreal x)
00049 {
00050     qreal factor = 1.0 + qreal(_numScheduledScalings) / 300.0;
00051     scale_factor *= factor;
00052 
00053   /*  if(scale_factor < 1.0)
00054         {
00055                 scale_factor /= factor;
00056                 if(_numScheduledScalings > 0)
00057                         _numScheduledScalings--;
00058                 else if(_numScheduledScalings <0)
00059                         _numScheduledScalings++;
00060         }
00061         else
00062         {*/             
00063                 scale(factor, factor);
00064         //}
00065 }
00066 
00067 void MyQGraphicsView::animFinished()
00068 {
00069     if (_numScheduledScalings > 0)
00070         _numScheduledScalings--;
00071     else
00072         _numScheduledScalings++;
00073     sender()->~QObject();
00074 }
00075 
00076 MyQGraphicsView::MyQGraphicsView(QWidget* widget): QGraphicsView (widget)
00077 {
00078         _numScheduledScalings = 0;
00079         scale_factor = 1.0;
00080 }


corobot_teleop
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autogenerated on Sun Oct 5 2014 23:18:16