VidePub Code

/*
   Copyright (C) 2011 Arnaud Champenois arthelion92@gmail.com

    This program 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.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "drawingarea.h"
#include <QPainter>
#include <QMouseEvent>

DrawingArea::DrawingArea(MainWindow *parent) :
    QWidget(parent)
{
mRubberPt = NULL;
mMainWindow = parent;
mInLogo = false;
mOptW = mOptH = 0;
mZoom = 1.0;
}

DrawingArea::~DrawingArea()
{
    delete mRubberPt;
}

void DrawingArea::mousePressEvent ( QMouseEvent * event )
{
    if(event->button() != Qt::LeftButton)
        return;
    if(mImage.isNull()) return;
    mInLogo  = true;
    mOrigin = event->pos();
    if (!mRubberPt)
        mRubberPt = new QRubberBand(QRubberBand::Rectangle, this);
    mRubberPt->setGeometry(QRect(mOrigin, QSize()));
    mRubberPt->show();
}

 bool DrawingArea::UnzoomLogoArea()
{
    if(mLogoArea.isValid())
    {
        double aZoomX = (double)mImage.width()/(double)mOptImage.width();
        double aZoomY = (double)mImage.height()/(double)mOptImage.height();

        int X1 = (int)floor((double)mLogoArea.topLeft().x()*aZoomX);
        int Y1 = (int)floor((double)mLogoArea.topLeft().y()*aZoomY);

        int X2 = (int)floor((double)mLogoArea.bottomRight().x()*aZoomX);
        int Y2 = (int)floor((double)mLogoArea.bottomRight().y()*aZoomY);

        mLogoArea.setCoords(X1,Y1,X2,Y2);
        return true;
    }
    return false;
}

 bool DrawingArea::ZoomLogoArea(QRect& aLogoArea)
{
    if(mLogoArea.isValid())
    {
        double aZoomX = (double)mOptImage.width()/(double)mImage.width();
        double aZoomY = (double)mOptImage.height()/(double)mImage.height();

        int X1 = (int)floor((double)mLogoArea.topLeft().x()*aZoomX);
        int Y1 = (int)floor((double)mLogoArea.topLeft().y()*aZoomY);

        int X2 = (int)floor((double)mLogoArea.bottomRight().x()*aZoomX);
        int Y2 = (int)floor((double)mLogoArea.bottomRight().y()*aZoomY);

        aLogoArea.setCoords(X1,Y1,X2,Y2);
        return true;
    }
    return false;
}

void DrawingArea::mouseReleaseEvent ( QMouseEvent * event )
{
    if(mImage.isNull() || mRubberPt == nullptr) return;

    mInLogo  = false;
    QRect anImageRect = mOptImage.rect();
    mLogoArea = anImageRect.intersected(QRect(mOrigin, event->pos()).normalized());
    mRubberPt->hide();

    if(UnzoomLogoArea())
        repaint();

    if(mLogoArea.width()>3 && mLogoArea.height()>3)
        mMainWindow->SetLogoAndSearch(mLogoArea,mImage.copy(mLogoArea));
}

void DrawingArea::mouseMoveEvent ( QMouseEvent * event )
{
    if(mOptImage.isNull() || mRubberPt == nullptr) return;

    QRect anImageRect = mOptImage.rect();
    anImageRect = anImageRect.intersected(QRect(mOrigin, event->pos()).normalized());
    mRubberPt->setGeometry(anImageRect);
}

void DrawingArea::paintEvent(QPaintEvent*)
{
  QPainter p(this);

  if(!mOptImage.isNull())
      p.drawImage(0,0,mOptImage);


  if(mMainWindow->HasLogo())
    {
      p.setPen(QColor(255,0,0));
      p.setBrush(QColor(255,0,0,50));
      QRect aLogoArea;
      ZoomLogoArea(aLogoArea);
      p.drawRect(aLogoArea);
    }
  else if(!mMainWindow->IsClosed() && !mInLogo)
  {
      p.setFont(QFont("Times",14,10,false));
      p.setPen(QColor(255,0,0));
      p.drawText(QRect(0,0,800,60),tr("Drag mouse pressing left button\nto select channel logo"));
  }
  else if(mMainWindow->IsClosed())
  {
      p.fillRect(0,0,width(),height(),QColor());
      p.setFont(QFont("Times",18,10,false));
      p.setPen(QColor(255,0,0));
      p.drawText(QRect(0,0,800,30),tr("Drop an mpeg ts video here"));
  }
}

void DrawingArea::SetImage(const QImage&anImage)
{
    mImage = anImage;
    SetOptImage();
}

void DrawingArea::GetDisplaySize(int &W,int&H)
{
    W = (int)floor((double)mOptW*mZoom);
    H = (int)floor((double)mOptH*mZoom);
}

void DrawingArea::SetOptImage()
{
    if(mOptW >0 && mOptH > 0 && !mImage.isNull())
    {
        int aW,aH;
        GetDisplaySize(aW,aH);
        mOptImage = mImage.scaled(aW,aH,Qt::IgnoreAspectRatio,Qt::SmoothTransformation);
    }
    else
        mOptImage = mImage;
    repaint();
}

void DrawingArea::SetZoom(double aZoom)
{
    mZoom = aZoom;
    if(mZoom>4.0) mZoom = 4.0;
    else if(mZoom<0.25) mZoom = 0.25;

    int aW,aH;
    GetDisplaySize(aW,aH);
    resize(aW,aH);
    SetOptImage();
}

bool DrawingArea::IncZoom()
{
    SetZoom(mZoom*1.5);
    if(mZoom >= 4.0) return false;
    else return true;
}

bool DrawingArea::DecZoom()
{
    SetZoom(mZoom/1.5);
    if(mZoom <= 0.25) return false;
    else return true;
}