ImageDialog.cc

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#include "ImageDialog.hh"

#include <iostream>

#include <QPainter>

ImageDialog::ImageDialog(QImage _image, QWidget *parent) :
        QDialog(parent),
        imageWidth_(_image.width() ),
        imageHeight_(_image.height() ),
        dragging_(false)
{
  setupUi(this);

  pixmap_ = QPixmap::fromImage(_image).scaled(QSize(400,400),Qt::KeepAspectRatio,Qt::SmoothTransformation);

  image->setPixmap(pixmap_);

  // Set the correct boundaries for the spinboxes
  minX->setMaximum(imageWidth_);
  maxX->setMaximum(imageWidth_);
  maxX->setValue(imageWidth_);
  minY->setMaximum(imageHeight_);
  maxY->setMaximum(imageHeight_);
  maxY->setValue(imageHeight_);

  // Connect the spin boxes
  connect(minX,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
  connect(maxX,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
  connect(minY,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
  connect(maxY,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));

  connect(image,SIGNAL(mouseButtonMoveEvent ( QPoint ))   ,this,SLOT(mouseButtonMoveEvent ( QPoint )));
  connect(image,SIGNAL(mouseButtonPressEvent ( QPoint ))  ,this,SLOT(mouseButtonPressEvent ( QPoint )));
  connect(image,SIGNAL(mouseButtonReleaseEvent ( QPoint )),this,SLOT(mouseButtonReleaseEvent ( QPoint )));

  setMouseTracking ( true);

}


void ImageDialog::slidersChanged() {

  // Copy to internal buffer
  buffer_ = pixmap_;

  QPainter painter( &buffer_);

  QPen pen(Qt::red);

  pen.setWidth(2);
  painter.setPen( pen );

  painter.setBrush(QBrush(Qt::red,Qt::NoBrush));

  const int minXVal = minX->value();
  const int maxXVal = maxX->value();
  const int minYVal = minY->value();
  const int maxYVal = maxY->value();

  // Calculate the scaling factor that is used to fit the image to the widget
  const double scale = (double)pixmap_.width() / (double)imageWidth_;

  // Working on the actual pixmap -> no offsets!
  painter.drawRect( minXVal * scale  , minYVal  * scale , (maxXVal-minXVal)  * scale, (maxYVal-minYVal)  * scale);

  painter.end();

  image->setPixmap(buffer_);
}

void ImageDialog::mouseButtonMoveEvent ( QPoint _p) {
  if ( dragging_ ) {

    // Calculate the right values for the position.
    // The image is scaled to 400x400
    // But the aspect ratio is kept. So we need to calculate the new sizes.



    // Calculate the free space above and before the real image
    // As we are working on the pixmap widget, we need to consider these offsets to calculate
    // coordinates inside the real pixmap.
    #if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
       int xoffset = (400 - image->pixmap()->width() ) / 2;
       int yoffset = (400 - image->pixmap()->height()) / 2;
    #else
      int xoffset = (400 - image->pixmap(Qt::ReturnByValue).width() ) / 2;
      int yoffset = (400 - image->pixmap(Qt::ReturnByValue).height()) / 2;
    #endif


    // Calculate the scaling factor that is used to fit the image to the widget

    #if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
        const double scale = (double)imageWidth_ / (double)image->pixmap()->width();
    #else
        const double scale = (double)imageWidth_ / (double)image->pixmap(Qt::ReturnByValue).width();
    #endif


    int newXMin = (std::min(dragStartPoint_.x(),_p.x()) - xoffset ) * scale;
    int newXMax = (std::max(dragStartPoint_.x(),_p.x()) - xoffset ) * scale;

    int newYMin = (std::min(dragStartPoint_.y(),_p.y()) - yoffset ) * scale;
    int newYMax = (std::max(dragStartPoint_.y(),_p.y()) - yoffset ) * scale;

    minX->blockSignals(true);
    maxX->blockSignals(true);
    minY->blockSignals(true);
    maxY->blockSignals(true);

    minX->setValue(newXMin);
    maxX->setValue(newXMax);
    minY->setValue(newYMin);
    maxY->setValue(newYMax);

    minX->blockSignals(false);
    maxX->blockSignals(false);
    minY->blockSignals(false);
    maxY->blockSignals(false);

    slidersChanged();
  }
}

void ImageDialog::mouseButtonPressEvent (  QPoint _p ) {
  dragStartPoint_ = _p;
  dragging_       = true;
}

void ImageDialog::mouseButtonReleaseEvent (  QPoint _p ) {
  dragging_ = false;
}