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;
}