Paint Rect visible on Drag to crop image coordinate

[patrik08]

PS: my first QPainter not run...

I made a extra QWidget scaled on ratio image... to display a red rect to crop a simple image....


but now this paint is visible only if i resize the widged :-(



Or must i attach other event on drag???

I wand this rect visible on drag mesure to select crop image ....

void Image_Operator::paintEvent(QPaintEvent *e)
{
 
    if (display.isNull()) {
    qDebug() << "### display pixmap broken!!!! " << display.isNull();
    return;
    }
    qDebug() << "### paintEvent go starter...... ";
    Load_Actual_Desktop();  /* widget size setting e resolution X11 */
    int hi_now = widgetSize.height();
    int wi_now = widgetSize.width();
    picscaled = display.scaled(wi_now,hi_now,Qt::KeepAspectRatio);   /* scaled to widget displayer */
    QSize actual_result = picscaled.size();  /* get */
    Ratio_On_Work(actual_result);
    QPainter painter(this);
    painter.drawPixmap(0,0,picscaled);
    QString selectionText;
    selectionText = QString("Image %1 x %2").arg(actual_result.width()).arg(actual_result.height());
 
      QFontMetrics fm( this->font() );
      int stringWidth = fm.width(selectionText);
      int stringHeight = fm.ascent();
      const int TEXT_MARGIN = 4;
 
    /* color to pen */
    QColor textColor = Qt::black;
    QColor fillrectcolor = Qt::red;
 
      int textX = 0;
      int textY = 0;
 
      /* display rect mesure  image crop !!! */
      QPoint topLeft( QMIN(mousePRESSPoint.x(), mouseRELEASEPoint.x()),
                      QMIN(mousePRESSPoint.y(), mouseRELEASEPoint.y()) );
      QPoint bottomRight( QMAX(mousePRESSPoint.x(), mouseRELEASEPoint.x()),
                        QMAX(mousePRESSPoint.y(), mouseRELEASEPoint.y()) );  
      QRect selectionIMAGE( topLeft, bottomRight );
      /* display rect mesure  image crop !!! */
          /* display rect mesure  text crop !!! */
      QPoint topLeftT( QMIN(mousePRESSPoint.x(), mouseRELEASEPoint.x()) + TEXT_MARGIN ,
                      QMIN(mousePRESSPoint.y(), mouseRELEASEPoint.y()) + TEXT_MARGIN );
      QPoint bottomRightT( QMAX(mousePRESSPoint.x(), mouseRELEASEPoint.x()) + TEXT_MARGIN ,
                        QMAX(mousePRESSPoint.y(), mouseRELEASEPoint.y()) + TEXT_MARGIN );  
      QRect selectionTEXT( topLeftT, bottomRightT );
      /* display rect mesure  text crop !!! */
 
    QPen pen;
    pen.setStyle( Qt::SolidLine );
    pen.setCapStyle( Qt::RoundCap );
    pen.setColor( fillrectcolor );
    pen.setWidth( 2 );
    /* display rect to crop image !!! */
    painter.setPen( pen);  
    painter.drawRect(selectionIMAGE);  
    /* display rect to crop image !!! */
    /* display text image ratio text on crop image !!! */
    pen.setColor( textColor );
    painter.setPen( pen);
    /* display text image ratio text on crop image !!! */
    painter.drawText(selectionTEXT,selectionText);
   //////// Show_Actual_Params(); /* debug display coordinate all */
}
 
void Image_Operator::mousePressEvent(QMouseEvent *e)
{        
  qDebug() << "### mousePressEvent -> " << e->x() << "x" << e->y();  
  mousePRESSPoint = e->pos();
}
void Image_Operator::mouseReleaseEvent(QMouseEvent *e)
{        
  qDebug() << "### mouseReleaseEvent -> " << e->x() << "x" << e->y();  
  mouseRELEASEPoint = e->pos();
}
 
void Image_Operator::mouseMoveEvent(QMouseEvent *e)
{        
  qDebug() << "### mouseReleaseEvent -> " << e->x() << "x" << e->y();  
  mouseMOVEPoint = e->pos();    
}

void Image_Operator::paintEvent(QPaintEvent *e)
{
    
    if (display.isNull()) {
    qDebug() << "### display pixmap broken!!!! " << display.isNull();
    return;
    }
    qDebug() << "### paintEvent go starter...... ";
    Load_Actual_Desktop();  /* widget size setting e resolution X11 */
    int hi_now = widgetSize.height();
    int wi_now = widgetSize.width();
    picscaled = display.scaled(wi_now,hi_now,Qt::KeepAspectRatio);   /* scaled to widget displayer */
    QSize actual_result = picscaled.size();  /* get */
    Ratio_On_Work(actual_result);
    QPainter painter(this);
    painter.drawPixmap(0,0,picscaled);
    QString selectionText;
    selectionText = QString("Image %1 x %2").arg(actual_result.width()).arg(actual_result.height());
    
      QFontMetrics fm( this->font() );
      int stringWidth = fm.width(selectionText);
      int stringHeight = fm.ascent();
      const int TEXT_MARGIN = 4;
      
    /* color to pen */
    QColor textColor = Qt::black;
    QColor fillrectcolor = Qt::red;
    
      int textX = 0;
      int textY = 0;
      
      /* display rect mesure  image crop !!! */
      QPoint topLeft( QMIN(mousePRESSPoint.x(), mouseRELEASEPoint.x()),
                      QMIN(mousePRESSPoint.y(), mouseRELEASEPoint.y()) );
      QPoint bottomRight( QMAX(mousePRESSPoint.x(), mouseRELEASEPoint.x()),
                        QMAX(mousePRESSPoint.y(), mouseRELEASEPoint.y()) );  
      QRect selectionIMAGE( topLeft, bottomRight );
      /* display rect mesure  image crop !!! */
          /* display rect mesure  text crop !!! */
      QPoint topLeftT( QMIN(mousePRESSPoint.x(), mouseRELEASEPoint.x()) + TEXT_MARGIN ,
                      QMIN(mousePRESSPoint.y(), mouseRELEASEPoint.y()) + TEXT_MARGIN );
      QPoint bottomRightT( QMAX(mousePRESSPoint.x(), mouseRELEASEPoint.x()) + TEXT_MARGIN ,
                        QMAX(mousePRESSPoint.y(), mouseRELEASEPoint.y()) + TEXT_MARGIN );  
      QRect selectionTEXT( topLeftT, bottomRightT );
      /* display rect mesure  text crop !!! */
      
    QPen pen;
    pen.setStyle( Qt::SolidLine );
    pen.setCapStyle( Qt::RoundCap );
    pen.setColor( fillrectcolor );
    pen.setWidth( 2 );
    /* display rect to crop image !!! */
    painter.setPen( pen);  
    painter.drawRect(selectionIMAGE);  
    /* display rect to crop image !!! */
    /* display text image ratio text on crop image !!! */
    pen.setColor( textColor );
    painter.setPen( pen);
    /* display text image ratio text on crop image !!! */
    painter.drawText(selectionTEXT,selectionText);
   //////// Show_Actual_Params(); /* debug display coordinate all */
}

void Image_Operator::mousePressEvent(QMouseEvent *e)
{        
  qDebug() << "### mousePressEvent -> " << e->x() << "x" << e->y();  
  mousePRESSPoint = e->pos();
}
void Image_Operator::mouseReleaseEvent(QMouseEvent *e)
{        
  qDebug() << "### mouseReleaseEvent -> " << e->x() << "x" << e->y();  
  mouseRELEASEPoint = e->pos();
}

void Image_Operator::mouseMoveEvent(QMouseEvent *e)
{        
  qDebug() << "### mouseReleaseEvent -> " << e->x() << "x" << e->y();  
  mouseMOVEPoint = e->pos();    
}

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