void TagViewer::paintEvent(
QPaintEvent* /*e*/
)
{
QPainter p( this );
float scale_f = scale_factor();
QRect drawing_area( 0, 0, size().width(), size().height() );
if( !pix_.isNull() && !size().isNull() ) {
p.drawPixmap( drawing_area, pix_ );
} else {
QTextOption options( Qt::AlignLeft );
options.setWrapMode( QTextOption::WordWrap );
p.setPen( QPen( Qt::red, 4 ) );
p.drawText(
QRectF( drawing_area ),
"Image cannot be displayed. Check:\n"
" - the same image is selected among the multiple selection (it's ok to select labels)\n"
" - the image file is still at the same disk location when imported\n"
" - the image format is valid and/or the file is not corrupted ",
options
);
return;
}
QFont font;
font.setPointSize( 10 );
p.setFont( font );
// draw bounding boxes
for( QList<TagDisplayElement>::iterator tag_itr = elts_.begin(); tag_itr != elts_.end(); ++tag_itr ) {
const TagDisplayElement& tag = *tag_itr;
const QList<QRect>& bbox = tag._bbox;
p.setPen( QPen( tag._color, 2 ) );
for( QList<QRect>::const_iterator bbox_itr = bbox.begin(); bbox_itr != bbox.end(); ++bbox_itr ) {
const QRect& box_rect = *bbox_itr;
QRect scaled_box( scale_f * box_rect.topLeft(), scale_f * box_rect.bottomRight() );
p.drawRect( scaled_box );
p.drawText( scaled_box.x(), scaled_box.y(), tag._label );
}
}
// draw current box being tagged
p.setPen( QPen( current_color_, 2 ) );
if( tagging_ && tag_start_ != tag_end_ ) {
QRect current_rect( tag_start_, tag_end_ );
p.drawRect( current_rect );
p.drawText( current_rect.x(), current_rect.y(), current_label_ );
}
}
void nxtCanvasWidget::paintEvent( QPaintEvent *event ){
QPainter painter( this );
//Set op some areas
QRect drawing_area( QPoint(), size() );
QPoint p_delta( pos_x, pos_y );
//Draw the entire widget gray
unsigned int widget_height = this->height();
unsigned int widget_width = this->width();
painter.fillRect( drawing_area, Qt::gray );
//Reserve some width for borders and the like
unsigned int left_area_width = 0;
unsigned int top_area_height = 0;
if( canvas ){
//If size changed
if( canvas->size_affected() )
emit visible_area_changed();
//Set up contants
QRect canvas_area( -canvas->get_offset_x(),-canvas->get_offset_y(), canvas->get_width(), canvas->get_height() );
qDebug( "nxtCanvasWidget: Redraw started" );
//Find last visible point on the widget
//QPoint end_point =
//Find start point
unsigned int start_x = -pos_x;
unsigned int start_y = -pos_y;
/* if( pos_x < 0 )
start_x = -pos_x;
if( pos_y < 0 )
start_y = -pos_y; */
unsigned int available_width = widget_width - left_area_width;
unsigned int available_height = widget_height - top_area_height;
//Find end point
unsigned int end_x = available_width / current_zoom - pos_x;
unsigned int end_y = available_height / current_zoom - pos_y;
//Round up instead of down
if( available_width / current_zoom )
end_x++;
if( available_height / current_zoom )
end_y++;
//Find size
unsigned int view_width = available_width / current_zoom;
unsigned int view_height = available_height / current_zoom;
if( available_width / current_zoom )
view_width++;
if( available_height / current_zoom )
view_height++;
QRect visible_area( start_x, start_y, view_width, view_height );
QRect drawn_area = canvas_area & visible_area;
//Transform the view
painter.translate( 0, widget_height );
painter.scale( current_zoom, current_zoom );
painter.translate( pos_x, -pos_y );
//Draw the canvas background
painter.fillRect( drawn_area.x(), -(drawn_area.y()+drawn_area.height()), drawn_area.width(), drawn_area.height(), Qt::white );
//Draw the active pixels
for( int iy=drawn_area.y(); iy < drawn_area.y()+drawn_area.height(); iy++ ){
bool *pixel = canvas->get_scanline( iy + canvas->get_offset_y() );
pixel += drawn_area.x() + canvas->get_offset_x();
for( int ix=drawn_area.x(); ix < drawn_area.x()+drawn_area.width(); ix++ ){
if( *pixel )
painter.fillRect( ix, -iy-1, 1, 1, Qt::black );
pixel++;
}
}
//Draw grid if zoom is large enough
if( current_zoom > 2 ){
//Draw base grid
painter.setPen( QColor( 0xA0, 0xA0, 0xA4 ) );
for( int ix=drawn_area.x(); ix < drawn_area.x()+drawn_area.width()+1; ix++ )
painter.drawLine( ix,-drawn_area.y(), ix,-(drawn_area.y()+drawn_area.height()) );
for( int iy=drawn_area.y(); iy < drawn_area.y()+drawn_area.height()+1; iy++ )
painter.drawLine( drawn_area.x(),-iy, (drawn_area.x()+drawn_area.width()),-iy );
//Draw larger grid
painter.setPen( QColor( 0x58, 0x58, 0xFF ) );
for( int ix=drawn_area.x(); ix < drawn_area.x()+drawn_area.width()+1; ix++ )
if( (ix % 10) == 0 )
painter.drawLine( ix,-drawn_area.y(), ix,-(drawn_area.y()+drawn_area.height()) );
for( int iy=drawn_area.y(); iy < drawn_area.y()+drawn_area.height()+1; iy++ )
if( (iy % 10) == 0 )
painter.drawLine( drawn_area.x(),-iy, (drawn_area.x()+drawn_area.width()),-iy );
}
painter.fillRect( selection.x(), -(selection.y()+selection.height()), selection.width(), selection.height(), QColor( 255,0,0, 128 ) );
canvas->reset_affected();
}
}
