void GeoDataLineStringPrivate::optimize (GeoDataLineString& lineString) const
{
QVector<GeoDataCoordinates>::iterator itCoords = lineString.begin();
QVector<GeoDataCoordinates>::const_iterator itEnd = lineString.constEnd();
if (lineString.size() < 2) return;
// Calculate the least non-zero detail-level by checking the bounding box
int startLevel = levelForResolution( ( lineString.latLonAltBox().width() + lineString.latLonAltBox().height() ) / 2 );
int currentLevel = startLevel;
int maxLevel = startLevel;
GeoDataCoordinates currentCoords;
lineString.first().setDetail(startLevel);
// Iterate through the linestring to assign different detail levels to the nodes.
// In general the first and last node should have the start level assigned as
// a detail level.
// Starting from the first node the algorithm picks those nodes which
// have a distance from each other that is just above the resolution that is
// associated with the start level (which we use as a "current level").
// Each of those nodes get the current level assigned as the detail level.
// After iterating through the linestring we increment the current level value
// and starting again with the first node we assign detail values in a similar way
// to the remaining nodes which have no final detail level assigned yet.
// We do as many iterations through the lineString as needed and bump up the
// current level until all nodes have a non-zero detail level assigned.
while ( currentLevel < 16 && currentLevel <= maxLevel + 1 ) {
itCoords = lineString.begin();
currentCoords = *itCoords;
++itCoords;
for( ; itCoords != itEnd; ++itCoords) {
if (itCoords->detail() != 0 && itCoords->detail() < currentLevel) continue;
if ( currentLevel == startLevel && (itCoords->longitude() == -M_PI || itCoords->longitude() == M_PI
|| itCoords->latitude() < -89 * DEG2RAD || itCoords->latitude() > 89 * DEG2RAD)) {
itCoords->setDetail(startLevel);
currentCoords = *itCoords;
maxLevel = currentLevel;
continue;
}
if (distanceSphere( currentCoords, *itCoords ) < resolutionForLevel(currentLevel + 1)) {
itCoords->setDetail(currentLevel + 1);
}
else {
itCoords->setDetail(currentLevel);
currentCoords = *itCoords;
maxLevel = currentLevel;
}
}
++currentLevel;
}
lineString.last().setDetail(startLevel);
}
void PolylineAnnotation::drawNodes( GeoPainter *painter )
{
// These are the 'real' dimensions of the drawn nodes. The ones which have class scope are used
// to generate the regions and they are a little bit larger, because, for example, it would be
// a little bit too hard to select nodes.
static const int d_regularDim = 10;
static const int d_selectedDim = 10;
static const int d_mergedDim = 20;
static const int d_hoveredDim = 20;
const GeoDataLineString line = static_cast<const GeoDataLineString>( *placemark()->geometry() );
QColor glowColor = QApplication::palette().highlightedText().color();
glowColor.setAlpha(120);
for ( int i = 0; i < line.size(); ++i ) {
// The order here is important, because a merged node can be at the same time selected.
if ( m_nodesList.at(i).isBeingMerged() ) {
painter->setBrush( mergedColor );
painter->drawEllipse( line.at(i), d_mergedDim, d_mergedDim );
} else if ( m_nodesList.at(i).isSelected() ) {
painter->setBrush( selectedColor );
painter->drawEllipse( line.at(i), d_selectedDim, d_selectedDim );
if ( m_nodesList.at(i).isEditingHighlighted() ||
m_nodesList.at(i).isMergingHighlighted() ) {
QPen defaultPen = painter->pen();
QPen newPen;
newPen.setWidth( defaultPen.width() + 3 );
newPen.setColor( glowColor );
painter->setBrush( Qt::NoBrush );
painter->setPen( newPen );
painter->drawEllipse( line.at(i), d_selectedDim + 2, d_selectedDim + 2 );
painter->setPen( defaultPen );
}
} else {
painter->setBrush( regularColor );
painter->drawEllipse( line.at(i), d_regularDim, d_regularDim );
if ( m_nodesList.at(i).isEditingHighlighted() ||
m_nodesList.at(i).isMergingHighlighted() ) {
QPen defaultPen = painter->pen();
QPen newPen;
newPen.setWidth( defaultPen.width() + 3 );
newPen.setColor( glowColor );
painter->setPen( newPen );
painter->setBrush( Qt::NoBrush );
painter->drawEllipse( line.at(i), d_regularDim + 2, d_regularDim + 2 );
painter->setPen( defaultPen );
}
}
}
if ( m_virtualHoveredNode != -1 ) {
painter->setBrush( hoveredColor );
GeoDataCoordinates newCoords;
if ( m_virtualHoveredNode + 1 ) {
newCoords = line.at( m_virtualHoveredNode + 1 ).interpolate( line.at( m_virtualHoveredNode ), 0.5 );
} else {
newCoords = line.first().interpolate( line.last(), 0.5 );
}
painter->drawEllipse( newCoords, d_hoveredDim, d_hoveredDim );
}
}