//override
bool renderFeaturesForStyle(
const Style& style,
const FeatureList& features,
osg::Referenced* buildData,
const GeoExtent& imageExtent,
osg::Image* image )
{
// A processing context to use with the filters:
FilterContext context;
context.setProfile( getFeatureSource()->getFeatureProfile() );
const LineSymbol* masterLine = style.getSymbol<LineSymbol>();
const PolygonSymbol* masterPoly = style.getSymbol<PolygonSymbol>();
// sort into bins, making a copy for lines that require buffering.
FeatureList polygons;
FeatureList lines;
for(FeatureList::const_iterator f = features.begin(); f != features.end(); ++f)
{
if ( f->get()->getGeometry() )
{
if ( masterPoly || f->get()->style()->has<PolygonSymbol>() )
{
polygons.push_back( f->get() );
}
if ( masterLine || f->get()->style()->has<LineSymbol>() )
{
Feature* newFeature = new Feature( *f->get() );
if ( !newFeature->getGeometry()->isLinear() )
{
newFeature->setGeometry( newFeature->getGeometry()->cloneAs(Geometry::TYPE_RING) );
}
lines.push_back( newFeature );
}
}
}
// initialize:
RenderFrame frame;
frame.xmin = imageExtent.xMin();
frame.ymin = imageExtent.yMin();
frame.xf = (double)image->s() / imageExtent.width();
frame.yf = (double)image->t() / imageExtent.height();
if ( lines.size() > 0 )
{
// We are buffering in the features native extent, so we need to use the
// transformed extent to get the proper "resolution" for the image
const SpatialReference* featureSRS = context.profile()->getSRS();
GeoExtent transformedExtent = imageExtent.transform(featureSRS);
double trans_xf = (double)image->s() / transformedExtent.width();
double trans_yf = (double)image->t() / transformedExtent.height();
// resolution of the image (pixel extents):
double xres = 1.0/trans_xf;
double yres = 1.0/trans_yf;
// downsample the line data so that it is no higher resolution than to image to which
// we intend to rasterize it. If you don't do this, you run the risk of the buffer
// operation taking forever on very high-res input data.
if ( _options.optimizeLineSampling() == true )
{
ResampleFilter resample;
resample.minLength() = osg::minimum( xres, yres );
context = resample.push( lines, context );
}
// now run the buffer operation on all lines:
BufferFilter buffer;
double lineWidth = 1.0;
if ( masterLine )
{
buffer.capStyle() = masterLine->stroke()->lineCap().value();
if ( masterLine->stroke()->width().isSet() )
{
lineWidth = masterLine->stroke()->width().value();
GeoExtent imageExtentInFeatureSRS = imageExtent.transform(featureSRS);
double pixelWidth = imageExtentInFeatureSRS.width() / (double)image->s();
// if the width units are specified, process them:
if (masterLine->stroke()->widthUnits().isSet() &&
masterLine->stroke()->widthUnits().get() != Units::PIXELS)
{
const Units& featureUnits = featureSRS->getUnits();
const Units& strokeUnits = masterLine->stroke()->widthUnits().value();
// if the units are different than those of the feature data, we need to
// do a units conversion.
if ( featureUnits != strokeUnits )
{
if ( Units::canConvert(strokeUnits, featureUnits) )
{
// linear to linear, no problem
lineWidth = strokeUnits.convertTo( featureUnits, lineWidth );
}
else if ( strokeUnits.isLinear() && featureUnits.isAngular() )
{
// linear to angular? approximate degrees per meter at the
// latitude of the tile's centroid.
lineWidth = masterLine->stroke()->widthUnits()->convertTo(Units::METERS, lineWidth);
double circ = featureSRS->getEllipsoid()->getRadiusEquator() * 2.0 * osg::PI;
double x, y;
context.profile()->getExtent().getCentroid(x, y);
double radians = (lineWidth/circ) * cos(osg::DegreesToRadians(y));
lineWidth = osg::RadiansToDegrees(radians);
}
}
// enfore a minimum width of one pixel.
float minPixels = masterLine->stroke()->minPixels().getOrUse( 1.0f );
lineWidth = osg::clampAbove(lineWidth, pixelWidth*minPixels);
}
else // pixels
{
lineWidth *= pixelWidth;
}
}
}
buffer.distance() = lineWidth * 0.5; // since the distance is for one side
buffer.push( lines, context );
}
// Transform the features into the map's SRS:
TransformFilter xform( imageExtent.getSRS() );
xform.setLocalizeCoordinates( false );
FilterContext polysContext = xform.push( polygons, context );
FilterContext linesContext = xform.push( lines, context );
// set up the AGG renderer:
agg::rendering_buffer rbuf( image->data(), image->s(), image->t(), image->s()*4 );
// Create the renderer and the rasterizer
agg::renderer<agg::span_abgr32> ren(rbuf);
agg::rasterizer ras;
// Setup the rasterizer
ras.gamma(1.3);
ras.filling_rule(agg::fill_even_odd);
// construct an extent for cropping the geometry to our tile.
// extend just outside the actual extents so we don't get edge artifacts:
GeoExtent cropExtent = GeoExtent(imageExtent);
cropExtent.scale(1.1, 1.1);
osg::ref_ptr<Symbology::Polygon> cropPoly = new Symbology::Polygon( 4 );
cropPoly->push_back( osg::Vec3d( cropExtent.xMin(), cropExtent.yMin(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMax(), cropExtent.yMin(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMax(), cropExtent.yMax(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMin(), cropExtent.yMax(), 0 ));
// render the polygons
for(FeatureList::iterator i = polygons.begin(); i != polygons.end(); i++)
{
Feature* feature = i->get();
Geometry* geometry = feature->getGeometry();
osg::ref_ptr<Geometry> croppedGeometry;
if ( geometry->crop( cropPoly.get(), croppedGeometry ) )
{
const PolygonSymbol* poly =
feature->style().isSet() && feature->style()->has<PolygonSymbol>() ? feature->style()->get<PolygonSymbol>() :
masterPoly;
const osg::Vec4 color = poly ? static_cast<osg::Vec4>(poly->fill()->color()) : osg::Vec4(1,1,1,1);
rasterize(croppedGeometry.get(), color, frame, ras, ren);
}
}
// render the lines
for(FeatureList::iterator i = lines.begin(); i != lines.end(); i++)
{
Feature* feature = i->get();
Geometry* geometry = feature->getGeometry();
osg::ref_ptr<Geometry> croppedGeometry;
if ( geometry->crop( cropPoly.get(), croppedGeometry ) )
{
const LineSymbol* line =
feature->style().isSet() && feature->style()->has<LineSymbol>() ? feature->style()->get<LineSymbol>() :
masterLine;
const osg::Vec4 color = line ? static_cast<osg::Vec4>(line->stroke()->color()) : osg::Vec4(1,1,1,1);
rasterize(croppedGeometry.get(), color, frame, ras, ren);
}
}
return true;
}
//override
bool renderFeaturesForStyle(
const Style& style,
const FeatureList& inFeatures,
osg::Referenced* buildData,
const GeoExtent& imageExtent,
osg::Image* image )
{
// local copy of the features that we can process
FeatureList features = inFeatures;
BuildData* bd = static_cast<BuildData*>( buildData );
// A processing context to use with the filters:
FilterContext context;
context.profile() = getFeatureSource()->getFeatureProfile();
const LineSymbol* masterLine = style.getSymbol<LineSymbol>();
const PolygonSymbol* masterPoly = style.getSymbol<PolygonSymbol>();
//bool embeddedStyles = getFeatureSource()->hasEmbeddedStyles();
// if only a line symbol exists, and there are polygons in the mix, draw them
// as outlines (line rings).
//OE_INFO << LC << "Line Symbol = " << (masterLine == 0L ? "null" : masterLine->getConfig().toString()) << std::endl;
//OE_INFO << LC << "Poly SYmbol = " << (masterPoly == 0L ? "null" : masterPoly->getConfig().toString()) << std::endl;
//bool convertPolysToRings = poly == 0L && line != 0L;
//if ( convertPolysToRings )
// OE_INFO << LC << "No PolygonSymbol; will draw polygons to rings" << std::endl;
// initialize:
double xmin = imageExtent.xMin();
double ymin = imageExtent.yMin();
//double s = (double)image->s();
//double t = (double)image->t();
double xf = (double)image->s() / imageExtent.width();
double yf = (double)image->t() / imageExtent.height();
// strictly speaking we should iterate over the features and buffer each one that's a line,
// rather then checking for the existence of a LineSymbol.
FeatureList linesToBuffer;
for(FeatureList::iterator i = features.begin(); i != features.end(); i++)
{
Feature* feature = i->get();
Geometry* geom = feature->getGeometry();
if ( geom )
{
// check for an embedded style:
const LineSymbol* line = feature->style().isSet() ?
feature->style()->getSymbol<LineSymbol>() : masterLine;
const PolygonSymbol* poly =
feature->style().isSet() ? feature->style()->getSymbol<PolygonSymbol>() : masterPoly;
// if we have polygons but only a LineSymbol, draw the poly as a line.
if ( geom->getComponentType() == Geometry::TYPE_POLYGON )
{
if ( !poly && line )
{
Feature* outline = new Feature( *feature );
geom = geom->cloneAs( Geometry::TYPE_RING );
outline->setGeometry( geom );
*i = outline;
feature = outline;
}
//TODO: fix to enable outlined polys. doesn't work, not sure why -gw
//else if ( poly && line )
//{
// Feature* outline = new Feature();
// geom = geom->cloneAs( Geometry::TYPE_LINESTRING );
// outline->setGeometry( geom );
// features.push_back( outline );
//}
}
bool needsBuffering =
geom->getComponentType() == Geometry::TYPE_LINESTRING ||
geom->getComponentType() == Geometry::TYPE_RING;
if ( needsBuffering )
{
linesToBuffer.push_back( feature );
}
}
}
if ( linesToBuffer.size() > 0 )
{
//We are buffering in the features native extent, so we need to use the transform extent to get the proper "resolution" for the image
GeoExtent transformedExtent = imageExtent.transform(context.profile()->getSRS());
double trans_xf = (double)image->s() / transformedExtent.width();
double trans_yf = (double)image->t() / transformedExtent.height();
// resolution of the image (pixel extents):
double xres = 1.0/trans_xf;
double yres = 1.0/trans_yf;
// downsample the line data so that it is no higher resolution than to image to which
// we intend to rasterize it. If you don't do this, you run the risk of the buffer
// operation taking forever on very high-res input data.
if ( _options.optimizeLineSampling() == true )
{
ResampleFilter resample;
resample.minLength() = osg::minimum( xres, yres );
context = resample.push( linesToBuffer, context );
}
// now run the buffer operation on all lines:
BufferFilter buffer;
float lineWidth = 0.5;
if ( masterLine )
{
buffer.capStyle() = masterLine->stroke()->lineCap().value();
if ( masterLine->stroke()->width().isSet() )
lineWidth = masterLine->stroke()->width().value();
}
// "relative line size" means that the line width is expressed in (approx) pixels
// rather than in map units
if ( _options.relativeLineSize() == true )
buffer.distance() = xres * lineWidth;
else
buffer.distance() = lineWidth;
buffer.push( linesToBuffer, context );
}
// First, transform the features into the map's SRS:
TransformFilter xform( imageExtent.getSRS() );
xform.setLocalizeCoordinates( false );
context = xform.push( features, context );
// set up the AGG renderer:
agg::rendering_buffer rbuf( image->data(), image->s(), image->t(), image->s()*4 );
// Create the renderer and the rasterizer
agg::renderer<agg::span_abgr32> ren(rbuf);
agg::rasterizer ras;
// Setup the rasterizer
ras.gamma(1.3);
ras.filling_rule(agg::fill_even_odd);
GeoExtent cropExtent = GeoExtent(imageExtent);
cropExtent.scale(1.1, 1.1);
osg::ref_ptr<Symbology::Polygon> cropPoly = new Symbology::Polygon( 4 );
cropPoly->push_back( osg::Vec3d( cropExtent.xMin(), cropExtent.yMin(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMax(), cropExtent.yMin(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMax(), cropExtent.yMax(), 0 ));
cropPoly->push_back( osg::Vec3d( cropExtent.xMin(), cropExtent.yMax(), 0 ));
double lineWidth = 1.0;
if ( masterLine )
lineWidth = (double)masterLine->stroke()->width().value();
osg::Vec4 color = osg::Vec4(1, 1, 1, 1);
if ( masterLine )
color = masterLine->stroke()->color();
// render the features
for(FeatureList::iterator i = features.begin(); i != features.end(); i++)
{
Feature* feature = i->get();
//bool first = bd->_pass == 0 && i == features.begin();
Geometry* geometry = feature->getGeometry();
osg::ref_ptr< Geometry > croppedGeometry;
if ( ! geometry->crop( cropPoly.get(), croppedGeometry ) )
continue;
// set up a default color:
osg::Vec4 c = color;
unsigned int a = (unsigned int)(127+(c.a()*255)/2); // scale alpha up
agg::rgba8 fgColor( (unsigned int)(c.r()*255), (unsigned int)(c.g()*255), (unsigned int)(c.b()*255), a );
GeometryIterator gi( croppedGeometry.get() );
while( gi.hasMore() )
{
c = color;
Geometry* g = gi.next();
const LineSymbol* line = feature->style().isSet() ?
feature->style()->getSymbol<LineSymbol>() : masterLine;
const PolygonSymbol* poly =
feature->style().isSet() ? feature->style()->getSymbol<PolygonSymbol>() : masterPoly;
if (g->getType() == Geometry::TYPE_RING || g->getType() == Geometry::TYPE_LINESTRING)
{
if ( line )
c = line->stroke()->color();
else if ( poly )
c = poly->fill()->color();
}
else if ( g->getType() == Geometry::TYPE_POLYGON )
{
if ( poly )
c = poly->fill()->color();
else if ( line )
c = line->stroke()->color();
}
a = (unsigned int)(127+(c.a()*255)/2); // scale alpha up
fgColor = agg::rgba8( (unsigned int)(c.r()*255), (unsigned int)(c.g()*255), (unsigned int)(c.b()*255), a );
ras.filling_rule( agg::fill_even_odd );
for( Geometry::iterator p = g->begin(); p != g->end(); p++ )
{
const osg::Vec3d& p0 = *p;
double x0 = xf*(p0.x()-xmin);
double y0 = yf*(p0.y()-ymin);
//const osg::Vec3d& p1 = p+1 != g->end()? *(p+1) : g->front();
//double x1 = xf*(p1.x()-xmin);
//double y1 = yf*(p1.y()-ymin);
if ( p == g->begin() )
ras.move_to_d( x0, y0 );
else
ras.line_to_d( x0, y0 );
}
}
ras.render(ren, fgColor);
ras.reset();
}
bd->_pass++;
return true;
}