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cairo: match AGG functionality, adding support for dynamic ellipse drawing and loading from svg icons - closes #1071 (refs #952 - this is stopgap until we refactor and merge with point_symbolizer)

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This commit is contained in:
Dane Springmeyer 2012-03-27 19:21:11 -04:00
parent e22e47dfcc
commit 2edaefd0d6
2 changed files with 254 additions and 29 deletions
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2
include/mapnik/cairo_renderer.hpp
View file

@ -123,7 +123,7 @@ public:
}
protected:
void render_marker(pixel_position const& pos, marker const& marker, const agg::trans_affine & mtx, double opacity=1.0);
void render_marker(pixel_position const& pos, marker const& marker, const agg::trans_affine & mtx, double opacity=1.0, bool recenter=true);
Map const& m_;
Cairo::RefPtr<Cairo::Context> context_;

281
src/cairo_renderer.cpp
View file

@ -55,6 +55,11 @@
#include "agg_conv_clip_polygon.h"
#include "agg_conv_smooth_poly1.h"
// markers
#include "agg_path_storage.h"
#include "agg_ellipse.h"
// stl
#ifdef MAPNIK_DEBUG
#include <iostream>
@ -907,7 +912,7 @@ void cairo_renderer_base::start_map_processing(Map const& map)
context.stroke();
}
void cairo_renderer_base::render_marker(pixel_position const& pos, marker const& marker, const agg::trans_affine & tr, double opacity)
void cairo_renderer_base::render_marker(pixel_position const& pos, marker const& marker, const agg::trans_affine & tr, double opacity, bool recenter)
{
cairo_context context(context_);
@ -916,15 +921,21 @@ void cairo_renderer_base::start_map_processing(Map const& map)
box2d<double> bbox;
bbox = (*marker.get_vector_data())->bounding_box();
coord<double,2> c = bbox.center();
// center the svg marker on '0,0'
agg::trans_affine mtx = agg::trans_affine_translation(-c.x,-c.y);
// apply symbol transformation to get to map space
mtx *= tr;
// render the marker at the center of the marker box
mtx.translate(pos.x+0.5 * marker.width(), pos.y+0.5 * marker.height());
agg::trans_affine mtx = tr;
if (recenter)
{
coord<double,2> c = bbox.center();
// center the svg marker on '0,0'
mtx = agg::trans_affine_translation(-c.x,-c.y);
// apply symbol transformation to get to map space
mtx *= tr;
// render the marker at the center of the marker box
mtx.translate(pos.x+0.5 * marker.width(), pos.y+0.5 * marker.height());
}
typedef coord_transform2<CoordTransform,geometry_type> path_type;
agg::trans_affine transform;
mapnik::path_ptr vmarker = *marker.get_vector_data();
using namespace mapnik::svg;
agg::pod_bvector<path_attributes> const & attributes_ = vmarker->attributes();
@ -936,10 +947,13 @@ void cairo_renderer_base::start_map_processing(Map const& map)
context.save();
agg::trans_affine transform = attr.transform;
transform = attr.transform;
transform *= mtx;
if (transform.is_valid() && !transform.is_identity())
// TODO - this 'is_valid' check is not used in the AGG renderer and also
// appears to lead to bogus results with
// tests/data/good_maps/markers_symbolizer_lines_file.xml
if (/*transform.is_valid() && */ !transform.is_identity())
{
double m[6];
transform.store_to(m);
@ -974,7 +988,6 @@ void cairo_renderer_base::start_map_processing(Map const& map)
}
}
if(attr.stroke_gradient.get_gradient_type() != NO_GRADIENT || attr.stroke_flag)
{
context.add_agg_path(svg_path,attr.index);
@ -1243,37 +1256,249 @@ void cairo_renderer_base::start_map_processing(Map const& map)
}
}
// TODO - this is woefully behind the AGG version.
void cairo_renderer_base::process(markers_symbolizer const& sym,
mapnik::feature_ptr const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry_type> path_type;
arrow arrow_;
cairo_context context(context_);
color const& fill_ = sym.get_fill();
context.set_color(fill_.red(), fill_.green(), fill_.blue(), fill_.alpha());
double scale_factor_(1);
for (unsigned i = 0; i < feature->num_geometries(); ++i)
typedef agg::conv_clip_polyline<geometry_type> clipped_geometry_type;
typedef coord_transform2<CoordTransform,clipped_geometry_type> path_type;
agg::trans_affine tr;
boost::array<double,6> const& m = sym.get_transform();
tr.load_from(&m[0]);
// TODO - use this?
//tr = agg::trans_affine_scaling(scale_factor_) * tr;
std::string filename = path_processor_type::evaluate(*sym.get_filename(), *feature);
marker_placement_e placement_method = sym.get_marker_placement();
marker_type_e marker_type = sym.get_marker_type();
metawriter_with_properties writer = sym.get_metawriter();
if (!filename.empty())
{
geometry_type & geom = feature->get_geometry(i);
if (geom.num_points() > 1)
boost::optional<marker_ptr> mark = mapnik::marker_cache::instance()->find(filename, true);
if (mark && *mark)
{
if (!(*mark)->is_vector()) {
std::clog << "### Warning only svg markers are supported in the markers_symbolizer\n";
return;
}
boost::optional<path_ptr> marker = (*mark)->get_vector_data();
box2d<double> const& bbox = (*marker)->bounding_box();
double x1 = bbox.minx();
double y1 = bbox.miny();
double x2 = bbox.maxx();
double y2 = bbox.maxy();
double w = (*mark)->width();
double h = (*mark)->height();
path_type path(t_, geom, prj_trans);
agg::trans_affine recenter = agg::trans_affine_translation(-0.5*(x1+x2),-0.5*(y1+y2));
tr.transform(&x1,&y1);
tr.transform(&x2,&y2);
box2d<double> extent(x1,y1,x2,y2);
using namespace mapnik::svg;
markers_placement<path_type, label_collision_detector4> placement(path, arrow_.extent(), detector_, sym.get_spacing(), sym.get_max_error(), sym.get_allow_overlap());
for (unsigned i=0; i<feature->num_geometries(); ++i)
{
geometry_type & geom = feature->get_geometry(i);
// TODO - merge this code with point_symbolizer rendering
if (placement_method == MARKER_POINT_PLACEMENT || geom.num_points() <= 1)
{
double x;
double y;
double z=0;
geom.label_interior_position(&x, &y);
prj_trans.backward(x,y,z);
t_.forward(&x,&y);
extent.re_center(x,y);
double x, y, angle;
while (placement.get_point(&x, &y, &angle)) {
Cairo::Matrix matrix = Cairo::rotation_matrix(angle) * Cairo::translation_matrix(x,y) ;
context.set_matrix(matrix);
context.add_path(arrow_);
if (sym.get_allow_overlap() ||
detector_.has_placement(extent))
{
render_marker(pixel_position(x - 0.5 * w, y - 0.5 * h) ,**mark, tr, sym.get_opacity());
// TODO - impl this for markers?
//if (!sym.get_ignore_placement())
// detector_.insert(label_ext);
metawriter_with_properties writer = sym.get_metawriter();
if (writer.first) writer.first->add_box(extent, *feature, t_, writer.second);
}
}
else
{
clipped_geometry_type clipped(geom);
clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
path_type path(t_,clipped,prj_trans);
markers_placement<path_type, label_collision_detector4> placement(path, extent, detector_,
sym.get_spacing() * scale_factor_,
sym.get_max_error(),
sym.get_allow_overlap());
double x, y, angle;
while (placement.get_point(&x, &y, &angle))
{
agg::trans_affine matrix = recenter * tr * agg::trans_affine_rotation(angle) * agg::trans_affine_translation(x, y);
render_marker(pixel_position(x - 0.5 * w, y - 0.5 * h), **mark, matrix, sym.get_opacity(),false);
if (writer.first)
//writer.first->add_box(label_ext, feature, t_, writer.second);
std::clog << "### Warning metawriter not yet supported for LINE placement\n";
}
}
context.fill();
}
}
}
else
{
color const& fill_ = sym.get_fill();
unsigned r = fill_.red();
unsigned g = fill_.green();
unsigned b = fill_.blue();
unsigned a = fill_.alpha();
stroke const& stroke_ = sym.get_stroke();
color const& col = stroke_.get_color();
double strk_width = stroke_.get_width();
unsigned s_r=col.red();
unsigned s_g=col.green();
unsigned s_b=col.blue();
unsigned s_a=col.alpha();
double w = sym.get_width();
double h = sym.get_height();
double rx = w/2.0;
double ry = h/2.0;
arrow arrow_;
box2d<double> extent;
double dx = w + (2*strk_width);
double dy = h + (2*strk_width);
if (marker_type == ARROW)
{
extent = arrow_.extent();
double x1 = extent.minx();
double y1 = extent.miny();
double x2 = extent.maxx();
double y2 = extent.maxy();
tr.transform(&x1,&y1);
tr.transform(&x2,&y2);
extent.init(x1,y1,x2,y2);
}
else
{
double x1 = -1 *(dx);
double y1 = -1 *(dy);
double x2 = dx;
double y2 = dy;
tr.transform(&x1,&y1);
tr.transform(&x2,&y2);
extent.init(x1,y1,x2,y2);
}
double x;
double y;
double z=0;
agg::path_storage marker;
for (unsigned i=0; i<feature->num_geometries(); ++i)
{
geometry_type & geom = feature->get_geometry(i);
if (placement_method == MARKER_POINT_PLACEMENT || geom.num_points() <= 1)
{
geom.label_position(&x,&y);
prj_trans.backward(x,y,z);
t_.forward(&x,&y);
int px = int(floor(x - 0.5 * dx));
int py = int(floor(y - 0.5 * dy));
box2d<double> label_ext (px, py, px + dx +1, py + dy +1);
if (sym.get_allow_overlap() ||
detector_.has_placement(label_ext))
{
agg::ellipse c(x, y, rx, ry);
marker.concat_path(c);
context.set_color(fill_,sym.get_opacity());
context.add_agg_path(marker);
context.fill();
if (strk_width)
{
//context.restore();
context.set_color(col,stroke_.get_opacity());
context.set_line_width(stroke_.get_width());
if (stroke_.has_dash())
{
context.set_dash(stroke_.get_dash_array());
}
context.add_agg_path(marker);
context.stroke();
}
if (!sym.get_ignore_placement())
detector_.insert(label_ext);
if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
}
}
else
{
if (marker_type == ARROW)
marker.concat_path(arrow_);
clipped_geometry_type clipped(geom);
clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
path_type path(t_,clipped,prj_trans);
markers_placement<path_type, label_collision_detector4> placement(path, extent, detector_,
sym.get_spacing() * scale_factor_,
sym.get_max_error(),
sym.get_allow_overlap());
double x_t, y_t, angle;
while (placement.get_point(&x_t, &y_t, &angle))
{
agg::trans_affine matrix;
if (marker_type == ELLIPSE)
{
agg::ellipse c(x_t, y_t, rx, ry);
marker.concat_path(c);
agg::trans_affine matrix;
matrix *= agg::trans_affine_translation(-x_t,-y_t);
matrix *= agg::trans_affine_rotation(angle);
matrix *= agg::trans_affine_translation(x_t,y_t);
marker.transform(matrix);
}
else
{
matrix = tr * agg::trans_affine_rotation(angle) * agg::trans_affine_translation(x_t, y_t);
}
// TODO
if (writer.first)
//writer.first->add_box(label_ext, feature, t_, writer.second);
std::clog << "### Warning metawriter not yet supported for LINE placement\n";
agg::conv_transform<agg::path_storage, agg::trans_affine> trans(marker, matrix);
context.set_color(fill_,sym.get_opacity());
context.add_agg_path(trans);
context.fill();
if (strk_width)
{
context.set_color(col,stroke_.get_opacity());
context.set_line_width(stroke_.get_width());
if (stroke_.has_dash())
{
context.set_dash(stroke_.get_dash_array());
}
context.add_agg_path(trans);
context.stroke();
}
}
}
}
context.fill();
}
}