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svgpp/src/samples/sample01e.cpp
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#include <rapidxml_ns/rapidxml_ns.hpp> | |
#include <svgpp/policy/xml/rapidxml_ns.hpp> | |
#include <svgpp/svgpp.hpp> | |
using namespace svgpp; | |
typedef rapidxml_ns::xml_node<> const * xml_element_t; | |
class BaseContext | |
{ | |
public: | |
void on_exit_element() | |
{} | |
void transform_matrix(const boost::array<double, 6> & matrix) | |
{} | |
void set_viewport(double viewport_x, double viewport_y, double viewport_width, double viewport_height) | |
{} | |
void set_viewbox_size(double viewbox_width, double viewbox_height) | |
{} | |
void disable_rendering() | |
{} | |
}; | |
class ShapeContext: public BaseContext | |
{ | |
public: | |
ShapeContext(BaseContext const & parent) | |
{} | |
void path_move_to(double x, double y, tag::coordinate::absolute) | |
{} | |
void path_line_to(double x, double y, tag::coordinate::absolute) | |
{} | |
void path_cubic_bezier_to( | |
double x1, double y1, | |
double x2, double y2, | |
double x, double y, | |
tag::coordinate::absolute) | |
{} | |
void path_quadratic_bezier_to( | |
double x1, double y1, | |
double x, double y, | |
tag::coordinate::absolute) | |
{} | |
void path_elliptical_arc_to( | |
double rx, double ry, double x_axis_rotation, | |
bool large_arc_flag, bool sweep_flag, | |
double x, double y, | |
tag::coordinate::absolute) | |
{} | |
void path_close_subpath() | |
{} | |
void path_exit() | |
{} | |
}; | |
class UseContext: public BaseContext | |
{ | |
public: | |
UseContext(BaseContext const & parent) | |
{} | |
boost::optional<double> const & width() const { return width_; } | |
boost::optional<double> const & height() const { return height_; } | |
template<class IRI> | |
void set(tag::attribute::xlink::href, tag::iri_fragment, IRI const & fragment) | |
{ fragment_id_.assign(boost::begin(fragment), boost::end(fragment)); } | |
template<class IRI> | |
void set(tag::attribute::xlink::href, IRI const & fragment) | |
{ std::cerr << "External references aren't supported\n"; } | |
void set(tag::attribute::x, double val) | |
{ x_ = val; } | |
void set(tag::attribute::y, double val) | |
{ y_ = val; } | |
void set(tag::attribute::width, double val) | |
{ width_ = val; } | |
void set(tag::attribute::height, double val) | |
{ height_ = val; } | |
void on_exit_element(); | |
private: | |
std::string fragment_id_; | |
double x_, y_; | |
boost::optional<double> width_, height_; | |
}; | |
class ReferencedSymbolOrSvgContext: | |
public BaseContext | |
{ | |
public: | |
ReferencedSymbolOrSvgContext(UseContext & referencing) | |
: BaseContext(referencing) | |
, referencing_(referencing) | |
{ | |
} | |
void get_reference_viewport_size(double & width, double & height) | |
{ | |
if (referencing_.width()) | |
width = *referencing_.width(); | |
if (referencing_.height()) | |
height = *referencing_.height(); | |
} | |
private: | |
UseContext & referencing_; | |
}; | |
struct ChildContextFactories | |
{ | |
template<class ParentContext, class ElementTag, class Enable = void> | |
struct apply | |
{ | |
// Default definition handles "svg" and "g" elements | |
typedef factory::context::on_stack<BaseContext> type; | |
}; | |
}; | |
// This specialization handles all shape elements (elements from traits::shape_elements sequence) | |
template<class ElementTag> | |
struct ChildContextFactories::apply<BaseContext, ElementTag, | |
typename boost::enable_if<boost::mpl::has_key<traits::shape_elements, ElementTag> >::type> | |
{ | |
typedef factory::context::on_stack<ShapeContext> type; | |
}; | |
template<> | |
struct ChildContextFactories::apply<BaseContext, tag::element::use_> | |
{ | |
typedef factory::context::on_stack<UseContext> type; | |
}; | |
// Elements referenced by 'use' element | |
template<> | |
struct ChildContextFactories::apply<UseContext, tag::element::svg, void> | |
{ | |
typedef factory::context::on_stack<ReferencedSymbolOrSvgContext> type; | |
}; | |
template<> | |
struct ChildContextFactories::apply<UseContext, tag::element::symbol, void> | |
{ | |
typedef factory::context::on_stack<ReferencedSymbolOrSvgContext> type; | |
}; | |
template<class ElementTag> | |
struct ChildContextFactories::apply<UseContext, ElementTag, void>: ChildContextFactories::apply<BaseContext, ElementTag> | |
{}; | |
template<class ElementTag> | |
struct ChildContextFactories::apply<ReferencedSymbolOrSvgContext, ElementTag, void>: | |
ChildContextFactories::apply<BaseContext, ElementTag> | |
{}; | |
typedef | |
boost::mpl::set< | |
// SVG Structural Elements | |
tag::element::svg, | |
tag::element::g, | |
tag::element::use_, | |
// SVG Shape Elements | |
tag::element::circle, | |
tag::element::ellipse, | |
tag::element::line, | |
tag::element::path, | |
tag::element::polygon, | |
tag::element::polyline, | |
tag::element::rect | |
>::type processed_elements_t; | |
// This cryptic code just merges predefined sequences traits::shapes_attributes_by_element | |
// and traits::viewport_attributes with tag::attribute::transform and tag::attribute::xlink::href | |
// attributes into single MPL sequence | |
typedef | |
boost::mpl::fold< | |
boost::mpl::protect< | |
boost::mpl::joint_view< | |
traits::shapes_attributes_by_element, | |
traits::viewport_attributes | |
> | |
>, | |
boost::mpl::set< | |
tag::attribute::transform, | |
boost::mpl::pair<tag::element::use_, tag::attribute::xlink::href> | |
>::type, | |
boost::mpl::insert<boost::mpl::_1, boost::mpl::_2> | |
>::type processed_attributes_t; | |
typedef | |
document_traversal< | |
processed_elements<processed_elements_t>, | |
processed_attributes<processed_attributes_t>, | |
viewport_policy<policy::viewport::as_transform>, | |
context_factories<ChildContextFactories> | |
> document_traversal_t; | |
void loadSvg(xml_element_t xml_root_element) | |
{ | |
BaseContext context; | |
document_traversal_t::load_document(xml_root_element, context); | |
} | |
xml_element_t FindCurrentDocumentElementById(std::string const &) | |
{ | |
// To be implemented. | |
return NULL; | |
} | |
void UseContext::on_exit_element() | |
{ | |
if (xml_element_t element = FindCurrentDocumentElementById(fragment_id_)) | |
{ | |
// TODO: Check for cyclic references | |
// TODO: Apply translate transform (x_, y_) | |
document_traversal_t::load_referenced_element< | |
referencing_element<tag::element::use_>, | |
expected_elements<traits::reusable_elements>, | |
processed_elements< | |
boost::mpl::insert<processed_elements_t, tag::element::symbol>::type | |
> | |
>::load(element, *this); | |
} | |
else | |
std::cerr << "Element referenced by 'use' not found\n"; | |
} | |
int main() | |
{ | |
#define TEXT(x) #x | |
char text[] = | |
TEXT(<svg width="10cm" height="3cm" viewBox="0 0 100 30" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">) | |
TEXT( <defs>) | |
TEXT( <rect id="MyRect" width="60" height="10"/>) | |
TEXT( </defs>) | |
TEXT( <rect x=".1" y=".1" width="99.8" height="29.8"/>) | |
TEXT( <use x="20" y="10" xlink:href="#MyRect"/>) | |
TEXT(</svg>); | |
rapidxml_ns::xml_document<> doc; // character type defaults to char | |
try | |
{ | |
doc.parse<0>(text); | |
if (rapidxml_ns::xml_node<> * svg_element = doc.first_node("svg")) | |
{ | |
loadSvg(svg_element); | |
} | |
} | |
catch (std::exception const & e) | |
{ | |
std::cerr << "Error loading SVG: " << e.what() << std::endl; | |
return 1; | |
} | |
return 0; | |
} |