/usr/include/mapnik/agg/agg_path_storage.h is in libmapnik-dev 2.2.0+ds1-6build2.
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// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_PATH_STORAGE_INCLUDED
#define AGG_PATH_STORAGE_INCLUDED
#include <cstring>
#include <cmath>
#include "agg_math.h"
#include "agg_array.h"
#include "agg_bezier_arc.h"
namespace agg
{
//----------------------------------------------------vertex_block_storage
template<class T, unsigned BlockShift=8, unsigned BlockPool=256>
class vertex_block_storage
{
public:
// Allocation parameters
enum block_scale_e
{
block_shift = BlockShift,
block_size = 1 << block_shift,
block_mask = block_size - 1,
block_pool = BlockPool
};
typedef T value_type;
typedef vertex_block_storage<T, BlockShift, BlockPool> self_type;
~vertex_block_storage();
vertex_block_storage();
vertex_block_storage(const self_type& v);
const self_type& operator = (const self_type& ps);
void remove_all();
void free_all();
void add_vertex(double x, double y, unsigned cmd);
void modify_vertex(unsigned idx, double x, double y);
void modify_vertex(unsigned idx, double x, double y, unsigned cmd);
void modify_command(unsigned idx, unsigned cmd);
void swap_vertices(unsigned v1, unsigned v2);
unsigned last_command() const;
unsigned last_vertex(double* x, double* y) const;
unsigned prev_vertex(double* x, double* y) const;
double last_x() const;
double last_y() const;
unsigned total_vertices() const;
unsigned vertex(unsigned idx, double* x, double* y) const;
unsigned command(unsigned idx) const;
private:
void allocate_block(unsigned nb);
int8u* storage_ptrs(T** xy_ptr);
private:
unsigned m_total_vertices;
unsigned m_total_blocks;
unsigned m_max_blocks;
T** m_coord_blocks;
int8u** m_cmd_blocks;
};
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
void vertex_block_storage<T,S,P>::free_all()
{
if(m_total_blocks)
{
T** coord_blk = m_coord_blocks + m_total_blocks - 1;
while(m_total_blocks--)
{
pod_allocator<T>::deallocate(
*coord_blk,
block_size * 2 +
block_size / (sizeof(T) / sizeof(unsigned char)));
--coord_blk;
}
pod_allocator<T*>::deallocate(m_coord_blocks, m_max_blocks * 2);
m_total_blocks = 0;
m_max_blocks = 0;
m_coord_blocks = 0;
m_cmd_blocks = 0;
m_total_vertices = 0;
}
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
vertex_block_storage<T,S,P>::~vertex_block_storage()
{
free_all();
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
vertex_block_storage<T,S,P>::vertex_block_storage() :
m_total_vertices(0),
m_total_blocks(0),
m_max_blocks(0),
m_coord_blocks(0),
m_cmd_blocks(0)
{
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
vertex_block_storage<T,S,P>::vertex_block_storage(const vertex_block_storage<T,S,P>& v) :
m_total_vertices(0),
m_total_blocks(0),
m_max_blocks(0),
m_coord_blocks(0),
m_cmd_blocks(0)
{
*this = v;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
const vertex_block_storage<T,S,P>&
vertex_block_storage<T,S,P>::operator = (const vertex_block_storage<T,S,P>& v)
{
remove_all();
unsigned i;
for(i = 0; i < v.total_vertices(); i++)
{
double x, y;
unsigned cmd = v.vertex(i, &x, &y);
add_vertex(x, y, cmd);
}
return *this;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::remove_all()
{
m_total_vertices = 0;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::add_vertex(double x, double y,
unsigned cmd)
{
T* coord_ptr = 0;
*storage_ptrs(&coord_ptr) = (int8u)cmd;
coord_ptr[0] = T(x);
coord_ptr[1] = T(y);
m_total_vertices++;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::modify_vertex(unsigned idx,
double x, double y)
{
T* pv = m_coord_blocks[idx >> block_shift] + ((idx & block_mask) << 1);
pv[0] = T(x);
pv[1] = T(y);
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::modify_vertex(unsigned idx,
double x, double y,
unsigned cmd)
{
unsigned block = idx >> block_shift;
unsigned offset = idx & block_mask;
T* pv = m_coord_blocks[block] + (offset << 1);
pv[0] = T(x);
pv[1] = T(y);
m_cmd_blocks[block][offset] = (int8u)cmd;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::modify_command(unsigned idx,
unsigned cmd)
{
m_cmd_blocks[idx >> block_shift][idx & block_mask] = (int8u)cmd;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline void vertex_block_storage<T,S,P>::swap_vertices(unsigned v1, unsigned v2)
{
unsigned b1 = v1 >> block_shift;
unsigned b2 = v2 >> block_shift;
unsigned o1 = v1 & block_mask;
unsigned o2 = v2 & block_mask;
T* pv1 = m_coord_blocks[b1] + (o1 << 1);
T* pv2 = m_coord_blocks[b2] + (o2 << 1);
T val;
val = pv1[0]; pv1[0] = pv2[0]; pv2[0] = val;
val = pv1[1]; pv1[1] = pv2[1]; pv2[1] = val;
int8u cmd = m_cmd_blocks[b1][o1];
m_cmd_blocks[b1][o1] = m_cmd_blocks[b2][o2];
m_cmd_blocks[b2][o2] = cmd;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::last_command() const
{
if(m_total_vertices) return command(m_total_vertices - 1);
return path_cmd_stop;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::last_vertex(double* x, double* y) const
{
if(m_total_vertices) return vertex(m_total_vertices - 1, x, y);
return path_cmd_stop;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::prev_vertex(double* x, double* y) const
{
if(m_total_vertices > 1) return vertex(m_total_vertices - 2, x, y);
return path_cmd_stop;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline double vertex_block_storage<T,S,P>::last_x() const
{
if(m_total_vertices)
{
unsigned idx = m_total_vertices - 1;
return m_coord_blocks[idx >> block_shift][(idx & block_mask) << 1];
}
return 0.0;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline double vertex_block_storage<T,S,P>::last_y() const
{
if(m_total_vertices)
{
unsigned idx = m_total_vertices - 1;
return m_coord_blocks[idx >> block_shift][((idx & block_mask) << 1) + 1];
}
return 0.0;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::total_vertices() const
{
return m_total_vertices;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::vertex(unsigned idx,
double* x, double* y) const
{
unsigned nb = idx >> block_shift;
const T* pv = m_coord_blocks[nb] + ((idx & block_mask) << 1);
*x = pv[0];
*y = pv[1];
return m_cmd_blocks[nb][idx & block_mask];
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
inline unsigned vertex_block_storage<T,S,P>::command(unsigned idx) const
{
return m_cmd_blocks[idx >> block_shift][idx & block_mask];
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
void vertex_block_storage<T,S,P>::allocate_block(unsigned nb)
{
if(nb >= m_max_blocks)
{
T** new_coords =
pod_allocator<T*>::allocate((m_max_blocks + block_pool) * 2);
unsigned char** new_cmds =
(unsigned char**)(new_coords + m_max_blocks + block_pool);
if(m_coord_blocks)
{
memcpy(new_coords,
m_coord_blocks,
m_max_blocks * sizeof(T*));
memcpy(new_cmds,
m_cmd_blocks,
m_max_blocks * sizeof(unsigned char*));
pod_allocator<T*>::deallocate(m_coord_blocks, m_max_blocks * 2);
}
m_coord_blocks = new_coords;
m_cmd_blocks = new_cmds;
m_max_blocks += block_pool;
}
m_coord_blocks[nb] =
pod_allocator<T>::allocate(block_size * 2 +
block_size / (sizeof(T) / sizeof(unsigned char)));
m_cmd_blocks[nb] =
(unsigned char*)(m_coord_blocks[nb] + block_size * 2);
m_total_blocks++;
}
//------------------------------------------------------------------------
template<class T, unsigned S, unsigned P>
int8u* vertex_block_storage<T,S,P>::storage_ptrs(T** xy_ptr)
{
unsigned nb = m_total_vertices >> block_shift;
if(nb >= m_total_blocks)
{
allocate_block(nb);
}
*xy_ptr = m_coord_blocks[nb] + ((m_total_vertices & block_mask) << 1);
return m_cmd_blocks[nb] + (m_total_vertices & block_mask);
}
//-----------------------------------------------------poly_plain_adaptor
template<class T> class poly_plain_adaptor
{
public:
typedef T value_type;
poly_plain_adaptor() :
m_data(0),
m_ptr(0),
m_end(0),
m_closed(false),
m_stop(false)
{}
poly_plain_adaptor(const T* data, unsigned num_points, bool closed) :
m_data(data),
m_ptr(data),
m_end(data + num_points * 2),
m_closed(closed),
m_stop(false)
{}
void init(const T* data, unsigned num_points, bool closed)
{
m_data = data;
m_ptr = data;
m_end = data + num_points * 2;
m_closed = closed;
m_stop = false;
}
void rewind(unsigned)
{
m_ptr = m_data;
m_stop = false;
}
unsigned vertex(double* x, double* y)
{
if(m_ptr < m_end)
{
bool first = m_ptr == m_data;
*x = *m_ptr++;
*y = *m_ptr++;
return first ? path_cmd_move_to : path_cmd_line_to;
}
*x = *y = 0.0;
if(m_closed && !m_stop)
{
m_stop = true;
return path_cmd_end_poly | path_flags_close;
}
return path_cmd_stop;
}
private:
const T* m_data;
const T* m_ptr;
const T* m_end;
bool m_closed;
bool m_stop;
};
//-------------------------------------------------poly_container_adaptor
template<class Container> class poly_container_adaptor
{
public:
typedef typename Container::value_type vertex_type;
poly_container_adaptor() :
m_container(0),
m_index(0),
m_closed(false),
m_stop(false)
{}
poly_container_adaptor(const Container& data, bool closed) :
m_container(&data),
m_index(0),
m_closed(closed),
m_stop(false)
{}
void init(const Container& data, bool closed)
{
m_container = &data;
m_index = 0;
m_closed = closed;
m_stop = false;
}
void rewind(unsigned)
{
m_index = 0;
m_stop = false;
}
unsigned vertex(double* x, double* y)
{
if(m_index < m_container->size())
{
bool first = m_index == 0;
const vertex_type& v = (*m_container)[m_index++];
*x = v.x;
*y = v.y;
return first ? path_cmd_move_to : path_cmd_line_to;
}
*x = *y = 0.0;
if(m_closed && !m_stop)
{
m_stop = true;
return path_cmd_end_poly | path_flags_close;
}
return path_cmd_stop;
}
private:
const Container* m_container;
unsigned m_index;
bool m_closed;
bool m_stop;
};
//-----------------------------------------poly_container_reverse_adaptor
template<class Container> class poly_container_reverse_adaptor
{
public:
typedef typename Container::value_type vertex_type;
poly_container_reverse_adaptor() :
m_container(0),
m_index(-1),
m_closed(false),
m_stop(false)
{}
poly_container_reverse_adaptor(const Container& data, bool closed) :
m_container(&data),
m_index(-1),
m_closed(closed),
m_stop(false)
{}
void init(const Container& data, bool closed)
{
m_container = &data;
m_index = m_container->size() - 1;
m_closed = closed;
m_stop = false;
}
void rewind(unsigned)
{
m_index = m_container->size() - 1;
m_stop = false;
}
unsigned vertex(double* x, double* y)
{
if(m_index >= 0)
{
bool first = m_index == int(m_container->size() - 1);
const vertex_type& v = (*m_container)[m_index--];
*x = v.x;
*y = v.y;
return first ? path_cmd_move_to : path_cmd_line_to;
}
*x = *y = 0.0;
if(m_closed && !m_stop)
{
m_stop = true;
return path_cmd_end_poly | path_flags_close;
}
return path_cmd_stop;
}
private:
const Container* m_container;
int m_index;
bool m_closed;
bool m_stop;
};
//--------------------------------------------------------line_adaptor
class line_adaptor
{
public:
typedef double value_type;
line_adaptor() : m_line(m_coord, 2, false) {}
line_adaptor(double x1, double y1, double x2, double y2) :
m_line(m_coord, 2, false)
{
m_coord[0] = x1;
m_coord[1] = y1;
m_coord[2] = x2;
m_coord[3] = y2;
}
void init(double x1, double y1, double x2, double y2)
{
m_coord[0] = x1;
m_coord[1] = y1;
m_coord[2] = x2;
m_coord[3] = y2;
m_line.rewind(0);
}
void rewind(unsigned)
{
m_line.rewind(0);
}
unsigned vertex(double* x, double* y)
{
return m_line.vertex(x, y);
}
private:
double m_coord[4];
poly_plain_adaptor<double> m_line;
};
//---------------------------------------------------------------path_base
// A container to store vertices with their flags.
// A path consists of a number of contours separated with "move_to"
// commands. The path storage can keep and maintain more than one
// path.
// To navigate to the beginning of a particular path, use rewind(path_id);
// Where path_id is what start_new_path() returns. So, when you call
// start_new_path() you need to store its return value somewhere else
// to navigate to the path afterwards.
//
// See also: vertex_source concept
//------------------------------------------------------------------------
template<class VertexContainer> class path_base
{
public:
typedef VertexContainer container_type;
typedef path_base<VertexContainer> self_type;
//--------------------------------------------------------------------
path_base() : m_vertices(), m_iterator(0) {}
void remove_all() { m_vertices.remove_all(); m_iterator = 0; }
void free_all() { m_vertices.free_all(); m_iterator = 0; }
// Make path functions
//--------------------------------------------------------------------
unsigned start_new_path();
void move_to(double x, double y);
void move_rel(double dx, double dy);
void line_to(double x, double y);
void line_rel(double dx, double dy);
void hline_to(double x);
void hline_rel(double dx);
void vline_to(double y);
void vline_rel(double dy);
void arc_to(double rx, double ry,
double angle,
bool large_arc_flag,
bool sweep_flag,
double x, double y);
void arc_rel(double rx, double ry,
double angle,
bool large_arc_flag,
bool sweep_flag,
double dx, double dy);
void curve3(double x_ctrl, double y_ctrl,
double x_to, double y_to);
void curve3_rel(double dx_ctrl, double dy_ctrl,
double dx_to, double dy_to);
void curve3(double x_to, double y_to);
void curve3_rel(double dx_to, double dy_to);
void curve4(double x_ctrl1, double y_ctrl1,
double x_ctrl2, double y_ctrl2,
double x_to, double y_to);
void curve4_rel(double dx_ctrl1, double dy_ctrl1,
double dx_ctrl2, double dy_ctrl2,
double dx_to, double dy_to);
void curve4(double x_ctrl2, double y_ctrl2,
double x_to, double y_to);
void curve4_rel(double x_ctrl2, double y_ctrl2,
double x_to, double y_to);
void end_poly(unsigned flags = path_flags_close);
void close_polygon(unsigned flags = path_flags_none);
// Accessors
//--------------------------------------------------------------------
const container_type& vertices() const { return m_vertices; }
container_type& vertices() { return m_vertices; }
unsigned total_vertices() const;
void rel_to_abs(double* x, double* y) const;
unsigned last_vertex(double* x, double* y) const;
unsigned prev_vertex(double* x, double* y) const;
double last_x() const;
double last_y() const;
unsigned vertex(unsigned idx, double* x, double* y) const;
unsigned command(unsigned idx) const;
void modify_vertex(unsigned idx, double x, double y);
void modify_vertex(unsigned idx, double x, double y, unsigned cmd);
void modify_command(unsigned idx, unsigned cmd);
// VertexSource interface
//--------------------------------------------------------------------
void rewind(unsigned path_id);
unsigned vertex(double* x, double* y);
// Arrange the orientation of a polygon, all polygons in a path,
// or in all paths. After calling arrange_orientations() or
// arrange_orientations_all_paths(), all the polygons will have
// the same orientation, i.e. path_flags_cw or path_flags_ccw
//--------------------------------------------------------------------
unsigned arrange_polygon_orientation(unsigned start, path_flags_e orientation);
unsigned arrange_orientations(unsigned path_id, path_flags_e orientation);
void arrange_orientations_all_paths(path_flags_e orientation);
void invert_polygon(unsigned start);
// Flip all vertices horizontally or vertically,
// between x1 and x2, or between y1 and y2 respectively
//--------------------------------------------------------------------
void flip_x(double x1, double x2);
void flip_y(double y1, double y2);
// Concatenate path. The path is added as is.
//--------------------------------------------------------------------
template<class VertexSource>
void concat_path(VertexSource& vs, unsigned path_id = 0)
{
double x=0;
double y=0;
unsigned cmd;
vs.rewind(path_id);
while(!is_stop(cmd = vs.vertex(&x, &y)))
{
m_vertices.add_vertex(x, y, cmd);
}
}
//--------------------------------------------------------------------
// Join path. The path is joined with the existing one, that is,
// it behaves as if the pen of a plotter was always down (drawing)
template<class VertexSource>
void join_path(VertexSource& vs, unsigned path_id = 0)
{
double x=0.0, y=0.0;
unsigned cmd;
vs.rewind(path_id);
cmd = vs.vertex(&x, &y);
if(!is_stop(cmd))
{
if(is_vertex(cmd))
{
double x0, y0;
unsigned cmd0 = last_vertex(&x0, &y0);
if(is_vertex(cmd0))
{
if(calc_distance(x, y, x0, y0) > vertex_dist_epsilon)
{
if(is_move_to(cmd)) cmd = path_cmd_line_to;
m_vertices.add_vertex(x, y, cmd);
}
}
else
{
if(is_stop(cmd0))
{
cmd = path_cmd_move_to;
}
else
{
if(is_move_to(cmd)) cmd = path_cmd_line_to;
}
m_vertices.add_vertex(x, y, cmd);
}
}
while(!is_stop(cmd = vs.vertex(&x, &y)))
{
m_vertices.add_vertex(x, y, is_move_to(cmd) ?
unsigned(path_cmd_line_to) :
cmd);
}
}
}
// Concatenate polygon/polyline.
//--------------------------------------------------------------------
template<class T> void concat_poly(const T* data,
unsigned num_points,
bool closed)
{
poly_plain_adaptor<T> poly(data, num_points, closed);
concat_path(poly);
}
// Join polygon/polyline continuously.
//--------------------------------------------------------------------
template<class T> void join_poly(const T* data,
unsigned num_points,
bool closed)
{
poly_plain_adaptor<T> poly(data, num_points, closed);
join_path(poly);
}
//--------------------------------------------------------------------
void translate(double dx, double dy, unsigned path_id=0);
void translate_all_paths(double dx, double dy);
//--------------------------------------------------------------------
template<class Trans>
void transform(const Trans& trans, unsigned path_id=0)
{
unsigned num_ver = m_vertices.total_vertices();
for(; path_id < num_ver; path_id++)
{
double x, y;
unsigned cmd = m_vertices.vertex(path_id, &x, &y);
if(is_stop(cmd)) break;
if(is_vertex(cmd))
{
trans.transform(&x, &y);
m_vertices.modify_vertex(path_id, x, y);
}
}
}
//--------------------------------------------------------------------
template<class Trans>
void transform_all_paths(const Trans& trans)
{
unsigned idx;
unsigned num_ver = m_vertices.total_vertices();
for(idx = 0; idx < num_ver; idx++)
{
double x, y;
if(is_vertex(m_vertices.vertex(idx, &x, &y)))
{
trans.transform(&x, &y);
m_vertices.modify_vertex(idx, x, y);
}
}
}
private:
unsigned perceive_polygon_orientation(unsigned start, unsigned end);
void invert_polygon(unsigned start, unsigned end);
VertexContainer m_vertices;
unsigned m_iterator;
};
//------------------------------------------------------------------------
template<class VC>
unsigned path_base<VC>::start_new_path()
{
if(!is_stop(m_vertices.last_command()))
{
m_vertices.add_vertex(0.0, 0.0, path_cmd_stop);
}
return m_vertices.total_vertices();
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::rel_to_abs(double* x, double* y) const
{
if(m_vertices.total_vertices())
{
double x2;
double y2;
if(is_vertex(m_vertices.last_vertex(&x2, &y2)))
{
*x += x2;
*y += y2;
}
else if (!is_stop(m_vertices.last_command()) &&
is_vertex(m_vertices.prev_vertex(&x2, &y2)))
{
*x += x2;
*y += y2;
}
}
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::move_to(double x, double y)
{
m_vertices.add_vertex(x, y, path_cmd_move_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::move_rel(double dx, double dy)
{
rel_to_abs(&dx, &dy);
m_vertices.add_vertex(dx, dy, path_cmd_move_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::line_to(double x, double y)
{
m_vertices.add_vertex(x, y, path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::line_rel(double dx, double dy)
{
rel_to_abs(&dx, &dy);
m_vertices.add_vertex(dx, dy, path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::hline_to(double x)
{
m_vertices.add_vertex(x, last_y(), path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::hline_rel(double dx)
{
double dy = 0;
rel_to_abs(&dx, &dy);
m_vertices.add_vertex(dx, dy, path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::vline_to(double y)
{
m_vertices.add_vertex(last_x(), y, path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::vline_rel(double dy)
{
double dx = 0;
rel_to_abs(&dx, &dy);
m_vertices.add_vertex(dx, dy, path_cmd_line_to);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::arc_to(double rx, double ry,
double angle,
bool large_arc_flag,
bool sweep_flag,
double x, double y)
{
if(m_vertices.total_vertices() && is_vertex(m_vertices.last_command()))
{
const double epsilon = 1e-30;
double x0 = 0.0;
double y0 = 0.0;
m_vertices.last_vertex(&x0, &y0);
rx = fabs(rx);
ry = fabs(ry);
// Ensure radii are valid
//-------------------------
if(rx < epsilon || ry < epsilon)
{
line_to(x, y);
return;
}
if(calc_distance(x0, y0, x, y) < epsilon)
{
// If the endpoints (x, y) and (x0, y0) are identical, then this
// is equivalent to omitting the elliptical arc segment entirely.
return;
}
bezier_arc_svg a(x0, y0, rx, ry, angle, large_arc_flag, sweep_flag, x, y);
if(a.radii_ok())
{
join_path(a);
}
else
{
line_to(x, y);
}
}
else
{
move_to(x, y);
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::arc_rel(double rx, double ry,
double angle,
bool large_arc_flag,
bool sweep_flag,
double dx, double dy)
{
rel_to_abs(&dx, &dy);
arc_to(rx, ry, angle, large_arc_flag, sweep_flag, dx, dy);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve3(double x_ctrl, double y_ctrl,
double x_to, double y_to)
{
m_vertices.add_vertex(x_ctrl, y_ctrl, path_cmd_curve3);
m_vertices.add_vertex(x_to, y_to, path_cmd_curve3);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve3_rel(double dx_ctrl, double dy_ctrl,
double dx_to, double dy_to)
{
rel_to_abs(&dx_ctrl, &dy_ctrl);
rel_to_abs(&dx_to, &dy_to);
m_vertices.add_vertex(dx_ctrl, dy_ctrl, path_cmd_curve3);
m_vertices.add_vertex(dx_to, dy_to, path_cmd_curve3);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve3(double x_to, double y_to)
{
double x0;
double y0;
if(is_vertex(m_vertices.last_vertex(&x0, &y0)))
{
double x_ctrl;
double y_ctrl;
unsigned cmd = m_vertices.prev_vertex(&x_ctrl, &y_ctrl);
if(is_curve(cmd))
{
x_ctrl = x0 + x0 - x_ctrl;
y_ctrl = y0 + y0 - y_ctrl;
}
else
{
x_ctrl = x0;
y_ctrl = y0;
}
curve3(x_ctrl, y_ctrl, x_to, y_to);
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve3_rel(double dx_to, double dy_to)
{
rel_to_abs(&dx_to, &dy_to);
curve3(dx_to, dy_to);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve4(double x_ctrl1, double y_ctrl1,
double x_ctrl2, double y_ctrl2,
double x_to, double y_to)
{
m_vertices.add_vertex(x_ctrl1, y_ctrl1, path_cmd_curve4);
m_vertices.add_vertex(x_ctrl2, y_ctrl2, path_cmd_curve4);
m_vertices.add_vertex(x_to, y_to, path_cmd_curve4);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve4_rel(double dx_ctrl1, double dy_ctrl1,
double dx_ctrl2, double dy_ctrl2,
double dx_to, double dy_to)
{
rel_to_abs(&dx_ctrl1, &dy_ctrl1);
rel_to_abs(&dx_ctrl2, &dy_ctrl2);
rel_to_abs(&dx_to, &dy_to);
m_vertices.add_vertex(dx_ctrl1, dy_ctrl1, path_cmd_curve4);
m_vertices.add_vertex(dx_ctrl2, dy_ctrl2, path_cmd_curve4);
m_vertices.add_vertex(dx_to, dy_to, path_cmd_curve4);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve4(double x_ctrl2, double y_ctrl2,
double x_to, double y_to)
{
double x0;
double y0;
if(is_vertex(last_vertex(&x0, &y0)))
{
double x_ctrl1;
double y_ctrl1;
unsigned cmd = prev_vertex(&x_ctrl1, &y_ctrl1);
if(is_curve(cmd))
{
x_ctrl1 = x0 + x0 - x_ctrl1;
y_ctrl1 = y0 + y0 - y_ctrl1;
}
else
{
x_ctrl1 = x0;
y_ctrl1 = y0;
}
curve4(x_ctrl1, y_ctrl1, x_ctrl2, y_ctrl2, x_to, y_to);
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::curve4_rel(double dx_ctrl2, double dy_ctrl2,
double dx_to, double dy_to)
{
rel_to_abs(&dx_ctrl2, &dy_ctrl2);
rel_to_abs(&dx_to, &dy_to);
curve4(dx_ctrl2, dy_ctrl2, dx_to, dy_to);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::end_poly(unsigned flags)
{
if(is_vertex(m_vertices.last_command()))
{
m_vertices.add_vertex(0.0, 0.0, path_cmd_end_poly | flags);
}
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::close_polygon(unsigned flags)
{
end_poly(path_flags_close | flags);
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::total_vertices() const
{
return m_vertices.total_vertices();
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::last_vertex(double* x, double* y) const
{
return m_vertices.last_vertex(x, y);
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::prev_vertex(double* x, double* y) const
{
return m_vertices.prev_vertex(x, y);
}
//------------------------------------------------------------------------
template<class VC>
inline double path_base<VC>::last_x() const
{
return m_vertices.last_x();
}
//------------------------------------------------------------------------
template<class VC>
inline double path_base<VC>::last_y() const
{
return m_vertices.last_y();
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::vertex(unsigned idx, double* x, double* y) const
{
return m_vertices.vertex(idx, x, y);
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::command(unsigned idx) const
{
return m_vertices.command(idx);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::modify_vertex(unsigned idx, double x, double y)
{
m_vertices.modify_vertex(idx, x, y);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::modify_vertex(unsigned idx, double x, double y, unsigned cmd)
{
m_vertices.modify_vertex(idx, x, y, cmd);
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::modify_command(unsigned idx, unsigned cmd)
{
m_vertices.modify_command(idx, cmd);
}
//------------------------------------------------------------------------
template<class VC>
inline void path_base<VC>::rewind(unsigned path_id)
{
m_iterator = path_id;
}
//------------------------------------------------------------------------
template<class VC>
inline unsigned path_base<VC>::vertex(double* x, double* y)
{
if(m_iterator >= m_vertices.total_vertices()) return path_cmd_stop;
return m_vertices.vertex(m_iterator++, x, y);
}
//------------------------------------------------------------------------
template<class VC>
unsigned path_base<VC>::perceive_polygon_orientation(unsigned start,
unsigned end)
{
// Calculate signed area (double area to be exact)
//---------------------
unsigned np = end - start;
double area = 0.0;
unsigned i;
for(i = 0; i < np; i++)
{
double x1, y1, x2, y2;
m_vertices.vertex(start + i, &x1, &y1);
m_vertices.vertex(start + (i + 1) % np, &x2, &y2);
area += x1 * y2 - y1 * x2;
}
return (area < 0.0) ? path_flags_cw : path_flags_ccw;
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::invert_polygon(unsigned start, unsigned end)
{
unsigned i;
unsigned tmp_cmd = m_vertices.command(start);
--end; // Make "end" inclusive
// Shift all commands to one position
for(i = start; i < end; i++)
{
m_vertices.modify_command(i, m_vertices.command(i + 1));
}
// Assign starting command to the ending command
m_vertices.modify_command(end, tmp_cmd);
// Reverse the polygon
while(end > start)
{
m_vertices.swap_vertices(start++, end--);
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::invert_polygon(unsigned start)
{
// Skip all non-vertices at the beginning
while(start < m_vertices.total_vertices() &&
!is_vertex(m_vertices.command(start))) ++start;
// Skip all insignificant move_to
while(start+1 < m_vertices.total_vertices() &&
is_move_to(m_vertices.command(start)) &&
is_move_to(m_vertices.command(start+1))) ++start;
// Find the last vertex
unsigned end = start + 1;
while(end < m_vertices.total_vertices() &&
!is_next_poly(m_vertices.command(end))) ++end;
invert_polygon(start, end);
}
//------------------------------------------------------------------------
template<class VC>
unsigned path_base<VC>::arrange_polygon_orientation(unsigned start,
path_flags_e orientation)
{
if(orientation == path_flags_none) return start;
// Skip all non-vertices at the beginning
while(start < m_vertices.total_vertices() &&
!is_vertex(m_vertices.command(start))) ++start;
// Skip all insignificant move_to
while(start+1 < m_vertices.total_vertices() &&
is_move_to(m_vertices.command(start)) &&
is_move_to(m_vertices.command(start+1))) ++start;
// Find the last vertex
unsigned end = start + 1;
while(end < m_vertices.total_vertices() &&
!is_next_poly(m_vertices.command(end))) ++end;
if(end - start > 2)
{
if(perceive_polygon_orientation(start, end) != unsigned(orientation))
{
// Invert polygon, set orientation flag, and skip all end_poly
invert_polygon(start, end);
unsigned cmd;
while(end < m_vertices.total_vertices() &&
is_end_poly(cmd = m_vertices.command(end)))
{
m_vertices.modify_command(end++, set_orientation(cmd, orientation));
}
}
}
return end;
}
//------------------------------------------------------------------------
template<class VC>
unsigned path_base<VC>::arrange_orientations(unsigned start,
path_flags_e orientation)
{
if(orientation != path_flags_none)
{
while(start < m_vertices.total_vertices())
{
start = arrange_polygon_orientation(start, orientation);
if(is_stop(m_vertices.command(start)))
{
++start;
break;
}
}
}
return start;
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::arrange_orientations_all_paths(path_flags_e orientation)
{
if(orientation != path_flags_none)
{
unsigned start = 0;
while(start < m_vertices.total_vertices())
{
start = arrange_orientations(start, orientation);
}
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::flip_x(double x1, double x2)
{
unsigned i;
double x, y;
for(i = 0; i < m_vertices.total_vertices(); i++)
{
unsigned cmd = m_vertices.vertex(i, &x, &y);
if(is_vertex(cmd))
{
m_vertices.modify_vertex(i, x2 - x + x1, y);
}
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::flip_y(double y1, double y2)
{
unsigned i;
double x, y;
for(i = 0; i < m_vertices.total_vertices(); i++)
{
unsigned cmd = m_vertices.vertex(i, &x, &y);
if(is_vertex(cmd))
{
m_vertices.modify_vertex(i, x, y2 - y + y1);
}
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::translate(double dx, double dy, unsigned path_id)
{
unsigned num_ver = m_vertices.total_vertices();
for(; path_id < num_ver; path_id++)
{
double x, y;
unsigned cmd = m_vertices.vertex(path_id, &x, &y);
if(is_stop(cmd)) break;
if(is_vertex(cmd))
{
x += dx;
y += dy;
m_vertices.modify_vertex(path_id, x, y);
}
}
}
//------------------------------------------------------------------------
template<class VC>
void path_base<VC>::translate_all_paths(double dx, double dy)
{
unsigned idx;
unsigned num_ver = m_vertices.total_vertices();
for(idx = 0; idx < num_ver; idx++)
{
double x, y;
if(is_vertex(m_vertices.vertex(idx, &x, &y)))
{
x += dx;
y += dy;
m_vertices.modify_vertex(idx, x, y);
}
}
}
////////////////////////////////////////////////////////////////////////////////
//-----------------------------------------------------vertex_stl_storage
template<class Container> class vertex_stl_storage
{
public:
typedef typename Container::value_type vertex_type;
typedef typename vertex_type::value_type value_type;
void remove_all() { m_vertices.clear(); }
void free_all() { m_vertices.clear(); }
void add_vertex(double x, double y, unsigned cmd)
{
m_vertices.push_back(vertex_type(value_type(x),
value_type(y),
int8u(cmd)));
}
void modify_vertex(unsigned idx, double x, double y)
{
vertex_type& v = m_vertices[idx];
v.x = value_type(x);
v.y = value_type(y);
}
void modify_vertex(unsigned idx, double x, double y, unsigned cmd)
{
vertex_type& v = m_vertices[idx];
v.x = value_type(x);
v.y = value_type(y);
v.cmd = int8u(cmd);
}
void modify_command(unsigned idx, unsigned cmd)
{
m_vertices[idx].cmd = int8u(cmd);
}
void swap_vertices(unsigned v1, unsigned v2)
{
vertex_type t = m_vertices[v1];
m_vertices[v1] = m_vertices[v2];
m_vertices[v2] = t;
}
unsigned last_command() const
{
return m_vertices.size() ?
m_vertices[m_vertices.size() - 1].cmd :
path_cmd_stop;
}
unsigned last_vertex(double* x, double* y) const
{
if(m_vertices.size() == 0)
{
*x = *y = 0.0;
return path_cmd_stop;
}
return vertex(m_vertices.size() - 1, x, y);
}
unsigned prev_vertex(double* x, double* y) const
{
if(m_vertices.size() < 2)
{
*x = *y = 0.0;
return path_cmd_stop;
}
return vertex(m_vertices.size() - 2, x, y);
}
double last_x() const
{
return m_vertices.size() ? m_vertices[m_vertices.size() - 1].x : 0.0;
}
double last_y() const
{
return m_vertices.size() ? m_vertices[m_vertices.size() - 1].y : 0.0;
}
unsigned total_vertices() const
{
return m_vertices.size();
}
unsigned vertex(unsigned idx, double* x, double* y) const
{
const vertex_type& v = m_vertices[idx];
*x = v.x;
*y = v.y;
return v.cmd;
}
unsigned command(unsigned idx) const
{
return m_vertices[idx].cmd;
}
private:
Container m_vertices;
};
//-----------------------------------------------------------path_storage
typedef path_base<vertex_block_storage<double> > path_storage;
// Example of declarations path_storage with pod_bvector as a container
//-----------------------------------------------------------------------
//typedef path_base<vertex_stl_storage<pod_bvector<vertex_d> > > path_storage;
}
// Example of declarations path_storage with std::vector as a container
//---------------------------------------------------------------------------
//#include <vector>
//namespace agg
//{
// typedef path_base<vertex_stl_storage<std::vector<vertex_d> > > path_storage;
//}
#endif
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