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Diffstat (limited to 'src/agg/agg_path_storage.h')
| -rw-r--r-- | src/agg/agg_path_storage.h | 1582 |
1 files changed, 1582 insertions, 0 deletions
diff --git a/src/agg/agg_path_storage.h b/src/agg/agg_path_storage.h new file mode 100644 index 000000000..f55c89957 --- /dev/null +++ b/src/agg/agg_path_storage.h @@ -0,0 +1,1582 @@ +//---------------------------------------------------------------------------- +// 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 <string.h> +#include <math.h> +#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(Container& data, bool closed) : + m_container(&data), + m_index(-1), + m_closed(closed), + m_stop(false) + {} + + void init(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: + 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, y; + 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, y; + 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); + } + } + } + + + //-------------------------------------------------------------------- + // If the end points of a path are very, very close then make them + // exactly equal so that the stroke converter is not confused. + //-------------------------------------------------------------------- + unsigned align_path(unsigned idx = 0) + { + if (idx >= total_vertices() || !is_move_to(command(idx))) + { + return total_vertices(); + } + + double start_x, start_y; + for (; idx < total_vertices() && is_move_to(command(idx)); ++idx) + { + vertex(idx, &start_x, &start_y); + } + while (idx < total_vertices() && is_drawing(command(idx))) + ++idx; + + double x, y; + if (is_drawing(vertex(idx - 1, &x, &y)) && + is_equal_eps(x, start_x, 1e-8) && + is_equal_eps(y, start_y, 1e-8)) + { + modify_vertex(idx - 1, start_x, start_y); + } + + while (idx < total_vertices() && !is_move_to(command(idx))) + ++idx; + return idx; + } + + void align_all_paths() + { + for (unsigned i = 0; i < total_vertices(); i = align_path(i)); + } + + + 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; + } + } + } + + //------------------------------------------------------------------------ + 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> > > stl_path_storage; +//} + + + + +#endif |