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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4 (Public License)
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Anti-Grain Geometry - Version 2.4 Release Milano 3 (AggPas 2.4 RM3)
// Pascal Port By: Milan Marusinec alias Milano
// milan@marusinec.sk
// http://www.aggpas.org
// Copyright (c) 2005-2006
//
// 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
//
// [Pascal Port History] -----------------------------------------------------
//
// 19.01.2006-Milano: Complete Unit Port
// 18.01.2006-Milano: Unit port establishment
//
{ agg_vcgen_bspline.pas }
unit
agg_vcgen_bspline ;
INTERFACE
{$I agg_mode.inc }
uses
agg_basics ,
agg_bspline ,
agg_array ,
agg_vertex_source ;
{ TYPES DEFINITION }
type
status_e = (initial ,ready ,polygon ,end_poly ,stop );
vcgen_bspline_ptr = ^vcgen_bspline;
vcgen_bspline = object(vertex_source )
m_src_vertices : pod_deque;
m_spline_x ,
m_spline_y : bspline;
m_interpolation_step : double;
m_closed : unsigned;
m_status : status_e;
m_src_vertex : unsigned;
m_cur_abscissa ,
m_max_abscissa : double;
constructor Construct;
destructor Destruct; virtual;
procedure interpolation_step_(v : double );
function _interpolation_step : double;
// Vertex Generator Interface
procedure remove_all; virtual;
procedure add_vertex(x ,y : double; cmd : unsigned ); virtual;
// Vertex Source Interface
procedure rewind(path_id : unsigned ); virtual;
function vertex(x ,y : double_ptr ) : unsigned; virtual;
end;
{ GLOBAL PROCEDURES }
IMPLEMENTATION
{ LOCAL VARIABLES & CONSTANTS }
{ UNIT IMPLEMENTATION }
{ CONSTRUCT }
constructor vcgen_bspline.Construct;
begin
inherited Construct;
m_src_vertices.Construct(sizeof(point_type ) ,6 );
m_spline_x.Construct;
m_spline_y.Construct;
m_interpolation_step:=1.0 / 50.0;
m_closed:=0;
m_status:=initial;
m_src_vertex:=0;
end;
{ DESTRUCT }
destructor vcgen_bspline.Destruct;
begin
inherited Destruct;
m_src_vertices.Destruct;
m_spline_x.Destruct;
m_spline_y.Destruct;
end;
{ INTERPOLATION_STEP_ }
procedure vcgen_bspline.interpolation_step_;
begin
m_interpolation_step:=v;
end;
{ _INTERPOLATION_STEP }
function vcgen_bspline._interpolation_step;
begin
result:=m_interpolation_step;
end;
{ REMOVE_ALL }
procedure vcgen_bspline.remove_all;
begin
m_src_vertices.remove_all;
m_closed:=0;
m_status:=initial;
m_src_vertex:=0;
end;
{ ADD_VERTEX }
procedure vcgen_bspline.add_vertex;
var
pt : point_type;
begin
m_status:=initial;
if is_move_to(cmd ) then
begin
pt.x:=x;
pt.y:=y;
m_src_vertices.modify_last(@pt );
end
else
if is_vertex(cmd ) then
begin
pt.x:=x;
pt.y:=y;
m_src_vertices.add(@pt );
end
else
m_closed:=get_close_flag(cmd );
end;
{ REWIND }
procedure vcgen_bspline.rewind;
var
i : unsigned;
x : double;
begin
m_cur_abscissa:=0.0;
m_max_abscissa:=0.0;
m_src_vertex:=0;
if (m_status = initial ) and
(m_src_vertices.size > 2 ) then
begin
if m_closed <> 0 then
begin
m_spline_x.init(m_src_vertices.size + 8 );
m_spline_y.init(m_src_vertices.size + 8 );
m_spline_x.add_point(0.0 ,point_type_ptr(m_src_vertices.prev(m_src_vertices.size - 3 ) )^.x );
m_spline_y.add_point(0.0 ,point_type_ptr(m_src_vertices.prev(m_src_vertices.size - 3 ) )^.y );
m_spline_x.add_point(1.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 3 ) )^.x );
m_spline_y.add_point(1.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 3 ) )^.y );
m_spline_x.add_point(2.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 2 ) )^.x );
m_spline_y.add_point(2.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 2 ) )^.y );
m_spline_x.add_point(3.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 1 ) )^.x );
m_spline_y.add_point(3.0 ,point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 1 ) )^.y );
end
else
begin
m_spline_x.init(m_src_vertices.size );
m_spline_y.init(m_src_vertices.size );
end;
for i:=0 to m_src_vertices.size - 1 do
begin
if m_closed <> 0 then
x:=i + 4
else
x:=i;
m_spline_x.add_point(x ,point_type_ptr(m_src_vertices.array_operator(i ) )^.x );
m_spline_y.add_point(x ,point_type_ptr(m_src_vertices.array_operator(i ) )^.y );
end;
m_cur_abscissa:=0.0;
m_max_abscissa:=m_src_vertices.size - 1;
if m_closed <> 0 then
begin
m_cur_abscissa:=4.0;
m_max_abscissa:=m_max_abscissa + 5.0;
m_spline_x.add_point(
m_src_vertices.size + 4 ,
point_type_ptr(m_src_vertices.array_operator(0 ) )^.x );
m_spline_y.add_point(
m_src_vertices.size + 4 ,
point_type_ptr(m_src_vertices.array_operator(0 ) )^.y );
m_spline_x.add_point(
m_src_vertices.size + 5 ,
point_type_ptr(m_src_vertices.array_operator(1 ) )^.x );
m_spline_y.add_point(
m_src_vertices.size + 5 ,
point_type_ptr(m_src_vertices.array_operator(1 ) )^.y );
m_spline_x.add_point(
m_src_vertices.size + 6 ,
point_type_ptr(m_src_vertices.array_operator(2 ) )^.x );
m_spline_y.add_point(
m_src_vertices.size + 6 ,
point_type_ptr(m_src_vertices.array_operator(2 ) )^.y );
m_spline_x.add_point(
m_src_vertices.size + 7 ,
point_type_ptr(m_src_vertices.next(2 ) )^.x );
m_spline_y.add_point(
m_src_vertices.size + 7 ,
point_type_ptr(m_src_vertices.next(2 ) )^.y );
end;
m_spline_x.prepare;
m_spline_y.prepare;
end;
m_status:=ready;
end;
{ VERTEX }
function vcgen_bspline.vertex;
var
cmd : unsigned;
label
_next ,_ready ,_polygon ;
begin
cmd:=path_cmd_line_to;
_next:
while not is_stop(cmd ) do
case m_status of
initial :
begin
rewind(0 );
goto _ready;
end;
ready :
_ready:
begin
if m_src_vertices.size < 2 then
begin
cmd:=path_cmd_stop;
goto _next;
end;
if m_src_vertices.size = 2 then
begin
x^:=point_type_ptr(m_src_vertices.array_operator(m_src_vertex ) )^.x;
y^:=point_type_ptr(m_src_vertices.array_operator(m_src_vertex ) )^.y;
inc(m_src_vertex );
if m_src_vertex = 1 then
begin
result:=path_cmd_move_to;
exit;
end;
if m_src_vertex = 2 then
begin
result:=path_cmd_line_to;
exit;
end;
cmd:=path_cmd_stop;
goto _next;
end;
cmd:=path_cmd_move_to;
m_status:=polygon;
m_src_vertex:=0;
goto _polygon;
end;
polygon :
_polygon:
begin
if m_cur_abscissa >= m_max_abscissa then
if m_closed <> 0 then
begin
m_status:=end_poly;
goto _next;
end
else
begin
x^:=point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 1 ) )^.x;
y^:=point_type_ptr(m_src_vertices.array_operator(m_src_vertices.size - 1 ) )^.y;
m_status:=end_poly;
result :=path_cmd_line_to;
exit;
end;
x^:=m_spline_x.get_stateful(m_cur_abscissa );
y^:=m_spline_y.get_stateful(m_cur_abscissa );
inc(m_src_vertex );
m_cur_abscissa:=m_cur_abscissa + m_interpolation_step;
if m_src_vertex = 1 then
result:=path_cmd_move_to
else
result:=path_cmd_line_to;
exit;
end;
end_poly :
begin
m_status:=stop;
result :=path_cmd_end_poly or m_closed;
exit;
end;
stop :
begin
result:=path_cmd_stop;
exit;
end;
end;
result:=cmd;
end;
END.
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