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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// 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
+//----------------------------------------------------------------------------
+//
+// classes curve3 and curve4
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CURVES_INCLUDED
+#define AGG_CURVES_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vertex_iterator.h"
+
+namespace agg
+{
+
+ // See Implemantation agg_curves.cpp
+
+
+ //------------------------------------------------------------------curve3
+ class curve3
+ {
+ public:
+ curve3() :
+ m_num_steps(0), m_step(0), m_scale(1.0) { }
+
+ curve3(double x1, double y1,
+ double x2, double y2,
+ double x3, double y3) :
+ m_num_steps(0), m_step(0), m_scale(1.0)
+ {
+ init(x1, y1, x2, y2, x3, y3);
+ }
+
+ void reset() { m_num_steps = 0; m_step = -1; }
+ void init(double x1, double y1,
+ double x2, double y2,
+ double x3, double y3);
+ void approximation_scale(double s) { m_scale = s; }
+ double approximation_scale() const { return m_scale; }
+
+ void rewind(unsigned id);
+ unsigned vertex(double* x, double* y);
+
+ typedef curve3 source_type;
+ typedef vertex_iterator<source_type> iterator;
+ iterator begin(unsigned id) { return iterator(*this, id); }
+ iterator end() { return iterator(path_cmd_stop); }
+
+ private:
+ int m_num_steps;
+ int m_step;
+ double m_scale;
+ double m_start_x;
+ double m_start_y;
+ double m_end_x;
+ double m_end_y;
+ double m_fx;
+ double m_fy;
+ double m_dfx;
+ double m_dfy;
+ double m_ddfx;
+ double m_ddfy;
+ double m_saved_fx;
+ double m_saved_fy;
+ double m_saved_dfx;
+ double m_saved_dfy;
+ };
+
+
+
+
+
+
+
+ //-----------------------------------------------------------------curve4
+ class curve4
+ {
+ public:
+ curve4() :
+ m_num_steps(0), m_step(0), m_scale(1.0) { }
+
+ curve4(double x1, double y1,
+ double x2, double y2,
+ double x3, double y3,
+ double x4, double y4) :
+ m_num_steps(0), m_step(0), m_scale(1.0)
+ {
+ init(x1, y1, x2, y2, x3, y3, x4, y4);
+ }
+
+ void reset() { m_num_steps = 0; m_step = -1; }
+ void init(double x1, double y1,
+ double x2, double y2,
+ double x3, double y3,
+ double x4, double y4);
+
+ void approximation_scale(double s) { m_scale = s; }
+ double approximation_scale() const { return m_scale; }
+
+ void rewind(unsigned id);
+ unsigned vertex(double* x, double* y);
+
+ typedef curve4 source_type;
+ typedef vertex_iterator<source_type> iterator;
+ iterator begin(unsigned id) { return iterator(*this, id); }
+ iterator end() { return iterator(path_cmd_stop); }
+
+ private:
+ int m_num_steps;
+ int m_step;
+ double m_scale;
+ double m_start_x;
+ double m_start_y;
+ double m_end_x;
+ double m_end_y;
+ double m_fx;
+ double m_fy;
+ double m_dfx;
+ double m_dfy;
+ double m_ddfx;
+ double m_ddfy;
+ double m_dddfx;
+ double m_dddfy;
+ double m_saved_fx;
+ double m_saved_fy;
+ double m_saved_dfx;
+ double m_saved_dfy;
+ double m_saved_ddfx;
+ double m_saved_ddfy;
+ };
+
+
+
+
+}
+
+#endif