Repo created

3party/agg/agg_vcgen_vertex_sequence.h

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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_VCGEN_VERTEX_SEQUENCE_INCLUDED
+#define AGG_VCGEN_VERTEX_SEQUENCE_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vertex_sequence.h"
+#include "agg_shorten_path.h"
+
+namespace agg
+{
+
+    //===================================================vcgen_vertex_sequence
+    class vcgen_vertex_sequence
+    {
+    public:
+        typedef vertex_dist_cmd                 vertex_type;
+        typedef vertex_sequence<vertex_type, 6> vertex_storage;
+
+        vcgen_vertex_sequence() :
+            m_flags(0),
+            m_cur_vertex(0),
+            m_shorten(0.0),
+            m_ready(false)
+        {
+        }
+
+        // Vertex Generator Interface
+        void remove_all();
+        void add_vertex(double x, double y, unsigned cmd);
+
+        // Vertex Source Interface
+        void     rewind(unsigned path_id);
+        unsigned vertex(double* x, double* y);
+
+        void shorten(double s) { m_shorten = s; }
+        double shorten() const { return m_shorten; }
+
+    private:
+        vcgen_vertex_sequence(const vcgen_vertex_sequence&);
+        const vcgen_vertex_sequence& operator = (const vcgen_vertex_sequence&);
+
+        vertex_storage m_src_vertices;
+        unsigned       m_flags;
+        unsigned       m_cur_vertex;
+        double         m_shorten;
+        bool           m_ready;
+    };
+
+
+    //------------------------------------------------------------------------
+    inline void vcgen_vertex_sequence::remove_all()
+    {
+        m_ready = false;
+        m_src_vertices.remove_all();
+        m_cur_vertex = 0;
+        m_flags = 0;
+    }
+
+    //------------------------------------------------------------------------
+    inline void vcgen_vertex_sequence::add_vertex(double x, double y, unsigned cmd)
+    {
+        m_ready = false;
+        if(is_move_to(cmd))
+        {
+            m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd));
+        }
+        else
+        {
+            if(is_vertex(cmd))
+            {
+                m_src_vertices.add(vertex_dist_cmd(x, y, cmd));
+            }
+            else
+            {
+                m_flags = cmd & path_flags_mask;
+            }
+        }
+    }
+
+
+    //------------------------------------------------------------------------
+    inline void vcgen_vertex_sequence::rewind(unsigned) 
+    { 
+        if(!m_ready)
+        {
+            m_src_vertices.close(is_closed(m_flags));
+            shorten_path(m_src_vertices, m_shorten, get_close_flag(m_flags));
+        }
+        m_ready = true;
+        m_cur_vertex = 0; 
+    }
+
+    //------------------------------------------------------------------------
+    inline unsigned vcgen_vertex_sequence::vertex(double* x, double* y)
+    {
+        if(!m_ready)
+        {
+            rewind(0);
+        }
+
+        if(m_cur_vertex == m_src_vertices.size())
+        {
+            ++m_cur_vertex;
+            return path_cmd_end_poly | m_flags;
+        }
+
+        if(m_cur_vertex > m_src_vertices.size())
+        {
+            return path_cmd_stop;
+        }
+
+        vertex_type& v = m_src_vertices[m_cur_vertex++];
+        *x = v.x;
+        *y = v.y;
+        return v.cmd;
+    }
+
+
+}
+
+#endif