122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#ifndef AGG_VPGEN_CLIP_POLYLINE_INCLUDED
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#define AGG_VPGEN_CLIP_POLYLINE_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//======================================================vpgen_clip_polyline
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//
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// See Implementation agg_vpgen_clip_polyline.cpp
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//
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class vpgen_clip_polyline
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{
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public:
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vpgen_clip_polyline() :
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m_clip_box(0, 0, 1, 1),
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m_x1(0),
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m_y1(0),
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m_f1(0),
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m_x2(0),
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m_y2(0),
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m_f2(0),
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m_num_vertices(0),
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m_vertex(0)
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{
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}
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void clip_box(double x1, double y1, double x2, double y2)
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{
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m_clip_box.x1 = x1;
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m_clip_box.y1 = y1;
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m_clip_box.x2 = x2;
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m_clip_box.y2 = y2;
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m_clip_box.normalize();
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}
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double x1() const { return m_clip_box.x1; }
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double y1() const { return m_clip_box.y1; }
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double x2() const { return m_clip_box.x2; }
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double y2() const { return m_clip_box.y2; }
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static bool auto_close() { return false; }
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static bool auto_unclose() { return true; }
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void reset();
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void move_to(double x, double y);
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void line_to(double x, double y);
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unsigned vertex(double* x, double* y);
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private:
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enum clipping_flags_def
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{
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clip_x1 = 1,
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clip_x2 = 2,
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clip_y1 = 4,
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clip_y2 = 8
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};
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// Determine the clipping code of the vertex according to the
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// Cyrus-Beck line clipping algorithm
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//--------------------------------------------------------------------
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unsigned clipping_flags_x(double x)
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{
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unsigned f = 0;
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if(x < m_clip_box.x1) f |= clip_x1;
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if(x > m_clip_box.x2) f |= clip_x2;
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return f;
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}
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unsigned clipping_flags_y(double y)
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{
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unsigned f = 0;
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if(y < m_clip_box.y1) f |= clip_y1;
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if(y > m_clip_box.y2) f |= clip_y2;
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return f;
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}
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unsigned clipping_flags(double x, double y)
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{
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return clipping_flags_x(x) | clipping_flags_y(y);
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}
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bool move_point(double& x, double& y, unsigned& flags);
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void clip_line_segment();
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private:
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rect_d m_clip_box;
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double m_x1;
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double m_y1;
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unsigned m_f1;
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double m_x2;
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double m_y2;
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unsigned m_f2;
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double m_x[2];
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double m_y[2];
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unsigned m_cmd[2];
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unsigned m_num_vertices;
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unsigned m_vertex;
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};
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}
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#endif
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