ossimPotraceTool::Path Class Reference

Public Member Functions
	Path ()
	~Path ()
void	addPotraceCurve (potrace_curve_t &curve, int segment)

Public Attributes
std::vector< ossimDpt >	vertices
bool	closed

Detailed Description

Definition at line 42 of file ossimPotraceTool.h.

Constructor & Destructor Documentation

Path()

ossimPotraceTool::Path::Path ( )

inline

Definition at line 45 of file ossimPotraceTool.h.

: closed(true) {}

~Path()

ossimPotraceTool::Path::~Path

(

)

Definition at line 525 of file ossimPotraceTool.cpp.

References vertices.

{
   vertices.clear();
}

Member Function Documentation

addPotraceCurve()

void ossimPotraceTool::Path::addPotraceCurve	(	potrace_curve_t &	curve,
		int	segment
	)

Definition at line 531 of file ossimPotraceTool.cpp.

References potrace_curve_s::c, POTRACE_CORNER, potrace_curve_s::tag, potrace_dpoint_s::x, ossimDpt::x, x, potrace_dpoint_s::y, ossimDpt::y, and y.

Referenced by ossimPotraceTool::transformLineStrings().

{
   potrace_dpoint_t *c = curve.c[segment];
   if (curve.tag[segment] == POTRACE_CORNER)
   {
      // Just add next connected line segment
      ossimDpt v1 (c[1].x, c[1].y);
      ossimDpt v2 (c[2].x, c[2].y);
      vertices.push_back(v1);
      vertices.push_back(v2);
      //cout <<"    Added corners    v1:"<<v1<<endl;
      //cout <<"                     v2:"<<v2<<endl;
   }
   else
   {
      // Need to convert bezier curve representation to line segments:
      ossimDpt v0;
      ossimDpt v1 (c[0].x, c[0].y);
      ossimDpt v2 (c[1].x, c[1].y);
      ossimDpt v3 (c[2].x, c[2].y);

      // Need the first vertex from the previous segment if available:
      if (segment == 0)
         v0 = v1;
      else
      {
         c = curve.c[segment-1];
         v0.x = c[2].x;
         v0.y = c[2].y;
      }
      //cout <<"    Processing curve v0:"<<v0<<endl;
      //cout <<"                     v1:"<<v1<<endl;
      //cout <<"                     v2:"<<v2<<endl;
      //cout <<"                     v3:"<<v3<<endl;

      // Now loop to extract line segments from bezier curve:
      double step, t, s;
      ossimDpt vertex;
      step = 1.0 / 8.0;
      t = step;
      for (int i=0; i<8; i++)
      {
         s = 1.0 - t;
         vertex.x = s*s*s*v0.x + 3*(s*s*t)*v1.x + 3*(t*t*s)*v2.x + t*t*t*v3.x;
         vertex.y = s*s*s*v0.y + 3*(s*s*t)*v1.y + 3*(t*t*s)*v2.y + t*t*t*v3.y;
         vertices.push_back(vertex);
         t += step;
         //cout <<"    added vertex:"<<vertex<<endl;
      }
   }
}

Member Data Documentation

closed

bool ossimPotraceTool::Path::closed

Definition at line 49 of file ossimPotraceTool.h.

Referenced by ossimPotraceTool::transformLineStrings().

vertices

std::vector<ossimDpt> ossimPotraceTool::Path::vertices

Definition at line 48 of file ossimPotraceTool.h.

Referenced by ossimPotraceTool::transformLineStrings(), and ~Path().

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The documentation for this class was generated from the following files:

• ossimPotraceTool.h
• ossimPotraceTool.cpp