ossimActiveEdgeTableHelper Class Reference

#include <ossimActiveEdgeTable.h>

Public Member Functions
	ossimActiveEdgeTableHelper (ossimActiveEdgeTable *edgeTable)
bool	advanceScanLine ()
bool	getNextLineSegment (ossimIpt &start, ossimIpt &end)
ossim_int32	getCurrentScanLine () const
ossim_int32	getYShift () const

Protected Attributes
ossimActiveEdgeTable *	theEdgeTable
bool	theTableInitializedFlag
std::list< ossimActiveEdgeTableNode >::const_iterator	theIterator

Detailed Description

Definition at line 116 of file ossimActiveEdgeTable.h.

Constructor & Destructor Documentation

ossimActiveEdgeTableHelper()

ossimActiveEdgeTableHelper::ossimActiveEdgeTableHelper

(

ossimActiveEdgeTable *

edgeTable

)

Definition at line 149 of file ossimActiveEdgeTable.cpp.

   :theEdgeTable(edgeTable),
    theTableInitializedFlag(false)
{
}

Member Function Documentation

advanceScanLine()

bool ossimActiveEdgeTableHelper::advanceScanLine

(

)

Definition at line 155 of file ossimActiveEdgeTable.cpp.

References ossimActiveEdgeTable::initializeActiveList(), ossimActiveEdgeTable::mergeCurrentScanLine(), ossimActiveEdgeTable::theActiveList, ossimActiveEdgeTable::theCurrentScanLine, theEdgeTable, theIterator, theTableInitializedFlag, and ossimActiveEdgeTable::updateActiveEdges().

Referenced by getNextLineSegment().

{
   if(!theEdgeTable) return false;
   
   if(!theTableInitializedFlag)
   {
      theEdgeTable->initializeActiveList();
      theTableInitializedFlag = true;
   }
   else
   {
      ++theEdgeTable->theCurrentScanLine;
      theEdgeTable->updateActiveEdges();
      theEdgeTable->mergeCurrentScanLine();
   }
   
   theIterator = theEdgeTable->theActiveList.begin();
   
   return (theEdgeTable->theActiveList.size());
}

getCurrentScanLine()

ossim_int32 ossimActiveEdgeTableHelper::getCurrentScanLine ( ) const

inline

Definition at line 126 of file ossimActiveEdgeTable.h.

References ossimActiveEdgeTable::getCurrentScanLine(), and theEdgeTable.

      {
         if(theEdgeTable)
         {
            return theEdgeTable->getCurrentScanLine();
         }
         return 0;
      }

getNextLineSegment()

bool ossimActiveEdgeTableHelper::getNextLineSegment	(	ossimIpt &	start,
		ossimIpt &	end
	)

Definition at line 176 of file ossimActiveEdgeTable.cpp.

References advanceScanLine(), ossimActiveEdgeTable::getCurrentScanLine(), getYShift(), ossimActiveEdgeTable::theActiveList, theEdgeTable, theIterator, theTableInitializedFlag, ossimIpt::x, and y.

{
   if(!theEdgeTable) return false;
   if(!theTableInitializedFlag) advanceScanLine();
   
   if(theIterator == theEdgeTable->theActiveList.end())
   {
      return false;
   }
   else
   {
      int y = theEdgeTable->getCurrentScanLine()+getYShift();
      
      start = ossimIpt(ossim::round<int>((*theIterator).theCurrentX),
                       y);
      ++theIterator;
      if(theIterator == theEdgeTable->theActiveList.end())
      {
         end = start;
      }
      else
      {
         end = ossimIpt( ossim::round<int>((*theIterator).theCurrentX),
                         y);
         
         ++theIterator;
      }
   }

   if(start.x > end.x)
   {
      swap(start.x, end.x);
   }
   return true;
}

getYShift()

ossim_int32 ossimActiveEdgeTableHelper::getYShift ( ) const

inline

Definition at line 134 of file ossimActiveEdgeTable.h.

References ossimActiveEdgeTable::getYShift(), and theEdgeTable.

Referenced by getNextLineSegment().

      {
         if(theEdgeTable)
         {
            return theEdgeTable->getYShift();
         }
         return 0;         
      }

Member Data Documentation

theEdgeTable

ossimActiveEdgeTable* ossimActiveEdgeTableHelper::theEdgeTable

protected

Definition at line 143 of file ossimActiveEdgeTable.h.

Referenced by advanceScanLine(), getCurrentScanLine(), getNextLineSegment(), and getYShift().

theIterator

std::list<ossimActiveEdgeTableNode>::const_iterator ossimActiveEdgeTableHelper::theIterator

protected

Definition at line 146 of file ossimActiveEdgeTable.h.

Referenced by advanceScanLine(), and getNextLineSegment().

theTableInitializedFlag

bool ossimActiveEdgeTableHelper::theTableInitializedFlag

protected

Definition at line 144 of file ossimActiveEdgeTable.h.

Referenced by advanceScanLine(), and getNextLineSegment().

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

• ossimActiveEdgeTable.h
• ossimActiveEdgeTable.cpp