kc3-lang/ftgl/src/FTContour.cpp

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• Hash : 43cb23ae
  Author :
  Date : 2002-12-16T00:40:12
  

  Removed unused constants
  
  

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• src/FTContour.cpp

• #include "FTContour.h"
  
  static const float BEZIER_STEP_SIZE = 0.2f;
  
  
  FTContour::FTContour( FT_Vector* contour, char* pointTags, unsigned int numberOfPoints)
  {
      for( unsigned int pointIndex = 0; pointIndex < numberOfPoints; ++ pointIndex)
      {
          char pointTag = pointTags[pointIndex];
          
          if( pointTag == FT_Curve_Tag_On)
          {
              AddPoint( FTPoint( contour[pointIndex]));
              continue;
          }
          
          FTPoint controlPoint( contour[pointIndex]);
          FTPoint previousPoint = ( 0 == pointIndex)
                                  ? FTPoint( contour[numberOfPoints - 1])
                                  : pointList[pointList.size() - 1];
  
          FTPoint nextPoint = ( pointIndex == numberOfPoints - 1)
                              ? pointList[0]
                              : FTPoint( contour[pointIndex + 1]);
  
          if( pointTag == FT_Curve_Tag_Conic)
          {
              char nextPointTag = ( pointIndex == numberOfPoints - 1)
                                  ? pointTags[0]
                                  : pointTags[pointIndex + 1];
              
              while( nextPointTag == FT_Curve_Tag_Conic)
              {
                  nextPoint = FTPoint( static_cast<float>( controlPoint.x + nextPoint.x) * 0.5f,
                                       static_cast<float>( controlPoint.y + nextPoint.y) * 0.5f,
                                       0);
  
                  bValues[0][0] = previousPoint.x; bValues[0][1] = previousPoint.y;
                  bValues[1][0] = controlPoint.x;  bValues[1][1] = controlPoint.y;
                  bValues[2][0] = nextPoint.x;     bValues[2][1] = nextPoint.y;
                  
                  evaluateQuadraticCurve();
                  ++pointIndex;
                  
                  previousPoint = nextPoint;
                  controlPoint = FTPoint( contour[pointIndex]);
                  nextPoint = ( pointIndex == numberOfPoints - 1)
                              ? pointList[0]
                              : FTPoint( contour[pointIndex + 1]);
                  nextPointTag = ( pointIndex == numberOfPoints - 1)
                                 ? pointTags[0]
                                 : pointTags[pointIndex + 1];
              }
              
              bValues[0][0] = previousPoint.x; bValues[0][1] = previousPoint.y;
              bValues[1][0] = controlPoint.x;  bValues[1][1] = controlPoint.y;
              bValues[2][0] = nextPoint.x;     bValues[2][1] = nextPoint.y;
              
              evaluateQuadraticCurve();
              continue;
          }
  
          if( pointTag == FT_Curve_Tag_Cubic)
          {
              FTPoint controlPoint2 = nextPoint;
              
              FTPoint nextPoint = ( pointIndex == numberOfPoints - 2)
                                  ? pointList[0]
                                  : FTPoint( contour[pointIndex + 2]);
              
              bValues[0][0] = previousPoint.x; bValues[0][1] = previousPoint.y;
              bValues[1][0] = controlPoint.x;  bValues[1][1] = controlPoint.y;
              bValues[2][0] = controlPoint2.x; bValues[2][1] = controlPoint2.y;
              bValues[3][0] = nextPoint.x;     bValues[3][1] = nextPoint.y;
          
              evaluateCubicCurve();
              ++pointIndex;
              continue;
          }
      }
  }
  
  
  void FTContour::AddPoint( FTPoint point)
  {
      if( pointList.empty() || point != pointList[pointList.size() - 1])
      {
          pointList.push_back( point);
      }
  }
  
  
  void FTContour::evaluateQuadraticCurve()
  {
      for( unsigned int i = 0; i <= ( 1.0f / BEZIER_STEP_SIZE); i++)
      {
          float tempBValues[2][2];
  
          float t = static_cast<float>(i) * BEZIER_STEP_SIZE;
  
          tempBValues[0][0] = (1.0f - t) * bValues[0][0] + t * bValues[1][0];
          tempBValues[0][1] = (1.0f - t) * bValues[0][1] + t * bValues[1][1];
      
          tempBValues[1][0] = (1.0f - t) * bValues[1][0] + t * bValues[2][0];
          tempBValues[1][1] = (1.0f - t) * bValues[1][1] + t * bValues[2][1];
          
          tempBValues[0][0] = (1.0f - t) * tempBValues[0][0] + t * tempBValues[1][0];
          tempBValues[0][1] = (1.0f - t) * tempBValues[0][1] + t * tempBValues[1][1];
      
          AddPoint( FTPoint( tempBValues[0][0], tempBValues[0][1], 0.0f));
      }
  }
  
  void FTContour::evaluateCubicCurve()
  {
      for( unsigned int i = 0; i <= ( 1.0f / BEZIER_STEP_SIZE); i++)
      {
          float tempBValues[3][2];
  
          float t = static_cast<float>(i) * BEZIER_STEP_SIZE;
  
          tempBValues[0][0] = (1.0f - t) * bValues[0][0] + t * bValues[1][0];
          tempBValues[0][1] = (1.0f - t) * bValues[0][1] + t * bValues[1][1];
      
          tempBValues[1][0] = (1.0f - t) * bValues[1][0] + t * bValues[2][0];
          tempBValues[1][1] = (1.0f - t) * bValues[1][1] + t * bValues[2][1];
          
          tempBValues[2][0] = (1.0f - t) * bValues[2][0] + t * bValues[3][0];
          tempBValues[2][1] = (1.0f - t) * bValues[2][1] + t * bValues[3][1];
          
          tempBValues[0][0] = (1.0f - t) * tempBValues[0][0] + t * tempBValues[1][0];
          tempBValues[0][1] = (1.0f - t) * tempBValues[0][1] + t * tempBValues[1][1];
      
          tempBValues[1][0] = (1.0f - t) * tempBValues[1][0] + t * tempBValues[2][0];
          tempBValues[1][1] = (1.0f - t) * tempBValues[1][1] + t * tempBValues[2][1];
          
          tempBValues[0][0] = (1.0f - t) * tempBValues[0][0] + t * tempBValues[1][0];
          tempBValues[0][1] = (1.0f - t) * tempBValues[0][1] + t * tempBValues[1][1];
      
          AddPoint( FTPoint( tempBValues[0][0], tempBValues[0][1], 0.0f));
      }
  }
  
  

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