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  1. // Draw an ellipse inside a rectangle using Bézier curves. Specify a square to draw a circle
  2. void DrawEllipse(const IJawsMakoPtr jawsMako, IDOMFixedPagePtr& fixedPage, const FRect rect,
  3.     const double strokeThickness, const IDOMBrushPtr solidBrush)
  4. {
  5.     // We can approximate a circle using four béziers. This is the parameter that is
  6.     // used inside Jaws for this purpose
  7.     double l = ((0.7071067812 - 0.5) * 8.0 / 3.0);
  8.  
  9.     // And so we will offset the bézier control points by half that amount as the entire
  10.     // circle is one unit in diameter.
  11.     double c = l / 2.0;
  12.  
  13.     // Create the geometry
  14.     IDOMPathGeometryPtr geometry = createInstance<IDOMPathGeometry>(jawsMako);
  15.  
  16.     // Scale to required size. As what we are scaling is 1x1, the scaling factor is simply the rect dimensions
  17.     geometry->setRenderTransform(FMatrix(rect.dX , 0, 0, rect.dY, rect.x, rect.y));
  18.  
  19.     // And a figure. We start at the top and head clockwise. But remember
  20.     // we are upside down compared to PDF, so the direction and start point changes.
  21.     IDOMPathFigure::Data params;
  22.     params.startPoint = FPoint(0.5, 0.0);
  23.     params.isClosed = true;
  24.     params.isFilled = true;
  25.     IDOMPathFigurePtr figure = createInstance<IDOMPathFigure>(jawsMako);
  26.     figure->init(&params);
  27.  
  28.     // And finally the bézier segment
  29.     IDOMPolyBezierSegmentPtr segment = createInstance<IDOMPolyBezierSegment>(jawsMako);
  30.  
  31.     // With the points as follows
  32.     segment->addPoint(FPoint(0.5 + c, 0.0));
  33.     segment->addPoint(FPoint(1.0, 0.5 - c));
  34.     segment->addPoint(FPoint(1.0, 0.5));
  35.  
  36.     segment->addPoint(FPoint(1.0, 0.5 + c));
  37.     segment->addPoint(FPoint(0.5 + c, 1.0));
  38.     segment->addPoint(FPoint(0.5, 1.0));
  39.  
  40.     segment->addPoint(FPoint(0.5 - c, 1.0));
  41.     segment->addPoint(FPoint(0.0, 0.5 + c));
  42.     segment->addPoint(FPoint(0.0, 0.5));
  43.  
  44.     segment->addPoint(FPoint(0.0, 0.5 - c));
  45.     segment->addPoint(FPoint(0.5 - c, 0.0));
  46.     segment->addPoint(FPoint(0.5, 0.0));
  47.  
  48.     figure->addSegment(segment);
  49.     geometry->addFigure(figure);
  50.  
  51.     // And now draw a path using the marker brush
  52.     IDOMPathNodePtr path;
  53.     if (strokeThickness) {
  54.         path = IDOMPathNode::createStroked(jawsMako, geometry, solidBrush);
  55.         path->setStrokeThickness(strokeThickness);
  56.     }
  57.     else
  58.         path = IDOMPathNode::createFilled(jawsMako, geometry, solidBrush);
  59.  
  60.     // Finally add to the fixed page
  61.     fixedPage->appendChild(path);
  62. }
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