/// <summary>
/// Add circle primitive to the page
/// </summary>
public PathElement AddCircle(float centerX, float centerY, float r, PdfDrawStyle borderStyle)
{
var path = new PathElement(centerX - r, centerY, borderStyle);
path.IsClosed = true;
path.AddBezier(centerX - r, centerY + Constants.SQRT_TWO * r, centerX + r, centerY + Constants.SQRT_TWO * r, centerX + r, centerY);
path.AddBezier(centerX + r, centerY - Constants.SQRT_TWO * r, centerX - r, centerY - Constants.SQRT_TWO * r, centerX - r, centerY);
Add(path);
return(path);
}