The Drawable Objects are the PDF objects that can be laid out in a canvas. The drawable objects are derived from the PdfDrawableObject class which is a specialization of the PdfObject generic class.
The most important drawable objects are PdfHtml, PdfHtmlImage, PdfText, PdfImage, PdfBezierCurve, PdfEllipse, PdfEllipseArc, PdfEllipseSlice, PdfLine, PdfPolygon and PdfRectangle which are described in the sections below.