Historically, the PostScript-like PDF code is generated from a source PostScript file. PDF is largely based on PostScript, but simplified to remove flow control features like these, while graphics commands equivalent to lineto remain. It can handle graphics and standard features of programming languages such as if statements and loop commands. PostScript is a page description language run in an interpreter to generate an image, a process requiring many resources. A structured storage system to bundle these elements and any associated content into a single file, with data compression where appropriate.A font-embedding/replacement system to allow fonts to travel with the documents.An equivalent subset of the PostScript page description programming language but in declarative form, for generating the layout and graphics.In later PDF revisions, a PDF document can also support links (inside document or web page), forms, JavaScript (initially available as a plugin for Acrobat 3.0), or any other types of embedded contents that can be handled using plug-ins. Raster graphics for photographs and other types of images.Vector graphics for illustrations and designs that consist of shapes and lines. ![]()
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