These are all good observations, but they just follow on from PostScript, which is what the PDF is based on.
In 1987 I started working at a desktop publishing company and was assigned the job of rationalizing the printer drivers. I quickly discovered that while most laser printers had their origin at the top left corner, the Apple LaserWriter (a PostScript printer) had its origin at the bottom left corner. So for most printers, going down the page meant increasing y values, but for the LaserWriter it meant a decreasing y value.
As you describe, joining lines could be done by filling out a triangle (meaning lines meeting at a small angle left a big elbow), by chopping off the triangle (making lines meeting at 90 degrees have a 45 degree corner) or by having a rounded corner. PostScript is very flexible that way, but can also be quite CPU-intensive.
Adobe's Red Book and Blue Book were my PostScript bibles back then.
Alex / talexb / Toronto
"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] |