12033 2006-12-29 20:58:39 -0800 SVG needs ability to calculate path lengths 2006-12-31 14:08:20 -0800 1 1 1 Unclassified WebKit SVG 420+ Mac OS X 10.4 RESOLVED FIXED P2 Normal --- 11975 1 eric eric zimmermann oldest_to_newest 38940 0 eric 2006-12-29 20:58:39 -0800 SVG needs ability to calculate path lengths This is arguably a platform bug as much as an SVG bug. SVG requires the ability to calculate path lengths. Both total path length, as well as the ability to identify a segment at a given length along a path. Calculating the length of a bezier curve is non-trivial, and most algorithms use successive approximation of the curve length. We have several options here: 1. I expect CoreGraphics (or some other library on OS X) has this functionality (possibly not via public methods) that with a little help from the Apple folks, we could find and expose via WebKitSystemInterface. 2. mozilla has their own code for this: http://lxr.mozilla.org/seamonkey/source/content/svg/content/src/nsSVGPathSeg.cpp#90 which we potentially could borrow, since I believe mozilla's triple license is compatible with WebKit's BSD/LGPL licensing. 4. There may be some other library or code snippet out there that we could use 5. We could write our own. I'm sure one of us has a CS book which documents a decent algorithm or two. There are also various guides on the web: (e.g. http://72.14.203.104/search?q=cache:lXe763sRSqMJ:www.cs.uiowa.edu/~kearney/22c196Spring03/ArcLengthParameterization.ppt+approximate+bezier+curve+length&hl=en&gl=us&ct=clnk&cd=5&client=safari) In any case, this will require a non-trivial amount of effort, but the results of which enable quite a few SVG features (including text-on-path). 38937 1 12116 eric 2006-12-29 23:27:54 -0800 Created attachment 12116 first (incomplete) stab What can I say? I felt inspired. It's kinda amusing how the 100+ lines of mozilla code which I used to start this, *completely* morphed and turned into about 20 lines of WebKit code. This is still not done. This only supports calculating path lengths from Path objects, not yet from SVGPathSegList objects, but that second part won't be hard to add. When adding the SVGPathSegList code, we'll also add the ability to walk a path and find the segment at a specific length. The only tricky part about adding the SVGPathSegList support is handling SVG Arc segments. There is additional mozilla code we can use to convert from Arcs to curves however. 38656 2 12136 eric 2006-12-31 10:45:03 -0800 Created attachment 12136 Working patch I decided to chuck the little remaining mozilla code and re-wrote it. We use a similar text length algorithm, but (IMO) a much nicer implementation thereof. 38659 3 eric 2006-12-31 12:00:57 -0800 *** Bug 11975 has been marked as a duplicate of this bug. *** 38669 4 sam 2006-12-31 14:08:20 -0800 Landed in r18493. 12116 2006-12-29 23:27:54 -0800 2006-12-31 10:45:03 -0800 first (incomplete) stab stab.patch text/plain 14056 eric SW5kZXg6IHBsYXRmb3JtL2dyYXBoaWNzL1BhdGhMZW5ndGhTdXBwb3J0LmgKPT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQot LS0gcGxhdGZvcm0vZ3JhcGhpY3MvUGF0aExlbmd0aFN1cHBvcnQuaAkocmV2aXNpb24gMCkKKysr IHBsYXRmb3JtL2dyYXBoaWNzL1BhdGhMZW5ndGhTdXBwb3J0LmgJKHJldmlzaW9uIDApCkBAIC0w LDAgKzEsNDQgQEAKKy8qCisgKiBDb3B5cmlnaHQgKEMpIDIwMDYgRXJpYyBTZWlkZWwgPGVyaWNA d2Via2l0Lm9yZz4KKyAqCisgKiBSZWRpc3RyaWJ1dGlvbiBhbmQgdXNlIGluIHNvdXJjZSBhbmQg YmluYXJ5IGZvcm1zLCB3aXRoIG9yIHdpdGhvdXQKKyAqIG1vZGlmaWNhdGlvbiwgYXJlIHBlcm1p dHRlZCBwcm92aWRlZCB0aGF0IHRoZSBmb2xsb3dpbmcgY29uZGl0aW9ucworICogYXJlIG1ldDoK 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