| --- Log opened Wed Jul 01 00:00:26 2009 |
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| 09:25 | | You're now known as TheWatcher |
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| 12:07 | | * TheWatcher makes a note to talk with Dera about mercurial when he awakes |
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| 15:55 | <@gnolam> | Finally. I got mic capture working. |
| 15:59 | <@gnolam> | Now I just have to figure out why I'm getting tons of noise when I'm touching the probe. |
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| 16:43 | <@gnolam> | Hmm. Sounds like a ground loop, now that I think about it... but that's odd. |
| 16:47 | <@Consul> | Ground loop? |
| 16:49 | <@gnolam> | Score! Disconnecting the laptop from mains power solved it. |
| 16:51 | <@Consul> | You were getting a ground loop on your laptop? |
| 16:52 | <@gnolam> | Apparently. |
| 16:52 | <@Consul> | That IS kinda weird. |
| 16:53 | <@Consul> | Does your mains power have a proper ground? |
| 16:53 | <@gnolam> | Well, it is sort of a Frankenstein setup I've got going here... |
| 16:53 | <@gnolam> | Proper ground? In this apartment? Hah! :D |
| 16:54 | <@Consul> | Heh |
| 16:54 | <@gnolam> | I used to get electric shocks if I touched the computer case and the radiatior at the same time. |
| 16:54 | <@Consul> | We don't have proper grounding in our 120-year-old house here, either. |
| 16:55 | <@Consul> | I'm setting up my studio in the basement, where fortunately I can run a grounding bar from the cold water pipe. |
| 16:56 | <@gnolam> | That would be illegal here. But then again, so is probably most of the construction work that went into this place... |
| 16:58 | <@Consul> | It's probably against code here as well. |
| 16:58 | <@Consul> | I won't do that unless I actually have to, though. |
| 17:00 | <@Consul> | Although in the States, common ground for the house usually ties to the cold water pipe. |
| 17:00 | <@gnolam> | Anyway. It works now, and I'll be running on battery power tomorrow anyway. |
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| 17:19 | <@gnolam> | http://www.lysator.liu.se/~gnolam/temp/weak_beta_crackle.wav <- see, now this is how a radiac meter /should/ sound. |
| 17:20 | <@Vornicus> | Yay geiger counters |
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| 18:13 | | * Derakon digs through the Jetblade code, looking for places he used 0, 1, or 2 and replacing them with invocations of constants. |
| 18:16 | <@Vornicus> | Why are you constantizing itty numbers? |
| 18:16 | < Derakon> | Because the 0, 1, and 2 had meanings that were not 0, 1, or 2. |
| 18:16 | < Derakon> | 0 meant "empty space", 1 meant "uninitialized space", and 2 meant "wall". |
| 18:17 | < Derakon> | So I'm replacing them with BLOCK_EMPTY, BLOCK_UNALLOCATED, and BLOCK_WALL, which themselves are 0, 1, and 2. |
| 18:18 | <@Vornicus> | aha, that is wise. |
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| 18:21 | <@TheWatcher> | ... yeah, this was why I could never handle python for too long |
| 18:22 | < Derakon> | Whitespace getting to you? |
| 18:22 | <@TheWatcher> | Not so much that, the lack of braces |
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| 18:24 | <@TheWatcher> | Huge cognitive dissonance as I try to persuade my headbones that yes, that function/etc is closed. ¬¬ |
| 18:25 | < Derakon> | Heh. |
| 18:31 | | * Derakon gets an error on line 1234 of map.py. ¬.¬ |
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| 19:34 | < Derakon> | There, that's two to-dos knocked off. |
| 19:35 | < Derakon> | And 15 remaining. ¬.¬ |
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| 20:28 | | * Derakon tries to figure out how to detect concave polygons. |
| 20:28 | < Derakon> | Wikipedia says that concave polygons have interior angles greater than 180°. |
| 20:28 | < Derakon> | I can use the law of cosines to find interior angles, but they're of course always clamped to [0, 180]. |
| 20:29 | < Derakon> | I could draw lines from each point in the polygon to each other point and see if their midpoints are in the polygon, but that would require writing a point-is-in-polygon test and is brute-force to boot. |
| 20:31 | <@McMartin> | They can, idly; see the chevron logo. |
| 20:31 | <@McMartin> | There's an algorithm for this involving odd vs. even numbers of intersections, I think. |
| 20:32 | < Derakon> | That would involve rasterizing the polygon, wouldn't it? |
| 20:32 | < Derakon> | And I'm not certain what your point is about the chevron logo? |
| 20:34 | <@McMartin> | It has an internal angle (top center vertex) greater than 180 degrees. |
| 20:35 | < Derakon> | And it's concave. |
| 20:35 | <@McMartin> | Yeah, just saying wiki is actually right~ |
| 20:36 | < Derakon> | Oh, sure. |
| 20:36 | < Derakon> | I'm just complaining because the law of cosines only gives angles in the range [0, 180] because it only looks at two edges at a time. |
| 20:36 | <@Vornicus> | Der: the correct way is not LoC but to use cross product. |
| 20:36 | < Derakon> | ...duh! |
| 20:36 | < Derakon> | Thanks, Vorn. |
| 20:37 | <@Vornicus> | (a - b) x (b - c) should have the same sign all the way around. |
| 20:37 | < Derakon> | Right. |
| 20:43 | <@Vornicus> | You may in addition wish to enforce a particular winding direction, which can make your life easier in some ways. |
| 20:43 | < Derakon> | That should be easy enough to autodetect. |
| 20:44 | < Derakon> | But, uh, I'm getting bogus results here... |
| 20:44 | < Derakon> | Given sequential points p1, p2, and p3 in a polygon (with p2 between p1 and p3)... |
| 20:44 | < Derakon> | a = (p2[0] - p1[0], p2[1] - p1[1]) |
| 20:44 | < Derakon> | b = (p3[0] - p2[0], p3[1] - p2[1]) |
| 20:44 | < Derakon> | angleDirection = cmp(a[0] * b[1] + a[1] * b[0], 0) |
| 20:45 | < Derakon> | That's getting incorrect values. |
| 20:45 | < Derakon> | DEBUG: Angle formed by (14, 64) (14, 14) (64, 14) is in 1 direction from (0, -50 |
| 20:45 | < Derakon> | ) (-50, 0) |
| 20:45 | < Derakon> | DEBUG: Angle formed by (14, 14) (64, 14) (64, 64) is in -1 direction from (50, 0 |
| 20:45 | < Derakon> | ) (0, -50) |
| 20:46 | <@Vornicus> | Isn't it a.x * b.y - a.y * b.x |
| 20:46 | < Derakon> | ...thank you. |
| 20:46 | < Derakon> | Right, that got it. |
| 20:47 | < Derakon> | Correctly identified the bogus concave polygon I made. |
| 20:49 | < Derakon> | Another to-do down. |
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| 20:51 | <@Myst> | McMartin! |
| 20:51 | < Derakon> | Is, I believe, in a meeting. |
| 20:51 | <@Myst> | Cartesian Product got it, thank ye very much! |
| 21:07 | | * Vornicus wonders what the cartesian product was for. |
| 21:07 | | * McMartin returns from meatings |
| 21:07 | <@McMartin> | Hooray for them working! |
| 21:14 | <@Myst> | Vorn: http://southernmyst.livejournal.com/152411.html |
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| 21:18 | <@Vornicus> | ah. yes, cartesian product. |
| 21:19 | <@McMartin> | I don't actually know how you do those in Mathematica though. |
| 21:19 | <@Myst> | CartesianProduct[l1,l2] but you have to load the Combinatorica package first |
| 21:19 | <@Myst> | << Combinatorica` |
| 21:20 | <@Myst> | At least that's how it works in my copy of 6 ;-) |
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| 21:22 | | * TheWatcher bleghs at this code |
| 21:24 | <@TheWatcher> | Feels weird having the function documentation in the header, not in the source file. |
| 21:25 | <@McMartin> | Heh |
| 21:25 | <@McMartin> | "You just can't handle my wild stylings!" |
| 21:26 | <@TheWatcher> | Hey, McM? Do you know if cstdio's snprintf() can have a std::string as its buffer argument? |
| 21:29 | <@gnolam> | No. c_str() is const. |
| 21:30 | <@McMartin> | gnolam calls it. |
| 21:30 | <@McMartin> | consider using a stringstream, though I forget the precise class offhand. |
| 21:30 | <@TheWatcher> | I have considered it. |
| 21:30 | <@McMartin> | c_str is *not* the backing store; std::string does not guarantee its contents are in continguous RAM. |
| 21:33 | <@TheWatcher> | Yeah, which is worrying me somewhat from an efficiency point of view, but hey |
| 21:34 | <@McMartin> | Depends on what's being made efficient. |
| 21:34 | <@McMartin> | It makes creation from substrings more efficient, not to mention prepending if it's a deque of char. |
| 21:35 | <@TheWatcher> | I need to be able to do string comparison quickly |
| 21:37 | <@TheWatcher> | My suspicion is that string is going to be rather less suitable for this than old fashioned blocks of char, but I'm trying to give it a chance. |
| 21:39 | <@McMartin> | string is acceptable for this and has so many other advantages it's almost certainly worth it |
| 21:39 | <@McMartin> | Just remember to past const references in most cases. |
| 21:40 | | * Derakon is reminded of a signature on the GameDev.net forums: "As a general rule, if you post in For Beginners and your code contains the word 'char', you have a bug. std::string roxors teh big one one one one." |
| 22:11 | | * gnolam blarghs at the Radiation Safety Authority. |
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| 22:14 | <@gnolam> | They don't quite seem to get the limitations of implementing all of this in a commercial computer game. :P |
| 22:32 | | * TheWatcher constructs a test class to try all this stuff out using exclusively string, ostringstream and iomanip stuff, knows it'll work now at least |
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| 23:26 | | * TheWatcher ponders 'Resource * const res' |
| 23:27 | <@TheWatcher> | They really could have come up with a nicer syntax for that, seriously |
| 23:27 | <@McMartin> | One of C++'s design goals was a few keywords as possible. >_< |
| 23:28 | <@Vornicus> | fewer keywords is in general good! However there is a limit. |
| 23:29 | <@McMartin> | Part of this is "every time we add a new reserved word, millions of lines of C code can no longer be combined directly into C++ code" |
| 23:30 | <@McMartin> | C++ is finally starting to be independent enough that maybe can make this go away |
| 23:34 | <@Vornicus> | Python has 33 reserved words; SQL has something like 700. |
| 23:35 | | * UndeadAnno mumbles some more about when Power Designer let him use keywords for naming tables and attributes... it wrapped them in quotes and called it a day. |
| 23:36 | <@UndeadAnno> | I was not happy when I discovered this, as my Java persistence code - which ignored the quotes - did not work. |
| 23:46 | | You're now known as TheWatcher[T-2] |
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| --- Log closed Thu Jul 02 00:00:41 2009 |