| --- Log opened Wed Aug 18 00:00:37 2010 |
| 00:04 | | Vornicus-Latens is now known as Vornicus |
| 00:31 | | You're now known as TheWatcher[T-2] |
| 00:33 | | You're now known as TheWatcher[zZzZ] |
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| 06:34 | | * McMartin is a bad person |
| 06:34 | <@McMartin> | Someone observes that using char *** as he is clearly makes him a bad person |
| 06:34 | <@McMartin> | I suggest replacing it with the Obviously Cleaner (tm) std::map<std::pair<int, int>, std::string> |
| 06:36 | < Vornicus> | ;_; |
| 06:36 | < Vornicus> | Eh. Three stars isn't all that bad. |
| 06:37 | <@McMartin> | The problem with it is that three months later, which it now is, it's hard to tell between a std::map<std::pair<int, int>, std::string> and a std::vector<std::string>&. |
| 06:37 | <@McMartin> | Also, anyone who bitches about Java for being verbose? Punch them in the goddamned teeth~ |
| 06:37 | < Vornicus> | Java at least isn't ambiguous about that kind of shit. |
| 06:40 | < Vornicus> | Someone on here Who Shall Not Be Named once wrote a 6-star thing. For no good reason. |
| 06:41 | < Vornicus> | (he was doing a thing thatfigured out point values for D&D pointbuy. I pointed out that you could get the same thing from a pair of lists.) |
| 06:42 | < Tarinaky> | I'm currently trying to work our how to randomly generate the colour of a star. |
| 06:42 | < Vornicus> | Tarinaky: Main sequence, or would you like the exotics in there too? |
| 06:43 | < Tarinaky> | Specifically I need to generate a colour on the line Red-Yellow-White-Blue + a dimness. |
| 06:43 | < Tarinaky> | Although the thought occurs - Galaxies are all kinds of colours aren't they? |
| 06:44 | < Vornicus> | Galaxies are colored by their stars and their dust. |
| 06:46 | < Vornicus> | http://en.wikipedia.org/wiki/Black_body <--- you're gonna want this |
| 06:46 | < Tarinaky> | I'd rather not pregenerate a list of Class-Magnitude pairs. |
| 06:47 | < Rhamphoryncus> | Wait, using C/C++ to calculate point buy? |
| 06:48 | < Tarinaky> | Rhamphoryncus: I suspect it was part of a larger project. |
| 06:48 | < Vornicus> | It was statistical analysis of the entire gamut. |
| 06:48 | < Vornicus> | It was Unwise. |
| 06:48 | < Rhamphoryncus> | huh |
| 06:48 | < Tarinaky> | Vornicus: I'm... I'm not really sure how to apply that to the problem. |
| 06:48 | < Rhamphoryncus> | Was this something that needed to run more than once? |
| 06:49 | < Vornicus> | What he did was built a giant 6-dimensional array and then collapsed it. |
| 06:49 | < Vornicus> | Rham: no, thank god. |
| 06:49 | < Rhamphoryncus> | All the more reason to not use C x_x |
| 06:49 | < Rhamphoryncus> | I'm somewhat curious what the exact problem was, so that I might consider how I would solve it |
| 06:51 | < Vornicus> | 3.5e pointbuy vs dice: how likely is each possible outcome of 4d6 drop lowest 6 times, when converted to points? |
| 06:52 | < Vornicus> | (for the record: in 3.5e, the mean is about 30 points -- higher than the "elite array" of 25) |
| 06:53 | < Vornicus> | (I haven't run the numbers in 4e, but the book says that the standard pointbuy is better than your typical roll.) |
| 06:54 | < Tarinaky> | Vornicus: How would I go about generating a point on the curve? |
| 06:56 | < Vornicus> | Tarinaky: there's http://en.wikipedia.org/wiki/Planckian_locus <--- that tells you the color you get off a temperature. Note that it gives you some awesomely ridiculous values. |
| 06:57 | < Tarinaky> | Awesomely ridiculous? |
| 06:57 | < Vornicus> | http://en.wikipedia.org/wiki/Black_body <--- or, you can use this image and index into it. Much easier. |
| 06:58 | < Tarinaky> | Index it? |
| 06:58 | < Vornicus> | erp. |
| 06:58 | < Vornicus> | http://en.wikipedia.org/wiki/File:Blackbody-colours-vertical.svg <--- this image. |
| 07:00 | < Tarinaky> | But I need RGB values. |
| 07:01 | < Vornicus> | Then turn the svg into a damn png and index into it. That gives you your color. |
| 07:02 | < Vornicus> | Then just do some stuff with your apparent magnitude and you'll have yourself a party. |
| 07:03 | < Tarinaky> | Wait, you can do that? |
| 07:04 | < Vornicus> | Yes? |
| 07:04 | < Tarinaky> | Isn't it slow to do that with the SDL functions? |
| 07:04 | < Tarinaky> | Accessing surfaces directly. |
| 07:04 | < Vornicus> | Are you building entire stars, or just pixels. |
| 07:04 | < Tarinaky> | 2x2 dots. |
| 07:04 | < Vornicus> | Then it'll be easy. You do your color math first and then just throw a color at a blit function and you're all good. |
| 07:05 | < Tarinaky> | How do I dim the colour? |
| 07:08 | < Vornicus> | ...multiply each component by something less than 1? |
| 07:09 | < Tarinaky> | Oh. I thought that didn't work. |
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| 07:10 | | mode/#code [+o Kazriko] by Reiver |
| 07:11 | < Vornicus> | Multiplying color values by something works fine - you have to be vaguely careful with gamma, but not that careful. Adding color values can give you weirdness though. |
| 07:19 | < Rhamphoryncus> | Vornicus: wait, they brute forced the average point buy? Oi, it's much simpler than that |
| 07:20 | < Vornicus> | Rham: well, I did want to see the whole curve. I got mine done in five minutes and then it ran for five more. |
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| 07:20 | < Rhamphoryncus> | What curve? |
| 07:21 | < Vornicus> | The whole probability curve; how likely is it that 4d6 droplow gives you x points? |
| 07:21 | < Rhamphoryncus> | ahh |
| 07:21 | < Namegduf> | I hate 237 line functions. |
| 07:21 | < Rhamphoryncus> | 5 minutes sounds decent |
| 07:22 | < Vornicus> | This was written in relatively naive python and ran on a computer that was new 8 years ago. |
| 07:23 | < Rhamphoryncus> | my tools of choice (in python) are itertools.product, sorted, slicing, and sum |
| 07:23 | < Rhamphoryncus> | With a little lookup table and the appropriate logic |
| 07:24 | < Vornicus> | I used a 6-deep for loop because it was the first thing I thought of. And a pair of lookup tables. |
| 07:25 | < Rhamphoryncus> | yeah, itertools.product is most of that deep loop |
| 07:27 | < Namegduf> | Ah. |
| 07:28 | < Rhamphoryncus> | hopefully not buggy: http://pastebin.starforge.co.uk/337 |
| 07:30 | < Rhamphoryncus> | Oh, but I did cheat by copying the lookup table out of my existing pointbuy program |
| 07:31 | < Vornicus> | Missing something: the probabilities of each outcome. |
| 07:32 | < Rhamphoryncus> | yeah |
| 07:32 | < Rhamphoryncus> | It gives parts, not percents, and it's not cumulative |
| 07:32 | < Tarinaky> | So... |
| 07:33 | < Tarinaky> | tuple([prng.random()*a for a in Colour[prng.choice(Colour)] ]) << Would be right? |
| 07:33 | < Tarinaky> | Or does it only evaluate random() once? |
| 07:33 | < Rhamphoryncus> | evaluates each time |
| 07:33 | < Tarinaky> | Whoops. just realised |
| 07:33 | < Rhamphoryncus> | You can simplify that by using a genexp instead of a listcomp. The () from the function call double as the genexp's delimiters, so just remove the [] |
| 07:34 | < Tarinaky> | tuple([prng.random()*a for a in prng.choice(Colour) ]) << Would be right? |
| 07:34 | < Rhamphoryncus> | Looks better. What's Colour? |
| 07:34 | < Tarinaky> | A list. |
| 07:34 | < Tarinaky> | Colour is a list of tuples. |
| 07:34 | < Rhamphoryncus> | Rename it to Colours |
| 07:35 | < Rhamphoryncus> | a would be a tuple, which you can't multiply by a float |
| 07:35 | < Rhamphoryncus> | You might want ...for a, b in... |
| 07:35 | < Tarinaky> | Doesn't choice return a tuple? |
| 07:35 | < Vornicus> | Rhamphoryncus: no, he's... |
| 07:35 | < Tarinaky> | In this context. |
| 07:35 | < Vornicus> | choice picks one of the many colors, so he's geting one tuple off that bit there. |
| 07:36 | < Rhamphoryncus> | err |
| 07:36 | < Vornicus> | tuple(prng.random()*a for a in prng.choice(Colours)) |
| 07:36 | < Rhamphoryncus> | Yeah, I'm silly x_x |
| 07:36 | < Vornicus> | Should work. |
| 07:36 | < Vornicus> | Turns it into a genexp instead of a list so it comes out a little more nicely in some ways. |
| 07:38 | < Tarinaky> | So if I generate a surface using the pixel draw functions... Can I then change its pallet? |
| 07:39 | < Tarinaky> | *palette |
| 07:39 | < Vornicus> | Whyyyyy are you doing that |
| 07:40 | < Tarinaky> | To set the colour? |
| 07:40 | < Vornicus> | Set the color before drawing the pixels, maybe? |
| 07:40 | < Tarinaky> | That'd require me to redraw the shape every time I needed it though. |
| 07:41 | < Tarinaky> | Which is expensive. |
| 07:41 | < Vornicus> | What? |
| 07:42 | < Tarinaky> | The star is, at present, drawn at program launch and then just pulled from a variable as it's needed. |
| 07:42 | < Vornicus> | It's just 2x2 pixels, right |
| 07:43 | < Tarinaky> | It's a -very- frequently called function though. |
| 07:44 | < Vornicus> | Are you calling it 5,000 times a frame? |
| 07:45 | < Vornicus> | Hell, are you even calling it 100 times a frame? |
| 07:45 | < Tarinaky> | ...No. |
| 07:45 | < Tarinaky> | Well, with 1 exception. |
| 07:46 | < Vornicus> | Then you don't get to complain about call frequency. |
| 07:47 | < Tarinaky> | k -.- |
| 07:48 | < Tarinaky> | ... I just got a green star. |
| 07:49 | < Tarinaky> | ... Why am I getting green and purple stars when those colours aren't in the list? |
| 07:49 | < Tarinaky> | >.< |
| 07:57 | < Vornicus> | Idunno. Print your star color before and after extraction. |
| 07:59 | < Tarinaky> | (255, 122, 0) |
| 07:59 | < Tarinaky> | (34.171483697384389, 103.68587698224911, 0.0) |
| 07:59 | < Tarinaky> | Oh wait. |
| 08:00 | < Tarinaky> | Derp. |
| 08:00 | < Tarinaky> | I know what I've done. |
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| 08:01 | < Vornicus> | Well there's your problem. |
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| 08:05 | | Netsplit *.net <-> *.split quits: cpux |
| 08:05 | < Tarinaky> | http://deathcookie.fizkerinc.dk/download/file.php?id=18 |
| 08:06 | < Vornicus> | Beautiful. You'll want a higher bias though - more blues and whites. |
| 08:06 | < Tarinaky> | I can draw a stary background. Welcome to 1993. |
| 08:08 | < Tarinaky> | Not too sure how to do that. |
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| 08:11 | < Vornicus> | What's your color source look like - a tuple of colors, in order from red to blue? Or something in that sense? |
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| 08:11 | | mode/#code [+o ToxicFrog] by Reiver |
| 08:11 | < Vornicus> | You could random up to the square of the number of colors and then square root it and floor it. |
| 08:14 | < Tarinaky> | What gets the length of a list? |
| 08:15 | < Vornicus> | len(seq) |
| 08:17 | < Tarinaky> | It's complaining that floor is returning a float. |
| 08:17 | < Vornicus> | replace math.floor with int |
| 08:19 | < Tarinaky> | http://i37.tinypic.com/oiwqjl.png |
| 08:20 | < Vornicus> | Better. |
| 08:22 | < Vornicus> | Indeed, that's quite nice. |
| 08:31 | < Tarinaky> | Hmm. |
| 08:31 | < Tarinaky> | k = Colours[int(math.sqrt(prng.randint(0,(len(Colours))**2 ) ) ) ] |
| 08:31 | < Tarinaky> | IndexError: list index out of range |
| 08:31 | < Tarinaky> | Oh, duh. randint is inclusive. |
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| 08:38 | | * McMartin redoes FotH's default messages. |
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| 11:49 | < Tarinaky> | So. If I have a triangle: [(0,0),(0.5,1),(1,0)] how do I translate those points when I rotate it about point (0.5,0.5)? |
| 11:52 | < Tarinaky> | I know I'm dealing with a unit circle which means 1=y**2+x**2 |
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| 13:24 | | * thalass grars |
| 13:26 | < thalass> | I'm trying to ./configure a package called gpsviewer, and it requires 'chamlain-gtk-0.3' and/or 'champlain-0.3'. I have 0.4 of both, (or, rather, 'libchamplain-0.4') and it refuses to acknowledge it. I can't find where to get the older version (though i'm looking now) |
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| 13:52 | <@ToxicFrog> | thalass: install the -devel version. |
| 13:52 | <@ToxicFrog> | generally, "libfoo" \ |
| 13:53 | <@ToxicFrog> | is just the library binaries, needed to run programs that use that library. |
| 13:53 | <@ToxicFrog> | "libfoo-dev" or "libfoo-devel" is the headers and documentation, needed to compile programs that use that library. |
| 14:01 | < thalass> | I do have the -0.4-dev versions, actually. I remembered that from the last time i had trouble :P |
| 14:03 | < thalass> | ah another look at the ./configure error output. It says the package requirement is 'champlain-gtk-0.3 >= 0.3.3' - and the same for champlain-0.3. odd that they would put an upper limit on the version |
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| 14:32 | < thalass> | haha. helps if you look up the project's website itself. *downloads* |
| 14:34 | < thalass> | gods. there are even more requirements to compile libchamplain-0.3.3, which i need to compile another program. it never ends! hah |
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| 14:54 | <@ToxicFrog> | Er |
| 14:54 | <@ToxicFrog> | >= 0.3.3 is a lower bound on the version |
| 14:54 | <@ToxicFrog> | "0.3.3 or later" |
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| 17:16 | < RichardBarrell> | Pity thalass left, or we could prod them to check whether their distro's repositories included a "libchamplain-dev" package. |
| 17:35 | <@ToxicFrog> | <thalass> I do have the -0.4-dev versions, actually. I remembered that from the last time i had trouble :P |
| 17:38 | < RichardBarrell> | Oh. |
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| 22:42 | < Tarinaky> | 'sup? |
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| --- Log closed Thu Aug 19 00:00:38 2010 |