On Tue, Jun 07, 2011 at 11:39:51AM +1200, Ralph Versteegen wrote: > On 7 June 2011 07:45, James Paige <b...@hamsterrepublic.com> wrote: > > On Mon, Jun 06, 2011 at 03:23:26PM -0400, Mike Willis wrote: > >> So I don't know how to reply on those archives, but here is the crux of > >> the parallax problem I think: > >> > >> You want the x coordinate of the top left of the screen to be the > >> dividing > >> factor, NOT the tiles. In other words, you don't want > >> (parallax 'map' final tile x-coord) == 1/3 * (real map final tile > >> x-coord) > > > > I haven't used tile coordinates for anything. pixel coordinates only. > > > >> You want > >> (parallax 'map' final pixel x-coord -- screen pixel size) == 1/3 * (real > >> map final pixel x-coord -- screen pixel size) > >> > >> Then the script would work as intended, I think...? > >> > >> Alternatively, you want to work out the actual ratio of sizes RATIO as > >> follows: > >> RATIO:= (parallax 'map' final pixel x-coord -- screen pixel size) / > >> (real > >> map final pixel x-coord -- screen pixel size) > >> > >> and then use this RATIO in your script instead of 1/3 > > This all looks correct. And to be honest it hadn't occurred to me that > the screen size matters (it applies only for one of the two types of > parallax layers). > > But if fact you don't really need to worry about correcting for the > size of the screen, you just need to draw a large enough corner of the > map layer (a bit more than a third).
Yeah, I realized I could just add 6 rows and 10 columns to my background layer to make this work the easy way, but I really wanted to figure out how to make it work when the background layer is exactly 1/3 the size of the map. > I imagine that the real reason that your script isn't working is that > the map root slice is placed at (-camera x, -camera y) relative to the > screen, so to get the map layer to display at (camera x/3, camera > y/3), you actually need to place it at offset (camera x * 2/3, camera > y * 2/3) relative to the map root. Yes, absolutely right. I actually should have posted the version of that script where I was doing: camera pixel x -- camera pixel x / 3 That is as close as I got to making it work right :) --- James _______________________________________________ Ohrrpgce mailing list ohrrpgce@lists.motherhamster.org http://lists.motherhamster.org/listinfo.cgi/ohrrpgce-motherhamster.org
