Hello again, I was asking a while ago about placing text on a plot at positions specified in "graph coordinates". The example I gave wasn't very useful. My novice tacit expressions are probably more complex than they need to be, and I didn't give you any sample data. Sorry. I was a bit too lost in my own problems to see the obvious simplification, identical in all important respects, which is as follows.
Consider the following simple plot: X =. 0 1 2 3 Y =. 3 2 1 0 pd 'reset' pd 'type dot' pd X;Y pd 'show' Given a list of boxed strings T with the same number of elements as X and Y: T =. 'label1';'label2';'label3';'label4' I would like to draw those strings on the plot at the coordinates given by X and Y, such that they label the dots that the above snippet plots. Is this possible? I looked into getting the plot geometry from the locale variables Gx etc, but I think these are only assigned when "pd 'show'" is given. I've worked out I can get one character towards what I am after by using the "symbol" plot type, but I'd rather have a string located relative to the point in question, as a label rather than a marker. Thanks for any help, Hamish On Fri, Dec 5, 2008 at 22:59, Hamish Harvey <[email protected]> wrote: > Thanks Björn, but I'm afraid I don't follow. Sorry if I'm missing > something obvious. > > What I have is this: > > data =. ((1.5e8 * i. 5) ; 0 8 12 14 14) ,: (1.6e8 * i. 5) ; 0 9 14 16 16 > coords =. (>./&>@:{.@:] , >./&>@:{:@:])"1 data > labels =. 'label 1'; 'label 2' > pd 'reset' > pd"1 data > pd"1 (<. 1000 * 7e8 18 %~"(1) 0.25e8 1 +"1 coords) ('text ', ":@:[ , ' > '&,@:>@:])"(1 0) labels > pd 'show' > > The "coords" line finds the end point of each line in "data". The > second from last line then constructs a string 'text x y label', > taking labels from "labels" and coords from "coords", but adjusting > the coordinates approximately to match the graph axis coordinate > system. The scale and offset I judged by eye. Is there any way I write > text directly in the axis coordinate system, or obtain the > transformation data from pd? > > Cheers, > Hamish > > On Fri, Dec 5, 2008 at 21:21, Björn Helgason <[email protected]> wrote: >> http://www.jsoftware.com/svn/base/tags/j602a/plot/base/main/test1.ijs >> >> 2008/12/5 Hamish Harvey <[email protected]> >> >>> Hello, >>> >>> I'm enjoying getting to grips with J. >>> >>> I've just got to plotting some results, and I wonder if it is possible >>> to draw text using pd at graph coordinates. The options seem to be in >>> pixel or [0,1000] coordinate systems, both of which cover the full >>> area of the window (or pdf bounding box). I want to label the end of >>> plot lines, though. >>> >>> If not, is there any way to obtain the transformation from plot area >>> coordinates to one of these other systems? >>> >>> As an example: I have a line on a plot that ends at, say, (1.3e7, 45), >>> and want to place a label close to the end of that line. >>> >>> Thanks, >>> Hamish >>> >>> -- >>> Hamish Harvey >>> Research Associate, School of Civil Engineering and Geosciences, >>> Newcastle University >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >>> >> >> >> >> -- >> Björn Helgason, Verkfræðingur >> Fugl&Fiskur ehf, >> Þerneyjarsundi 23, Hraunborgum >> Po Box 127,801 Selfoss , >> t-póst: [email protected] >> gsm: +3546985532 >> Landslags og skrúðgarðagerð, gröfuþjónusta >> http://groups.google.com/group/J-Programming >> >> >> Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans >> >> góður kennari getur stigið á tær án þess að glansinn fari af skónum >> /|_ .-----------------------------------. >> ,' .\ / | Með léttri lund verður | >> ,--' _,' | Dagurinn í dag | >> / / | Enn betri en gærdagurinn | >> ( -. | `-----------------------------------' >> | ) | (\_ _/) >> (`-. '--.) (='.'=) >> `. )----' (")_(") >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > > -- > Hamish Harvey > Research Associate, School of Civil Engineering and Geosciences, > Newcastle University > -- Hamish Harvey Research Associate, School of Civil Engineering and Geosciences, Newcastle University ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
