CVS log for loncom/xml/lonplot.pm

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- Eliminate possibility of the same filename being used for different
  plots in a problem which includes multiple gnuplot tags so rendering
  for tex target will not use a later plot when rendering an earlier one.

- Localize warnings for invalid color attributes in web view
- Eliminate "deprecated color option" warnings in web server log files for
  distros using gnuplot 4.6
- Support colors for border, grid and background (4.6 and later) if printing
  and
- Warnings about invalid color attributes tailored to editing context.
- Prefix to six character hexcolors (x for 4.4 and older; # for 4.6 and newer)
  updated automatically in color pickers in "Edit" mode ("Save" still needed),
  in Authring Space.

- Modification to changes in 1.179 and 1.180 to support display of pi symbol
  to right of number in a gnuplot tic label with format: nP (n=integer) for
  both web and tex targets.

- Bug 6855
  Support background color, foreground color, and axis color with
  png terminal in gnuplot 5.0.

- Bug 6855
  - Support gnuplot 5.0

- Use same regexp for xformat and yformat.

- For a gnuplot tic label format of nP (n=integer), regexp will permit pi
  symbol (unicode: \0317\0200) to be shown to right of number.

- Include multiples of Pi in tic-mark label numerical format specifiers.

- Coding style (indent is 4 spaces).

reinstated gnuplot/@align=center (using a div in HTML and a center environment in LaTeX)

- For 2.10
  - gnuplot 4.4 reports an error unless "offset" is included before the x,y offset
    amount when used in "set xlabel" and"set ylabel".
    (see lonplot.pm rev. 1.169).

- Bug 6707. Add front or back option to GNUplot labels. (e.g., set label
  text to be in front of filled curve).

- Bug 6644
  - Reverse one change in rev. 1.157 (bug 6588).
  - Set linetype for ps output for solid curve to 1 instead of 0.

- defined(%hash) is deprecated, and results in errors on start-up for
  Apache 2.4/mod_perl 2.07/perl 5.16

- Bug 6641. Modify change in rev 1.170.
  - Set scope correctly for $plot_type inside "curves" loop.

- Modify change in rev. 1.162.
  - Helvetica font is only available when target is tex
    (get "gdImageStringFT: Could not find/open font" errors if target is web).

- Re-instate support for printing of multiple curves on a single plot,
  following changes (rev 1.156) to address bug 6588.
- Setting of $style_command delayed until after values have been retrieved
  for $pointtype and $pointsize.

- gnuplot 4.4 reports an error unless "offset" is included before the x,y offset
  amount when used in "set xlabel" and"set ylabel".

- Remove debug line (added in rev. 1.166).

- Support gnuplot 4.6 (used by SuSE 12.2).
  - color attributes in 4.6 begin with # instead of x.

bz838 - add spellchecking to <input type='text'> and <textarea>

 remembered to comment out the debugging output.

BZ5635 - Support rotate="yes|no"
for <xtics>/<ytics> tags to rotate tick labels as well.

BZ5635 - Provide complete control over axis major tics.

Factor out common code to generate tic specifications.

Accidently killed off the utf-8 output file specification :-(

Bug 4308 - Provide control over arrows in vector plots.
See http://bugs.loncapa.org/show_bug.cgi?id=4308 for details on what is now
available.

BZ 2886  - Fix utf-8 encoding in gnuplot.

Remove commented out code.

BZ6588 - First refactor and simplify the generation of gnuplot commands.
       - Second address the bug by associating a linestye with each plot
         and using that to select the plot attributes rather than cramming
         all the attributes into the plot command.
       - Finally, fix the fact that line style numbers differ between
         eps and png drivers so that now dashed lines work in eps output
         where I don't think they did before.

A pile of refactoring the gnu plot rendering prior to tackling
BZ 6588.

BZ874 Add fixups to colors for jpicker not inserting x's in color choosers

BZ 874 - Make color entries of class 'colorchooser'  this would allow some
javascript color choosr widget to be bound to them (e.g. jPicker).

Centralize knowledge of where the tmp directory is within LONCAPA.pm

adding functionality to display x and y axis zero lines as line, thick line, or dotted line

- Backport 1.151.

- Bug 5812. Typo.

- Backport 1.150.

- Correction to dereferencing (perl 5.10 is less forgiving).

POD comments added/altered

- bug 5780.
- block for minorfreq (for ytics) was in the wrong place following changes in rev 1.146.
   - missing linefeed caused gnuplot error.

All other function syntaxes (TeX, MAXIMA, CAPA-parser) use "^"

Unconditionally hard-wire the tic fonts for printing to Helvetica.
This is done since the DejaVu sans seems to have a problem with the
mius sign in tick labelling, while helvetica does not.

Debug all of the entities I intend to support at this time.

Misc. fixes to printing entities.

Fixed some incorrect chunks of the lookup table. Dealt with workarounds
for font limitations.. testing, testing each and every entity.

Got good run-time behavior (no server failures due to illformed regexps
in the lookup table).

Good load of complete entity table (Well the entity table in the HTML
pocket reference... still needs an exhaustive test of my typing.

Bunch more entities for lon plot... up into the math symbols now.

Added a pile more entitities.. finished the accented character set,
Latin extended A and Latin extended B..
and fleshed out the greek symbol set with some of the stranger ones.

Added a bunch more entities to the %lookup hash.
The added entities are not yet tested... but the table at least has the right
format.

Add more entities.

-  regexp substitution for $curve->{'color'} replaces x as first character in string.

adds dashed linetype capabilities, by adding linetype attribute to curves; also tweaks text descriptions for colorful editor

Phil's addition of a rotation option for plot labels.

- Hon-Kie generated list of entity to proper symbol lookup

- Phil Fazio fix to BUG#2137, add ability to control formatting of axes numbers

- backport 1.131

- do linewidth after any special attributes for some linestyles

- backport 1.130

- BUG#5423 - set default line width to 1

- backport 1.119's linewidth changes

- support gnuplot 4.2

- add in support of sup/sub and for the π entity in plot labels

- escape inadvertent attempt to access the enhanced label commands

- some more backward compatibility improvements for plots

- add in extra space between label and border if the tics are in the graph
- update font description stirng

- eliminate $pt have get_font return the correct size info for the selected target

- BUG#5342, reorder elments in edit mode

- BUG#5342 - from phil, forgot to pass back font size when in non classic mode

- BUG#5339, tex printing with classic mode needs no pfb file

- BUG#5234 give font face choices to plotting
- make capitalization of options the same

- reenable line width setting,
- add code for font point sizes, not actually working yet until ttf fonts are specified

- BUG#5288

- lonxml takes care of all insertions now, and thus the tags that were attempting to handle it themselves could cause double insertions so elimnate external insertion calls

- cleanup plot edit
  - no longer have the double horiz lines
  - images are aligned 'middle' not 'center'

- add ability to change grid lines to polar

- BUG#5000 IE is not likeing the 'send a png as data for a file ending in .gif' so make plot.png a link

&Apache::lonnet::unescape -> &unescape
&Apache::lonnet::escape -> &escape

- finish off the conversion to allowing style tags get_all_text across tags
- BUG#4428

- BUG#4191, that extra space was causing gnuplot images to not print

- adding more configurabilites to <gnuplot> (from Jim Maxka)

In 'tex' target prefix the plot with a tex comment that tells
outer tags that this is a dynamic image and what the size is.

Support registration of a callback by upper level tags to take tag dependent
action when a gnuplot image is created.  Note that callback nesting is not
supported at this time.

Export the %plot hash so that clients can figure out the image size e.g.

- ENV -> env

Added "plotcolor" attribute on the <gnuplot> tag.  Choices are "monochrome",
"color", and "colour".  Defaults to "monochrome".

Typo

Towards bug 3316: Tell gnuplot to output a png or gif as appropriate.
Omit font specification on labels for $target eq 'web'.

- bug #3458, allow variables for select style attributes

Added lmargin,rmargin,tmargin,bmargin, major_ticscale, and minor_ticscale
attributes to the <gnuplot> tag.  This change will not affect any currently
published plots.

Bug 3316: Gnuplot 4.0 does not handle empty data files well.
Modified write_gnuplot_file to look at each curve and only include it if it
has data or a function.

Ignore error messages on gnuplot version probing.

Bug 3123: Change wording on tic mark entry.

Changes for moving to gnuplot 4.0
lonplot.pm: detect gnuplot version on start and pass it to plot.gif
plot.gif: Send out correct content type (gif|png) if passed in.

Removed help text and routines in favor of using the insertlist.tab routines.

Typos: "separate"

Fixes bug 2523: Editing a plot which did not have a plottype attribute set
leads to the first item in the list (was "Polar", now is "Cartesian") being
selected.  This should go in 1.1.x.

- BUG#1974, <textarea>s delete the initial linefeeds if they exist, now checks old value and preserves the \n from the old value if it had been there.

Better TeX font support - allow users to specify the size of the font
used when the eps file is generated.  Ought to be case insensitive.

- backport lonplot.pm 1.91, lonxml.pm 1.281

- Can't do Apache::lonnet::ssi when &xmlparse()ing from inside the safe space, register the url and call it after we absolutely out of the safe space.

Far better to have tic marks on your graph than tick marks.  Ugh.

Bug 2201: Added support for minor tick marks.
Modified font code from Alex to only be used if we are printing.

Bug 2138 (Gnuplot: allow separate font size for print and screen) is fixed. I've implemented one particular font "Helvetica" with default size 25pt. If you want to change these defaults feel free to do this. You even can introduce some additional attributes to have possibility dinamically overwrite these parameters. Unfortunately I do not know sufficiently well lonplot.pm module so this can be done far better by Mattew.

Bug #16, polar plots.

- Ed want to use TeXwidth or texwidth

Putting <tag> in html output supresses the display the thing in "<",">"'s.
Who knew?

Bug 895 is fixed. Additional texwidth attribute is working now.

Size of gnuplot picture is changed to 93 mm according to Ed's desire.

Added 'texwidth' attribute.  The attribute is not implemented but can be
entered and has a default value.

- get_all_text() really wants to see the entire stack of parsers now, that way style redefinitons of tags can do a get_all_text across styl def boundaries.

- removing extraneous \fbox

Colors can be specified with lower and upper case letters.

Minor descriptive change to axes tag color parameter.

Bug 519.  Adds interface to gnuplot 'set samples' command for setting the
number of samples to use when gnuplot is given a function like 'sin(x)' to
plot instead of raw data.

Change to aspect ratio for printing.  +0.02 :)

Changed aspect ratio for printing.

Minor changes for printed output.

now prints gnuplot figs

Tex (eps) output now defaults to a line width of 2 on the curves.  Too bad the
gif driver does not support linewidth...

More changes and bugfixes for printing.

Bug fix, more changes for printing.

Filename change to help with printing.

minot cleanup for eps

Change to allow more characters in title, labels, and curve names.
Other minor formatting changes.

Minor change.
specify location of output file.

Changed some defaults and such.  Nothing big.

Added alttag tag to <gnuplot>

- changed textfield to the more descriptive editline
- updated all references to textfield to use edit line
- update <import> <scriptlib> <parserlib> to use the new editline
- editline, and editfield now protect entities, should preserve &nbsp; and " much better

Added pointtype specification, changed pointsize to positive real number,
fixed bug in which point sizes were not passed to gnuplot for curves which
used data instead of specifying a function.

Minor cleanup of insert functions to make the xml a little neater.

Now provide access to gnuplots 'pointsize' setting routines.  I tried to
add linewidth as well, but the gif driver does not support this option.

Use edit:textfield instead of edit:editfield for single-line data entry.

Changes to avoid double-interpolation of perl variables.

very very minor update to help text.

- the rand call was screwing up grade and answer mode parses BUG #190

Minor change to help text for plot, at the request of Ed Kashy.

escape and unescape filename passed between lonplot.pm and plot.gif

Changed tex rendering functionality to call plot.gif.  Must use plot.gif
version 1.8 or greater.

Now call gnuplot for $target eq 'tex'.

First stab at printing.  I don't guarantee printing works yet, but at least
$target eq 'web' will work.  Note: The only place information is returned
to the parser is in &end_gnuplot, for both 'web' and 'tex' targets.  For
$target eq 'tex' the name of the eps file is returned.  Currently this file
is not actually created, but that'll be fixed in the next commit.  Trust me.

Corrected idiot error - inserting plots will now actually have the correct tags.

No longer allow multiline title, xlabel, ylabel, or label texts (this broke
gnuplot anyway).

Added javascript to open help windows for editing hints.  Added some help
text for <gnuplot> and <curve> tags.

changed <plot> tag to <gnuplot>.

Minor bugfix for xtics & ytics, added &insert_tics() to insert both, and
cleaned up a bit of the code for insertion of tics.

Minor change of 'on_off' to 'onoff', for uniformity.
Added xtics and ytics tags and handling.

Minor changes to default inserted plot.

Ever so minor change to make key labels appear nicer.

Changes associated with reworking edit::modifiedfield().

minor changes on insertering and insert lists.

Correctly deal with perl arrays given as data.
Save data sets to files in order to allow gnuplot to deal with them properly.

Changes to use edit::start_spanning_row and edit::end_row instead of using
<dt colspan="3"> and other such nonsense.

Text entry width added for 'edit' tags.  Misc linestyle changes.

Added 'align' to plot attributes list and some minor text changes.

Check for number of elements in <data> set now works properly and complains.

Bugfix for reading in colors of curves, removed a few unusable linestyles,
added a few comments.

Edit updates, minor functionality added to edit_attributes.

sub BEGIN should be BEGIN

Replaced error checks on label text with line length test.  Added same test
to title, xlabel, and ylabel tags.

Added error checking to start_label to avoid hung httpd.

Insertion now works, as do targets 'modified', 'edit', and 'web'.

Multiple changes to enable target eq 'modified' and track down insert
errors

Removed axis{'linestyle'} data because it was unused.

More minor changes toward edit and modified.  Attempting to modify still
crashes

Minor edit changes, now seems to render correctly.

More $target eq 'edit' changes.

Minor cleanups.

Fixes for Perl 5.6 that probably fixed a bug I hadn't found earlier.

Further $target eq 'edit' handling code added.  Still untested and likely
broken.

Further $target eq 'edit' | 'modified' handling (still incomplete).
Some organizational changes in the code (mostly comments).

Added more metadata for the tags, began adding 'edit' and 'modified' handling.

Added error checking on data inputs, removed useless warnings, unused "use"es.

Removed regular expression that checked form of $datatext in &start_data.

Reworked functions to have all computation skipped if we're not doing a
'web' target.  Debugging code thrown in as well.

Allow <data> to contain space deliminated numbers as well as ',' deliminated.

*** empty log message ***

cleanups and warnings on bad input.

Now should handle missing information relatively cleanly.  I hope.

filename changes mostly.

Many debugging fixes.  Basic functionality now present.  At this stage the
plot.gif routine needs to be worked on.

Numerous debuggin changes.  Currently set to print out the gnuplot file
instead of saving it to disk.

Many misc. cleanups and revisions.  More needs to be done.  Data structures
in write_gnuplot_file are the base - the other appearances of global variables
must be changed to match those in the function.

Corrected misspelling.

Misc changes.

Basic functionality to write gnuplot input file added.  Have yet to even
check to see if the code will crash the server on startup.

Added words_test to check on the title of a key.

More misc changes.

Minor cleanups, nothing special.

Many changes too numerous and varied to list.

Routine to parse <plot> tag.