1. Modified Text Symbolizer
a) corrected line fragment centering (for 2nd and subsequent lines, when line breaks occur).
b) adjusted vertical alignment calculation so that:
i) middle -> has the center of the text line(s) at the point origin
ii) bottom -> has the text line(s) below the point origin
iii) top -> has the text line(s) above the point origin
c) added new text_symbolizer attribute: 'wrap_before', value range: true/false, default == false
allows line breaks at first wrap_char before wrap_width as an alternative to the original
which was to create the line break at the first wrap_char after wrap_width
d) added new text_symbolizer attribute: 'horizontal_alignment', value range: left/middle/right, default == middle
i) left -> has all text line(s) to left of the point origin
ii) middle -> has all text line(s) centered on the the point origin
iii) right -> has all text line(s) to the right of the point origin
NOTE: dx, dy position adjustments are applied after alignments and before Justify.
e) added new text_symbolizer attribute: 'justify_alignment', value range: left/middle/right, default == middle
i) left -> after alignments, has all text line(s) are left justified (left to right reading)
ii) middle -> after alignments, has all text line(s) center justified
iii) right -> after alignments, has all text line(s) right justified (right to left reading)
f) added new text_symbolizer attribute: 'opacity', value range: 0.0 thru 1.0; 1.0 == fully opaque
g) modified positioning to compensate for both line_spacing and character_spacing, to ensure proper
centering of the text envelope. Also ensure that centering occurs correctly even if no wrapping
occurs. Line spacing is uniform and consistent and compensates for errors between text_size and
the actual size (ci.height is inconsistent, depending on case and character); fixes issue with
multi-line text where some lines have a slight gap and others are compressed together.
2. Modified shield_symbolizer
a) added the attributes:
i) allow_overlap
ii) vertical_alignment
iii) horizontal_alignment
iv) justify_alignment
v) wrap_width
vi) wrap_character
vii) wrap_before
viii) text_convert
ix) line_spacing
x) character_spacing
xi) opacity
b) added new shield_symbolizer attribute: 'unlock_image', value range: true/false, default == false
i) false == image and text placement behaviour same as before
ii) true == image placement independant of text, image is always centered at geometry point, text placed per attributes,
dx/dy only affect text.
Allows user to create point markers with text, but both the text and image rendering collision detection are done
as a pair (they come and go together - solves problem if using point_symbolizer and text_symbolizers where one or the
other are omitted due to overlaps, but not both)
c) extended choices for the attribute 'placement' to include vertex; effect is limited to the shield_symbolizer
Allows an attempted placement at every vertex available, gives additional shield placement volume when using line geometry
d) ensured that the text placement was not updating the detector unless a shield image was actually placed.
e) added new shield_symbolizer attribute: 'no_text', value range: true/false, default = false
When set true, the text for the feature is ignored ('space' subsituted) so that pure graphic symbols can be used
and no text is rendered over top of them.
* text_convert="none|toupper|tolower"
Convert all text to upper/lower case before rendering. "none" doesn't do
anything with the text and is the default. Works for labels along lines
or at points.
* line_spacing="<number>"
Add this many pixels space between two lines in text labels that have
been broken into several lines. Default is 0. Doesn't do anything for
labels along lines.
* character_spacing="<number>"
Add this many pixels space between two characters in a text. Default is 0.
Currently only works for text labels on point geometries. This should
also be implemented for labels along lines, but I'll leave that for
another day.
* wrap_character="<character>"
Instead of breaking text into lines on spaces, use this character. This
is useful, when you want to make sure that labels are broken at the right
spot. Note that you'll probably want to make wrap_width small so that
your lines are actually broken, otherwise you'll see the wrap_character
in the output. Default is ' ' (space). Doesn't do anything for labels
along lines.
Add new find_point_placements to cover the gap left.
Change shield symbolizer to use find_point_placements.
Results are the same as before, but with much less duplicate code.
Slightly changes the result of max_char_angle_delta as now character angles aren't strict against the line angles.
Example screenshots on mailing list! :)
Spacing and no spacing line rendering are done by the same function.
Code is cleaner, performance should be equal or improved.
Text displacement is "Different", better in some cases and worse in others, I can revert it if wanted.
Old non spacing code is not yet removed as it is used by ShieldSymbolizer which I haven't investigated yet.
Individual character placement still has issues, that is my next task to fix!
2. PostGIS plug-in - optional 'multiple_geometries' parameter to control how Multi* geometries built.
3. MarkersSymbolizer (work in progress) to render vector shapes (markers) alonh a path with collision detection.
- libxml2 support
- strict error handling while parsing XML map files
- implemented save_map()
- removed some duplicate defaults
- all symbolizers with icons share a common base class now
(FIXME : label_spacing is still, too slow!!)
2. Re-use some agg objects.
3. placement_finder cleanups!
4. Added support for 'building_symbolizer' - extruded polygons
Shield symbolizer is now a subclass of text symbolizer.
Some small improvements to text rendering.
Fixed up placement finder for horizontal placement.
Cleaned up placement finder.
fixed 'for' loops to work correctly when geom->num_points() < 2
always use prefix increment even for built-in types (good practice!)
e.g ++i
2. agg_renderer.cpp
check for number points in geometries when
applying text/shield_symbolizer.
angle changes too much between characters it finds an alternate
placement), this is specified in the max_char_angle_delta property in
radians (feel free to change it to degrees).
It also improves the text placement around corners trying to minimise
the distance between the center of the character and the line on each
side. This is the major portion of the patch.
