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.
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