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Implement horizontal-alignment for line placements.

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This commit is contained in:
Hermann Kraus 2013-04-29 01:42:11 +02:00
parent 54c7e64bc9
commit 2320632f87
4 changed files with 36 additions and 4 deletions
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1
include/mapnik/vertex_cache.hpp
View file

@ -103,6 +103,7 @@ public:
pixel_position const& current_position() const { return current_position_; }
double angle(double width=0.);
double linear_position() const { return position_; }
/** Returns a parallel line in the specified distance. */

17
src/text/placement_finder.cpp
View file

@ -300,12 +300,21 @@ bool placement_finder::find_line_placements(T & path, bool points)
double spacing = get_spacing(pp.length(), points ? 0. : layout_.width());
// first label should be placed at half the spacing
pp.forward(spacing/2);
horizontal_alignment_e halign = info_->properties.halign;
if (halign == H_LEFT)
{
//Don't move
} else if (halign == H_MIDDLE || halign == H_AUTO)
{
pp.forward(spacing/2);
} else if (halign == H_RIGHT)
{
pp.forward(pp.length());
}
path_move_dx(pp);
do
{
tolerance_iterator tolerance_offset(info_->properties.label_position_tolerance * scale_factor_, spacing);
tolerance_iterator tolerance_offset(info_->properties.label_position_tolerance * scale_factor_, spacing); //TODO: Handle halign
while (tolerance_offset.next())
{
vertex_cache::scoped_state state(pp);
@ -369,7 +378,7 @@ bool placement_finder::single_line_placement(vertex_cache &pp, text_upright_e or
vertex_cache &off_pp = pp.get_offseted(offset, sign*layout_.width());
vertex_cache::scoped_state off_state(off_pp); //TODO: Remove this when a clean implementation in vertex_cache::get_offseted was done
if (!off_pp.move(sign * jalign_offset((*line_itr)->width()))) return false;
if (!off_pp.move(sign * jalign_offset((*line_itr)->width())-alignment_offset().x)) return false;
double last_cluster_angle = 999;
signed current_cluster = -1;

21
tests/visual_tests/styles/text-halign.xml Normal file
View file

@ -0,0 +1,21 @@
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map>
<!-- Upright test -->
<Map background-color="white" srs="+proj=latlong +datum=WGS84">
<Layer name="layer" srs="+proj=latlong +datum=WGS84">
<StyleName>My Style</StyleName>
<Datasource>
<Parameter name="type">osm</Parameter>
<Parameter name="file">../data/lines2.osm</Parameter>
</Datasource>
</Layer>
<Style name="My Style">
<Rule>
<LineSymbolizer stroke-width="12" stroke="red"/>
<TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="line" upright="auto" max-char-angle-delta="0" horizontal-alignment="left" label-position-tolerance="0.0001">"horizontal-alignment=left"</TextSymbolizer>
</Rule>
</Style>
</Map>

1
tests/visual_tests/test.py
View file

@ -80,6 +80,7 @@ text_tests = [
{'name': "text-bug1820+0", 'sizes':[(600, 300)], 'bbox':default_text_box},
{'name': "text-bug1820+1", 'sizes':[(600, 300)], 'bbox':default_text_box},
{'name': "text-expressionformat-color", 'sizes':[(800, 100)], 'bbox':default_text_box},
{'name': "text-halign", 'sizes': [(800,800)], 'bbox':default_text_box},
# Disabled by default as the required font isn't shipped with mapnik
#{'name': "text-malayalam", 'sizes':[(800, 100)], 'bbox':default_text_box},
]