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offset_converter: Don't filter out closing and moving segments

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This commit is contained in:
Jiri Drbalek 2018-01-25 13:28:47 +00:00
parent 2461058ecc
commit fb5ca1bb8e
2 changed files with 53 additions and 0 deletions
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8
include/mapnik/offset_converter.hpp
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@ -129,6 +129,14 @@ struct offset_converter
//break; // uncomment this to see all the curls
vertex2d const& u0 = vertices_[i];
// End or beginning of a line or ring must not be filtered out
// to not to join lines or rings together.
if (u0.cmd == SEG_CLOSE || u0.cmd == SEG_MOVETO)
{
break;
}
vertex2d const& u1 = vertices_[i+1];
double const dx = u0.x - cur_.x;
double const dy = u0.y - cur_.y;

45
test/unit/vertex_adapter/offset_converter.cpp
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@ -336,4 +336,49 @@ SECTION("s curve") {
}
}
SECTION("offsect converter does not skip SEG_MOVETO or SEG_CLOSE vertices") {
const double offset = 0.2;
fake_path path = {};
path.vertices_.emplace_back(-2, -2, mapnik::SEG_MOVETO);
path.vertices_.emplace_back( 2, -2, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 2, 2, mapnik::SEG_LINETO);
path.vertices_.emplace_back(-2, 2, mapnik::SEG_LINETO);
path.vertices_.emplace_back(-2, -1.9, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 0, 0, mapnik::SEG_CLOSE);
path.vertices_.emplace_back(-1.9, -1.9, mapnik::SEG_MOVETO);
path.vertices_.emplace_back( 1, -1, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 1, 1, mapnik::SEG_LINETO);
path.vertices_.emplace_back(-1, 1, mapnik::SEG_LINETO);
path.vertices_.emplace_back(-1, -1, mapnik::SEG_LINETO);
path.vertices_.emplace_back( 0, 0, mapnik::SEG_CLOSE);
path.rewind(0);
mapnik::offset_converter<fake_path> off_path(path);
off_path.set_offset(offset);
unsigned cmd;
double x, y;
unsigned move_to_count = 0;
unsigned close_count = 0;
while((cmd = off_path.vertex(&x, &y)) != mapnik::SEG_END)
{
switch (cmd)
{
case mapnik::SEG_MOVETO:
move_to_count++;
break;
case mapnik::SEG_CLOSE:
close_count++;
break;
}
}
CHECK(move_to_count == 2);
CHECK(close_count == 2);
}
}