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[buffer] side_straight strategy, promote type

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Barend Gehrels
2014-07-20 16:52:26 +02:00
parent 77b2723935
commit 2cd7615435
1 changed files with 11 additions and 5 deletions
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16
include/boost/geometry/strategies/cartesian/buffer_side_straight.hpp
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@@ -14,6 +14,7 @@
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/util/math.hpp>
#include <boost/geometry/util/select_most_precise.hpp>
#include <boost/geometry/strategies/buffer.hpp>
#include <boost/geometry/strategies/side.hpp>
@@ -59,6 +60,12 @@ public :
OutputRange& output_range)
{
typedef typename coordinate_type<Point>::type coordinate_type;
typedef typename geometry::select_most_precise
<
coordinate_type,
double
>::type promoted_type;
// Generate a block along (left or right of) the segment
// Simulate a vector d (dx,dy)
@@ -66,17 +73,16 @@ public :
coordinate_type dy = get<1>(input_p2) - get<1>(input_p1);
// For normalization [0,1] (=dot product d.d, sqrt)
// TODO promoted_type
coordinate_type const length = geometry::math::sqrt(dx * dx + dy * dy);
promoted_type const length = geometry::math::sqrt(dx * dx + dy * dy);
// Because coordinates are not equal, length should not be zero
BOOST_ASSERT((! geometry::math::equals(length, 0)));
// Generate the normalized perpendicular p, to the left (ccw)
coordinate_type const px = -dy / length;
coordinate_type const py = dx / length;
promoted_type const px = -dy / length;
promoted_type const py = dx / length;
coordinate_type const d = distance.apply(input_p1, input_p2, side);
promoted_type const d = distance.apply(input_p1, input_p2, side);
output_range.resize(2);