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New get_extents(const std::vector<Points> &pts),

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refactored Lian Barsky line clipping
This commit is contained in:
Vojtech Bubnik 2020-11-16 10:20:47 +01:00
parent 32362cff0b
commit 84693a5810
5 changed files with 29 additions and 19 deletions
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25
src/libslic3r/Geometry.hpp
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@ -213,16 +213,7 @@ inline bool liang_barsky_line_clipping_interval(
double t0 = 0.0;
double t1 = 1.0;
// Traverse through left, right, bottom, top edges.
for (int edge = 0; edge < 4; ++ edge)
{
double p, q;
switch (edge) {
case 0: p = - v.x(); q = - bbox.min.x() + x0.x(); break;
case 1: p = v.x(); q = bbox.max.x() - x0.x(); break;
case 2: p = - v.y(); q = - bbox.min.y() + x0.y(); break;
default: p = v.y(); q = bbox.max.y() - x0.y(); break;
}
auto clip_side = [&x0, &v, &bbox, &t0, &t1](double p, double q) -> bool {
if (p == 0) {
if (q < 0)
// Line parallel to the bounding box edge is fully outside of the bounding box.
@ -247,10 +238,18 @@ inline bool liang_barsky_line_clipping_interval(
t1 = r;
}
}
return true;
};
if (clip_side(- v.x(), - bbox.min.x() + x0.x()) &&
clip_side( v.x(), bbox.max.x() - x0.x()) &&
clip_side(- v.y(), - bbox.min.y() + x0.y()) &&
clip_side( v.y(), bbox.max.y() - x0.y())) {
out_interval.first = t0;
out_interval.second = t1;
return true;
}
out_interval.first = t0;
out_interval.second = t1;
return true;
return false;
}
template<typename T>