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Bugfix/point in polygon #1894

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Bugfix/point in polygon #1894

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c037b88
Update PolygonUtils.cs
artoonie Dec 8, 2022
8135fdc
Updating changelog
artoonie Dec 8, 2022
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1 change: 1 addition & 0 deletions documentation/docs/05-changelog.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
### Bug Fixes
- Fixes a bug where add collider feature didn't work for flat terrain mesh.
- Fix a bug where vector tile processing fired multiple times depending on Terrain/Image data states
- Fixed incorrect computation of PointInPolygon when point was near center of polygon
### Improvements
- Improves Directions factory and prefabs to provide better UX and support for all types of maps

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47 changes: 7 additions & 40 deletions sdkproject/Assets/Mapbox/Unity/Utilities/PolygonUtils.cs
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Expand Up @@ -17,54 +17,21 @@ public static class PolygonUtils
/// <param name="p">The point that is to be tested.</param>
public static bool PointInPolygon(Point2d<float> p, List<List<Point2d<float>>> polygon)
{
List<Point2d<float>> poly = polygon[0];

Point2d<float> p1;
Point2d<float> p2;
bool inside = false;

if (poly.Count < 3)
{
return inside;
}

var oldPoint = new Point2d<float>(
poly[poly.Count - 1].X
, poly[poly.Count - 1].Y
);

int j = poly.Count - 1;
for (int i = 0; i < poly.Count; i++)
{
var newPoint = new Point2d<float>(poly[i].X, poly[i].Y);

if (newPoint.X > oldPoint.X)
{
p1 = oldPoint;
p2 = newPoint;
}
else
if (poly[i].Y < p.Y && poly[j].Y >= p.Y || poly[j].Y < p.Y && poly[i].Y >= p.Y)
{
p1 = newPoint;
p2 = oldPoint;
if (poly[i].X + (p.Y - poly[i].Y) / (poly[j].Y - poly[i].Y) * (poly[j].X - poly[i].X) < p.X)
{
inside = !inside;
}
}

if (
(newPoint.X < p.X) == (p.X <= oldPoint.X)
&& (p.Y - (long)p1.Y) * (p2.X - p1.X) < (p2.Y - (long)p1.Y) * (p.X - p1.X)
)
{
inside = !inside;
}

oldPoint = newPoint;
j = i;
}

return inside;
}



}

}