public VectorTileFeature Clip(VectorTileFeature feature, double scale, double k1, double k2, int axis, Func <double[], double[], double, double[]> intersect, double minAll, double maxAll)
{
k1 /= scale;
k2 /= scale;
if (minAll >= k1 && maxAll <= k2)
{
return(feature); // trivial accept
}
else if (minAll > k2 || maxAll < k1)
{
return(null); // trivial reject
}
// var geometry = feature.Geometry;
var type = feature.Type;
var min = feature.Min[axis];
var max = feature.Max[axis];
if (min >= k1 && max <= k2)
{ // trivial accept
return(feature);
}
else if (min > k2 || max < k1)
{
return(null); // trivial reject
}
var slices = type == 1 ?
clipPoints(feature.GetPoints(), k1, k2, axis) :
clipGeometry(feature.GetRings(), k1, k2, axis, intersect, type == 3);
if ((slices.Length == 1) ? slices[0].Count > 0 : slices.Length > 0)
{
// if a feature got clipped, it will likely get clipped on the next zoom level as well,
// so there's no need to recalculate bboxes
return(new VectorTileFeature
{
Geometry = slices,
Type = type,
Tags = feature.Tags,
Min = feature.Min,
Max = feature.Max
});
}
return(null);
}
private VectorTileFeature CalcBBox(VectorTileFeature feature)
{
// var geometry = feature.Geome;
var min = feature.Min;
var max = feature.Max;
if (feature.Type == 1)
{
CalcRingBBox(min, max, feature.GetPoints());
}
else
{
var geometry = feature.GetRings();
for (var i = 0; i < geometry.Length; i++)
{
CalcRingBBox(min, max, geometry[i]);
}
}
return(feature);
}
private VectorTileFeature ShiftFeatureCoords(VectorTileFeature feature, double offset)
{
var newFeatures = new List <VectorTileFeature>();
var type = feature.Type;
if (type == 1)
{
return(new VectorTileFeature
{
Geometry = ShiftCoords(feature.GetPoints(), offset),
Type = type,
Tags = feature.Tags,
Min = new[] { feature.Min[0] + offset, feature.Min[1] },
Max = new[] { feature.Max[0] + offset, feature.Max[1] }
});
}
var newGeometry = new List <VectorTileGeometry>();
var rings = feature.GetRings();
for (var j = 0; j < rings.Length; j++)
{
newGeometry.Add(ShiftCoords(rings[j], offset));
}
return(new VectorTileFeature
{
Geometry = newGeometry.ToArray(),
Type = type,
Tags = feature.Tags,
Min = new[] { feature.Min[0] + offset, feature.Min[1] },
Max = new[] { feature.Max[0] + offset, feature.Max[1] }
});
}
