public static ScanEdgeCollection Create(
IPath polygon,
MemoryAllocator allocator,
int subsampling)
{
TessellatedMultipolygon multipolygon = TessellatedMultipolygon.Create(polygon, allocator);
return(Create(multipolygon, allocator, subsampling));
}
public void Create_FromStar()
{
var polygon = new Star(100, 100, 5, 30, 60);
PointF[] points = polygon.Flatten().Single().Points.Span.ToArray();
using var multipolygon = TessellatedMultipolygon.Create(polygon, MemoryAllocator);
VerifyRing(multipolygon[0], points, true, false);
}
public void Create_FromRecangle()
{
var polygon = new RectangularPolygon(10, 20, 100, 50);
PointF[] points = polygon.Flatten().Single().Points.Span.ToArray();
using var multipolygon = TessellatedMultipolygon.Create(polygon, MemoryAllocator);
VerifyRing(multipolygon[0], points, true, false);
Assert.Equal(4, multipolygon.TotalVertexCount);
}
public void Create_FromPolygon_Case2(bool reverseOriginal)
{
PointF[] points = PolygonFactory.CreatePointArray((0, 0), (2, 0), (3, 1), (3, 0), (6, 0), (6, 2), (5, 2), (5, 1), (4, 1), (4, 2), (2, 2), (1, 1), (0, 2));
if (reverseOriginal)
{
points.AsSpan().Reverse();
}
var polygon = new Polygon(new LinearLineSegment(points));
using var multipolygon = TessellatedMultipolygon.Create(polygon, MemoryAllocator);
VerifyRing(multipolygon[0], points, !reverseOriginal, false);
}
public void Create_FromPolygon_Case1(bool reverseOriginal)
{
PointF[] points = PolygonFactory.CreatePointArray((0, 3), (3, 3), (3, 0), (1, 2), (1, 1), (0, 0));
if (reverseOriginal)
{
points.AsSpan().Reverse();
}
var polygon = new Polygon(new LinearLineSegment(points));
using var multipolygon = TessellatedMultipolygon.Create(polygon, MemoryAllocator);
VerifyRing(multipolygon[0], points, reverseOriginal, false);
Assert.Equal(6, multipolygon.TotalVertexCount);
}
public static PolygonScanner Create(
IPath polygon,
int minY,
int maxY,
int subsampling,
IntersectionRule intersectionRule,
MemoryAllocator allocator)
{
var multipolygon = TessellatedMultipolygon.Create(polygon, allocator);
var edges = ScanEdgeCollection.Create(multipolygon, allocator, subsampling);
var scanner = new PolygonScanner(edges, multipolygon.TotalVertexCount * 2, minY, maxY, subsampling, intersectionRule, allocator);
scanner.Init();
return(scanner);
}