private static Polygon gpc_polygon_ToPolygon(gpc_polygon gpc_polygon)
{
Polygon polygon = null;
if (gpc_polygon.num_contours > 0)
{
polygon = new Polygon(gpc_polygon.num_contours);
int[] holeInt = new int[polygon.NumContours];
IntPtr ptr = gpc_polygon.hole;
if (polygon.NumContours > 0)
{
Marshal.Copy(gpc_polygon.hole, holeInt, 0, polygon.NumContours);
}
for (int i = 0; i < polygon.NumContours; ++i)
{
polygon.SetHole(i, holeInt[i] != 0);
}
ptr = gpc_polygon.contour;
for (int i = 0; i < polygon.NumContours; ++i)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
int numVertices = gpc_vtx_list.num_vertices;
polygon[i].Capacity = numVertices;
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < numVertices; ++j)
{
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure(ptr2, typeof(gpc_vertex));
polygon[i].Add(new Vec2d(gpc_vtx.x, gpc_vtx.y));
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
return(polygon);
}
public static void SavePolygon(string filename, bool writeHoleFlags, Polygon polygon)
{
gpc_polygon gpc_polygon = GpcWrapper.PolygonTo_gpc_polygon(polygon);
IntPtr fp = fopen(filename, "wb");
gpc_write_polygon(fp, writeHoleFlags?((int)1):((int)0), ref gpc_polygon);
fclose(fp);
GpcWrapper.Free_gpc_polygon(gpc_polygon);
}
private static void Free_gpc_polygon(gpc_polygon gpc_pol)
{
Marshal.FreeCoTaskMem(gpc_pol.hole);
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < gpc_pol.num_contours; i++)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
Marshal.FreeCoTaskMem(gpc_vtx_list.vertex);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
public static Tristrip PolygonToTristrip(Polygon polygon)
{
gpc_tristrip gpc_strip = new gpc_tristrip();
gpc_polygon gpc_pol = GpcWrapper.PolygonTo_gpc_polygon(polygon);
gpc_polygon_to_tristrip(ref gpc_pol, ref gpc_strip);
Tristrip tristrip = GpcWrapper.gpc_strip_ToTristrip(gpc_strip);
GpcWrapper.Free_gpc_polygon(gpc_pol);
GpcWrapper.gpc_free_tristrip(ref gpc_strip);
return(tristrip);
}
public static Polygon ReadPolygon(string filename, bool readHoleFlags)
{
gpc_polygon gpc_polygon = new gpc_polygon();
IntPtr fp = fopen(filename, "rb");
gpc_read_polygon(fp, readHoleFlags?((int)1):((int)0), ref gpc_polygon);
Polygon polygon = gpc_polygon_ToPolygon(gpc_polygon);
gpc_free_polygon(ref gpc_polygon);
fclose(fp);
return(polygon);
}
public static Polygon Clip( GpcOperation operation, Polygon subject_polygon, Polygon clip_polygon )
{
gpc_polygon gpc_polygon = new gpc_polygon();
gpc_polygon gpc_subject_polygon = GpcWrapper.PolygonTo_gpc_polygon( subject_polygon );
gpc_polygon gpc_clip_polygon = GpcWrapper.PolygonTo_gpc_polygon( clip_polygon );
gpc_polygon_clip( operation, ref gpc_subject_polygon, ref gpc_clip_polygon, ref gpc_polygon );
Polygon polygon = GpcWrapper.gpc_polygon_ToPolygon( gpc_polygon );
GpcWrapper.Free_gpc_polygon( gpc_subject_polygon );
GpcWrapper.Free_gpc_polygon( gpc_clip_polygon );
GpcWrapper.gpc_free_polygon( ref gpc_polygon );
return polygon;
}
public static Tristrip ClipToTristrip(GpcOperation operation, Polygon subject_polygon, Polygon clip_polygon)
{
gpc_tristrip gpc_strip = new gpc_tristrip();
gpc_polygon gpc_subject_polygon = GpcWrapper.PolygonTo_gpc_polygon(subject_polygon);
gpc_polygon gpc_clip_polygon = GpcWrapper.PolygonTo_gpc_polygon(clip_polygon);
gpc_tristrip_clip(operation, ref gpc_subject_polygon, ref gpc_clip_polygon, ref gpc_strip);
Tristrip tristrip = GpcWrapper.gpc_strip_ToTristrip(gpc_strip);
GpcWrapper.Free_gpc_polygon(gpc_subject_polygon);
GpcWrapper.Free_gpc_polygon(gpc_clip_polygon);
GpcWrapper.gpc_free_tristrip(ref gpc_strip);
return(tristrip);
}
public static Polygon Clip(GpcOperation operation, Polygon subject_polygon, Polygon clip_polygon)
{
gpc_polygon gpc_polygon = new gpc_polygon();
gpc_polygon gpc_subject_polygon = GpcWrapper.PolygonTo_gpc_polygon(subject_polygon);
gpc_polygon gpc_clip_polygon = GpcWrapper.PolygonTo_gpc_polygon(clip_polygon);
gpc_polygon_clip(operation, ref gpc_subject_polygon, ref gpc_clip_polygon, ref gpc_polygon);
Polygon polygon = GpcWrapper.gpc_polygon_ToPolygon(gpc_polygon);
GpcWrapper.Free_gpc_polygon(gpc_subject_polygon);
GpcWrapper.Free_gpc_polygon(gpc_clip_polygon);
GpcWrapper.gpc_free_polygon(ref gpc_polygon);
return(polygon);
}
private static gpc_polygon PolygonTo_gpc_polygon(GpcPolygon polygon)
{
gpc_polygon gpc_pol = new gpc_polygon();
gpc_pol.num_contours = polygon.NofContours;
int[] hole = new int[polygon.NofContours];
for (int i = 0; i < polygon.NofContours; i++)
{
hole[i] = (polygon.ContourIsHole[i] ? 1 : 0);
}
if (polygon.NofContours == 0)
{
//gpc_pol.hole = 0;
}
else
{
gpc_pol.hole = Marshal.AllocCoTaskMem(polygon.NofContours * Marshal.SizeOf(hole[0]));
}
if (polygon.NofContours > 0)
{
Marshal.Copy(hole, 0, gpc_pol.hole, polygon.NofContours);
gpc_pol.contour = Marshal.AllocCoTaskMem(polygon.NofContours * Marshal.SizeOf(new gpc_vertex_list()));
}
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < polygon.NofContours; i++)
{
gpc_vertex_list gpc_vtx_list = new gpc_vertex_list();
gpc_vtx_list.num_vertices = polygon.Contour[i].NofVertices;
gpc_vtx_list.vertex = Marshal.AllocCoTaskMem(polygon.Contour[i].NofVertices * Marshal.SizeOf(new gpc_vertex()));
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon.Contour[i].NofVertices; j++)
{
gpc_vertex gpc_vtx = new gpc_vertex();
gpc_vtx.x = polygon.Contour[i].Vertex[j].X;
gpc_vtx.y = polygon.Contour[i].Vertex[j].Y;
Marshal.StructureToPtr(gpc_vtx, ptr2, false);
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
Marshal.StructureToPtr(gpc_vtx_list, ptr, false);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
return(gpc_pol);
}
private static Polygon Gpc_polygon_ToPolygon(gpc_polygon gpc_polygon)
{
Polygon polygon = new Polygon()
{
NofContours = gpc_polygon.num_contours
};
polygon.ContourIsHole = new bool[polygon.NofContours];
polygon.Contour = new VertexList[polygon.NofContours];
short[] holeShort = new short[polygon.NofContours];
IntPtr ptr = gpc_polygon.hole;
if (polygon.NofContours > 0)
{
Marshal.Copy(gpc_polygon.hole, holeShort, 0, polygon.NofContours);
}
for (int i = 0; i < polygon.NofContours; i++)
{
polygon.ContourIsHole[i] = (holeShort[i] != 0);
}
ptr = gpc_polygon.contour;
for (int i = 0; i < polygon.NofContours; i++)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
polygon.Contour[i] = new VertexList()
{
NofVertices = gpc_vtx_list.num_vertices
};
polygon.Contour[i].Vertex = new Vertex[polygon.Contour[i].NofVertices];
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon.Contour[i].NofVertices; j++)
{
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure(ptr2, typeof(gpc_vertex));
polygon.Contour[i].Vertex[j].X = gpc_vtx.x;
polygon.Contour[i].Vertex[j].Y = gpc_vtx.y;
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
return(polygon);
}
private static gpc_polygon PolygonTo_gpc_polygon(Polygon polygon)
{
gpc_polygon gpc_pol = new gpc_polygon();
if (polygon != null)
{
gpc_pol.num_contours = polygon.NumContours;
int[] hole = new int[polygon.NumContours];
for (int i = 0; i < polygon.NumContours; ++i)
{
hole[i] = (polygon.IsHole(i) ? 1 : 0);
}
gpc_pol.hole = Marshal.AllocCoTaskMem(polygon.NumContours * Marshal.SizeOf(hole[0]));
if (polygon.NumContours > 0)
{
Marshal.Copy(hole, 0, gpc_pol.hole, polygon.NumContours);
gpc_pol.contour = Marshal.AllocCoTaskMem(polygon.NumContours * Marshal.SizeOf(new gpc_vertex_list()));
}
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < polygon.NumContours; ++i)
{
gpc_vertex_list gpc_vtx_list = new gpc_vertex_list();
gpc_vtx_list.num_vertices = polygon[i].Count;
gpc_vtx_list.vertex = Marshal.AllocCoTaskMem(polygon[i].Count * Marshal.SizeOf(new gpc_vertex()));
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon[i].Count; ++j)
{
gpc_vertex gpc_vtx = new gpc_vertex();
gpc_vtx.x = polygon[i][j].X;
gpc_vtx.y = polygon[i][j].Y;
Marshal.StructureToPtr(gpc_vtx, ptr2, false);
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
Marshal.StructureToPtr(gpc_vtx_list, ptr, false);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
return(gpc_pol);
}
private static extern void gpc_write_polygon([In] IntPtr fp, [In] int write_hole_flags, [In] ref gpc_polygon polygon);
private static extern void gpc_read_polygon([In] IntPtr fp, [In] int read_hole_flags, [In, Out] ref gpc_polygon polygon);
private static extern void gpc_free_polygon([In] ref gpc_polygon polygon);
private static extern void gpc_tristrip_clip([In] GpcOperation set_operation,
[In] ref gpc_polygon subject_polygon,
[In] ref gpc_polygon clip_polygon,
[In, Out] ref gpc_tristrip result_tristrip);
private static extern void gpc_polygon_to_tristrip([In] ref gpc_polygon polygon,
[In, Out] ref gpc_tristrip tristrip);
public static extern void gpc_polygon_clip([In] GpcOperation set_operation,
[In] ref gpc_polygon subject_polygon,
[In] ref gpc_polygon clip_polygon,
[In, Out] ref gpc_polygon result_polygon);
public static extern void gpc_free_polygon([In] ref gpc_polygon polygon);
private static gpc_polygon PolygonTo_gpc_polygon(GpcPolygon polygon)
{
gpc_polygon gpc_pol = new gpc_polygon();
gpc_pol.num_contours = polygon.NofContours;
int[] hole = new int[polygon.NofContours];
for (int i = 0; i < polygon.NofContours; i++)
hole[i] = (polygon.ContourIsHole[i] ? 1 : 0);
if (hole.Length > 0)
{
gpc_pol.hole = Marshal.AllocCoTaskMem(polygon.NofContours * Marshal.SizeOf(hole[0]));
Marshal.Copy(hole, 0, gpc_pol.hole, polygon.NofContours);
gpc_pol.contour = Marshal.AllocCoTaskMem(polygon.NofContours * Marshal.SizeOf(new gpc_vertex_list()));
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < polygon.NofContours; i++)
{
gpc_vertex_list gpc_vtx_list = new gpc_vertex_list();
gpc_vtx_list.num_vertices = polygon.Contour[i].NofVertices;
gpc_vtx_list.vertex = Marshal.AllocCoTaskMem(polygon.Contour[i].NofVertices * Marshal.SizeOf(new gpc_vertex()));
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon.Contour[i].NofVertices; j++)
{
gpc_vertex gpc_vtx = new gpc_vertex();
gpc_vtx.x = polygon.Contour[i].Vertex[j].X;
gpc_vtx.y = polygon.Contour[i].Vertex[j].Y;
Marshal.StructureToPtr(gpc_vtx, ptr2, false);
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
Marshal.StructureToPtr(gpc_vtx_list, ptr, false);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
return gpc_pol;
}
private static GpcPolygon gpc_polygon_ToPolygon(gpc_polygon gpc_polygon)
{
GpcPolygon polygon = new GpcPolygon();
polygon.NofContours = gpc_polygon.num_contours;
polygon.ContourIsHole = new bool[polygon.NofContours];
polygon.Contour = new GpcVertexList[polygon.NofContours];
short[] holeShort = new short[polygon.NofContours];
IntPtr ptr = gpc_polygon.hole;
if (holeShort.Length > 0)
{
Marshal.Copy(gpc_polygon.hole, holeShort, 0, polygon.NofContours);
for (int i = 0; i < polygon.NofContours; i++)
polygon.ContourIsHole[i] = (holeShort[i] != 0);
ptr = gpc_polygon.contour;
for (int i = 0; i < polygon.NofContours; i++)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
polygon.Contour[i] = new GpcVertexList();
polygon.Contour[i].NofVertices = gpc_vtx_list.num_vertices;
polygon.Contour[i].Vertex = new GpcVertex[polygon.Contour[i].NofVertices];
IntPtr ptr2 = gpc_vtx_list.vertex;
for (int j = 0; j < polygon.Contour[i].NofVertices; j++)
{
gpc_vertex gpc_vtx = (gpc_vertex)Marshal.PtrToStructure(ptr2, typeof(gpc_vertex));
polygon.Contour[i].Vertex[j].X = gpc_vtx.x;
polygon.Contour[i].Vertex[j].Y = gpc_vtx.y;
ptr2 = (IntPtr)(((int)ptr2) + Marshal.SizeOf(gpc_vtx));
}
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
return polygon;
}
private static void Free_gpc_polygon(gpc_polygon gpc_pol)
{
Marshal.FreeCoTaskMem(gpc_pol.hole);
IntPtr ptr = gpc_pol.contour;
for (int i = 0; i < gpc_pol.num_contours; i++)
{
gpc_vertex_list gpc_vtx_list = (gpc_vertex_list)Marshal.PtrToStructure(ptr, typeof(gpc_vertex_list));
Marshal.FreeCoTaskMem(gpc_vtx_list.vertex);
ptr = (IntPtr)(((int)ptr) + Marshal.SizeOf(gpc_vtx_list));
}
}
public static GpcPolygon ReadPolygon(string filename, bool readHoleFlags)
{
gpc_polygon gpc_polygon = new gpc_polygon();
IntPtr fp = fopen(filename, "rb");
gpc_read_polygon(fp, readHoleFlags ? ((int)1) : ((int)0), ref gpc_polygon);
GpcPolygon polygon = gpc_polygon_ToPolygon(gpc_polygon);
gpc_free_polygon(ref gpc_polygon);
fclose(fp);
return polygon;
}
