//"1,1;2,2;3,3"
public static void Main(string[] args)
{
//args = new string[3];
//string ss = "0,0;0,1;1,1;1,0";
//string ss1 = "0,0;0,1;1,1;1,0";
//string ss2 = "0";
//args[0] = ss;
//args[1] = ss1;
//args[2] = ss2;
if (args?.Count() != 3)
{
return;
}
try
{
string[] ptStr1 = args[0].Split(';');
string[] ptStr2 = args[1].Split(';');
//0：相差 1：相交 2：异或 3：合并
GpcOperation operation = (GpcOperation)(int.Parse(args[2]));
//组织多边形A顶点数据
GpcWrapper.Polygon polygonA = new GpcWrapper.Polygon();
PointF[] aa = new PointF[ptStr1.Count()];
for (int i = 0; i < ptStr1.Count(); i++)
{
var subPtStr = ptStr1[i].Split(',');
aa[i] = new PointF(float.Parse(subPtStr[0]),
float.Parse(subPtStr[1]));
}
VertexList vtxA = new VertexList(aa);
polygonA.AddContour(vtxA, false);
//组织多边形B顶点数据
GpcWrapper.Polygon polygonB = new GpcWrapper.Polygon();
PointF[] bb = new PointF[ptStr2.Count()];
for (int i = 0; i < ptStr2.Count(); i++)
{
var subPtStr = ptStr2[i].Split(',');
bb[i] = new PointF(float.Parse(subPtStr[0]),
float.Parse(subPtStr[1]));
}
VertexList vtxB = new VertexList(bb);
polygonB.AddContour(vtxB, false);
//调用GPC库的剪辑算法
GpcWrapper.Polygon result = polygonA.Clip(operation, polygonB);
//组织返回结果字符串
if (result.Contour == null || result.Contour.Count() == 0)
{
Console.WriteLine("");
return;
}
string str = string.Join(";", result.Contour[0].Vertex);
str = str.Replace("(", string.Empty).Replace(")", string.Empty);
Console.WriteLine(str);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
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;
}
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 Tristrip ClipToTristrip( GpcOperation operation, Polygon polygon )
{
return GpcWrapper.ClipToTristrip( operation, this, polygon );
}
private static gpc_polygon PolygonTo_gpc_polygon( Polygon 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 );
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;
}
public Polygon Clip( GpcOperation operation, Polygon polygon )
{
return GpcWrapper.Clip( operation, this, polygon );
}
private static Polygon gpc_polygon_ToPolygon( gpc_polygon gpc_polygon )
{
Polygon polygon = new Polygon();
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;
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();
polygon.Contour[i].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;
}
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 );
}
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 Polygon Clip(GpcOperation operation, Polygon polygon)
{
return(GpcWrapper.Clip(operation, this, polygon));
}
public Tristrip ClipToTristrip(GpcOperation operation, Polygon polygon)
{
return(GpcWrapper.ClipToTristrip(operation, this, polygon));
}