public IPolygon CreatePolygon(IntPtr intptr_0)
{
IPolygon polygonClass = new Polygon() as IPolygon;
int num = TabRead._mitab_c_get_parts(intptr_0);
object value = Missing.Value;
for (int i = 0; i < num; i++)
{
int num1 = TabRead._mitab_c_get_vertex_count(intptr_0, i);
IRing ringClass = new ESRI.ArcGIS.Geometry.Ring() as IRing;
for (int j = 0; j < num1; j++)
{
IPoint pointClass = new Point()
{
X = TabRead._mitab_c_get_vertex_x(intptr_0, i, j),
Y = TabRead._mitab_c_get_vertex_y(intptr_0, i, j)
};
(ringClass as IPointCollection).AddPoint(pointClass, ref value, ref value);
}
ringClass.Close();
(polygonClass as IGeometryCollection).AddGeometry(ringClass, ref value, ref value);
}
return(polygonClass);
}
private Image SymbolToBitmap(IGradientFillSymbol iSymbol, int iStyle, int iWidth, int iHeight)
{
IntPtr iHDC = new IntPtr();
Bitmap iBitmap = new Bitmap(iWidth, iHeight);
Graphics iGraphics = System.Drawing.Graphics.FromImage(iBitmap);
tagRECT itagRECT;
IEnvelope iEnvelope = new EnvelopeClass() as IEnvelope;
IDisplayTransformation iDisplayTransformation;
IPoint iPoint;
IGeometryCollection iPolyline;
IGeometryCollection iPolygon;
IRing iRing;
ISegmentCollection iSegmentCollection;
IGeometry iGeometry = null;
object Missing = Type.Missing;
iEnvelope.PutCoords(0, 0, iWidth, iHeight);
itagRECT.left = 0;
itagRECT.right = iWidth;
itagRECT.top = 0;
itagRECT.bottom = iHeight;
iDisplayTransformation = new DisplayTransformationClass();
iDisplayTransformation.VisibleBounds = iEnvelope;
iDisplayTransformation.Bounds = iEnvelope;
iDisplayTransformation.set_DeviceFrame(ref itagRECT);
iDisplayTransformation.Resolution = iGraphics.DpiX / 100000;
iHDC = iGraphics.GetHdc();
//获取Geometry;
if (iSymbol is ESRI.ArcGIS.Display.IMarkerSymbol)
{
switch (iStyle)
{
case 0:
iPoint = new ESRI.ArcGIS.Geometry.Point();
iPoint.PutCoords(iWidth / 2, iHeight / 2);
iGeometry = iPoint;
break;
default:
break;
}
}
else
{
if (iSymbol is ESRI.ArcGIS.Display.ILineSymbol)
{
iSegmentCollection = new ESRI.ArcGIS.Geometry.Path() as ISegmentCollection;
iPolyline = new ESRI.ArcGIS.Geometry.Polyline() as IGeometryCollection;
switch (iStyle)
{
case 0:
iSegmentCollection.AddSegment(CreateLine(0, iHeight / 2, iWidth, iHeight / 2) as ISegment, ref Missing, ref Missing);
iPolyline.AddGeometry(iSegmentCollection as IGeometry, ref Missing, ref Missing);
iGeometry = iPolyline as IGeometry;
break;
case 1:
iSegmentCollection.AddSegment(CreateLine(0, iHeight / 4, iWidth / 4, 3 * iHeight / 4) as ISegment, ref Missing, ref Missing);
iSegmentCollection.AddSegment(CreateLine(iWidth / 4, 3 * iHeight / 4, 3 * iWidth / 4, iHeight / 4) as ISegment, ref Missing, ref Missing);
iSegmentCollection.AddSegment(CreateLine(3 * iWidth / 4, iHeight / 4, iWidth, 3 * iHeight / 4) as ISegment, ref Missing, ref Missing);
iPolyline.AddGeometry(iSegmentCollection as IGeometry, ref Missing, ref Missing);
iGeometry = iPolyline as IGeometry;
break;
default:
break;
}
}
else
if (iSymbol is ESRI.ArcGIS.Display.IFillSymbol)
{
iSegmentCollection = new ESRI.ArcGIS.Geometry.Ring() as ISegmentCollection;
iPolygon = new ESRI.ArcGIS.Geometry.Polygon() as IGeometryCollection;
switch (iStyle)
{
case 0:
iSegmentCollection.AddSegment(CreateLine(5, iHeight - 5, iWidth - 6, iHeight - 5) as ISegment, ref Missing, ref Missing);
iSegmentCollection.AddSegment(CreateLine(iWidth - 6, iHeight - 5, iWidth - 6, 6) as ISegment, ref Missing, ref Missing);
iSegmentCollection.AddSegment(CreateLine(iWidth - 6, 6, 5, 6) as ISegment, ref Missing, ref Missing);
iRing = iSegmentCollection as IRing;
iRing.Close();
iPolygon.AddGeometry(iSegmentCollection as IGeometry, ref Missing, ref Missing);
iGeometry = iPolygon as IGeometry;
break;
default:
break;
}
}
else
if (iSymbol is ESRI.ArcGIS.Display.ISimpleTextSymbol)
{
switch (iStyle)
{
case 0:
iPoint = new ESRI.ArcGIS.Geometry.Point();
iPoint.PutCoords(iWidth / 2, iHeight / 2);
iGeometry = iPoint;
break;
default:
break;
}
}
}////////////////////////
if (iGeometry == null)
{
MessageBox.Show("几何对象不符合！", "错误");
return(null);
}
ISymbol pOutputSymbol = iSymbol as ISymbol;
pOutputSymbol.SetupDC(iHDC.ToInt32(), iDisplayTransformation);
pOutputSymbol.Draw(iGeometry);
pOutputSymbol.ResetDC();
iGraphics.ReleaseHdc(iHDC);
iGraphics.Dispose();
return(iBitmap);
}