// calculates extent (bounding box) of shapefile layer -
// the extent is slightly larger than original shapefile extent:
// values are rounded to whole pixels
private MapWinGIS.Extents calcShapefileExtent(MapWinGIS.Shapefile shp)
{
double cellSize = m_DefaultCellSize;
Utils.string2double(txtCellSize.Text, out cellSize);
MapWinGIS.Extents ext = shp.Extents;
double xMin = ((int)(ext.xMin / cellSize)) * cellSize;
double yMin = ((int)(ext.yMin / cellSize)) * cellSize;
int nCols = ((int)( (ext.xMax - ext.xMin) / cellSize )) + 1;
lblNumberCols.Text = nCols.ToString();
int nRows = ((int)( (ext.yMax - ext.yMin) / cellSize )) + 1;
lblNumberRows.Text = nRows.ToString();
double xMax = xMin + nCols * cellSize;
double yMax = yMin + nRows * cellSize;
MapWinGIS.Extents newExtents = new MapWinGIS.Extents();
newExtents.SetBounds(xMin, yMin, 0, xMax, yMax, 0);
return newExtents;
}
/// <summary>
/// Overloaded version of the function
/// Sets the "grid extent" box to the same extention as the grid header
/// </summary>
/// <param name="header"></param>
private void UpdateExtentBox(MapWinGIS.GridHeader header)
{
double xMin = header.XllCenter - (header.dX / 2.0);
double yMin = header.YllCenter - (header.dY / 2.0);
double nCols = header.NumberCols;
double nRows = header.NumberRows;
double xMax = xMin + header.dX * nCols;
double yMax = yMin + header.dY * nRows;
txtMinX.Text = xMin.ToString();
txtMinY.Text = yMin.ToString();
txtMaxX.Text = xMax.ToString();
txtMaxY.Text = yMax.ToString();
lblNumberCols.Text = nCols.ToString();
lblNumberRows.Text = nRows.ToString();
}
/// <summary>
/// Creates a new form object for setting properties of the
/// new grid
/// </summary>
/// <param name="IMapWin">The MapWindow interface</param>
/// <param name="shpFileName">File name of the shapefile</param>
/// <param name="fieldType">Type of field containing data</param>
public frmGrid(MapWindow.Interfaces.IMapWin IMapWin,
string shpFileName, MapWinGIS.FieldType fieldType)
{
InitializeComponent();
//setup event handler
this.txtCellSize.TextChanged += new EventHandler(txtCellSize_TextChanged);
//initialize the global variables and default values
m_MapWin = IMapWin;
m_ShpFileName = shpFileName;
m_FieldType = fieldType;
m_DefaultCellSize = calcDefaultCellsize();
m_DefaultNodataValue = -9999F;
m_GridHeader = new MapWinGIS.GridHeader();
//populate the combo boxes
populateGridList();
populateExtentLayers();
populateDataTypes();
populateFileTypes();
}
//returns the appropriate grid extension
private string calcGridExtension(MapWinGIS.GridFileType grType)
{
switch (grType)
{
case MapWinGIS.GridFileType.Ascii:
return ".asc";
case MapWinGIS.GridFileType.Binary:
return ".bgd";
case MapWinGIS.GridFileType.GeoTiff:
return ".tif";
default:
return ".asc";
}
}
// gets the corresponding grid data type from shapefile field data type
private MapWinGIS.GridDataType calcGridDataType(MapWinGIS.FieldType fieldType)
{
switch (fieldType)
{
case MapWinGIS.FieldType.DOUBLE_FIELD:
return MapWinGIS.GridDataType.DoubleDataType;
case MapWinGIS.FieldType.INTEGER_FIELD:
return MapWinGIS.GridDataType.LongDataType;
default:
return MapWinGIS.GridDataType.FloatDataType;
}
}
//returns the filter used for opening grid in the file dialog
private string calcDialogFilter(MapWinGIS.GridFileType grType)
{
switch (grType)
{
case MapWinGIS.GridFileType.Ascii:
return "Ascii text (*.asc)|*.asc;*.txt";
case MapWinGIS.GridFileType.Binary:
return "USU Binary (*.bgd)|*.bgd";
case MapWinGIS.GridFileType.GeoTiff:
return "GeoTiff (*.tif)|*.tif";
default:
return "Ascii text (*.asc)|*.asc;*.txt";
}
}
/// <summary>
/// writes the pixel values from arrayList to grid
/// </summary>
/// <param name="gr"></param>
/// <param name="pxList"></param>
/// <param name="val"></param>
/// <param name="cback"></param>
private void writePxList(MapWinGIS.Grid gr, MapWinGIS.GridDataType grType,
System.Collections.ArrayList pxList, object val, MapWinGIS.ICallback cback)
{
switch (grType)
{
case GridDataType.ShortDataType:
short v1 = Convert.ToInt16(val);
foreach (GridPixel pix in pxList)
{
gr.set_Value(pix.col, pix.row, v1);
}
break;
case GridDataType.LongDataType:
int v2 = Convert.ToInt32(val);
foreach (GridPixel pix in pxList)
{
gr.set_Value(pix.col, pix.row, v2);
}
break;
case GridDataType.FloatDataType:
float v3 = Convert.ToSingle(val);
foreach (GridPixel pix in pxList)
{
gr.set_Value(pix.col, pix.row, v3);
}
break;
case GridDataType.DoubleDataType:
double v4 = Convert.ToDouble(val);
foreach (GridPixel pix in pxList)
{
gr.set_Value(pix.col, pix.row, v4);
}
break;
default:
reportError("the grid data type " + grType.ToString() + "is not supported.", cback);
break;
}
pxList.Clear();
}
/// <summary>
/// returns the shape's attribute field value
/// </summary>
private object GetCellValue(MapWinGIS.Shapefile sf, int fieldIndex, int shapeIndex, object noDt)
{
object value;
try
{
value = sf.get_CellValue(fieldIndex, shapeIndex);
}
catch (Exception ex)
{
value = noDt; //if no data is returned
}
return value;
}
/// <summary>
/// reports the progress
/// </summary>
private void reportProgress(int itemsDone, int numItems,
string keyOfSender, MapWinGIS.ICallback cback)
{
if (cback != null)
{
int pct = (int)Math.Round(((double)itemsDone / (double)numItems) * 100);
cback.Progress(keyOfSender, pct, "converting shapes");
}
}
/// <summary>
/// reports an error
/// </summary>
private void reportError(string errorMsg, MapWinGIS.ICallback cback)
{
if (cback != null)
{
cback.Error("shapefile to grid: ", errorMsg);
}
}
/// <summary>
/// This function converts a polygon shapefile to grid. It implements the line-scan algorithm.
/// <param name="PolySf">The polygon shapefile</param>
/// <param name="FldID">The field index</param>
/// <param name="Newgrd">File name of the new grid</param>
/// <param name="header">Header object of the new grid</param>
/// <param name="writePxDeleg">Delegate function for writing the grid pixels</param>
/// <param name="nodatavalue">'no data' value</param>
/// <param name="cback">can be used to report progress (optional)</param>
/// <returns>true if successful</returns>
//
// AUTHOR NAME: Enrico A. Chiaradia
// FROM: University of Milan (Italy)
// e.mail: [email protected]
//
// For details about the line-scan algorithm,
// please refer to http://www.profc.udec.cl/~gabriel/tutoriales/giswb/vol1/cp3/cp3-6.htm
//
// for each shape in PolySf
// 0) get the shape value (in the shapefile table)
// 1) load all the borders in a matrix composed by x(startpoint), x(endpoint), slope and share
// 2) define x of first scan line
// for each scan lines
// 3) calculate intersections with polygon border
// 4) sort intersections from lower Y to the higther
// 5) convert line space between two consecutive intersection to raster
private bool Poly2Grid(MapWinGIS.Shapefile PolySf, int FldID, MapWinGIS.Grid Newgrd,
MapWinGIS.GridHeader header, MapWinGIS.GridDataType grType,
MapWinGIS.ICallback cback)
{
double xMin, xMax;
double x0, x1, x2, y0, y1, y2, m, q;
int nShps, nVs, i, s, nP, p, tempn, v, b;
object val;
bool flg;
bord brd; //struct to keep a border
System.Collections.ArrayList bordi2; //list of borders
int perc = 1; //percent shapes done
int shpsPerc;
MapWinGIS.Shape PolyShp; //the polygon shape
//count the number of shapes
nShps = PolySf.NumShapes;
shpsPerc = NumPercentShapes(perc, nShps); //percent of progress
for( s = 0; s < nShps; ++s )
{
//for each shape, determine the extent and the number of parts
i = 0;
PolyShp = PolySf.get_Shape(s);
nP = PolyShp.NumParts;
xMin = PolyShp.Extents.xMin;
//yMin = PolyShp.Extents.yMin;
xMax = PolyShp.Extents.xMax;
//yMax = PolyShp.Extents.yMax;
//exclude shapes which are completely outside of the grid extents
if (!IsGridContainsShape(PolyShp, header))
{
continue;
}
//return the shape's value
val = GetCellValue(PolySf, FldID, s, header.NodataValue);
//load polygon borders
nVs = PolyShp.numPoints - 1;
bordi2 = new System.Collections.ArrayList(nVs + 1);
b = -1;
tempn = 0;
for( p = 0; p < nP; ++p )
{
x0 = PolyShp.get_Point(tempn).x;
y0 = PolyShp.get_Point(tempn).y;
for( v = tempn; v < nVs; ++v )
{
x1 = PolyShp.get_Point(v).x;
x2 = PolyShp.get_Point(v + 1).x;
y1 = PolyShp.get_Point(v).y;
y2 = PolyShp.get_Point(v + 1).y;
if (x1 != x2) // no vertical lines
{
m = (y2 - y1) / (x2 - x1);
q = y1 - (m * x1);
//add border to the list
b = b + 1;
brd = new bord();
brd.x1 = x1;
brd.x2 = x2;
brd.m = m;
brd.q = q;
bordi2.Add(brd);
}
//in case of multi-parts polygon
if( (x2 == x0) && (y2 == y0) )
{
tempn = v + 2;
break;
}
} //Next v
} // next p
//define the first line-scan
double xstart;
// 20 nov 07 added by Enrico A. Chiaradia
//necessary if grid extentions differ from shapefile extentions
if ( xMin >= header.XllCenter )
{
xstart = FirstLineXY(xMin, header.XllCenter, header.dX, 1);
}
else
{
xstart = FirstLineXY(xMin, header.XllCenter, header.dX, -1);
}
// the list of intersection y-values
System.Collections.ArrayList y_int = new System.Collections.ArrayList();
System.Collections.ArrayList pixels = new System.Collections.ArrayList();
do
{
flg = Interseca(bordi2, y_int, xstart);
flg = SortArray(y_int);
flg = ScanLine2(y_int, xstart, ref pixels, ref Newgrd, header, val, cback);
xstart = xstart + header.dX;
}
while ( xstart <= xMax );
writePxList(Newgrd, grType, pixels, val, cback);
//report the progress
if (s >= shpsPerc)
{
reportProgress(shpsPerc, nShps, "shapefile to grid", cback);
perc = (int)( (s * 100) / nShps );
shpsPerc = NumPercentShapes(perc + 1, nShps);
}
} // next shape
reportProgress(100, 100, "shapefile to grid", cback); //100 % shapes done
return true;
}
/// <summary>
/// convert point shapefile to grid
/// </summary>
private bool Point2Grid(MapWinGIS.Shapefile PointSf, int FldID, MapWinGIS.Grid Newgrd,
MapWinGIS.GridHeader header, MapWinGIS.GridDataType grType, MapWinGIS.ICallback cback)
{
//count the number of shapes
int s;
MapWinGIS.Shape shp;
MapWinGIS.Point pt = new MapWinGIS.Point();
object val;
GridPixel px;
int nShps = PointSf.NumShapes;
int perc = 1;
int shpsPerc = NumPercentShapes(perc, nShps); //percent of progress
for (s = 0; s < nShps; ++s)
{
//get the point
shp = PointSf.get_Shape(s);
//exclude shapes which are completely outside of the grid extents
if (!IsGridContainsShape(shp, header))
{
continue;
}
if (shp.numPoints > 0)
{
pt = shp.get_Point(0);
if (pt != null)
{
//return the shape's value and write the pixel
val = GetCellValue(PointSf, FldID, s, header.NodataValue);
Newgrd.ProjToCell(pt.x, pt.y, out px.col, out px.row);
writePx(Newgrd, grType, px, val, cback);
}
}
//report the progress
if (s >= shpsPerc)
{
perc = (int)((s * 100) / nShps);
shpsPerc = NumPercentShapes(perc + 1, nShps);
reportProgress(shpsPerc, nShps, "shapefile to grid", cback);
}
}
return true;
}
private bool Multipoint2Grid(MapWinGIS.Shapefile MultipointSf, int FldID, MapWinGIS.Grid Newgrd,
MapWinGIS.GridHeader header, MapWinGIS.GridDataType grType, MapWinGIS.ICallback cback)
{
//count the number of shapes
int s, p;
MapWinGIS.Shape shp;
MapWinGIS.Point pt;
ArrayList pixels = new ArrayList();
object val;
GridPixel px;
int nShps = MultipointSf.NumShapes;
int nPts = 0;
int perc = 1;
int shpsPerc = NumPercentShapes(perc, nShps); //percent of progress
for (s = 0; s < nShps; ++s)
{
//get the shape
shp = MultipointSf.get_Shape(s);
//exclude shapes which are completely outside of the grid extents
if (!IsGridContainsShape(shp, header))
{
continue;
}
//get the shape's value
val = GetCellValue(MultipointSf, FldID, s, header.NodataValue);
nPts = shp.numPoints;
for (p = 0; p < nPts; ++p)
{
//write pixel values
pt = shp.get_Point(p);
Newgrd.ProjToCell(pt.x, pt.y, out px.col, out px.row);
pixels.Add(px);
writePxList(Newgrd, grType, pixels, val, cback);
}
//report the progress
if (s >= shpsPerc)
{
reportProgress(shpsPerc, nShps, "shapefile to grid", cback);
perc = (int)((s * 100) / nShps);
shpsPerc = NumPercentShapes(perc + 1, nShps);
}
}
return true;
}
/// <summary>
/// converts a Line shapefile to grid using Bresenham algorithm
/// </summary>
/// <param name="PolySf">Polygon shapefile object</param>
/// <param name="FldID">Field index</param>
/// <param name="Newgrd">New grid object</param>
/// <param name="header">Grid header</param>
/// <param name="nodatavalue"></param>
/// <param name="cback">optional, for reporting progress</param>
/// <returns>true if successful</returns>
private bool Line2Grid(MapWinGIS.Shapefile LineSf, int FldID, MapWinGIS.Grid Newgrd,
MapWinGIS.GridHeader header, MapWinGIS.GridDataType grType, MapWinGIS.ICallback cback)
{
int numParts, numPoints;
int curPartStart, curPartEnd, vertexCol, vertexRow, lastCol, lastRow;
int nShps = LineSf.NumShapes;
int perc = 1;
int shpsPerc = NumPercentShapes(perc, nShps); //percent of progress
int s = 0; //shape number
int p = 0; //part number
int k = 0; //point number
MapWinGIS.Shape LineShp = new MapWinGIS.Shape();
MapWinGIS.Point curPoint;
//Rasterization ras = new Rasterization(); //rasterization class, contains the code of
//lineToGrid methods independent on MapWinGIS functions
ArrayList vertices = new ArrayList(); //list of line vertex points
ArrayList pixels = new ArrayList(); //list of calculated pixels on the line
GridPixel px;
object val; //the shape's value
for (s = 0; s < nShps; ++s)
{
LineShp = LineSf.get_Shape(s);
numParts = LineShp.NumParts;
numPoints = LineShp.numPoints;
//exclude shapes which are completely outside of the grid extents
if (!IsGridContainsShape(LineShp, header))
{
continue;
}
//get the shape's value
val = GetCellValue(LineSf, FldID, s, header.NodataValue);
//process each part of the polyline
curPartStart = 0;
for (p = 0; p < numParts; ++p)
{
vertices.Clear();
pixels.Clear();
curPartStart = LineShp.get_Part(p);
// check for multi-part lines
if (p < numParts - 1)
{
curPartEnd = LineShp.get_Part(p + 1) - 1;
}
else
{
curPartEnd = numPoints - 1;
}
//go to next part if there's zero points
if (numPoints <= 0)
{
continue;
}
// add all points of current part to rasterization list
// always add the first point of the part (convert its coordinates to
// grid row and column)
curPoint = LineShp.get_Point(curPartStart);
Newgrd.ProjToCell(curPoint.x, curPoint.y,
out vertexCol, out vertexRow);
px.col = vertexCol;
px.row = vertexRow;
vertices.Add(px);
lastCol = vertexCol; lastRow = vertexRow;
// add all other points with different grid coordinates
for (k = curPartStart + 1; k <= curPartEnd; ++k)
{
// (check if it has a different row or column than the previous point)
curPoint = LineShp.get_Point(k);
Newgrd.ProjToCell(curPoint.x, curPoint.y,
out vertexCol, out vertexRow);
if (vertexCol != lastCol || vertexRow != lastRow)
{
px.col = vertexCol;
px.row = vertexRow;
vertices.Add(px);
lastCol = vertexCol;
lastRow = vertexRow;
}
}
// convert the polyline and write pixels to grid
LineBresenham(vertices, pixels);
writePxList(Newgrd, grType, pixels, val, cback);
}
//report the progress
if (s >= shpsPerc)
{
reportProgress(shpsPerc, nShps, "shapefile to grid", cback);
perc = (int)((s * 100) / nShps);
shpsPerc = NumPercentShapes(perc + 1, nShps);
}
}
return true;
}
/// <summary>
/// determine if the shape is partially inside grid extents
/// </summary>
/// <param name="shp"></param>
/// <param name="hdr"></param>
/// <returns>false, if the shape is completely outside grid extents
/// true, if it's at least partially inside</returns>
private bool IsGridContainsShape(MapWinGIS.Shape shp, MapWinGIS.GridHeader hdr)
{
double gridXmin = hdr.XllCenter;
double gridYmin = hdr.YllCenter;
double gridXmax = gridXmin + (hdr.NumberCols * hdr.dX);
double gridYmax = gridYmin + (hdr.NumberRows * hdr.dY);
MapWinGIS.Extents ext = shp.Extents;
if (ext.xMin > gridXmax || ext.yMin > gridYmax ||
ext.xMax < gridXmin || ext.yMax < gridYmin)
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// populate all the grid cells between two consecutive intersections with shape's value
/// </summary>
private bool ScanLine2(System.Collections.ArrayList vettore, double xref,
ref System.Collections.ArrayList pixels, ref MapWinGIS.Grid gr, MapWinGIS.GridHeader header,
object value, MapWinGIS.ICallback cback)
{
bool result = false;
bool control;
double yll, ystart, yend, ycellstart;
double pxsize;
int c, r, v;
r = 0;
GridPixel curPx;
control = false;
yll = header.YllCenter;
pxsize = header.dX;
ystart = 0;
for (v = vettore.Count - 1; v >= 0; --v)
{
if (control == false)
{
ystart = (double)vettore[v];
control = true;
}
else
{
yend = (double)vettore[v];
ycellstart = FirstLineXY(ystart, yll, pxsize, -1);
do
{
gr.ProjToCell(xref, ycellstart, out c, out r);
curPx.col = c;
curPx.row = r;
pixels.Add(curPx);
ycellstart = ycellstart - pxsize;
}
while (ycellstart >= yend);
control = false;
}
}
return result;
}
// updates values in the "grid extent" box
// (min. X, min. Y, max. X, max. Y, columns, rows)
/// <summary>
/// updates values in the "grid extent" box
/// (min. X, min. Y, max. X, max. Y, num.columns, num.rows.
/// The extent values are rounded to nearest whole cellsize
/// </summary>
/// <param name="extents">the extents of new grid</param>
/// <param name="roundValues">set to TRUE if the xMin and yMin values
/// should be rounded to whole cell size.</param>
private void UpdateExtentBox(MapWinGIS.Extents extents)
{
txtMinX.Text = extents.xMin.ToString();
txtMinY.Text = extents.yMin.ToString();
txtMaxX.Text = extents.xMax.ToString();
txtMaxY.Text = extents.yMax.ToString();
UpdateExtentBox();
}
private void writePx(MapWinGIS.Grid gr, MapWinGIS.GridDataType grType,
GridPixel pix, object val, MapWinGIS.ICallback cback)
{
switch (grType)
{
case GridDataType.ShortDataType:
short v1 = Convert.ToInt16(val);
gr.set_Value(pix.col, pix.row, v1);
break;
case GridDataType.LongDataType:
int v2 = Convert.ToInt32(val);
gr.set_Value(pix.col, pix.row, v2);
break;
case GridDataType.FloatDataType:
float v3 = Convert.ToSingle(val);
gr.set_Value(pix.col, pix.row, v3);
break;
case GridDataType.DoubleDataType:
double v4 = Convert.ToDouble(val);
gr.set_Value(pix.col, pix.row, v4);
break;
default:
reportError("the grid data type " + grType.ToString() + "is not supported.", cback);
break;
}
}
// updates the internal Grid header object which stores
// the extent and cellsize of the new grid
private void UpdateGridHeader(double xMin, double yMin, double xMax, double yMax,
double dX, double dY, MapWinGIS.GridHeader hdr)
{
if (hdr == null)
{
hdr = new MapWinGIS.GridHeader();
}
double noData = m_DefaultNodataValue;
double halfX = dX / 2F;
double halfY = dY / 2F;
double xllCenter = xMin + halfX;
double yllCenter = yMin + halfX;
int nCols = (int) ( Math.Abs( xMax - xMin ) / dX );
int nRows = (int) ( Math.Abs( yMax - yMin ) / dY );
hdr.dX = dX;
hdr.dY = dY;
hdr.NumberCols = nCols;
hdr.NumberRows = nRows;
hdr.XllCenter = xllCenter;
hdr.YllCenter = yllCenter;
hdr.NodataValue = noData;
}
/// <summary>
/// 'Copyright (C) 2008 Enrico Antonio Chiaradia, UNIMI
///'This program is free software; you can redistribute it and/or
///'modify it under the terms of the GNU General Public License
///'version 2, 1991 as published by the Free Software Foundation.
///'This program is distributed in the hope that it will be useful,
///'but WITHOUT ANY WARRANTY; without even the implied warranty of
///'MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
///'GNU General Public License for more details.
///'A copy of the full GNU General Public License is available at:
///'http://www.gnu.org/copyleft/gpl.html
///'or from:
///'The Free Software Foundation, Inc., 59 Temple Place - Suite 330,
///'Boston, MA 02111-1307, USA.
///'If you wish to use or incorporate this program (or parts of it) into
///'other software that does not meet the GNU General Public License
///'conditions contact the author to request permission.
///'If you have any question or suggestion, please contact the author.
///'Enrico A. Chiaradia
///'University of Milan
///'Ist. di Idraulica Agraria
///'via Celoria 2
///'20133, Milan, Italy
///'email: [email protected]
/// </summary>
/// <param name="sfPath">the name of the shapefile</param>
/// <param name="resultGridPath">the name of the new grid</param>
/// <param name="gridFileType">file type of the new grid</param>
/// <param name="gridDataType">data format of the new grid</param>
/// <param name="sfValueField">the name of the field that contains data</param>
/// <param name="resultGridHeader">contains information about dimension of the new grid</param>
/// <param name="callback">(optional) reports progress and error messages</param>
/// <returns></returns>
public bool ShapefileToGrid2(string SfNm, string GrdName,
MapWinGIS.GridFileType GrdFileType, MapWinGIS.GridDataType GrdDataType,
string Fldname, MapWinGIS.GridHeader GrdHd,
MapWinGIS.ICallback cback)
{
int i;
bool flg;
string projStr;
//open the shapefile
MapWinGIS.Shapefile MySf = new MapWinGIS.Shapefile();
flg = MySf.Open(SfNm, cback);
if (flg == false)
{
reportError("ERROR in opening shapefile: " + SfNm, cback);
MySf.Close();
return false;
}
//get the handle for the field
MapWinGIS.Field field;
int FldId = -1;
int LayFldNum = MySf.NumFields;
i = 0;
for (i = 0; i < LayFldNum; ++i)
{
field = MySf.get_Field(i);
if (field.Name.ToLower() == Fldname.ToLower())
{
FldId = i;
break;
}
}
if (FldId < 0)
{
reportError("The shapefile " + SfNm + " doesn't have a field " + Fldname, cback);
MySf.Close();
return false;
}
//copy shapefile projection
projStr = MySf.Projection;
if (!MapWinUtility.Strings.IsEmpty(projStr))
{
GrdHd.Projection = projStr;
}
//create a new grid and a new gridheader
MapWinGIS.Grid NewGrd = new MapWinGIS.Grid();
flg = NewGrd.CreateNew(GrdName, GrdHd, GrdDataType, GrdHd.NodataValue, false, GrdFileType, cback);
if (flg == false)
{
reportError("ERROR in grid initialization: " + GrdName, cback);
NewGrd.Close();
MySf.Close();
}
//verify the type of shapefile and call rasterization function
MapWinGIS.ShpfileType SfType = new MapWinGIS.ShpfileType();
SfType = MySf.ShapefileType;
switch (SfType)
{
case ShpfileType.SHP_POLYGON:
case ShpfileType.SHP_POLYGONM:
case ShpfileType.SHP_POLYGONZ:
flg = Poly2Grid(MySf, FldId, NewGrd, GrdHd, GrdDataType, cback);
break;
case ShpfileType.SHP_POLYLINE:
case ShpfileType.SHP_POLYLINEM:
case ShpfileType.SHP_POLYLINEZ:
flg = Line2Grid(MySf, FldId, NewGrd, GrdHd, GrdDataType, cback);
break;
case ShpfileType.SHP_POINT:
case ShpfileType.SHP_POINTM:
case ShpfileType.SHP_POINTZ:
flg = Point2Grid(MySf, FldId, NewGrd, GrdHd, GrdDataType, cback);
break;
case ShpfileType.SHP_MULTIPOINT:
case ShpfileType.SHP_MULTIPOINTM:
case ShpfileType.SHP_MULTIPOINTZ:
flg = Multipoint2Grid(MySf, FldId, NewGrd, GrdHd, GrdDataType, cback);
break;
default:
reportError("The shapefile type " + SfType.ToString() + "is not supported.", cback);
NewGrd.Close();
MySf.Close();
flg = false;
break;
}
//save and close the grid, close shapefile
NewGrd.Save(GrdName, GrdFileType, cback);
NewGrd.Close();
MySf.Close();
return flg;
}
