/// <summary>
/// Intersect minor grids with the currently selected land shapefile. Returns true if current land shape contains minor grid
/// </summary>
private static bool GetMinorGridsWithinLand()
{
var objSelected = new object();
var ifldInland = MinorGridsShapefile.FieldIndexByName["inland"];
//this operation selects those minor grids within the selected land shape.
MinorGridsShapefile.SelectByShapefile(LandShapefile, tkSpatialRelation.srWithin, true, ref objSelected);
try
{
_withinMinorGrids = (int[])objSelected;
for (int n = 0; n < _withinMinorGrids.Length; n++)
{
MinorGridsShapefile.EditCellValue(ifldInland, _withinMinorGrids[n], true);
MinorGridsShapefile.ShapeSelected[_withinMinorGrids[n]] = true;
}
if (StatusUpdate != null)
{
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Inland grids created";
e.GridCount = _withinMinorGrids.Length;
StatusUpdate(e);
}
return(true);
}
catch (Exception ex)
{
Logger.Log(ex.Message, "CreateInlandPointDatabase.cs", "GetMinorGridsWithinLand");
return(false);
}
}
/// <summary>
/// Intersects all land area shapes with grid25 major grids
/// </summary>
private static void ListIntersectLandArea()
{
if (SetUpMInorGridShapefile())
{
//enumerate all shapes in the land shapefile
for (int n = 0; n < LandShapefile.NumShapes; n++)
{
//make sure there are no selections
LandShapefile.SelectNone();
//select one shape
LandShapefile.ShapeSelected[n] = true;
//do the intersection, with the intersection result saved in the objSelected array
var objSelected = new object();
Grid25Shapefile.SelectByShapefile(LandShapefile, tkSpatialRelation.srIntersects, SelectedOnly: true, ref objSelected);
_intersectedMajorGrids = (int[])objSelected;
//raise event
if (StatusUpdate != null)
{
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Major grids intersected";
e.GridCount = _intersectedMajorGrids.Length;
StatusUpdate(e);
}
PopulateMinorGrid();
if (GetMinorGridsWithinLand())
{
ProcessInlandGrids();
}
}
}
}
private void OnStatusUpdate(CreateInlandGridEventArgs e)
{
Invoke((MethodInvoker)(() =>
{
txtStatus.Text = $"{e.Status}: {e.GridCount}\r\n{txtStatus.Text}";
if (e.StatusDescription != null && e.StatusDescription.Length > 0)
{
txtStatus.Text = $"{e.StatusDescription}\r\n{txtStatus.Text}";
}
}));
}
/// <summary>
/// Start the process of creating a database of inland minor grids
/// </summary>
public static bool Start()
{
bool success = false;
if (LandShapefile?.ShapefileType == ShpfileType.SHP_POLYGON &&
Grid25Shapefile?.ShapefileType == ShpfileType.SHP_POLYGON &&
FileName.Length > 0)
{
var proceed = true;
if (StatusUpdate != null)
{
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Point creation started";
e.StatusDescription = DateTime.Now.ToShortTimeString();
StatusUpdate(e);
}
proceed = CheckandCreateTable(FileName);
if (proceed)
{
if (LandShapefile.NumSelected > 0)
{
ListIntersectSelectedLandArea();
}
else
{
ListIntersectLandArea();
}
UpdateDatabase();
global.MappingForm.MapLayersHandler.AddLayer(_inlandMinorGrids, "Inland grids", true, true);
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Point creation finished";
e.StatusDescription = DateTime.Now.ToShortTimeString();
StatusUpdate(e);
success = true;
}
}
return(success);
}
/// <summary>
/// Intersects selected land shapes with grid25 major grid shapefiles
/// </summary>
private static void ListIntersectSelectedLandArea()
{
if (LandShapefile.NumSelected > 0 && SetUpMInorGridShapefile())
{
//get the selected shape indexes
var selectedShapesIndexes = MapInterActionHandler.SelectedShapeIndexes;
//enumerate all selected shapes
for (int n = 0; n < selectedShapesIndexes.Length; n++)
{
//clear all selections
LandShapefile.SelectNone();
//select one shape in the selected shapes
LandShapefile.ShapeSelected[selectedShapesIndexes[n]] = true;
//intersect the selected shape with the major grid
var objSelected = new object();
Grid25Shapefile.SelectByShapefile(LandShapefile, tkSpatialRelation.srIntersects, true, ref objSelected);
_intersectedMajorGrids = (int[])objSelected;
if (StatusUpdate != null)
{
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Major grids intersected";
e.GridCount = _intersectedMajorGrids.Length;
StatusUpdate(e);
}
PopulateMinorGrid();
if (GetMinorGridsWithinLand())
{
ProcessInlandGrids();
}
}
}
}
/// <summary>
/// Creates minor grid cells inside major grids intersected with land shapefiles
/// </summary>
private static void PopulateMinorGrid()
{
MinorGridsShapefile.EditClear();
FishingGrid.UTMZone = UTMZone;
int ifldGridNo = Grid25Shapefile.FieldIndexByName["grid_no"];
var gridNumber = 0;
//enumerate all intersected major grids
for (int n = 0; n < _intersectedMajorGrids.Length; n++)
{
gridNumber = (int)Grid25Shapefile.CellValue[Grid25Shapefile.FieldIndexByName["grid_no"], _intersectedMajorGrids[n]];
//get the origin of the current major grid
var origin = FishingGrid.MajorGridOrigin(gridNumber);
//build a minor grid, a point at a time. Here we will be creating 5 points, one point for each corner of the grid.
//The 5th point is needed to close the polygon.
for (int row = 25; row > 0; row--)
{
for (int col = 0; col < 25; col++)
{
var shp = new Shape();
if (shp.Create(ShpfileType.SHP_POLYGON))
{
for (int pt = 0; pt < 5; pt++)
{
switch (pt)
{
case 0:
case 4:
shp.AddPoint(origin.x + (col * 2000), origin.y + ((25 - row) * 2000));
break;
case 1:
shp.AddPoint(origin.x + (col * 2000) + 2000, origin.y + ((25 - row) * 2000));
break;
case 2:
shp.AddPoint(origin.x + (col * 2000) + 2000, origin.y + ((25 - row) * 2000) + 2000);
break;
case 3:
shp.AddPoint(origin.x + (col * 2000), origin.y + ((25 - row) * 2000) + 2000);
break;
}
}
//add the new shape to the shapefile. iShp is the index of the newest added shape
var iShp = MinorGridsShapefile.EditAddShape(shp);
//a new shape will have an index (iShp) of zero or greater
if (iShp >= 0)
{
//name the cell
MinorGridsShapefile.EditCellValue(_iFldName, iShp, $"{gridNumber.ToString()}-{(char)('A' + col)}{row}");
//set the inland attribute to false
MinorGridsShapefile.EditCellValue(_iFldInland, iShp, false);
}
}
}
}
}
//raise the event that minor grids were created
if (StatusUpdate != null)
{
CreateInlandGridEventArgs e = new CreateInlandGridEventArgs();
e.Status = "Minor grids created";
e.GridCount = MinorGridsShapefile.NumShapes;
StatusUpdate(e);
}
}
