// <summary>
// Split a shapefile into several ones according the values the specified attribute.
// </summary>
public void SplitByAttribute(AxMap axMap1, string dataPath)
{
axMap1.Projection = tkMapProjection.PROJECTION_NONE;
axMap1.GrabProjectionFromData = true;
string filename = dataPath + "natural.shp";
if (!File.Exists(filename))
{
MessageBox.Show("Couldn't file the file: " + filename);
}
else
{
Shapefile sf = new Shapefile();
sf.Open(filename, null);
int fieldIndex = sf.Table.FieldIndexByName["type"];
sf.Categories.Generate(fieldIndex, tkClassificationType.ctUniqueValues, 0);
sf.Categories.ApplyExpressions();
ColorScheme scheme = new ColorScheme();
scheme.SetColors2(tkMapColor.White, tkMapColor.Black);
for (int i = 0; i < sf.Categories.Count; i++)
{
Shapefile sfNew = sf.Clone();
int layerHandle = axMap1.AddLayer(sfNew, true);
for (int shapeIndex = 0; shapeIndex < sf.NumShapes; shapeIndex++)
{
if (sf.ShapeCategory[shapeIndex] == i)
{
Shape shape = sf.Shape[shapeIndex].Clone();
int index = sfNew.NumShapes;
sfNew.EditInsertShape(shape, ref index);
}
}
ShapefileCategory category = sf.Categories.Item[i];
string name = category.Name.Substring(category.Name.IndexOf("=") + 1);
uint color = scheme.get_RandomColor((i + 1) / sf.Categories.Count);
sfNew.DefaultDrawingOptions.FillColor = color;
axMap1.set_LayerName(layerHandle, name);
//sfNew.SaveAs(path + name + ".shp", null); // saves shapefile
}
ShowLegend();
axMap1.ZoomToMaxExtents();
axMap1.Redraw();
}
}
public IFeatureSet Clone()
{
var sf = _shapefile.Clone();
return(WrapShapefile(sf));
}
// <summary>
// Calculates the length of intersection of rivers and land parcels
// </summary>
public void IntersectionLength(AxMap axMap1, ToolStripStatusLabel label, string dataPath)
{
axMap1.Projection = tkMapProjection.PROJECTION_NONE;
axMap1.GrabProjectionFromData = true;
string filename1 = dataPath + "landuse.shp";
string filename2 = dataPath + "waterways.shp";
if (!File.Exists(filename1) || !File.Exists(filename2))
{
MessageBox.Show("The necessary files (waterways.shp, building.shp) are missing: " + dataPath);
}
else
{
Shapefile sfParcels = new Shapefile();
sfParcels.Open(filename1, null);
sfParcels.StartEditingShapes(true, null);
Field field = new Field {
Name = "Length", Type = FieldType.DOUBLE_FIELD, Precision = 10
};
int fieldIndex = sfParcels.NumShapes;
sfParcels.EditInsertField(field, ref fieldIndex, null);
Shapefile sfRivers = new Shapefile();
sfRivers.Open(filename2, null);
sfRivers.StartEditingShapes(true, null);
Utils utils = new Utils();
sfRivers.DefaultDrawingOptions.LineWidth = 2;
sfRivers.DefaultDrawingOptions.LineColor = utils.ColorByName(tkMapColor.Blue);
Shapefile sfNew = sfRivers.Clone();
ShapeDrawingOptions options = sfNew.DefaultDrawingOptions;
LinePattern pattern = new LinePattern();
pattern.AddLine(utils.ColorByName(tkMapColor.Blue), 8, tkDashStyle.dsSolid);
pattern.AddLine(utils.ColorByName(tkMapColor.LightBlue), 4, tkDashStyle.dsSolid);
options.LinePattern = pattern;
options.UseLinePattern = true;
for (int i = 0; i < sfParcels.NumShapes; i++)
{
Shape shp1 = sfParcels.Shape[i];
double length = 0.0; // the length of intersection
for (int j = 0; j < sfRivers.NumShapes; j++)
{
Shape shp2 = sfRivers.Shape[j];
if (shp1.Intersects(shp2))
{
Shape result = shp1.Clip(shp2, tkClipOperation.clIntersection);
if (result != null)
{
int index = sfNew.EditAddShape(result);
length += result.Length;
}
}
}
sfParcels.EditCellValue(fieldIndex, i, length);
label.Text = string.Format("Parcel: {0}/{1}", i + 1, sfParcels.NumShapes);
Application.DoEvents();
}
// generating charts
var chartField = new ChartField();
chartField.Name = "Length";
chartField.Color = utils.ColorByName(tkMapColor.LightBlue);
chartField.Index = fieldIndex;
sfParcels.Charts.AddField(chartField);
sfParcels.Charts.Generate(tkLabelPositioning.lpInteriorPoint);
sfParcels.Charts.ChartType = tkChartType.chtBarChart;
sfParcels.Charts.BarHeight = 100;
sfParcels.Charts.ValuesVisible = true;
sfParcels.Charts.Visible = true;
axMap1.AddLayer(sfParcels, true);
axMap1.AddLayer(sfRivers, true);
axMap1.AddLayer(sfNew, true);
axMap1.ZoomToMaxExtents();
}
}
