protected override List <ShapeFile> CreateMapLayers(HttpContext context)
{
List <ShapeFile> layers = new List <ShapeFile>();
//load the shapefiles
string shapeFilePath = context.Server.MapPath("/demos/us_demo_files/counties.shp");
ShapeFile sf = new ShapeFile(shapeFilePath);
//set the field name used to label the shapes
sf.RenderSettings.FieldName = "NAME";
sf.RenderSettings.CustomRenderSettings = CreatePopulationRenderSettings(sf);
layers.Add(sf);
//set some CustomRenderSettings depending on the render type selected by the user
int renderSettingsType = 0;
int.TryParse(context.Request["rendertype"], out renderSettingsType);
if (renderSettingsType == 0)
{
layers[0].RenderSettings.CustomRenderSettings = CreatePopulationRenderSettings(layers[0]);
}
else if (renderSettingsType == 1)
{
layers[0].RenderSettings.CustomRenderSettings = null;
}
else
{
layers[0].RenderSettings.CustomRenderSettings = CustomRenderSettingsUtil.CreateRandomColorCustomRenderSettings(layers[0].RenderSettings, 1);
}
return(layers);
}
private static ICustomRenderSettings CreatePopulationRenderSettings(ShapeFile sf)
{
Color[] populationColors = new Color[] { Color.FromArgb(255, 255, 128),
Color.FromArgb(220, 225, 65),
Color.FromArgb(255, 245, 0),
Color.FromArgb(255, 128, 0),
Color.FromArgb(255, 64, 0),
Color.FromArgb(255, 0, 0) };
//synchronize the creation. Another thread may be attempting to render
//the map or create a custom render settings and reading from the
//internal DBFReader is not thread safe
lock (EGIS.ShapeFileLib.ShapeFile.Sync)
{
return(CustomRenderSettingsUtil.CreateQuantileCustomRenderSettings(
sf.RenderSettings,
populationColors,
"POP90_SQMI"));
}
}
protected override List <ShapeFile> CreateMapLayers(HttpContext context)
{
List <ShapeFile> layers = new List <ShapeFile>();
//lock (EGIS.ShapeFileLib.ShapeFile.Sync)
{
//load the shapefiles
string shapeFilePath = context.Server.MapPath("/demos/us_demo_files/counties.shp");
ShapeFile sf = new ShapeFile(shapeFilePath);
//set the field name used to label the shapes
sf.RenderSettings.FieldName = "NAME";
sf.RenderSettings.CustomRenderSettings = CreatePopulationRenderSettings(sf);
layers.Add(sf);
if (context.Request["getshape"] == null)
{
//set some CustomRenderSettings depending on the render type selected by the user
int renderSettingsType = 0;
int.TryParse(context.Request["rendertype"], out renderSettingsType);
if (renderSettingsType == 0)
{
layers[0].RenderSettings.CustomRenderSettings = CreatePopulationRenderSettings(layers[0]);
}
else if (renderSettingsType == 2)
{
layers[0].RenderSettings.CustomRenderSettings = CustomRenderSettingsUtil.CreateRandomColorCustomRenderSettings(layers[0].RenderSettings, 1);
}
else if (renderSettingsType == 3)
{
layers[0].RenderSettings.CustomRenderSettings = null;
//here you could select some records based on an SQL query from another table or perhaps
//pass in some other parameter and determine what to select
//to keep this example simple we will just select the first 100 records
int numRecordstoSelect = Math.Min(100, layers[0].RecordCount);
for (int n = 0; n < numRecordstoSelect; ++n)
{
layers[0].SelectRecord(n, true);
}
}
else if (renderSettingsType == 4)
{
layers[0].RenderSettings.CustomRenderSettings = null;
//select records intersecting a circle
List <int> ind = new List <int>();
PointD centrePoint = new PointD(layers[0].Extent.Left + layers[0].Extent.Width / 2,
layers[0].Extent.Top + layers[0].Extent.Height / 2);
lock (ShapeFile.Sync) //shapefile not thread safe so need synchronise access. See Shapefile class description
{
layers[0].GetShapeIndiciesIntersectingCircle(ind, centrePoint, layers[0].Extent.Height / 4);
}
for (int n = 0; n < ind.Count; ++n)
{
layers[0].SelectRecord(ind[n], true);
}
}
else
{
//not using any custom render settings
layers[0].RenderSettings.CustomRenderSettings = null;
}
}
}
return(layers);
}
