/// <summary>
/// Calculates the unique colors as a scheme
/// </summary>
/// <param name="fs">The featureset with the data Table definition</param>
/// <param name="uniqueField">The unique field</param>
public Hashtable GenerateUniqueColors(IFeatureSet fs, string uniqueField)
{
Hashtable result = new Hashtable(); // a hashtable of colors
DataTable dt = fs.DataTable;
ArrayList vals = new ArrayList();
int i = 0;
foreach (DataRow row in dt.Rows)
{
if (uniqueField != "FID")
{
if (vals.Contains(row[uniqueField]) == false)
{
vals.Add(row[uniqueField]);
}
}
else
{
vals.Add(i);
i++;
}
}
Random rnd = new Random();
foreach (object item in vals)
{
Color c = rnd.NextColor();
while(result.ContainsKey(c))
{
c = rnd.NextColor();
}
PolygonCategory cat = new PolygonCategory(c, c, 1);
string flt = "[" + uniqueField + "] = ";
if (uniqueField == "FID")
{
flt += item;
}
else
{
if (dt.Columns[uniqueField].DataType == typeof(string))
{
flt += "'" + item + "'";
}
else
{
flt += item.ToString();
}
}
cat.FilterExpression = flt;
Categories.Add(cat);
result.Add(c, item);
}
return result;
}
/// <summary>
/// Creates the category using a random fill color
/// </summary>
/// <param name="fillColor">The base color to use for creating the category</param>
/// <param name="size">This is ignored for polygons</param>
/// <returns>A new polygon category</returns>
public override ICategory CreateNewCategory(Color fillColor, double size)
{
PolygonCategory result = new PolygonCategory();
if (EditorSettings.UseGradient)
{
result.Symbolizer = new PolygonSymbolizer(fillColor.Lighter(.2f), fillColor.Darker(.2f), EditorSettings.GradientAngle,
GradientTypes.Linear, fillColor.Darker(.5f), 1);
}
else
{
if(EditorSettings.TemplateSymbolizer != null)
{
result.Symbolizer = EditorSettings.TemplateSymbolizer.Copy() as IPolygonSymbolizer;
result.SetColor(fillColor);
}
else
{
result.Symbolizer = new PolygonSymbolizer(fillColor, fillColor.Darker(.5f));
}
}
return result;
}
/// <summary>
/// Uses the settings on this scheme to create a random category.
/// </summary>
/// <returns>A new IFeatureCategory</returns>
public override IFeatureCategory CreateRandomCategory(string filterExpression)
{
PolygonCategory result = new PolygonCategory();
Color fillColor = CreateRandomColor();
if (EditorSettings.UseGradient)
{
result.Symbolizer = new PolygonSymbolizer(fillColor.Lighter(.2f), fillColor.Darker(.2f), EditorSettings.GradientAngle,
GradientTypes.Linear, fillColor.Darker(.5f), 1);
}
else
{
result.Symbolizer = new PolygonSymbolizer(fillColor, fillColor.Darker(.5f));
}
result.FilterExpression = filterExpression;
result.LegendText = filterExpression;
return result;
}
/// <summary>
/// creates a new instance of the PointScheme, but assigns the specified symbolizer
/// as the symbolizer to use on a single default category.
/// </summary>
/// <param name="extent">The geographic point size for the default will be 1/100th the specified extent</param>
public PolygonScheme(IEnvelope extent)
{
Configure();
PolygonCategory def = new PolygonCategory(extent);
Categories.Add(def);
}
