protected override IEnumerable <TRenderObject> DoRenderFeature(IFeatureDataRecord feature,
GeoJsonGeometryStyle style,
RenderState state,
ILayer layer)
{
if (feature == null)
{
throw new ArgumentNullException("feature");
}
if (style == null)
{
throw new ArgumentNullException("style");
}
if (feature.Geometry == null)
{
throw new InvalidOperationException("Feature must have a geometry to be rendered.");
}
StringBuilder sb = new StringBuilder();
GeoJsonFeatureWriter.WriteFeature(sb, style, feature);
yield return((TRenderObject)(object)(new GeoJsonRenderObject(sb.ToString())));
/* oh dear - i feel very dirty now */
}
protected override IEnumerable <GeoJsonRenderObject> DoRenderFeature(IFeatureDataRecord feature,
GeoJsonLabelStyle style,
RenderState state, ILayer layer)
{
FeatureDataRow fdr = (FeatureDataRow)feature;
string text = fdr.Evaluate(style.LabelExpression);
StringBuilder sb = new StringBuilder();
sb.Append("{");
sb.Append(JsonUtility.FormatJsonAttribute("type", "Label"));
sb.Append(",");
sb.Append(JsonUtility.FormatJsonAttribute("id", feature.GetOid()));
sb.Append(",");
sb.Append(JsonUtility.FormatJsonAttribute("text", text));
sb.Append(",");
IGeometry geom;
if (style.IncludeGeometryData)
{
geom = style.PreProcessGeometries
? style.GeometryPreProcessor(feature.Geometry)
: feature.Geometry;
}
else
{
geom = feature.Geometry.Centroid;
}
sb.Append("\"shape\":");
GeoJsonFeatureWriter.WriteGeometry(sb, geom, style.CoordinateNumberFormatString);
sb.Append("}");
yield return(new GeoJsonRenderObject(sb.ToString()));
}
