I was trying out some label definitions in Android on a GraphicsOverlay
static final String labelPolygon = "{" +
"\"labelExpressionInfo\": {" + // Define a labeling expression that will show the address attribute value
"\"expression\": \"return $feature.geometryName;\"}," +
"\"labelPlacement\": \"esriServerPolygonPlacementAlwaysHorizontal\"," + // Align labels horizontally
"\"where\": \"$feature.geometryType='Polygon'\"}," +
"\"symbol\": {" + // Use a black bold text symbol
"\"color\": [0,0,0,255]," +
"\"haloColor\": [255,255,255,96]," +
"\"haloSize\": 2," +
"\"font\": {\"size\": 10}," +
"\"type\": \"esriTS\"}" +
"}";
static final String labelPolyline = "{" +
"\"labelExpressionInfo\": {" + // Define a labeling expression that will show the address attribute value
"\"expression\": \"return $feature.geometryName;\"}," +
"\"where\": \"$feature.geometryType='Polyline'\"}," +
"\"labelPlacement\": \"esriServerLinePlacementAboveAlong\"," + // Align labels horizontally
"\"symbol\": {" + // Use a black bold text symbol
"\"color\": [0,0,0,255]," +
"\"haloColor\": [255,255,255,96]," +
"\"haloSize\": 2," +
"\"font\": {\"size\": 10}," +
"\"type\": \"esriTS\"}" +
"}";
static final String labelPoint = "{" +
"\"labelExpressionInfo\": {" + // Define a labeling expression that will show the address attribute value
"\"expression\": \"return $feature.geometryName;\"}," +
"\"where\": \"$feature.geometryType='Point'\"}," +
"\"labelPlacement\": \"esriServerPointLabelPlacementBelowCenter\"," + // Align labels horizontally
"\"symbol\": {" + // Use a black bold text symbol
"\"color\": [0,0,0,255]," +
"\"haloColor\": [255,255,255,96]," +
"\"haloSize\": 2," +
"\"font\": {\"size\": 10}," +
"\"type\": \"esriTS\"}" +
"}";
I thought perhaps that since they have a rule for polygon, polyline, and point, that they would
That wasn't the case, and I got too many labels. I get one below and above a point symbol.
I tried adding "where" clause to restrict the polygon labels to polygons and so forth.
Then all labels dissappear.
I have found little to no guidance on what syntax should be followed in a where clause. I don't even know if it is SQL
or an Arcade Expression.
