inst/htmlwidgets/lib/leaflet/r-tree-README.md

In gisma/uavRmp: UAV Mission Planner

rTree

A non-recursive R-Tree library in pure JavaScript with no dependencies. Fork of Jon-Carlos Rivera's fantastic library which sadly seems not to be maintained. MIT Licensed.

So far:

• Bug fix when deleting points.
• Common.js module.
• Updated tests.
• Factory function for constructor.
• Method for dealing with GeoJSON.
• All methods now accept callbacks.
• Query by bbox instead of rectangle.
• Submit to NPM.
• Update examples.
• add closure
• add GruntFile
• fix syntax (make it pass jslint)
• more modular
• that bug with deleting

API

• RTree ( [ Number max_node_width, Function callback ] )

Parameters:

• max_node_width : optional : The maximum width of a node before a split is performed1.

Returns:

• An empty rTree object.

Usage:

• Make a new rTree with a max node width of 10:
• var myRTree = RTree(10);

rTree.insert

• rTree.insert ( Rectangle3 bounds, Object element)

Parameters:

• bounds : required : A minimally bounding box for element.
• element : required : An object to add to the R-Tree.

Returns:

• True.

Usage:

• Insert a 10x10 object that starts at position 10x10:
• myRTree.insert({x:10, y:10, w:10, h:10}, myObject);

rTree.remove

• rTree.remove ( Rectangle3 area _[, Object element)

Parameters:

• area : required : An area to search within.
• element : optional : An object to remove from the R-Tree. If no object is specified, all elements that touch area are deleted.

Returns:

• An array of leafs deleted from the R-Tree.

Usage:

• Deletes all object that touch the 10x10 rectangle starting at position 10x10:
• var myDelCount = myRTree.delete({x:10, y:10, w:10, h:10});
• Delete only specific object if it touches the 10x10 rectangle starting at position 10x10:
• var myDelCount = myRTree.delete({x:10, y:10, w:10, h:10}, specific_object);

rTree.geoJSON:

• rTree.geoJSON ( Object or Array geoJSON)

Parameters

• geoJSON : required : Either an Object representing a GeoJSON feature collection or an Array representing a list of GeoJSON features.

Usage:

myRTree.geoJSON({
    "type":"FeatureCollection",
    "features":[
        {
            "type":"Feature",
            "geometry":{
                "type":"Point",
                "coordinates":[100,1]
            },
            "properties":{
                "prop0":"value0"
            }
        },
        {
            "type":"Feature",
            "geometry":{
                "type":"LineString",
                "coordinates":[
                    [100,0],
                    [101,1]
                ]
            },
            "properties":{
                "prop0":"value0"
            }
        }
    ]
});

rTree.bbox:

• rTree.bbox ( Bounds area)

Parameters

• area : required : Area to search, this can either be represented by a single parameter bounds array [[x1,y1],[x2,y2]], two parameters representing the southwest and northeast corners [x1,y1],[x2,y2], or 4 parameters of [x1,y1,x2,y2].

Returns:

• An array of matched features.

Usage:

• Search a 10x10 area that starts at position 10x10 (these are all equivalent):
• var myObjects1 = myRTree.bbox([[10,10],[20,20]]);
• var myObjects2 = myRTree.bbox([[10,10],[20,20]]);
• var myObjects3 = myRTree.bbox([10,10],[20,20]);
• var myObjects4 = myRTree.bbox([10,10],[20,20]);
• var myObjects5 = myRTree.bbox(10,10,20,20);
• var myObjects6 = myRTree.bbox(10,10,20,20);

rTree.search

• RTree.search ( Rectangle3 area [, Boolean return node, Array return_array ])

Parameters:

• area : required : An area to search within.
• return node : optional : Whether to return the entire node, mainly internal option.
• return array : optional : An existing array to add the results to, defaults to [], mainly internal option.

Returns:

• An array of objects that overlap or touch area.

Usage:

• Search a 10x10 area that starts at position 10x10:
• var myObjects = myRTree.search({x:10, y:10, w:10, h:10});

Notes

1 Default max node width is currently 6.

3 A Rectangle is any object with public x, y, w, h properties. The object itself is not saved or used directly but copies are made of its x, y, w, h properties.

gisma/uavRmp documentation built on Sept. 12, 2023, 2:24 p.m.