Maps - Add Zoom and Pan / Eric Field

Building and Using Tools to See. UVA Architecture + Data Science. IT Director. Instructor.

Public

Edited

Apr 3, 2022

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</svg>

map = d3.select(mapContainer)

import {getMapData, drawMapLayer} from "@emfielduva/dvlib_maps"

world = getMapData("world110m")

usstates = FileAttachment("gz_2010_us_states_00_20m.json").json()

cville_neighborhoods = getMapData("https://opendata.arcgis.com/datasets/c371ad0b81024822bad1147ff6bb24c4_51.geojson")

mapLayers = {

let mapLayers = [];

mapLayers["countries"] = drawMapLayer(map,"countries",world.features,world.idField);

mapLayers["usstates"] = drawMapLayer(map,"usstates",usstates.features,"properties.NAME");

mapLayers["cville_neighborhoods"] = drawMapLayer(map,"cville_neighborhoods",cville_neighborhoods.features,"properties.NAME");

mapLayers["countries"].on("click", zoomToBounds); // this is added here to enable zooming to a clicked feature element.

mapLayers["usstates"].on("click", zoomToBounds);

return mapLayers;

}

<style>

#countries path {fill: #eeeeee; stroke: #ccc}

#usstates path {fill: #bbb; stroke: #aaa; opacity: 0.5;}

#cville_neighborhoods {fill: none; stroke: #333}

</style>

import {zoomed, zoomToBounds} with {map} from "@emfielduva/dvlib_maps"

map.call(d3.zoom()

.scaleExtent([1,1000]) //how far to be able zoom out,in

.on("zoom", zoomed));

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