市区町村境界データをGeobufにコンバートし、リーフレットで表示するテスト。
pathの描画にはD3を使っている。
<!DOCTYPE html>
<html xmlns="//www.w3.org/1999/xhtml">
<head>
<title>Geobuf 市区町村境界データテスト</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css"/>
<style>
body {
margin: 0px;
}
#map {
position: absolute;
height: 100%;
width: 100%;
background-color: #698EA9;
}
#map .cityLayer path{
stroke:#323C5C;
fill:#96A082;
}
#map .prefLayer path{
stroke:#180D2E;
}
</style>
</head>
<body>
<script src="//cdnjs.cloudflare.com/ajax/libs/es6-promise/4.1.0/es6-promise.auto.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet-src.js"></script>
<script src="L.SvgScaleOverlay.js"></script>
<script src="pbf.js"></script>
<script src="geobuf.js"></script>
<div id="map"></div>
<script>
var pref, city;
var projectPoint = function(x, y) {
var point = map.latLngToLayerPoint(new L.LatLng(y, x));
this.stream.point(point.x, point.y);
};
var transform = d3.geoTransform({point: projectPoint});
var gen = d3.geoPath().projection(transform);
var drawFeature = function(layer, geojson) {
var path = layer.selectAll("path")
.data(geojson.features)
.enter()
.append("path")
.attr("d", gen)
;
return path;
};
var loadGeobuf = function(file, callback) {
var oReq = new XMLHttpRequest();
oReq.open("GET", file, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(oEvent) {
var pd = new Pbf(new Uint8Array(oReq.response));
callback(geobuf.decode(pd));
};
oReq.send();
};
var map = L.map("map", {
inertia:true,
maxZoom:12,
zoomAnimation:true,
zoomAnimationThreshold:8,
bounceAtZoomLimits:false
})
.fitBounds([[33.920720433634074,133.125608053125],[39.65659419948214,144.51843031875]]);
var svgOverlay = L.SvgScaleOverlay();
svgOverlay.onInitData = function () {
var g = d3.select(this._g).classed("viewer", true);
var cityLayer = g.append("g").classed("cityLayer", true);
var prefLayer = g.append("g").classed("prefLayer", true);
var p1 = new Promise(function(callback){
loadGeobuf("pref.buf", function(geojson){
var path = drawFeature(prefLayer, geojson);
path.attr("fill", "none")
.attr("stroke-width", 1);
callback({path:path, geojson:geojson});
});
});
var p2 = new Promise(function(callback){
loadGeobuf("city.buf", function(geojson){
var path = drawFeature(cityLayer, geojson);
path.attr("stroke-width", 0.5);
callback({path:path, geojson:geojson});
});
});
Promise.all([p1, p2]).then(function(values) {
pref = values[0].path;
city = values[1].path;
var update = function() {
pref.attr("d", gen);
city.attr("d", gen);
};
map.on("viewreset", update);
update();
});
};
svgOverlay.onScaleChange = function (scaleDiff) {
if(scaleDiff < 1) return ;
pref.attr("stroke-width", 1.5 / scaleDiff);
city.attr("stroke-width", 0.5 / scaleDiff);
};
map.addLayer(svgOverlay);
</script>
</body>
</html>
/*
Stanislav Sumbera, August , 2015
- scaled SVG draw prototype on top of Leaflet 1.0 beta
- note it uses L.map patch to get it working right
- SVG data are not modified, only scaled and optionaly radius/stroke width etc. can be specified on onScaleChange callback
- very experimental
*/
//-- Patch to get leaflet properly zoomed
L.Map.prototype.latLngToLayerPoint = function (latlng) { // (LatLng)
var projectedPoint = this.project(L.latLng(latlng));//._round();
return projectedPoint._subtract(this.getPixelOrigin());
};
L.Map.prototype._getNewPixelOrigin = function (center, zoom) {
var viewHalf = this.getSize()._divideBy(2);
return this.project(center, zoom)._subtract(viewHalf)._add(this._getMapPanePos());//._round();
};
// -- from leaflet 1.0 to get this working right on v 0.7 too
L.Map.prototype.getZoomScale = function (toZoom, fromZoom) {
var crs = this.options.crs;
fromZoom = fromZoom === undefined ? this._zoom : fromZoom;
return crs.scale(toZoom) / crs.scale(fromZoom);
};
L.SVGScaleOverlay = L.Class.extend({
options: {
pane: 'overlayPane',
nonBubblingEvents: [], // Array of events that should not be bubbled to DOM parents (like the map)
// how much to extend the clip area around the map view (relative to its size)
// e.g. 0.1 would be 10% of map view in each direction; defaults to clip with the map view
padding: 0
},
isLeafletVersion1: function () {
return L.Layer ? true : false;
},
initialize: function (options) {
L.setOptions(this, options);
L.stamp(this);
},
// ----------------------------------------------------------------------------------
getScaleDiff:function(zoom) {
var zoomDiff = this._groundZoom - zoom;
var scale = (zoomDiff < 0 ? Math.pow(2, Math.abs(zoomDiff)) : 1 / (Math.pow(2, zoomDiff)));
return scale;
},
initSvgContainer: function () {
var xmlns = "http://www.w3.org/2000/svg";
this._svg = document.createElementNS(xmlns, "svg");
this._g = document.createElementNS(xmlns, "g");
if (!this.isLeafletVersion1()) {
L.DomUtil.addClass(this._g, 'leaflet-zoom-hide');
}
var size = this._map.getSize();
this._svgSize = size;
this._svg.setAttribute('width', size.x);
this._svg.setAttribute('height', size.y);
this._svg.appendChild(this._g);
this._groundZoom = this._map.getZoom();
this._shift = new L.Point(0, 0);
this._lastZoom = this._map.getZoom();
var bounds = this._map.getBounds();
this._lastTopLeftlatLng = new L.LatLng(bounds.getNorth(), bounds.getWest()); ////this._initialTopLeft = this._map.layerPointToLatLng(this._lastLeftLayerPoint);
},
resize: function (e) {
var size = this._map.getSize();
this._svgSize = size;
this._svg.setAttribute('width', size.x);
this._svg.setAttribute('height', size.y);
},
moveEnd: function (e) {
var bounds = this._map.getBounds();
var topLeftLatLng = new L.LatLng(bounds.getNorth(), bounds.getWest());
var topLeftLayerPoint = this._map.latLngToLayerPoint(topLeftLatLng);
var lastLeftLayerPoint = this._map.latLngToLayerPoint(this._lastTopLeftlatLng);
var zoom = this._map.getZoom();
var scaleDelta = this._map.getZoomScale(zoom, this._lastZoom);
var scaleDiff = this.getScaleDiff(zoom);
if (this._lastZoom != zoom) {
if (typeof (this.onScaleChange) == 'function') {
this.onScaleChange(scaleDiff);
}
}
this._lastZoom = zoom;
var delta = lastLeftLayerPoint.subtract(topLeftLayerPoint);
this._lastTopLeftlatLng = topLeftLatLng;
L.DomUtil.setPosition(this._svg, topLeftLayerPoint);
this._shift._multiplyBy(scaleDelta)._add(delta);
this._g.setAttribute("transform", "translate(" + this._shift.x + "," + this._shift.y + ") scale(" + scaleDiff + ")"); // --we use viewBox instead
},
animateSvgZoom: function (e) {
var scale = this._map.getZoomScale(e.zoom, this._lastZoom),
offset = this._map._latLngToNewLayerPoint(this._lastTopLeftlatLng, e.zoom, e.center);
L.DomUtil.setTransform(this._svg, offset, scale);
},
getEvents: function () {
var events = {
resize: this.resize,
moveend: this.moveEnd
};
if (this._zoomAnimated && this.isLeafletVersion1()) {
events.zoomanim = this.animateSvgZoom;
}
return events;
},
/* from Layer , extension to get it worked on lf 1.0, this is not called on ,1. versions */
_layerAdd: function (e) { this.onAdd(e.target); },
/*end Layer */
onAdd: function (map) {
// -- from _layerAdd
// check in case layer gets added and then removed before the map is ready
if (!map.hasLayer(this)) { return; }
this._map = map;
this._zoomAnimated = map._zoomAnimated;
// --onAdd leaflet 1.0
if (!this._svg) {
this.initSvgContainer();
if (this._zoomAnimated) {
L.DomUtil.addClass(this._svg, 'leaflet-zoom-animated');
//L.DomUtil.addClass(this._svg, 'leaflet-zoom-hide');
}
}
var pane = this._map.getPanes().overlayPane;
pane.appendChild(this._svg);
if (typeof (this.onInitData) == 'function') {
this.onInitData();
}
//---------- from _layerAdd
if (this.getAttribution && this._map.attributionControl) {
this._map.attributionControl.addAttribution(this.getAttribution());
}
if (this.getEvents) {
map.on(this.getEvents(), this);
}
map.fire('layeradd', { layer: this });
},
onRemove: function () {
L.DomUtil.remove(this._svg);
}
});
L.SvgScaleOverlay = function (options) {
return new L.SVGScaleOverlay(options);
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