155 lines
4.5 KiB
JavaScript
155 lines
4.5 KiB
JavaScript
|
|
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing,
|
|
* software distributed under the License is distributed on an
|
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
* KIND, either express or implied. See the License for the
|
|
* specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
|
|
var zrUtil = require("zrender/lib/core/util");
|
|
|
|
var Region = require("./Region");
|
|
|
|
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing,
|
|
* software distributed under the License is distributed on an
|
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
* KIND, either express or implied. See the License for the
|
|
* specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
|
|
/**
|
|
* Parse and decode geo json
|
|
* @module echarts/coord/geo/parseGeoJson
|
|
*/
|
|
function decode(json) {
|
|
if (!json.UTF8Encoding) {
|
|
return json;
|
|
}
|
|
|
|
var encodeScale = json.UTF8Scale;
|
|
|
|
if (encodeScale == null) {
|
|
encodeScale = 1024;
|
|
}
|
|
|
|
var features = json.features;
|
|
|
|
for (var f = 0; f < features.length; f++) {
|
|
var feature = features[f];
|
|
var geometry = feature.geometry;
|
|
var coordinates = geometry.coordinates;
|
|
var encodeOffsets = geometry.encodeOffsets;
|
|
|
|
for (var c = 0; c < coordinates.length; c++) {
|
|
var coordinate = coordinates[c];
|
|
|
|
if (geometry.type === 'Polygon') {
|
|
coordinates[c] = decodePolygon(coordinate, encodeOffsets[c], encodeScale);
|
|
} else if (geometry.type === 'MultiPolygon') {
|
|
for (var c2 = 0; c2 < coordinate.length; c2++) {
|
|
var polygon = coordinate[c2];
|
|
coordinate[c2] = decodePolygon(polygon, encodeOffsets[c][c2], encodeScale);
|
|
}
|
|
}
|
|
}
|
|
} // Has been decoded
|
|
|
|
|
|
json.UTF8Encoding = false;
|
|
return json;
|
|
}
|
|
|
|
function decodePolygon(coordinate, encodeOffsets, encodeScale) {
|
|
var result = [];
|
|
var prevX = encodeOffsets[0];
|
|
var prevY = encodeOffsets[1];
|
|
|
|
for (var i = 0; i < coordinate.length; i += 2) {
|
|
var x = coordinate.charCodeAt(i) - 64;
|
|
var y = coordinate.charCodeAt(i + 1) - 64; // ZigZag decoding
|
|
|
|
x = x >> 1 ^ -(x & 1);
|
|
y = y >> 1 ^ -(y & 1); // Delta deocding
|
|
|
|
x += prevX;
|
|
y += prevY;
|
|
prevX = x;
|
|
prevY = y; // Dequantize
|
|
|
|
result.push([x / encodeScale, y / encodeScale]);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
/**
|
|
* @alias module:echarts/coord/geo/parseGeoJson
|
|
* @param {Object} geoJson
|
|
* @param {string} nameProperty
|
|
* @return {module:zrender/container/Group}
|
|
*/
|
|
|
|
|
|
function _default(geoJson, nameProperty) {
|
|
decode(geoJson);
|
|
return zrUtil.map(zrUtil.filter(geoJson.features, function (featureObj) {
|
|
// Output of mapshaper may have geometry null
|
|
return featureObj.geometry && featureObj.properties && featureObj.geometry.coordinates.length > 0;
|
|
}), function (featureObj) {
|
|
var properties = featureObj.properties;
|
|
var geo = featureObj.geometry;
|
|
var coordinates = geo.coordinates;
|
|
var geometries = [];
|
|
|
|
if (geo.type === 'Polygon') {
|
|
geometries.push({
|
|
type: 'polygon',
|
|
// According to the GeoJSON specification.
|
|
// First must be exterior, and the rest are all interior(holes).
|
|
exterior: coordinates[0],
|
|
interiors: coordinates.slice(1)
|
|
});
|
|
}
|
|
|
|
if (geo.type === 'MultiPolygon') {
|
|
zrUtil.each(coordinates, function (item) {
|
|
if (item[0]) {
|
|
geometries.push({
|
|
type: 'polygon',
|
|
exterior: item[0],
|
|
interiors: item.slice(1)
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
var region = new Region(properties[nameProperty || 'name'], geometries, properties.cp);
|
|
region.properties = properties;
|
|
return region;
|
|
});
|
|
}
|
|
|
|
module.exports = _default; |