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/* Copyright© 2000 - 2025 SuperMap Software Co.Ltd. All rights reserved.
* This program are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import L from 'leaflet';
import { Util as CommonUtil } from '@supermapgis/iclient-common/commontypes/Util';
import { LonLat } from '@supermapgis/iclient-common/commontypes/LonLat';
import { GeoJSON as GeoJSONFormat } from '@supermapgis/iclient-common/format/GeoJSON';
import { ServerFeature } from '@supermapgis/iclient-common/iServer/ServerFeature';
import { Vector } from '@supermapgis/iclient-common/commontypes/Vector';
import { Point as GeometryPoint } from '@supermapgis/iclient-common/commontypes/geometry/Point';
import { GeoText } from '@supermapgis/iclient-common/commontypes/geometry/GeoText';
import Attributions from '../core/Attributions';
/**
* @class HeatMapFeature
* @deprecatedclassinstance L.supermap.heatMapFeature
* @category Visualization HeatMap
* @classdesc 客户端热力图要素类。
* 支持的 geometry 参数类型为 {@link L.Point} 点对象、{@link L.LatLng} 经纬度点坐标对象、{@link L.CircleMarker} 圆形符号对象等。
* @modulecategory Overlay
* @extends {L.Class}
* @param {(L.Point|L.LatLng|L.CircleMarker)} geometry - 要素图形。
* @param {Object} attributes - 要素属性。
* @usage
*/
export var HeatMapFeature = L.Class.extend({
initialize: function (geometry, attributes) {
this.geometry = geometry;
this.attributes = attributes;
},
/**
* @function HeatMapFeature.prototype.toFeature
* @description 转为内部矢量要素。
* @returns {FeatureVector} 内部矢量要素。
*/
toFeature: function () {
var geometry = this.geometry;
var points = [];
if (geometry instanceof L.LatLng) {
points = [geometry.lng, geometry.lat];
} else if (geometry instanceof L.Point) {
points = [geometry.x, geometry.y];
} else if (geometry instanceof L.CircleMarker) {
var latLng = geometry.getLatLng();
points = [latLng.lng, latLng.lat];
} else {
points = geometry;
}
if (points.length === 2) {
geometry = new GeometryPoint(points[0], points[1]);
}
return new Vector(geometry, this.attributes);
}
});
export var heatMapFeature = function (geometry, attributes) {
return new HeatMapFeature(geometry, attributes);
};
/**
* @class HeatMapLayer
* @classdesc 热力图层类。热力图是通过颜色分布，描述诸如人群分布、密度和变化趋势等的一种地图表现手法。
* 热点图的衰减是像素级别的，视觉效果极佳，但不能与具体数据进行一一对应，只能表示权重之间的差别，
* 因此可以用于一些对精度要求不高而需要重点突出权重渐变的行业，如制作气象温度对比动态效果图、地震区域的震点强弱图等。<br>
* 在客户端直接渲染栅格图的三要素：<br>
* 1.热点数据，热点数据需要点数据，每一个热点数据需要有地理位置以及权重值 （能够明显地表现某位置某事件发生频率或事物分布密度等，如可以为温度的高低、人口密集度等等)；<br>
* 2.热点衰减渐变填充色集合， 用于渲染每一个热点从中心向外衰减时的渐变色；<br>
* 3.热点半径，也就是衰减半径。每一个热点需要从中心点外四周根据半径计算衰减度，对在热点衰减区内的每一个像素计算需要渲染的颜色值。
* @category Visualization HeatMap
* @param {string} name - 图层名称。
* @param {boolean} [loadWhileAnimating=true] - 是否实时重绘。（当绘制大数据量要素的情况下会出现卡顿，建议把该参数设为 false）。
* @param {Object} options - 构造参数。
* @param {L.Map} options.map - Leaflet Map 对象。
* @param {string} [options.id] - 专题图层 ID，默认使用 CommonUtil.createUniqueID("heatMapLayer_") 创建专题图层 ID。
* @param {boolean} [options.alwaysMapCRS=false] - 要素坐标是否和地图坐标系一致，要素默认是经纬度坐标。
* @param {string} [options.featureWeight] - 对应 feature 属性中的热点权重字段名称，权重值类型为 number。
* @param {number} [options.radius=50] - 热点渲染的最大半径（热点像素半径），单位为 px，当 useGeoUnit 参数 为 true 时，单位使用当前图层地理坐标单位。热点显示的时候以精确点为中心点开始往四周辐射衰减，其衰减半径和权重值成比列。
* @param {number} [options.opacity=1] - 图层不透明度。
* @param {Array.<string>} [options.colors=['blue', 'cyan', 'lime', 'yellow', 'red']] - 颜色线性渐变数组，颜色值必须为 canvas 所支持的。
* @param {boolean} [options.useGeoUnit=false] - 使用地理单位，即默认热点半径默认使用像素单位。当设置为 true 时，热点半径和图层地理坐标保持一致。
* @param {number} [options.blur] - 模糊量，单位为 px。默认值为半径的二分之一。
* @param {string} [options.attribution='Map Data <span>© <a href='http://support.supermap.com.cn/product/iServer.aspx' title='SuperMap iServer' target='_blank'>SuperMap iServer</a></span>'] - 版权描述信息。
*
* @extends {L.Layer}
* @fires HeatMapLayer#featuresremoved
* @fires HeatMapLayer#changelayer
* @usage
*/
export var HeatMapLayer = L.Layer.extend({
options: {
//要素坐标是否和地图坐标系一致，默认为false，要素默认是经纬度坐标。
alwaysMapCRS: false,
//热力图默认参数：
id: CommonUtil.createUniqueID("heatMapLayer_"),
featureWeight: null,
opacity: 1,
colors: ['blue', 'cyan', 'lime', 'yellow', 'red'],
useGeoUnit: false,
radius: 50,
attribution: Attributions.Common.attribution
},
initialize: function (name, options) {
L.Util.setOptions(this, options);
this.name = name;
this.features = [];
this.maxWeight = null;
this.minWeight = null;
this.rootCanvas = null;
this.canvasContext = null;
this.maxWidth = null;
this.maxHeight = null;
//热力图参数：
this.id = this.options.id;
/*
* options.featureWeight对应 feature 属性中的热点权重字段名称，权重值类型为float
* //例如：
* //feature.attributes中表示权重的字段为height,则在HeatMapLayer的featureWeight参数赋值为"height"
* feature1.attributes.height = 7.0;
* feature2.attributes.height = 6.0;
* var heatMapLayer = new HeatMapLayer("heatmaplayer",{"featureWeight":"height"});
* heatMapLayer.addFeatures([feature1,feature2]);
* @type {null}
*/
this.featureWeight = this.options.featureWeight;
this.colors = this.options.colors;
this.useGeoUnit = this.options.useGeoUnit;
this.opacity = this.options.opacity;
this.radius = this.options.radius;
this.blur = this.options.blur;
this.movingOffset = [0, 0];
},
/**
* @function HeatMapLayer.prototype.onRemove
* @description 删除某个地图。
* @param {L.Map} map - Leaflet Map 对象。
* @private
*/
onRemove: function (map) {
var me = this;
L.DomUtil.remove(me.rootCanvas);
map.off("mousemove", me.mouseMoveHandler);
},
/**
* @function HeatMapLayer.prototype.onAdd
* @description 添加专题图。
* @param {L.Map} map - Leaflet Map 对象。
* @private
*/
onAdd: function (map) {
var me = this;
me._map = map;
me._createCanvasContainer();
if (!me.rootCanvas) {
map.removeLayer(me);
return;
}
//初始化渲染器
var size = map.getSize();
me.rootCanvas.width = me.maxWidth = size.x;
me.rootCanvas.height = me.maxHeight = size.y;
me._updateOpacity();
me.mouseMoveHandler = function (e) {
var xy = e.layerPoint;
me.currentMousePosition = L.point(xy.x + me.movingOffset[0], xy.y + me.movingOffset[1]);
};
map.on("mousemove", me.mouseMoveHandler);
me.update();
},
/**
* @function HeatMapLayer.prototype.addFeatures
* @description 添加热点信息。
* @param {(GeoJSONObject|HeatMapFeature)} features - 待添加的要素数组。
*
* @example
* var geojson = {
* "type": "FeatureCollection",
* "features": [
* {
* "type": "feature",
* "geometry": {
* "type": "Point", //只支持point类型
* "coordinates": [0, 0]
* },
* "properties": {
* "height": Math.random()*9,
* "geoRadius": useGeoRadius?radius:null
* }
* }
* ]
* };
* var heatMapLayer = new HeatMapLayer("heatmaplayer",{"id":"heatmap"});
* heatMapLayer.addFeatures(geojson);
*/
addFeatures: function (features) {
this.features = this.toiClientFeature(features);
this.refresh();
},
/**
* @function HeatMapLayer.prototype.refresh
* @description 强制刷新当前热点显示，在图层热点数组发生变化后调用，更新显示。
*/
refresh: function () {
if (this.features.length === 0) {
return;
}
if (this._map) {
var extent = this._map.getBounds();
this.updateHeatPoints(extent);
}
},
/**
* @function HeatMapLayer.prototype.updateHeatPoints
* @description 刷新热点图显示。
* @param {L.LatLngBounds} bounds - 当前显示范围。
*/
updateHeatPoints: function (bounds) {
if (this.features && this.features.length > 0) {
this.convertFastToPixelPoints(bounds);
} else {
this.canvasContext.clearRect(0, 0, this.maxWidth, this.maxWidth);
}
},
/**
* @function HeatMapLayer.prototype.convertFastToPixelPoints
* @description 过滤位于当前显示范围内的热点，并转换其为当前分辨率下的像素坐标。
* @param {L.LatLngBounds} bounds - 当前显示范围。
* @private
*/
convertFastToPixelPoints: function (bounds) {
var data = [], x, y, k, resolution, maxTemp, minTemp, maxWeightTemp;
//获取当前像素下的地理范围
var dw = bounds.getEast() - bounds.getWest();
var dh = bounds.getNorth() - bounds.getSouth();
var mapCanvas = this._map.getSize();
if (dw / mapCanvas.x > dh / mapCanvas.y) {
resolution = dw / mapCanvas.x;
} else {
resolution = dh / mapCanvas.y;
}
//热点半径
this.useRadius = this.useGeoUnit ? parseInt(this.radius / resolution) : this.radius;
for (var i = 0; i < this.features.length; i++) {
var feature = this.features[i];
var point = feature.geometry;
var pixelPoint = this.getLocalXY(new LonLat(point.x, point.y));
if (this.featureWeight) {
pixelPoint.weight = feature.attributes[this.featureWeight];//point.value;
if (!this.maxWeight) {
//找出最大最小权重值
maxTemp = maxTemp ? maxTemp : pixelPoint.weight;
minTemp = minTemp ? minTemp : pixelPoint.weight;
maxTemp = Math.max(maxTemp, pixelPoint.weight);
minTemp = Math.min(minTemp, pixelPoint.weight);
}
} else {
pixelPoint.weight = 1;
}
x = Math.floor(pixelPoint[0]);
y = Math.floor(pixelPoint[1]);
k = pixelPoint.weight;
data.push([x, y, k]);
}
//无最大权重设置
if (!this.maxWeight) {
if (maxTemp && minTemp) {
maxWeightTemp = (maxTemp + minTemp) / 2;
} else {
maxWeightTemp = 1;
}
this.draw(data, maxWeightTemp);
} else {
this.draw(data, this.maxWeight);
}
},
/**
* @function HeatMapLayer.prototype.draw
* @description 绘制热点图。
* @param {Array} data - convertToPixelPoints 方法计算出的点。
* @param {number} maxWeight - 最大权重。
* @private
*/
draw: function (data, maxWeight) {
if (this.maxHeight > 0 && this.maxWidth > 0) {
var ctx = this.canvasContext;
//清空
this.canvasContext.clearRect(0, 0, this.maxWidth, this.maxHeight);
this.drawCircle(this.useRadius);
this.createGradient();
for (var i = 0; i < data.length; i++) {
var p = data[i];
this.canvasContext.globalAlpha = Math.max(p[2] / maxWeight, 0.05);
this.canvasContext.drawImage(this.circle, p[0] - this.useRadius, p[1] - this.useRadius);
}
var colored = ctx.getImageData(0, 0, this.maxWidth, this.maxHeight);
this.colorize(colored.data, this.grad);
ctx.putImageData(colored, 0, 0);
} else {
return false;
}
},
/**
* @function HeatMapLayer.prototype.colorize
* @description 根据渐变色重置热点图 rgb 值。
* @param {Array} pixels 像素 RGBA 值。
* @param {Array} gradient 渐变 canvas.getImageData.data。
* @private
*/
colorize: function (pixels, gradient) {
for (var i = 0, j; i < pixels.length; i += 4) {
j = pixels[i + 3] * 4;
if (j) {
pixels[i] = gradient[j];
pixels[i + 1] = gradient[j + 1];
pixels[i + 2] = gradient[j + 2];
}
}
},
/**
* @function HeatMapLayer.drawCircle
* @description 绘制热点半径圆。
* @param {number} r - 热点半径。
* @private
*/
drawCircle: function (r) {
var blur = this.blur || r / 2;
var circle = this.circle = document.createElement('canvas'),
ctx = circle.getContext("2d");
circle.height = 2 * r;
circle.width = 2 * r;
ctx.shadowOffsetX = ctx.shadowOffsetY = 2 * r;
ctx.shadowBlur = blur;
ctx.shadowColor = "#000000";
ctx.beginPath();
ctx.arc(-r, -r, r / 2, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
},
/**
* @function HeatMapLayer.createGradient
* @description 根据 this.canvasColors 设置渐变并 getImageData。
* @private
*/
createGradient: function () {
var colors = this.colors;
var canvas = document.createElement('canvas'),
ctx = canvas.getContext("2d"),
gradient = ctx.createLinearGradient(0, 0, 0, 256);
canvas.height = 256;
canvas.width = 1;
var index = 1;
for (var i = 0, len = colors.length; i < len; i++) {
gradient.addColorStop(index / len, colors[i]);
index++;
}
ctx.fillStyle = gradient;
ctx.fillRect(0, 0, 1, 256);
this.grad = ctx.getImageData(0, 0, 1, 256).data;
},
/**
* @function HeatMapLayer.prototype.update
* @description 更新图层。
*/
update: function () {
var mapOffset = this._map.containerPointToLayerPoint([0, 0]);
L.DomUtil.setPosition(this.rootCanvas, mapOffset);
var me = this;
me.refresh();
if (me.currentMousePosition) {
me.currentMousePosition = L.point(
me.currentMousePosition.x - me.movingOffset[0],
me.currentMousePosition.y - me.movingOffset[1]);
}
me.movingOffset = [0, 0];
me._zoom = me._map.getZoom();
me._center = me._map.getCenter();
},
/**
* @function HeatMapLayer.prototype.getLocalXY
* @description 地理坐标转为像素坐标。
* @param {Array} coordinate - 地理坐标。
*/
getLocalXY: function (coordinate) {
if (!this._map) {
return coordinate;
}
var coor = coordinate;
if (L.Util.isArray(coordinate)) {
coor = L.point(coordinate[0], coordinate[1]);
}
if (!(coordinate instanceof L.Point)) {
if (coordinate instanceof GeometryPoint || coordinate instanceof GeoText) {
coor = L.point(coordinate.x, coordinate.y);
} else {
coor = L.point(coordinate.lon, coordinate.lat);
}
}
var point = this._map.latLngToContainerPoint(!this.options.alwaysMapCRS ? L.latLng(coor.y, coor.x) : this._map.options.crs.unproject(coor));
return [point.x, point.y];
},
/**
* @function HeatMapLayer.prototype.setOpacity
* @description 设置图层的不透明度，取值范围：[0-1]。
* @param {number} opacity - 不透明度。
*/
setOpacity: function (opacity) {
var me = this;
if (opacity === me.options.opacity) {
return;
}
if (opacity) {
me.options.opacity = opacity;
}
me._updateOpacity();
},
/**
* @function HeatMapLayer.prototype.removeFeatures
* @description 移除指定的热点信息。
* @param {Array.<FeatureVector>} features - 热点信息数组。
*/
removeFeatures: function (features) {
if (!features || features.length === 0 || !this.features || this.features.length === 0) {
return;
}
if (features === this.features) {
return this.removeAllFeatures();
}
if (!(CommonUtil.isArray(features))) {
features = [features];
}
var heatPoint, index, heatPointsFailedRemoved = [];
for (var i = 0, len = features.length; i < len; i++) {
heatPoint = features[i];
index = CommonUtil.indexOf(this.features, heatPoint);
//找不到视为删除失败
if (index === -1) {
heatPointsFailedRemoved.push(heatPoint);
continue;
}
//删除热点
this.features.splice(index, 1);
}
var succeed = heatPointsFailedRemoved.length == 0 ? true : false;
//派发删除features成功的事件
/**
* @event HeatMapLayer#featuresremoved
* @description 删除features成功后触发。
* @property {Array.<FeatureVector>} features - 事件对象。
* @property {boolean} succeed - 删除是否成功，false 为失败，true 为成功。
*/
this._map.fire("featuresremoved", {features: heatPointsFailedRemoved, succeed: succeed});
this.refresh();
},
/**
* @function HeatMapLayer.prototype.removeAllFeatures
* @description 移除全部的热点信息。
*/
removeAllFeatures: function () {
this.features = [];
this.refresh();
},
/**
* @function HeatMapLayer.prototype._createCanvasContainer
* @description 创建热力图绘制容器。
* @private
*/
_createCanvasContainer: function () {
//构建绘图面板
var parentContainer = this.getPane();
var animated = this._map.options.zoomAnimation && L.Browser.any3d;
var className = 'heatMapLayer leaflet-layer leaflet-zoom-' + (animated ? 'animated' : 'hide');
this.rootCanvas = L.DomUtil.create("canvas", className, parentContainer);
var originProp = L.DomUtil.testProp(['transformOrigin', 'WebkitTransformOrigin', 'msTransformOrigin']);
this.rootCanvas.id = this.id;
this.rootCanvas.style[originProp] = '50% 50%';
this.rootCanvas.style.position = "absolute";
this.rootCanvas.style.zIndex = 200;
CommonUtil.modifyDOMElement(this.rootCanvas, null, null, null,
null, null, null, this.opacity);
this.canvasContext = this.rootCanvas.getContext('2d');
},
_updateOpacity: function () {
var me = this;
CommonUtil.modifyDOMElement(me.rootCanvas, null, null, null, null, null, null, me.options.opacity);
if (me._map !== null) {
/**
* @event HeatMapLayer#changelayer
* @description 图层透明度更新成功之后触发。
* @property {HeatMapLayer} layer - 图层。
* @property {string} property - 改变的图层属性。
*/
me._map.fire("changelayer", {layer: me, property: "opacity"});
}
},
/**
* @function HeatMapLayer.prototype.getEvents
* @description 获取图层事件。
* @returns {Object} 返回图层支持的事件。
* @private
*/
getEvents: function () {
var me = this;
var events = {
zoomend: me._reset,
moveend: me._reset,
resize: me._resize
};
if (this._map._zoomAnimated) {
events.zoomanim = me._zoomAnim;
}
return events;
},
/**
* @function HeatMapLayer.prototype.toiClientFeature
* @description 转为 iClient 要素。
* @param {(GeoJSONObject|HeatMapFeature)} features - 待添加的要素数组。
* @returns {FeatureVector} 转换后的 iClient 要素。
*/
toiClientFeature: function (features) {
if (!L.Util.isArray(features)) {
features = [features];
}
let featuresTemp = [];
for (let i = 0, len = features.length; i < len; i++) {
//支持ThemeFeature类型的feature
//支持传入ThemeFeature类型,ThemeFeature.geometry instanceof L.LatLng | ThemeFeature.geometry instanceof L.Point
if (features[i] instanceof HeatMapFeature) {
featuresTemp.push(features[i].toFeature());
} else if (["FeatureCollection", "Feature", "Geometry"].indexOf(features[i].type) != -1) {
const format = new GeoJSONFormat();
featuresTemp = featuresTemp.concat(format.read(features[i]));
} else if (features[i].geometry && features[i].geometry.parts) {
//iServer服务器返回数据格式 todo 暂未找到更好的参数判断，暂用 geometry.parts 试用
featuresTemp.push(ServerFeature.fromJson(features[i]).toFeature());
} else {
throw new Error("Features's type does not match, please check.");
}
}
return featuresTemp;
},
_zoomAnim: function (e) {
var scale = this._map.getZoomScale(e.zoom),
offset = this._map._getCenterOffset(e.center)._multiplyBy(-scale).subtract(this._map._getMapPanePos());
if (L.DomUtil.setTransform) {
L.DomUtil.setTransform(this.rootCanvas, offset, scale);
} else {
this.rootCanvas.style[L.DomUtil.TRANSFORM] = L.DomUtil.getTranslateString(offset) + ' scale(' + scale + ')';
}
},
//缩放移动重绘
_reset: function () {
var me = this;
me.update();
var size = me._map.getSize();
var mapOffset = this._map.containerPointToLayerPoint([0, 0]);
L.DomUtil.setPosition(this.rootCanvas, mapOffset);
if (parseFloat(me.rootCanvas.width) !== parseFloat(size.x)) {
me.rootCanvas.width = size.x;
}
if (parseFloat(me.rootCanvas.height) !== parseFloat(size.y)) {
me.rootCanvas.height = size.y;
}
me.refresh();
},
//通知渲染器的尺寸变化
_resize: function () {
var me = this;
var newSize = me._map.getSize();
me.maxWidth = newSize.x;
me.maxHeight = newSize.y;
}
});
export var heatMapLayer = function (name, options) {
return new HeatMapLayer(name, options);
};