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ol-contours.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>contour</title>
<link href="./lib/openlayer/ol.css" rel="stylesheet" />
<style>
html,
body {
height: 100%;
width: 100%;
padding: 0px;
margin: 0px;
overflow: hidden;
}
#map {
height: 100%;
width: 100%;
}
#contour {
position: absolute;
z-index: 999;
top: 0px;
left: 0px;
opacity: 0.5;
}
</style>
</head>
<body>
<div id="map"></div>
</body>
<script src="lib/jqure1.7.min.js"></script>
<script src="lib/d3.v4.min.js"></script>
<script src="lib/d3-contour.v1.min.js"></script>
<script src="lib/dat.gui.min.js"></script>
<script src="lib/openlayer/ol-debug.js"></script>
<script>
/**
这是比较完整的ol-d3-contour版本
TODO
1.zoom大时，PXregion异常 | ok 左上角尚有小问题
2.等值线添加label
3.引入webworker 多线程计算 | 效果不明显，可能是方法的问题
4.idw插值算法优化的思路
（1）画布以（0，0）为起点 xmax => width, ymax => height | 这条好像行不通
1）直接在region的extent里计算
2）直接在region里插值计算（需要判断空间关系，范围内计算，范围外不计算）
（2）画布以（xmin, ymin) 为起点 xmax - xmin => width, ymax - ymin => height | 已通
3）region的extent(xmax - xmin, ymax - ymin)计算插值，然后canvas偏移至（xmin, ymin)
（3）基于idw算法函数优化 | Math函数优化,循环优化
*/
var mode = {};
mode.dataLoad = false;
mode.mapType = 'contour';
mode.heatmap_line = true;
mode.contour_isfull = true;
mode.drawpoint = false;
mode.drawlable = false;
mode.referenceValue = 85;
mode.mapAlpha = 0.4;
mode.mapThresholds = 10;
// GUI
var gui = new dat.GUI();
// 下拉框形式选择文案
gui.add(mode, 'dataLoad').onChange(function () {
if (!originData) {
AjaxGET()
}
});
gui.add(mode, 'mapType', ['heatmap', 'contour']).onChange(function () {
});
gui.add(mode, 'heatmap_line').onChange(function () {
});
gui.add(mode, 'contour_isfull').onChange(function () {
});
gui.add(mode, 'drawpoint').onChange(function () {
});
gui.add(mode, 'drawlable').onChange(function () {
});
gui.add(mode, 'referenceValue', 70, 100).onChange(function () {
});
gui.add(mode, 'mapAlpha', 0.1, 1.0).onChange(function () {
});
gui.add(mode, 'mapThresholds', 5, 20).onChange(function () {
});
var originData;
function AjaxGET() {
$.ajax({
type: "get",
url: "../data/getLcAQI.json",
dataType: "json",
success: function (json) {
originData = json.data;
CanvasLayerInit(originData);
}
});
}
let baseLayer = new ol.layer.Tile({
title: "base",
source: new ol.source.OSM()
});
var map = new ol.Map({
target: 'map',
layers: [baseLayer],
view: new ol.View({
center: [115.79, 36.142],
projection: 'EPSG:4326',
zoom: 8
})
});
map.on('click', (evt) => {
const px = map.getPixelFromCoordinate(evt.coordinate);
})
// 定义裁剪边界
var Regioncoord = [[116.05883026123047, 36.88069534301758], [116.12857055664074, 36.88832473754883], [116.16789245605469, 36.936771392822266], [116.20486450195324, 36.9648323059082], [116.23371124267578, 37.02350616455084], [116.30213165283214, 36.98831558227545], [116.32343292236328, 36.970138549804744], [116.43280029296886, 36.96689605712896], [116.45199584960938, 36.956863403320256], [116.45880126953125, 36.934246063232536], [116.42424011230469, 36.897548675537166], [116.4191665649414, 36.87055206298834], [116.38722229003918, 36.796733856201286], [116.39975738525402, 36.76072311401367], [116.38756561279308, 36.731239318847656], [116.40126800537132, 36.70432662963873], [116.40677642822266, 36.6568336486817], [116.39505004882824, 36.52444839477545], [116.44647979736351, 36.493713378906364], [116.45575714111328, 36.44969940185541], [116.49484252929688, 36.44376754760748], [116.54493713378918, 36.40079116821289], [116.50951385498047, 36.377944946289176], [116.47891998291027, 36.33679962158203], [116.44329071044933, 36.336921691894645], [116.32552337646484, 36.290496826171875], [116.27454376220703, 36.2218589782716], [116.20741271972656, 36.169773101806754], [116.16371154785156, 36.1711540222168], [116.15852355957043, 36.14592742919922], [116.1110076904298, 36.12730026245117], [116.09490203857422, 36.1111297607423], [116.05631256103516, 36.104995727539176], [116.01735687255871, 36.06333923339844], [115.92543792724621, 36.02585220336914], [115.89026641845703, 36.0249404907226], [115.85330963134777, 36.0066299438476], [115.80311584472656, 36.01005172729498], [115.74849700927734, 35.97412109375006], [115.68595886230469, 35.96349334716808], [115.65953826904308, 35.93789672851568], [115.64204406738281, 35.92935180664074], [115.58512115478538, 35.92505645751953], [115.5428695678711, 35.89764404296881], [115.50706481933594, 35.89407730102545], [115.44414520263672, 35.86289215087896], [115.39887237548828, 35.81025314331066], [115.35540771484375, 35.784446716308594], [115.33479309082031, 35.80162811279297], [115.33245086669933, 35.86394882202154], [115.36087036132824, 35.90924835205084], [115.34718322753906, 35.94689178466808], [115.35207366943371, 35.97102355957031], [115.43162536621105, 36.00341796875], [115.44813537597656, 36.075164794921875], [115.48091888427734, 36.126602172851506], [115.47286987304688, 36.16936111450207], [115.47711181640625, 36.2026824951173], [115.46441650390636, 36.257820129394474], [115.4229507446289, 36.28858184814453], [115.40888214111351, 36.32630920410156], [115.36056518554688, 36.308712005615234], [115.36262512207031, 36.342380523681754], [115.34253692626964, 36.38442230224621], [115.29388427734386, 36.41213226318354], [115.30603790283203, 36.43793106079113], [115.28143310546875, 36.47678756713873], [115.29291534423851, 36.520103454589844], [115.32230377197277, 36.54581069946295], [115.33660125732433, 36.61305999755865], [115.36998748779308, 36.63021469116222], [115.41259002685547, 36.683006286621094], [115.4307861328125, 36.68991088867193], [115.4688491821289, 36.74204254150402], [115.48047637939464, 36.76197052001953], [115.58241271972656, 36.779426574707145], [115.68394470214855, 36.81945800781256], [115.7004165649414, 36.87666702270502], [115.75374603271496, 36.915134429931754], [115.77561950683594, 36.909465789794865], [115.8946304321289, 36.905590057373104], [115.91487121582031, 36.89275741577154], [116.05883026123047, 36.88069534301758]];
// 色标卡
var colors = [
{ min: 0, max: 50, color: [0, 229, 0] },
{ min: 50, max: 100, color: [255, 255, 0] },
{ min: 100, max: 150, color: [255, 126, 0] },
{ min: 150, max: 200, color: [254, 0, 0] },
{ min: 200, max: 250, color: [152, 0, 75] },
{ min: 250, max: 300, color: [126, 1, 35] },
]
var contours, d3Path;
function CanvasLayerInit(_data) {
var canvasLayer = new ol.layer.Image({
source: new ol.source.ImageCanvas({
canvasFunction: (extent, resolution, pixelRatio, size, projection) => {
const [width, height] = size;
const [left, bottom, right, top] = extent;
const xscale = width / (right - left);
const yscale = height / (top - bottom);
const pxdata = getPxData(_data, xscale, yscale, top, left);
const pxregion = getPxRegion(Regioncoord, xscale, yscale, top, left);
const cw = Math.ceil(pxregion.xmax)
const ch = Math.ceil(pxregion.ymax)
const idwdata = olIDW(pxdata.data, cw, ch);
let canvas = document.createElement('canvas');
canvas.width = cw;
canvas.height = ch;
canvas.style.display = 'block';
//设置canvas透明度
canvas.getContext('2d').globalAlpha = 0.1;
context = canvas.getContext('2d');
contours = d3.contours().size([cw, ch]); //等高线绘图实例
d3Path = d3.geoPath(null, context); //绘图笔
context.clearRect(0, 0, cw, ch);
// 绘制裁剪区
context.beginPath()
for (let i = 0; i < pxregion.data.length; i++) {
const rp = pxregion.data[i]
context.lineTo(rp.x, rp.y)
}
context.closePath()
context.stroke()
context.clip()
context.globalAlpha = 0.3; //设置透明度
context.lineWidth = 2; //线条宽度
//绘图登高线图
contours
.thresholds(10)
(idwdata)
.forEach(fill);
//绘图一条等高线
function fill(geometry) {
context.beginPath();
d3Path(geometry);
console.log(geometry.value)
var acolor = getColor(colors, geometry.value);
//等高线梯度着色
context.fillStyle = acolor;
context.fill();
//等高线线条
context.strokeStyle = acolor;
context.stroke();
}
return canvas;
},
projection: 'EPSG:4326',
ratio: 1
})
})
//向map添加图层
map.addLayer(canvasLayer);
}
function getPxRegion(data, xscale, yscale, top, left) {
var _data = [];
var xmax = 0;
var ymax = 0;
var xmin = 9999;
var ymin = 9999;
for (var i = 0; i < data.length; i++) {
var p = coordToPoint(data[i][0], data[i][1], xscale, yscale, top, left)
if (i === 0) {
xmax = p[0];
ymax = p[1];
}
if (p[0] != 0 || p[1] != 0) {
xmax > p[0] ? null : xmax = p[0];
ymax > p[1] ? null : ymax = p[1];
xmin < p[0] ? null : xmin = p[0];
ymin < p[1] ? null : ymin = p[1];
_data.push({
x: p[0],
y: p[1]
})
}
}
return {
data: _data,
xmax: xmax,
ymax: ymax,
xmin: xmin,
ymin: ymin,
}
}
function getPxData(data, xscale, yscale, top, left) {
var _data = [];
var xmax = 0;
var ymax = 0;
var xmin = 9999;
var ymin = 9999;
for (var i = 0; i < data.length; i++) {
var p = coordToPoint(data[i].lon, data[i].lat, xscale, yscale, top, left)
if (i === 0) {
xmax = p[0];
ymax = p[1];
}
if (p[0] != 0 || p[1] != 0) {
xmax > p[0] ? null : xmax = p[0];
ymax > p[1] ? null : ymax = p[1];
xmin < p[0] ? null : xmin = p[0];
ymin < p[1] ? null : ymin = p[1];
_data.push({
x: p[0],
y: p[1],
value: Number(data[i].AQI)
})
}
}
// value一定要确保是number类型，否则在插值计算的会先string转number再计算，影响效率
return {
data: _data,
xmax: xmax,
ymax: ymax,
xmin: xmin,
ymin: ymin,
}
}
function coordToPoint(x, y, xscale, yscale, top, left) {
// var px = Math.abs(left - x) * xscale;
// var py = Math.abs(top - y) * yscale;
let px = (x - left) * xscale;
let py = (top - y) * yscale;
px > 0 ? null : px = 0;
py > 0 ? null : py = 0;
return [px, py]
}
function olIDW(data, width, height) {
var s = new Date().getTime();
var d = data;
//已有点初始二维数组
var dlen = d.length;
var matrixData = new Array(width * height);
// for (var i = 0; i < dlen; i++) {
// var point = d[i];
// matrixData[point.y * width + point.x] = point.value;
// }
/**
* 插值矩阵数据,时间复杂度O(height*width*len)
*/
var idwcount = 0
for (var i = 0, k1 = 0; i < height; i++) {
for (var j = 0; j < width; j++ , k1++) {
if (!matrixData[k1]) {
var sum0 = 0, sum1 = 0;
for (var k = 0; k < dlen; k++) {
var dk = d[k];
var dis = ((i - dk.y) * (i - dk.y) + (j - dk.x) * (j - dk.x));
sum0 = sum0 + dk.value * 1 / dis;
sum1 = sum1 + 1 / dis;
idwcount++
}
if (sum1 != 0)
//matrixData[k1] = sum0 / sum1 - referenceValue;
matrixData[k1] = sum0 / sum1;
else
matrixData[k1] = 1;
}
}
}
console.log(idwcount)
var e = new Date().getTime();
console.log('插值：' + (e - s) / 1000 + '秒');
return matrixData;
}
function getColor(colors, value) {
var len = colors.length;
for (var i = 0; i < len; i++) {
if (value > colors[i].min && value <= colors[i].max) return d3.rgb(colors[i].color[0], colors[i].color[1], colors[i].color[2]);
}
}
</script>
</html>