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ol-contours-gxV3.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>
/**
* 1.这是未idw计算函数优化后的版本，
* 2.并且cnavas原点进行了偏移，
* 3.数组使用push的方式，详见https://www.jb51.net/article/61338.htm (但是实测效率提升不明显)
* 4.数组循环使用递减，最快1.1s
* 全部数据1690，计算次数520543660，耗时1.1-2.2秒
*/
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/getGxTEM.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: [108.22, 22.48],
projection: 'EPSG:4326',
zoom: 7
})
});
map.on('click', (evt) => {
const px = map.getPixelFromCoordinate(evt.coordinate);
})
// 定义裁剪边界
var Regioncoord = [
[112.018771, 24.742991],
[111.922317, 24.632471],
[112.052286, 24.389786],
[111.907721, 24.224724],
[111.935284, 23.99064],
[111.782283, 23.810257],
[111.481793, 23.629179],
[111.359452, 23.346328],
[111.353528, 22.891877],
[111.050612, 22.651229],
[110.745143, 22.560068],
[110.720781, 22.298481],
[110.499475, 22.145777],
[110.376498, 22.166857],
[110.386609, 21.952634],
[110.228064, 21.881519],
[109.941204, 21.847098],
[109.91003, 21.669518],
[109.745674, 21.591496],
[109.539086, 21.501962],
[109.15403, 21.403121],
[109.122942, 21.587646],
[108.792872, 21.635169],
[108.60476, 21.703956],
[108.393108, 21.553679],
[107.951241, 21.54183],
[107.856644, 21.654128],
[107.670284, 21.60483],
[107.384808, 21.598426],
[107.08438, 21.809196],
[107.06249, 21.897733],
[106.73693, 22.007554],
[106.660017, 22.334552],
[106.560223, 22.466608],
[106.70794, 22.579877],
[106.777117, 22.816929],
[106.605147, 22.927294],
[106.278289, 22.870475],
[106.202497, 22.985729],
[105.87158, 22.934157],
[105.541938, 23.193556],
[105.593011, 23.316427],
[105.864068, 23.534543],
[106.06837, 23.490039],
[106.193344, 23.839618],
[105.994917, 24.127046],
[105.838247, 24.033708],
[105.489794, 24.019978],
[105.22658, 24.168574],
[105.194475, 24.330613],
[105.047563, 24.444132],
[104.726227, 24.448855],
[104.519247, 24.538205],
[104.527261, 24.734426],
[104.62901, 24.663423],
[104.844471, 24.682999],
[105.030901, 24.790381],
[105.208045, 24.998223],
[105.443885, 24.919389],
[105.495992, 24.811707],
[105.762584, 24.723646],
[106.041005, 24.684321],
[106.167491, 24.761768],
[106.15812, 24.941302],
[106.434716, 25.021159],
[106.680148, 25.180254],
[106.894823, 25.194612],
[107.008447, 25.277277],
[106.959281, 25.440187],
[107.061434, 25.559848],
[107.314724, 25.506024],
[107.50047, 25.213561],
[107.75099, 25.241621],
[107.790364, 25.11902],
[108.135347, 25.238027],
[108.151225, 25.373298],
[108.327262, 25.538863],
[108.333191, 25.53823],
[108.41749, 25.443103],
[108.595029, 25.45789],
[108.757891, 25.640718],
[108.948369, 25.559414],
[108.946082, 25.734292],
[108.949757, 25.73391],
[108.954053, 25.734548],
[109.074594, 25.779999],
[109.292203, 25.717137],
[109.479632, 26.033639],
[109.781434, 25.992915],
[109.965848, 26.203308],
[110.059684, 26.045225],
[110.236062, 26.036341],
[110.546618, 26.236968],
[110.599353, 26.327283],
[110.794692, 26.27094],
[111.088237, 26.307829],
[111.277339, 26.27252],
[111.190019, 25.959266],
[111.378677, 25.884694],
[111.385872, 25.885442],
[111.302121, 25.720935],
[111.283031, 25.434527],
[111.097418, 25.285984],
[110.946744, 25.046674],
[110.987204, 24.960625],
[110.984792, 24.955197],
[110.989943, 24.93469],
[110.990291, 24.934372],
[110.990023, 24.933248],
[111.098564, 24.995761],
[111.098286, 24.99812],
[111.270769, 25.154386],
[111.468114, 25.015803],
[111.425673, 24.688552],
[111.567414, 24.648724],
[111.676845, 24.781188],
[112.018771, 24.742991]
]
// 色标卡
var colors = [
{ max: -30, color: '#020c64' },
{ min: -30, max: -28, color: '#071e78' },
{ min: -28, max: -26, color: '#11318b' },
{ min: -26, max: -24, color: '#1b449f' },
{ min: -24, max: -22, color: '#2657b3' },
{ min: -22, max: -20, color: '#306ac7' },
{ min: -20, max: -18, color: '#3b7edb' },
{ min: -20, max: -18, color: '#3b7edb' },
{ min: -18, max: -16, color: '#4e8add' },
{ min: -16, max: -14, color: '#6196e0' },
{ min: -14, max: -12, color: '#74a3e2' },
{ min: -12, max: -10, color: '#87afe5' },
{ min: -10, max: -8, color: '#9bbce8' },
{ min: -8, max: -6, color: '#9ac4dc' },
{ min: -6, max: -4, color: '#99cdd0' },
{ min: -4, max: -2, color: '#98d6c4' },
{ min: -2, max: 0, color: '#97e8ad' },
{ min: 0, max: 2, color: '#d7de7e' },
{ min: 2, max: 4, color: '#eadb70' },
{ min: 4, max: 6, color: '#f4d963' },
{ min: 6, max: 8, color: '#facc4f' },
{ min: 8, max: 10, color: '#f7b42d' },
{ min: 10, max: 12, color: '#f29b00' },
{ min: 12, max: 14, color: '#f19303' },
{ min: 14, max: 16, color: '#f0840a' },
{ min: 16, max: 18, color: '#ef7511' },
{ min: 18, max: 20, color: '#ee6618' },
{ min: 20, max: 22, color: '#ee581f' },
{ min: 22, max: 24, color: '#e74b1a' },
{ min: 24, max: 26, color: '#e03f16' },
{ min: 26, max: 28, color: '#d93312' },
{ min: 28, max: 30, color: '#d0240e' },
{ min: 30, max: 32, color: '#c20003' },
{ min: 32, max: 34, color: '#b50109' },
{ min: 34, max: 35, color: '#a90210' },
{ min: 35, max: 37, color: '#8a0519' },
{ min: 37, max: 40, color: '#6f0015' },
{ min: 40, color: '#6f0015' }
];
var contours, d3Path;
var context, contours, d3Path, cnavas;
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 pxregion = getPxRegion(Regioncoord, xscale, yscale, top, left);
const cw = Math.ceil(pxregion.xmax - pxregion.xmin)
const ch = Math.ceil(pxregion.ymax - pxregion.ymin)
// const cw = Math.ceil(pxregion.xmax)
// const ch = Math.ceil(pxregion.ymax)
const regionTopLeft = pointToCoord(pxregion.xmin, pxregion.ymin, xscale, yscale, top, left);
const _left = regionTopLeft[0];
const _top = regionTopLeft[1];
const regionBottomRight = pointToCoord(pxregion.xmax, pxregion.ymax, xscale, yscale, top, left);
const _right = regionBottomRight[0];
const _bottom = regionBottomRight[1];
// 这里是canvas分辨率
const _xscale = cw / (_right - _left);
const _yscale = ch / (_top - _bottom);
const pxdata = getPxData(_data, _xscale, _yscale, _top, _left);
let canvas = document.createElement('canvas');
canvas.width = Math.ceil(pxregion.xmax);
canvas.height = Math.ceil(pxregion.ymax);
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
// 偏移
context.translate(pxregion.xmin, pxregion.ymin);
const idwdata = olIDW(pxdata.data, cw, ch);
//绘图等高线图
contours
.thresholds(10)
(idwdata)
.forEach(fill);
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]
})
}
// 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].TEM)
})
}
// 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].TEM)
// })
}
// 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 pointToCoord(px, py, xscale, yscale, top, left) {
const x = (px / xscale) + left;
const y = top - (py / yscale);
return [x, y];
}
function coordToPoint(x, y, xscale, yscale, top, left) {
// var px = Math.abs(left - x) * xscale;
// var py = Math.abs(top - y) * yscale;
// 目的是为了剔除范围外的数据
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 = []
/**
* 插值矩阵数据,时间复杂度O(height*width*len)
*/
let idwcount = 0
for (let i = 0, k1 = 0; i < height; i++) {
for (let j = 0; j < width; j++ , k1++) {
let sum0 = 0, sum1 = 0;
for (let k = dlen - 1; k >= 0; k--) {
const dk = d[k];
const dis = Math.pow((i - dk.y), 2) + Math.pow((j - dk.x), 2);
sum0 += dk.value / dis;
sum1 += 1 / dis;
idwcount++
}
if (sum1 != 0)
//matrixData[k1] = sum0 / sum1 - referenceValue;
matrixData.push(sum0 / sum1);
else
matrixData.push(1);
}
}
console.log(idwcount)
var e = new Date().getTime();
console.log('插值：' + (e - s) / 1000 + '秒');
return matrixData;
}
//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();
}
function colorRGB(color) {
let sColor = color.toLowerCase();
// 处理六位的颜色值
const sColorChange = [];
// 十六进制颜色值的正则表达式
const reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
// 如果是16进制颜色
if (sColor && reg.test(sColor)) {
if (sColor.length === 4) {
let sColorNew = '#';
for (let i = 1; i < 4; i += 1) {
sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1));
}
sColor = sColorNew;
}
for (let i = 1; i < 7; i += 2) {
sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)));
}
}
return sColorChange;
}
function getColor(_colors, value) {
var len = _colors.length;
for (var i = 0; i < len; i++) {
if (value > _colors[i].min && value <= _colors[i].max) {
const color = colorRGB(_colors[i].color);
return d3.rgb(color[0], color[1], color[2]);
}
}
}
</script>
</html>