最近有一个项目,有一个echarts的热力图,数据大概500万条左右,由于数据很多,客户想实现一个效果,那就是让热力图中的数据,在x轴方向从右侧向左侧滑动,类似于滚动动画,现在不太清楚后端怎么给我数据配合前端实现这种效果
echartdata(){
var chartDom = document.getElementById("red");
var myChart = echarts.init(chartDom);
var option;
let noise = getNoiseHelper();
let xData = [];
let yData = [];
var xMaxValue = this.xMax
var yMaxValue = this.yMax
noise.seed(Math.random());
function generateData(theta, min, max) {
let data = [];
for (let i = 0; i <= xMaxValue; i++) {
for (let j = 0; j <= 100; j++) {
// let x = (max - min) * i / 200 + min;
// let y = (max - min) * j / 100 + min;
data.push([i, j, noise.perlin2(i / 40, j / 20) + 0.5]);
// data.push([i, j, normalDist(theta, x) * normalDist(theta, y)]);
}
xData.push(i);
}
for (let j = 0; j < yMaxValue; j++) {
yData.push(j);
}
// console.log(xData,'xData');
// console.log(yData,'yData');
return data;
}
let data = generateData(2, -5, 5);
// // let data = this.tableData
console.log(this.tableData, '777777777');
option = {
tooltip: {},
xAxis: {
type: "category",
data: xData,
},
yAxis: {
type: "category",
data: yData,
},
visualMap: {
min: this.dataMin,
max: this.dataMax,
calculable: true,
realtime: false,
precision:4,
inRange: {
color: [
"#313695",
"#4575b4",
"#74add1",
"#abd9e9",
"#e0f3f8",
"#ffffbf",
"#fee090",
"#fdae61",
"#f46d43",
"#d73027",
"#a50026",
],
},
},
series: [
{
name: "Gaussian",
type: "heatmap",
data: this.tableData,
emphasis: {
itemStyle: {
borderColor: "#333",
borderWidth: 1,
},
},
progressive: 1000,
animation: false,
},
],
};
///////////////////////////////////////////////////////////////////////////
// perlin noise helper from https://github.com/josephg/noisejs
///////////////////////////////////////////////////////////////////////////
function getNoiseHelper() {
class Grad {
constructor(x, y, z) {
this.x = x;
this.y = y;
this.z = z;
}
dot2(x, y) {
return this.x * x + this.y * y;
}
dot3(x, y, z) {
return this.x * x + this.y * y + this.z * z;
}
}
const grad3 = [
new Grad(1, 1, 0),
new Grad(-1, 1, 0),
new Grad(1, -1, 0),
new Grad(-1, -1, 0),
new Grad(1, 0, 1),
new Grad(-1, 0, 1),
new Grad(1, 0, -1),
new Grad(-1, 0, -1),
new Grad(0, 1, 1),
new Grad(0, -1, 1),
new Grad(0, 1, -1),
new Grad(0, -1, -1),
];
const p = [
151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225,
140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247,
120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32, 57,
177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74,
165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122,
60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54,
65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169,
200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3,
64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85,
212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170,
213, 119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43,
172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185,
112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191,
179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31,
181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150,
254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195,
78, 66, 215, 61, 156, 180,
];
// To remove the need for index wrapping, double the permutation table length
let perm = new Array(512);
let gradP = new Array(512);
// This isn't a very good seeding function, but it works ok. It supports 2^16
// different seed values. Write something better if you need more seeds.
function seed(seed) {
if (seed > 0 && seed < 1) {
// Scale the seed out
seed *= 65536;
}
seed = Math.floor(seed);
if (seed < 256) {
seed |= seed << 8;
}
for (let i = 0; i < 256; i++) {
let v;
if (i & 1) {
v = p[i] ^ (seed & 255);
} else {
v = p[i] ^ ((seed >> 8) & 255);
}
perm[i] = perm[i + 256] = v;
gradP[i] = gradP[i + 256] = grad3[v % 12];
}
}
seed(0);
// ##### Perlin noise stuff
function fade(t) {
return t * t * t * (t * (t * 6 - 15) + 10);
}
function lerp(a, b, t) {
return (1 - t) * a + t * b;
}
// 2D Perlin Noise
function perlin2(x, y) {
// Find unit grid cell containing point
let X = Math.floor(x),
Y = Math.floor(y);
// Get relative xy coordinates of point within that cell
x = x - X;
y = y - Y;
// Wrap the integer cells at 255 (smaller integer period can be introduced here)
X = X & 255;
Y = Y & 255;
// Calculate noise contributions from each of the four corners
let n00 = gradP[X + perm[Y]].dot2(x, y);
let n01 = gradP[X + perm[Y + 1]].dot2(x, y - 1);
let n10 = gradP[X + 1 + perm[Y]].dot2(x - 1, y);
let n11 = gradP[X + 1 + perm[Y + 1]].dot2(x - 1, y - 1);
// Compute the fade curve value for x
let u = fade(x);
// Interpolate the four results
return lerp(lerp(n00, n10, u), lerp(n01, n11, u), fade(y));
}
return {
seed,
perlin2,
};
}
option && myChart.setOption(option);
},
现在热力图的数据换成了接口的数据,想过截取一段数据,想过websocket实现,现在不太清楚怎么去实现这种效果,截取数据感觉效果应该不是那种滑动,求大佬指点一下应该怎么实现