基于vue3.x与 three.js模拟地球内部结构
前言
基于threejs、vue3.x、热力图实现了地球结构可视化展示。
1.引入库
threejs、 vue3.x
热力图代码
/**
* 热力图的生成
*/
//随机给出温度值 储存在2维数组
let getTemperature = () => {
let temperatureArray = new Array();
for (let i = 0; i < 9; i++) {
temperatureArray[i] = new Array();
for (let j = 0; j < 9; j++) {
temperatureArray[i][j] = parseInt(JSON.stringify(Math.random() * 35));
}
}
return temperatureArray;
}
//获取温度点的XY坐标
let getPositionXY = (i: any, j: any) => {
let positionX = [5, 20, 35, 50, 65, 80, 95, 80, 90];
let positionY = [5, 20, 35, 50, 65, 80, 95, 80, 90];
return {
x: positionX[i],
y: positionY[j]
}
}
//绘制辐射圆
let drawCircular = (context: any, opts: any) => {
let { x, y, radius, weight } = opts;
radius = parseInt(JSON.stringify(radius * weight));//计算出实际的辐射圆
// 创建圆设置填充色
let rGradient = context.createRadialGradient(x, y, 0, x, y, radius);
rGradient.addColorStop(0, "rgba(0, 1, 0, 1)");
rGradient.addColorStop(1, "rgba(1, 0, 0, 0)");
context.fillStyle = rGradient;
// 设置globalAlpha
context.globalAlpha = weight;
context.beginPath();
context.arc(x, y, radius, 0, 2 * Math.PI);
context.closePath();
context.fill();// 填充
}
let createPalette = () => {
//颜色条的颜色分布
let colorStops: any = {
0: "#FDF5E6",
0.2: "#FFEBCD",
0.4: "#FFFCF5",
0.6: "#FFE4B5",
0.8: "#FFFF00",
1: "#FF4500"
};
//颜色条的大小
let width = 256, height = 1;
// 创建canvas
let paletteCanvas = document.createElement("canvas");
paletteCanvas.width = width;
paletteCanvas.height = height;
let ctx: any = paletteCanvas.getContext("2d");
// 创建线性渐变色
let linearGradient = ctx.createLinearGradient(0, 0, width, 0);
for (const key in colorStops) {
linearGradient.addColorStop(key, colorStops[key]);
}
// 绘制渐变色条
ctx.fillStyle = linearGradient;
ctx.fillRect(0, 0, width, height);
let imageData = ctx.getImageData(0, 0, width, height).data;// 读取像素值
return {
canvas: paletteCanvas,
pickColor: function (position: any) {
return imageData.slice(position * 4, position * 4 + 3)
}
}
}
// 生成热力图
let heatMap = (width: any, height: any) => {
let canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
let context: any = canvas.getContext("2d");
let tenperature = getTemperature();
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
let weight = tenperature[i][j] / 30; //计算出当前温度占标准温度的权值
drawCircular(context, {
x: getPositionXY(i, j).x,
y: getPositionXY(i, j).y,
radius: 20.,
weight: weight
})
}
}
let palette = createPalette();
document.body.appendChild(palette.canvas);
let imageData = context.getImageData(0, 0, width, height);
let data = imageData.data;
for (let i = 3; i < data.length; i += 4) {//根据画面数据绘制颜色
let alpha = data[i];
let color = palette.pickColor(alpha);
data[i - 3] = color[0];
data[i - 2] = color[1];
data[i - 1] = color[2];
}
for (let i = 0; i < imageData.data.length; i += 4) {// 背景设置成青色
if (imageData.data[i + 3] == 0) {
imageData.data[i] = 0;
imageData.data[i + 1] = 255;
imageData.data[i + 2] = 255;
imageData.data[i + 3] = 255;
}
}
context.putImageData(imageData, 0, 0);//设置画面数据
return canvas;
}
export default heatMap;```
可视化展示
模拟地球结构
预览地址