三维可视化开发这事儿前端人员能搞定吗？

用thingjs前端工程师也能开发可视化应用的。可以来试！

/**

* 说明：在 canvas 中利用图片做背景进行绘制，模拟指标面板的应用场景

* 操作：点击按钮

* 难度：★★★★☆

*/

var app = new THING.App({

    url: 'https://www.thingjs.com/static/models/storehouse'    // 三维可视化场景地址

});

// 计时器

var timer;

app.on('load', function () {

    // 设置摄像机位置和目标点

    app.camera.position = [24.036125586913663, 2.654545333744903, 15.118547603300897];

    app.camera.target = [18.887027584951163, 1.4664667942992755, 2.077588743688154];

    new THING.widget.Button('图片+canvas画图', function () {

        var plane = app.query('#myPlane01')[0];

        if (plane) return;

        var car = app.query('car01')[0];

        var imgUrl = 'https://www.thingjs.com/static/images/monitorPanel3.png';

        var imgWidth = 512;

        var imgHeight = 329;

        var img = new Image(imgWidth, imgHeight);

        img.crossOrigin = "Anonymous";

        img.src = imgUrl;

        img.onload = function () {

            var canvas = createCanvas({ image: img, text: 10, imgWidth, imgHeight });

            var newImg = new Image(canvas.width, canvas.height);

            newImg.src = canvas.toDataURL("image/png");

            var plane = app.create({

                type: 'Plane',

                id: 'myPlane01',

                width: imgWidth * 0.004,

                height: imgHeight * 0.004,

                parent: car,

                localPosition: [0, 3, 0],

                style: {

                    image: newImg,

                    opacity: 0.9,

                    color: '#ffffff'

                }

            });

            // 存储三维可视化原始图片 用于重绘

            plane['origialImg'] = img;

            // 存储 canvas 用于重绘

            plane['myCanvas'] = canvas;

        };

    })

    new THING.widget.Button('更新温度值', function () {

        var plane = app.query('#myPlane01')[0];

        if (plane) {

            updateImage(plane)

        }

    });

    new THING.widget.Button('停止更新', function () {

        if (timer) {

            clearInterval(timer);

            timer = null;

        }

    })

})

function createCanvas(param) {

    var canvas = param.canvas;

    var image = param.image;

    var text = param.text;

    if (!param.canvas) {

        canvas = document.createElement("canvas");

        canvas.width = param.imgWidth;

        canvas.height = param.imgHeight;

    }

    var ctx = canvas.getContext("2d");

    ctx.clearRect(0, 0, canvas.width, canvas.height);

    ctx.drawImage(image, 0, 0);

    ctx.fillStyle = "rgb(255, 255, 255)";

    ctx.font = "80px sans-serif";

    ctx.textBaseline = "middle";

    ctx.fillText('温度：', 50, canvas.height / 2);

    ctx.fillText(text, 270, canvas.height / 2);

    ctx.fillText('℃', 380, canvas.height / 2);

    return canvas;

}

function updateImage(plane) {

    if (!timer) {

        timer = setInterval(() => {

            var canvas = createCanvas({ image: plane['origialImg'], text: THING.Math.randomInt(0, 38), canvas: plane.myCanvas });

            var newImg = new Image(canvas.width, canvas.height);

            newImg.src = canvas.toDataURL("image/png");

            plane.style.image = newImg;

        }, 1000)

    }

}