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CSS3 & CSS var & :root

How to change CSS :root color variables in JavaScript

https://stackoverflow.com/questions/37801882/how-to-change-css-root-color-variables-in-javascript

https://developer.mozilla.org/en-US/docs/Web/CSS/:root

    :root {
        --angleBegin: 0deg;
        --angleEnd: 0deg;
        /* fixed angle enums */
        --angle0: 0deg;
        /* --angle30: 30deg; */
        --angle60: 60deg;
        /* --angle90: 90deg; */
        --angle120: 120deg;
        --angle180: 180deg;
        --angle240: 240deg;
        --angle300: 300deg;
        --angle360: 360deg;
    }

css change skin

// --angleBegin = --angle0;
// --angleBegin = --angle60;// and so on...

document.documentElement.style.setProperty('--your-variable', '#YOURCOLOR');

// css3 vars
document.documentElement.style.setProperty("--angleBegin", "--angle60");

demo

https://codepen.io/xgqfrms/pen/rELraa

https://codepen.io/xgqfrms/pen/agZGZY

https://codepen.io/xgqfrms/pen/vqKWov

    :root {
        --angleBegin: 0deg;
        --angleEnd: 0deg;
        --angleDefault: 0deg;
        /* fixed angle enums */
        --angle0: 0deg;
        /* --angle30: 30deg; */
        --angle60: 60deg;
        /* --angle90: 90deg; */
        --angle120: 120deg;
        --angle180: 180deg;
        --angle240: 240deg;
        --angle300: 300deg;
        --angle360: 360deg;
    }
    section{
        margin: 100px auto;
        position: relative;
    }
    div#div {
        position: absolute;
        box-sizing: border-box;
         100px;
        height: 100px;
        margin-top: 50px;
        margin-left: 200px;
        background-color:#ccc;
        border-top: 1px solid #f00;
        border-right: 1px solid #0f0;
        border-bottom: 1px solid  #00f;
        border-left: 1px solid #f0f;
        /* transform: rotate(60deg); */
        /* transform: rotate(var(--angle0)); */
        /* transform: rotate(var(--angleEnd)); */
        transform: rotate(var(--angleDefault));
        transform-origin: 200px 200px;
        /* transform-origin: 50% 50%; */
    }
    div#bg {
        position: absolute;
        box-sizing: border-box;
         100px;
        height: 100px;
        margin-top: 50px;
        margin-left: 200px;
        background-color:#ccc;
        border-top: 1px solid #f00;
        border-right: 1px solid #0f0;
        border-bottom: 1px solid  #00f;
        border-left: 1px solid #f0f;
        transform: rotate(0deg);
        transform-origin: 200px 200px;
    }
    .circle{
        position: absolute;
        box-sizing: border-box;
         400px;
        height: 400px;
        margin-top: 50px;
        margin-left: 200px;
        background-color: rgba(123, 123, 123, 0.5);
        border: 10px solid red;
        border-radius: 50%;
    }
    .rotateAngle {
        animation: autoRotateWithAngleVar 1s 1 both ease;
    }
    @keyframes autoRotateWithAngleVar {
        0% {
            transform: rotate(var(--angleBegin));
            /* transform: rotate3D(0, 0, 1, var(--angleBegin)); */
        }
        to {
            transform: rotate(var(--angleEnd));
            /* transform: rotate3D(0, 0, 1, var(--angleEnd)); */
        }
    }

    <section>
        <div>
            <button data-btn="btn">click</button>
        </div>
        <div id="div" data-begin="0" data-end="0">六边形 Hexagon</div>
        <div id="bg">六边形 Hexagon</div>
        <div class="circle"></div>
    </section>

    let div = document.querySelector(`[id="div"]`);
    let btn = document.querySelector(`[data-btn="btn"]`);
    // const autoRotateWithAngles = (begin = 0, end = 0) => {
    //     // document.documentElement.style.setProperty("--angleBegin", "--angle60");
    //     // document.documentElement.style.setProperty("--angleEnd", "--angle60");
    //     document.documentElement.style.setProperty("--angleBegin", `--angle${begin}`);
    //     document.documentElement.style.setProperty("--angleEnd", `--angle${end}`);
    //     // rotateAngle
    //     div.classList.toggle(`rotateAngle`);
    // };
    const autoRotateWithAngles = (direct = "postive", angle = 0) => {
        let begin = parseInt(div.dataset.begin);
        let end = parseInt(div.dataset.end);
        // Math.abs();
        if (direct === "postive") {
            let beginAngle = begin + angle;
            let endAngle = end + angle;
            div.dataset.begin = beginAngle > 360 ? beginAngle % 360 : beginAngle;
            div.dataset.end = endAngle > 360 ? endAngle % 360 : endAngle;
        }
        if (direct === "center") {
            // do nothing
        }
        if (direct === "nagitive") {
            div.dataset.begin = begin - angle;
            div.dataset.end = end - angle;
        }
        document.documentElement.style.setProperty("--angleBegin", `var(--angle${(begin + angle) > 360 ? (begin + angle) % 360 : (begin + angle)})`);
        document.documentElement.style.setProperty("--angleEnd", `var(--angle${(end + angle) > 360 ? (end + angle) % 360 : (end + angle)})`);
        // rotateAngle
        // div.classList.toggle(`rotateAngle`);
        div.classList.remove(`rotateAngle`);
        setTimeout(() => {
            div.classList.add(`rotateAngle`);
            document.documentElement.style.setProperty("--angleDefault", `var(--angle${(begin + angle) % 360})`);
            // document.documentElement.style.setProperty("--angleDefault", `var(--angle${(end + angle) % 360})`);
            // document.documentElement.style.setProperty("--angleDefault", `--angle${end + angle}`);
            // document.documentElement.style.setProperty("--angleDefault", `var(--angle${(end + angle) > 360 ? (end + angle) % 360 : (end + angle)})`);
        }, 1000);
    };
    btn.addEventListener(`click`, () => {
        autoRotateWithAngles("postive", 60);
    });

---

CSS3 rotate angle & positive & negative

setAttribute(disabled, false); & .removeAttribute(disabled);

<!DOCTYPE html>
<html lang="zh-Hans">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta name="author" content="xgqfrms">
    <meta name="generator" content="VS code">
    <!-- <link rel="icon" type="image/x-icon" href="./favicon.ico" />
    <link rel="icon" type="image/png" href="./favicon.png" /> -->
    <title>CSS3 rotate angle & positive & negative</title>
    <!--  Hexagon -->
    <style>
        :root {
            --angleBegin: 0deg;
            --angleEnd: 0deg;
            --angleDefault: 0deg;
            /* fixed angle enums */
            --angle0: 0deg;
            --angle60: 60deg;
            --angle120: 120deg;
            --angle180: 180deg;
            --angle240: 240deg;
            --angle300: 300deg;
            --angle360: 360deg;
        }
        section{
            margin: 100px auto;
            position: relative;
        }
        div#div {
            position: absolute;
            box-sizing: border-box;
             100px;
            height: 100px;
            margin-top: 50px;
            margin-left: 200px;
            background-color:#ccc;
            border-top: 1px solid #f00;
            border-right: 1px solid #0f0;
            border-bottom: 1px solid  #00f;
            border-left: 1px solid #f0f;
            transform: rotate(var(--angleDefault));
            transform-origin: 200px 200px;
        }
        #div::before {
            content: "";
             6px;
            height: 6px;
            position: absolute;
            left: 0px;
            top: -5px;
            border: 2px solid #FFF;
            border-radius: 50%;
        }
        #div::after {
            content: "";
            position: absolute;
            left: 50%;
            top: -19%;
            height: 30px;
             30px;
            background-color: #00c991;
            border-radius: 50% 50% 0;
            transform: translate(-50%, -50%) rotate(45deg);
        }
        div#bg {
            position: absolute;
            box-sizing: border-box;
             100px;
            height: 100px;
            margin-top: 50px;
            margin-left: 200px;
            background-color:#ccc;
            border-top: 1px solid #f00;
            border-right: 1px solid #0f0;
            border-bottom: 1px solid  #00f;
            border-left: 1px solid #f0f;
            transform: rotate(0deg);
            transform-origin: 200px 200px;
        }
        .circle{
            position: absolute;
            box-sizing: border-box;
             400px;
            height: 400px;
            margin-top: 50px;
            margin-left: 200px;
            background-color: rgba(123, 123, 123, 0.5);
            border: 10px solid red;
            border-radius: 50%;
        }
        .rotateAngle {
            animation: autoRotateWithAngleVar 1s 1 both ease;
        }
        @keyframes autoRotateWithAngleVar {
            0% {
                transform: rotate(var(--angleBegin));
            }
            to {
                transform: rotate(var(--angleEnd));
            }
        }
    </style>
</head>
<body>
    <section>
        <div>
            <button data-btn="btn1">positive click</button>
            <button data-btn="btn2">negative click</button>
        </div>
        <div id="div" data-begin="0" data-end="0">六边形 Hexagon</div>
        <div id="bg">六边形 Hexagon</div>
        <div class="circle"></div>
    </section>
    <!-- js -->
    <script>
        let log = console.log;
        let div = document.querySelector(`[id="div"]`);
        let btn1 = document.querySelector(`[data-btn="btn1"]`);
        let btn2 = document.querySelector(`[data-btn="btn2"]`);
        const autoRotateWithAngles = (direct = "postive", angle = 0) => {
            let begin = parseInt(div.dataset.begin);
            let end = parseInt(div.dataset.end);
            if (direct === "postive") {
                let beginAngle = begin + angle;
                let endAngle = end + angle;
                div.dataset.begin = beginAngle > 360 ? beginAngle % 360 : beginAngle;
                div.dataset.end = endAngle > 360 ? endAngle % 360 : endAngle;
                //
                // document.documentElement.style.setProperty("--angleBegin", `var(--angle${(begin + angle) > 360 ? (begin + angle) % 360 : (begin + angle)})`);
                // document.documentElement.style.setProperty("--angleEnd", `var(--angle${(end + angle) > 360 ? (end + angle) % 360 : (end + angle)})`);
                // div.classList.remove(`rotateAngle`);
                // setTimeout(() => {
                //     div.classList.add(`rotateAngle`);
                //     document.documentElement.style.setProperty("--angleDefault", `var(--angle${(begin + angle) % 360})`);
                // }, 1000);
                document.documentElement.style.setProperty("--angleBegin", `var(--angle${beginAngle > 360 ?  beginAngle % 360 : beginAngle})`);
                document.documentElement.style.setProperty("--angleEnd", `var(--angle${endAngle > 360 ? endAngle  % 360 : endAngle})`);
                div.classList.remove(`rotateAngle`);
                setTimeout(() => {
                    div.classList.add(`rotateAngle`);
                    document.documentElement.style.setProperty("--angleDefault", `var(--angle${beginAngle % 360})`);
                }, 1000);
            }
            if (direct === "center") {
                // do nothing
            }
            if (direct === "nagitive") {
                let beginAngle = (begin - angle) < 0 ? 360 - Math.abs(begin - angle) : (begin - angle);
                let endAngle = (end - angle) < 0 ? 360 - Math.abs(end - angle) : (end - angle);
                // let beginAngle = Math.abs(begin - angle);
                // let endAngle = Math.abs(end - angle);
                log(`beginAngle =`, beginAngle);
                log(`endAngle =`, endAngle);
                div.dataset.begin = beginAngle > 360 ? (beginAngle % 360) : beginAngle;
                div.dataset.end = endAngle > 360 ? (endAngle % 360) : endAngle;
                log(`div.dataset.begin =`, div.dataset.begin);
                log(`div.dataset.end =`, div.dataset.end);
                // 
                // document.documentElement.style.setProperty("--angleBegin", `var(--angle${(begin - angle) > 360 ? (begin - angle) % 360 : (begin - angle)})`);
                // document.documentElement.style.setProperty("--angleEnd", `var(--angle${(end - angle) > 360 ? (end - angle) % 360 : (end - angle)})`);
                // div.classList.remove(`rotateAngle`);
                // setTimeout(() => {
                //     div.classList.add(`rotateAngle`);
                //     document.documentElement.style.setProperty("--angleDefault", `var(--angle${(begin - angle) % 360})`);
                // }, 1000);
                document.documentElement.style.setProperty("--angleBegin", `var(--angle${beginAngle > 360 ?  beginAngle % 360 : beginAngle})`);
                document.documentElement.style.setProperty("--angleEnd", `var(--angle${endAngle > 360 ? endAngle  % 360 : endAngle})`);
                div.classList.remove(`rotateAngle`);
                setTimeout(() => {
                    div.classList.add(`rotateAngle`);
                    document.documentElement.style.setProperty("--angleDefault", `var(--angle${beginAngle % 360})`);
                }, 1000);
            }
        };
        btn1.addEventListener(`click`, () => {
            btn1.setAttribute(`disabled`, true);
            autoRotateWithAngles("postive", 60);
            // autoRotateWithAngles("postive", 120);
            setTimeout(() => {
                // btn.setAttribute(`disabled`, false);
                btn1.removeAttribute(`disabled`);
            }, 1000);
        });
        btn2.addEventListener(`click`, () => {
            btn2.setAttribute(`disabled`, true);
            autoRotateWithAngles("nagitive", 60);
            // autoRotateWithAngles("nagitive", 120);
            setTimeout(() => {
                // btn.setAttribute(`disabled`, false);
                btn2.removeAttribute(`disabled`);
            }, 1000);
        });
    </script>
</body>
</html>

demo

https://repl.it/@xgqfrms/autoLoopArray-with-direction

touch circle menu

html & :root

let html = document.querySelector(`:root`);
 
html.scrollHeight;
 
html.innerText = html.innerText.split(' ').join('');

refs

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