123

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <!DOCTYPE html>
<html lang="de">
    <head>
        <meta charset="utf-8" />
        <meta
            name="viewport"
            content="width=device-width, initial-scale=1, maximum-scale=5, minimum-scale=1"
        />
        <title>Flower of Life</title>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/svg.js/2.7.1/svg.min.js"></script>
    </head>
    <body></body>
</html>
            
          
!
            
              * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif;
}
html {
    background: #ffffff;
}
#drawing {
    width: 100%;
    height: 100%;
}
#drawing svg {
    width: 100%;
    height: 100%;
}
.options {
    position: absolute;
    top: 5px;
    left: 5px;
    width: auto;
    height: auto;
    background-color: rgba(0, 0, 0, 0.75);
    color: #fff;
    font-size: 10px;
    padding: 5px;
}
.options__listitem {
    margin-bottom: 5px;
    clear: both;
    display: table;
    content: '';
}
.options__listitem:last-child {
    margin-bottom: 0;
}
.options__option {
    font-size: 10px;
    float: left;
    width: 40px;
    line-height: 20px;
    height: 20px;
    padding: 0 0 0 5px;
    margin: 0;
    border: 0;
}
#options__option--color {
    padding: 0;
    cursor: pointer;
}
.options__label {
    float: left;
    width: 60px;
    display: block;
    line-height: 20px;
}
            
          
!
            
              let draw = null,
    set = [],
    options = {};

SVG.on(document, 'DOMContentLoaded', function() {
    init();
    redraw();
});
window.addEventListener('resize', () => {
    if (draw !== null) {
        draw.clear();
    }
    redraw();
});

function init() {
    let html = '';
    html += '<div class="options">';
    html += '<ul class="options__list">';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--rank">rank:</label><input id="options__option--rank" class="options__option options__option--rank" name="rank" type="number" value="3" min="1" max="10" step="1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--speed">speed:</label><input id="options__option--speed" class="options__option options__option--speed" name="speed" type="number" value="50" min="0" max="100" step="1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--scale">scale:</label><input id="options__option--scale" class="options__option options__option--scale" name="scale" type="number" value="50" min="0" max="1000" step="1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--radius">radius:</label><input id="options__option--radius" class="options__option options__option--radius" name="radius" type="number" value="1" min="0" max="9" step="0.1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--offset">offset:</label><input id="options__option--offset" class="options__option options__option--offset" name="offset" type="number" value="1" min="0" max="9" step="0.1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--border">border:</label><input id="options__option--border" class="options__option options__option--border" name="border" type="number" value="1" min="0" max="2" step="0.1" />';
    html += '</li>';
    html += '<li class="options__listitem">';
    html +=
        '<label class="options__label" for="options__option--color">color:</label><input id="options__option--color" class="options__option options__option--color" name="color" type="color" value="#1693A5" />';
    html += '</li>';
    html += '</ul>';
    html += '</div>';
    document.body.insertAdjacentHTML('beforeend', html);

    document.querySelectorAll('.options__option').forEach(el => {
        options[el.getAttribute('name')] = isNaN(el.value) ? el.value : parseFloat(el.value);
        el.addEventListener('change', e => {
            options[el.getAttribute('name')] = isNaN(el.value) ? el.value : parseFloat(el.value);
            redraw();
        });
    });
}

function setup() {
    draw = null;
    set = [];

    if (document.querySelector('#drawing') !== null) {
        document.querySelector('#drawing').remove();
    }
    document.body.insertAdjacentHTML('beforeend', '<div id="drawing"></div>');

    let width = window.innerWidth;
    let height = window.innerHeight;

    draw = SVG('drawing').size(width, height);
    draw.attr('preserveAspectRatio', 'xMinYMin meet');
    draw.attr('viewBox', '0 0 ' + width + ' ' + height);
}

function redraw() {
    // clear
    if (draw !== null) {
        draw.clear();
    }

    // setup
    setup();

    // set shine
    document.documentElement.style.background =
        'radial-gradient(ellipse at center, #ffffff 50%, ' +
        adjustColor(0.5, options.color) +
        ' 100%)';

    // first determine all points (no drawing)
    set.push({ x: 0, y: 0, n: determineNextLevel() });
    if (options.rank > 0) {
        set.push({ x: 0, y: 0 + options.radius * options.offset, n: determineNextLevel() });
        while (determineNextLevel() <= options.rank + 2) {
            calculateNextIntersection();
        }
    }

    // then determine the arcs
    for (const [set__key, set__value] of Object.entries(set)) {
        if (set__value.n < options.rank + 1) {
            set__value.arc = 'circle';
        } else if (set__value.n === options.rank + 1) {
            set__value.arc = determineSpecialArc(set__key, set__value, set__value.n - 1);
        } else if (set__value.n === options.rank + 2) {
            set__value.arc = determineSpecialArc(set__key, set__value, set__value.n - 2);
        }
    }

    // determine colors
    let colors = [],
        shadeFactor = 0.8 / (options.rank + 2);
    for (let n_cur = 0; n_cur <= options.rank + 2; n_cur++) {
        colors.push(adjustColor(shadeFactor * n_cur, options.color));
    }

    // paint all circles
    for (const [set__key, set__value] of Object.entries(set)) {
        if (set__value.arc === 'circle') {
            paintCircle(
                set__value.x,
                set__value.y,
                options.radius,
                colors[(set__value.n - 1) % colors.length]
            );
        } else if (set__value.arc !== null) {
            paintArcWithPoints(
                set__value.arc.x1,
                set__value.arc.y1,
                set__value.arc.x2,
                set__value.arc.y2,
                set__value.arc.arc,
                set__value.x,
                set__value.y,
                options.radius,
                colors[(set__value.n - 1) % colors.length]
            );
        }
    }

    // draw finishing circle
    drawFinishCircle(colors[colors.length - 1]);
}

function determineSpecialArc(set__key, set__value, level) {
    // calculate intersections with level-1
    let intersections = [];
    for (const [set__key2, set__value2] of Object.entries(set)) {
        if (set__key === set__key2) {
            continue;
        }
        if (set__value2.n !== level) {
            continue;
        }
        let intersection = calcIntersection(
            set__value.x,
            set__value.y,
            set__value2.x,
            set__value2.y
        );
        if (intersection !== null) {
            if (
                intersection[0] !== null &&
                intersections.find(
                    i =>
                        round(i.x) === round(intersection[0].x) &&
                        round(i.y) === round(intersection[0].y)
                ) === undefined
            ) {
                intersections.push(intersection[0]);
            }
            if (
                intersection[1] !== null &&
                intersections.find(
                    i =>
                        round(i.x) === round(intersection[1].x) &&
                        round(i.y) === round(intersection[1].y)
                ) === undefined
            ) {
                intersections.push(intersection[1]);
            }
        }
    }
    if (intersections.length < 2) {
        return null;
    }
    // calculate max arc between any combination of points < 180° (this is the final arc!)
    let max = {
        arc: 0,
        x1: null,
        y1: null,
        x2: null,
        y2: null
    };
    for (const [intersections__key1, intersections__value1] of Object.entries(intersections)) {
        for (const [intersections__key2, intersections__value2] of Object.entries(intersections)) {
            if (intersections__key1 <= intersections__key2) {
                continue;
            }
            let arc = calcArgBetweenPoints(
                intersections__value1.x,
                intersections__value1.y,
                set__value.x,
                set__value.y,
                intersections__value2.x,
                intersections__value2.y
            );
            if (arc > max.arc) {
                max = {
                    arc: arc,
                    x1: intersections__value1.x,
                    y1: intersections__value1.y,
                    x2: intersections__value2.x,
                    y2: intersections__value2.y
                };
            }
        }
    }
    return max;
}

function drawFinishCircle(color = 'red') {
    if( options.rank > 1 ) {
    paintCircle(0, 0, options.rank * options.radius, color);
    }
}

function calculateNextIntersection() {
    for (const [set__key1, set__value1] of Object.entries(set)) {
        for (const [set__key2, set__value2] of Object.entries(set)) {
            if (set__key1 === set__key2) {
                continue;
            }

            let intersection = calcIntersection(
                set__value1.x,
                set__value1.y,
                set__value2.x,
                set__value2.y
            );
            if (intersection === null) {
                continue;
            }

            if (
                set.find(
                    i =>
                        round(i.x) === round(intersection[0].x) &&
                        round(i.y) === round(intersection[0].y)
                ) === undefined
            ) {
                intersection[0].n = determineNextLevel();
                set.push(intersection[0]);
                return true;
            }

            if (intersection[1] !== null) {
                if (
                    set.find(
                        i =>
                            round(i.x) === round(intersection[1].x) &&
                            round(i.y) === round(intersection[1].y)
                    ) === undefined
                ) {
                    intersection[1].n = determineNextLevel();
                    set.push(intersection[1]);
                    return true;
                }
            }
        }
    }
}

function calcIntersection(x1, y1, x2, y2) {
    let dist = Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));

    if (dist > 2 * options.radius) {
        return null;
    }

    // mid point
    let m_x1 = (x2 - x1) / 2 + x1,
        m_y1 = (y2 - y1) / 2 + y1;

    // distance from midpoint to one other point
    let m_d = dist / 2;

    // distance from midpoint to intersection points
    let dist2 = Math.sqrt(options.radius * options.radius - m_d * m_d);

    let intersection_1 = {
        x: m_x1 + (dist2 * 1 * (y2 - y1)) / Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2)),
        y: m_y1 + (dist2 * 1 * (x1 - x2)) / Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2))
    };
    let intersection_2 = {
        x: m_x1 + (dist2 * -1 * (y2 - y1)) / Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2)),
        y: m_y1 + (dist2 * -1 * (x1 - x2)) / Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2))
    };

    let ret = [];
    ret.push(intersection_1);

    if (
        round(intersection_1.x) !== round(intersection_2.x) ||
        round(intersection_1.y) !== round(intersection_2.y)
    ) {
        ret.push(intersection_2);
    } else {
        ret.push(null);
    }

    return ret;
}

function calcArgBetweenPoints(x1, y1, x2, y2, x3, y3) {
    let arc = Math.acos(
        Math.round(
            (((x2 - x1) * (x2 - x3) + (y2 - y1) * (y2 - y3)) /
                (Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2)) *
                    Math.sqrt(Math.pow(x2 - x3, 2) + Math.pow(y2 - y3, 2)))) *
                100
        ) / 100
    );
    arc = Math.round((arc * 180) / Math.PI);
    if (arc === 0) {
        arc = 180;
    }
    return arc;
}

function determineNextLevel() {
    let n = 1;
    while (3 * n * (n - 1) + 1 < set.length + 1) {
        n++;
    }
    return n;
}

function round(val) {
    return Math.round(val * 1000) / 1000;
}

function paintCircle(x, y, r, color = 'red') {
    paintArcWithPoints(x, y - r, x, y - r, 360, x, y, r, color);
}

function paintArcWithPoints(x1, y1, x2, y2, arc, mx, my, r, color = 'red') {
    let dir = 0;
    if (
        (round(mx) == 0 && round(y1) == round(y2) && (my < 0 || x1 > x2)) ||
        (round(mx) > 0 && round(y2) > round(y1)) ||
        (round(mx) < 0 && round(y2) < round(y1))
    ) {
        dir = 1;
    }

    let scale = options.scale;
    scale *= Math.min(window.innerWidth, window.innerHeight);
    scale /= 450;

    mx = mx * scale + window.innerWidth / 2;
    x1 = x1 * scale + window.innerWidth / 2;
    x2 = x2 * scale + window.innerWidth / 2;
    my = -1 * my * scale + window.innerHeight / 2;
    y1 = -1 * y1 * scale + window.innerHeight / 2;
    y2 = -1 * y2 * scale + window.innerHeight / 2;
    r = r * scale;

    // arc
    var d = ['M', x1, y1, 'A', r, r, 0, 0, dir, x2, y2].join(' ');

    // circle
    if (x1 === x2 && y1 === y2) {
        d =
            'M ' +
            mx +
            ' ' +
            my +
            ' m -' +
            r +
            ', 0 a ' +
            r +
            ',' +
            r +
            ' 0 1,0 ' +
            r * 2 +
            ',0 a ' +
            r +
            ',' +
            r +
            ' 0 1,0 -' +
            r * 2 +
            ',0';
    }

    let speed = options.speed;
    speed = 100 - speed;
    speed = (10000 / 100) * speed;
    if (speed === 0) {
        speed = 1;
    }

    let border = options.border;
    border = border * 1.5;

    let c1 = draw
        .path(d)
        .attr({
            'stroke-dasharray': 2 * r * Math.PI * (arc / 360),
            'stroke-dashoffset': -2 * r * Math.PI * (arc / 360),
            'stroke-width': border,
            stroke: color,
            fill: 'transparent',
            'fill-opacity': 0.1
        })
        .animate({ duration: speed, ease: '<>' })
        .attr({ 'stroke-dashoffset': 0 });
}

function adjustColor(p, c0, c1, l) {
    let r,
        g,
        b,
        P,
        f,
        t,
        h,
        i = parseInt,
        m = Math.round,
        a = typeof c1 == 'string';
    if (
        typeof p != 'number' ||
        p < -1 ||
        p > 1 ||
        typeof c0 != 'string' ||
        (c0[0] != 'r' && c0[0] != '#') ||
        (c1 && !a)
    )
        return null;
    if (!this.pSBCr)
        this.pSBCr = d => {
            let n = d.length,
                x = {};
            if (n > 9) {
                ([r, g, b, a] = d = d.split(',')), (n = d.length);
                if (n < 3 || n > 4) return null;
                (x.r = i(r[3] == 'a' ? r.slice(5) : r.slice(4))),
                    (x.g = i(g)),
                    (x.b = i(b)),
                    (x.a = a ? parseFloat(a) : -1);
            } else {
                if (n == 8 || n == 6 || n < 4) return null;
                if (n < 6)
                    d = '#' + d[1] + d[1] + d[2] + d[2] + d[3] + d[3] + (n > 4 ? d[4] + d[4] : '');
                d = i(d.slice(1), 16);
                if (n == 9 || n == 5)
                    (x.r = (d >> 24) & 255),
                        (x.g = (d >> 16) & 255),
                        (x.b = (d >> 8) & 255),
                        (x.a = m((d & 255) / 0.255) / 1000);
                else (x.r = d >> 16), (x.g = (d >> 8) & 255), (x.b = d & 255), (x.a = -1);
            }
            return x;
        };
    (h = c0.length > 9),
        (h = a ? (c1.length > 9 ? true : c1 == 'c' ? !h : false) : h),
        (f = pSBCr(c0)),
        (P = p < 0),
        (t =
            c1 && c1 != 'c'
                ? pSBCr(c1)
                : P
                ? { r: 0, g: 0, b: 0, a: -1 }
                : { r: 255, g: 255, b: 255, a: -1 }),
        (p = P ? p * -1 : p),
        (P = 1 - p);
    if (!f || !t) return null;
    if (l) (r = m(P * f.r + p * t.r)), (g = m(P * f.g + p * t.g)), (b = m(P * f.b + p * t.b));
    else
        (r = m((P * f.r ** 2 + p * t.r ** 2) ** 0.5)),
            (g = m((P * f.g ** 2 + p * t.g ** 2) ** 0.5)),
            (b = m((P * f.b ** 2 + p * t.b ** 2) ** 0.5));
    (a = f.a),
        (t = t.a),
        (f = a >= 0 || t >= 0),
        (a = f ? (a < 0 ? t : t < 0 ? a : a * P + t * p) : 0);
    if (h)
        return (
            'rgb' +
            (f ? 'a(' : '(') +
            r +
            ',' +
            g +
            ',' +
            b +
            (f ? ',' + m(a * 1000) / 1000 : '') +
            ')'
        );
    else
        return (
            '#' +
            (4294967296 + r * 16777216 + g * 65536 + b * 256 + (f ? m(a * 255) : 0))
                .toString(16)
                .slice(1, f ? undefined : -2)
        );
}
            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.

Console