@antv/g2/esm/data/utils/d3-cloud/index.js

the Grammar of Graphics in Javascript

const cloudRadians = Math.PI / 180, cw = (1 << 11) >> 5, ch = 1 << 11;
function cloudText(d) {
    return d.text;
}
function cloudFont() {
    return 'serif';
}
function cloudFontNormal() {
    return 'normal';
}
function cloudFontSize(d) {
    return d.value;
}
function cloudRotate() {
    return ~~(Math.random() * 2) * 90;
}
function cloudPadding() {
    return 1;
}
function cloudDispatch() {
    return;
}
// Fetches a monochrome sprite bitmap for the specified text.
// Load in batches for speed.
function cloudSprite(contextAndRatio, d, data, di) {
    if (d.sprite)
        return;
    const c = contextAndRatio.context, ratio = contextAndRatio.ratio;
    c.clearRect(0, 0, (cw << 5) / ratio, ch / ratio);
    let x = 0, y = 0, maxh = 0;
    const n = data.length;
    --di;
    while (++di < n) {
        d = data[di];
        c.save();
        c.font =
            d.style +
                ' ' +
                d.weight +
                ' ' +
                ~~((d.size + 1) / ratio) +
                'px ' +
                d.font;
        let w = c.measureText(d.text + 'm').width * ratio, h = d.size << 1;
        if (d.rotate) {
            const sr = Math.sin(d.rotate * cloudRadians), cr = Math.cos(d.rotate * cloudRadians), wcr = w * cr, wsr = w * sr, hcr = h * cr, hsr = h * sr;
            w =
                ((Math.max(Math.abs(wcr + hsr), Math.abs(wcr - hsr)) + 0x1f) >> 5) << 5;
            h = ~~Math.max(Math.abs(wsr + hcr), Math.abs(wsr - hcr));
        }
        else {
            w = ((w + 0x1f) >> 5) << 5;
        }
        if (h > maxh)
            maxh = h;
        if (x + w >= cw << 5) {
            x = 0;
            y += maxh;
            maxh = 0;
        }
        if (y + h >= ch)
            break;
        c.translate((x + (w >> 1)) / ratio, (y + (h >> 1)) / ratio);
        if (d.rotate)
            c.rotate(d.rotate * cloudRadians);
        c.fillText(d.text, 0, 0);
        if (d.padding) {
            c.lineWidth = 2 * d.padding;
            c.strokeText(d.text, 0, 0);
        }
        c.restore();
        d.width = w;
        d.height = h;
        d.xoff = x;
        d.yoff = y;
        d.x1 = w >> 1;
        d.y1 = h >> 1;
        d.x0 = -d.x1;
        d.y0 = -d.y1;
        d.hasText = true;
        x += w;
    }
    const pixels = c.getImageData(0, 0, (cw << 5) / ratio, ch / ratio).data, sprite = [];
    while (--di >= 0) {
        d = data[di];
        if (!d.hasText)
            continue;
        const w = d.width, w32 = w >> 5;
        let h = d.y1 - d.y0;
        // Zero the buffer
        for (let i = 0; i < h * w32; i++)
            sprite[i] = 0;
        x = d.xoff;
        if (x == null)
            return;
        y = d.yoff;
        let seen = 0, seenRow = -1;
        for (let j = 0; j < h; j++) {
            for (let i = 0; i < w; i++) {
                const k = w32 * j + (i >> 5), m = pixels[((y + j) * (cw << 5) + (x + i)) << 2]
                    ? 1 << (31 - (i % 32))
                    : 0;
                sprite[k] |= m;
                seen |= m;
            }
            if (seen)
                seenRow = j;
            else {
                d.y0++;
                h--;
                j--;
                y++;
            }
        }
        d.y1 = d.y0 + seenRow;
        d.sprite = sprite.slice(0, (d.y1 - d.y0) * w32);
    }
}
// Use mask-based collision detection.
function cloudCollide(tag, board, sw) {
    sw >>= 5;
    const sprite = tag.sprite, w = tag.width >> 5, lx = tag.x - (w << 4), sx = lx & 0x7f, msx = 32 - sx, h = tag.y1 - tag.y0;
    let x = (tag.y + tag.y0) * sw + (lx >> 5), last;
    for (let j = 0; j < h; j++) {
        last = 0;
        for (let i = 0; i <= w; i++) {
            if (((last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0)) &
                board[x + i])
                return true;
        }
        x += sw;
    }
    return false;
}
function cloudBounds(bounds, d) {
    const b0 = bounds[0], b1 = bounds[1];
    if (d.x + d.x0 < b0.x)
        b0.x = d.x + d.x0;
    if (d.y + d.y0 < b0.y)
        b0.y = d.y + d.y0;
    if (d.x + d.x1 > b1.x)
        b1.x = d.x + d.x1;
    if (d.y + d.y1 > b1.y)
        b1.y = d.y + d.y1;
}
function collideRects(a, b) {
    return (a.x + a.x1 > b[0].x &&
        a.x + a.x0 < b[1].x &&
        a.y + a.y1 > b[0].y &&
        a.y + a.y0 < b[1].y);
}
function archimedeanSpiral(size) {
    const e = size[0] / size[1];
    return function (t) {
        return [e * (t *= 0.1) * Math.cos(t), t * Math.sin(t)];
    };
}
function rectangularSpiral(size) {
    const dy = 4, dx = (dy * size[0]) / size[1];
    let x = 0, y = 0;
    return function (t) {
        const sign = t < 0 ? -1 : 1;
        // See triangular numbers: T_n = n * (n + 1) / 2.
        switch ((Math.sqrt(1 + 4 * sign * t) - sign) & 3) {
            case 0:
                x += dx;
                break;
            case 1:
                y += dy;
                break;
            case 2:
                x -= dx;
                break;
            default:
                y -= dy;
                break;
        }
        return [x, y];
    };
}
// TODO reuse arrays?
function zeroArray(n) {
    const a = [];
    let i = -1;
    while (++i < n)
        a[i] = 0;
    return a;
}
function cloudCanvas() {
    return document.createElement('canvas');
}
function functor(d) {
    return typeof d === 'function'
        ? d
        : function () {
            return d;
        };
}
const spirals = {
    archimedean: archimedeanSpiral,
    rectangular: rectangularSpiral,
};
export function tagCloud() {
    let size = [256, 256], text = cloudText, font = cloudFont, fontSize = cloudFontSize, fontWeight = cloudFontNormal, rotate = cloudRotate, padding = cloudPadding, spiral = archimedeanSpiral, random = Math.random, event = cloudDispatch, words = [], timer = null, timeInterval = Infinity, canvas = cloudCanvas;
    const fontStyle = cloudFontNormal;
    const cloud = {};
    cloud.start = function () {
        const [width, height] = size;
        const contextAndRatio = getContext(canvas()), board = cloud.board ? cloud.board : zeroArray((size[0] >> 5) * size[1]), n = words.length, tags = [], data = words
            .map(function (d, i, data) {
            d.text = text.call(this, d, i, data);
            d.font = font.call(this, d, i, data);
            d.style = fontStyle.call(this, d, i, data);
            d.weight = fontWeight.call(this, d, i, data);
            d.rotate = rotate.call(this, d, i, data);
            d.size = ~~fontSize.call(this, d, i, data);
            d.padding = padding.call(this, d, i, data);
            return d;
        })
            .sort(function (a, b) {
            return b.size - a.size;
        });
        let i = -1, bounds = !cloud.board
            ? undefined
            : [
                {
                    x: 0,
                    y: 0,
                },
                {
                    x: width,
                    y: height,
                },
            ];
        if (timer)
            clearInterval(timer);
        timer = setInterval(step, 0);
        step();
        function step() {
            const start = Date.now();
            while (Date.now() - start < timeInterval && ++i < n) {
                const d = data[i];
                d.x = (width * (random() + 0.5)) >> 1;
                d.y = (height * (random() + 0.5)) >> 1;
                cloudSprite(contextAndRatio, d, data, i);
                if (d.hasText && place(board, d, bounds)) {
                    event.call(null, 'word', { cloud, word: d });
                    tags.push(d);
                    if (bounds) {
                        if (!cloud.hasImage) {
                            // update bounds if image mask not set
                            cloudBounds(bounds, d);
                        }
                    }
                    else {
                        bounds = [
                            { x: d.x + d.x0, y: d.y + d.y0 },
                            { x: d.x + d.x1, y: d.y + d.y1 },
                        ];
                    }
                    // Temporary hack
                    d.x -= size[0] >> 1;
                    d.y -= size[1] >> 1;
                }
            }
            cloud._tags = tags;
            cloud._bounds = bounds;
            if (i >= n) {
                cloud.stop();
                event.call(null, 'end', { cloud, words: tags, bounds });
            }
        }
        return cloud;
    };
    cloud.stop = function () {
        if (timer) {
            clearInterval(timer);
            timer = null;
        }
        return cloud;
    };
    function getContext(canvas) {
        canvas.width = canvas.height = 1;
        const ratio = Math.sqrt(canvas.getContext('2d').getImageData(0, 0, 1, 1).data.length >> 2);
        canvas.width = (cw << 5) / ratio;
        canvas.height = ch / ratio;
        const context = canvas.getContext('2d');
        context.fillStyle = context.strokeStyle = 'red';
        context.textAlign = 'center';
        context.textBaseline = 'middle';
        return { context, ratio };
    }
    function place(board, tag, bounds) {
        // const perimeter = [{ x: 0, y: 0 }, { x: size[0], y: size[1] }],
        const startX = tag.x, startY = tag.y, maxDelta = Math.sqrt(size[0] * size[0] + size[1] * size[1]), s = spiral(size), dt = random() < 0.5 ? 1 : -1;
        let dxdy, t = -dt, dx, dy;
        while ((dxdy = s((t += dt)))) {
            dx = ~~dxdy[0];
            dy = ~~dxdy[1];
            if (Math.min(Math.abs(dx), Math.abs(dy)) >= maxDelta)
                break;
            tag.x = startX + dx;
            tag.y = startY + dy;
            if (tag.x + tag.x0 < 0 ||
                tag.y + tag.y0 < 0 ||
                tag.x + tag.x1 > size[0] ||
                tag.y + tag.y1 > size[1])
                continue;
            // TODO only check for collisions within current bounds.
            if (!bounds || !cloudCollide(tag, board, size[0])) {
                if (!bounds || collideRects(tag, bounds)) {
                    const sprite = tag.sprite, w = tag.width >> 5, sw = size[0] >> 5, lx = tag.x - (w << 4), sx = lx & 0x7f, msx = 32 - sx, h = tag.y1 - tag.y0;
                    let last, x = (tag.y + tag.y0) * sw + (lx >> 5);
                    for (let j = 0; j < h; j++) {
                        last = 0;
                        for (let i = 0; i <= w; i++) {
                            board[x + i] |=
                                (last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0);
                        }
                        x += sw;
                    }
                    delete tag.sprite;
                    return true;
                }
            }
        }
        return false;
    }
    cloud.createMask = (img) => {
        const can = document.createElement('canvas');
        const [width, height] = size;
        // 当 width 或 height 为 0 时，调用 cxt.getImageData 会报错
        if (!width || !height) {
            return;
        }
        const w32 = width >> 5;
        const board = zeroArray((width >> 5) * height);
        can.width = width;
        can.height = height;
        const cxt = can.getContext('2d');
        cxt.drawImage(img, 0, 0, img.width, img.height, 0, 0, width, height);
        const imageData = cxt.getImageData(0, 0, width, height).data;
        for (let j = 0; j < height; j++) {
            for (let i = 0; i < width; i++) {
                const k = w32 * j + (i >> 5);
                const tmp = (j * width + i) << 2;
                const flag = imageData[tmp] >= 250 &&
                    imageData[tmp + 1] >= 250 &&
                    imageData[tmp + 2] >= 250;
                const m = flag ? 1 << (31 - (i % 32)) : 0;
                board[k] |= m;
            }
        }
        cloud.board = board;
        cloud.hasImage = true;
    };
    cloud.timeInterval = function (_) {
        timeInterval = _ == null ? Infinity : _;
    };
    cloud.words = function (_) {
        words = _;
    };
    cloud.size = function (_ = []) {
        size = [+_[0], +_[1]];
    };
    cloud.text = function (_) {
        text = functor(_);
    };
    cloud.font = function (_) {
        font = functor(_);
    };
    cloud.fontWeight = function (_) {
        fontWeight = functor(_);
    };
    cloud.rotate = function (_) {
        rotate = functor(_);
    };
    cloud.canvas = function (_) {
        canvas = functor(_);
    };
    cloud.spiral = function (_) {
        spiral = spirals[_] || _;
    };
    cloud.fontSize = function (_) {
        fontSize = functor(_);
    };
    cloud.padding = function (_) {
        padding = functor(_);
    };
    cloud.random = function (_) {
        random = functor(_);
    };
    cloud.on = function (_) {
        event = functor(_);
    };
    return cloud;
}
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