Typescript/Angular 4/class-based adaptation

[michaelByrne]

Hey there,

I've been working on a Typescript/Angular 4/class-based adaptation of this and have a very brittle, very hacky version working (that doesn't feature much Typescript at the moment). I thought I would post it here in case anyone had thoughts on making this an actual properly realized thing. So far I've really just tested it on small (< 6 word) lists. Ultimately, I'd like to publish this as an Angular component but I don't think we need to think about that too much here.

One problem I have now is that when I randomize start positions I get words all over the place rather than properly clustered. I haven't figured out why.

Here goes:

`import { Injectable, ElementRef } from '@angular/core';

import { Word, WordFreq, CloudConfig } from './cloud.config';

@Injectable() export class CloudService {

cloudRadians = Math.PI / 180;
cw = 1 << 11 >> 5;
ch = 1 << 11;
size = [1239, 909.25];
contextAndRatio = this.getContext();
board = this.zeroArray((this.size[0] >> 5) * this.size[1]);
tags = [];
words: any;
n: number;
i: number;
data: any;
timer: any;
timeInterval = Infinity;
bounds = null;

start(words, config) {
    this.words = words;
    let c = this.contextAndRatio.context;
    let ratio = this.contextAndRatio.ratio;
    c.clearRect(0, 0, (this.cw << 5) / ratio, this.ch / ratio);
    this.i = -1;
    this.n = this.words.length;
    this.timer = null;

    this.data = this.words.map(function(d, i) {
        d.text = d.text;
        d.font = "Impact";
        d.style = "normal";
        d.weight = "normal";
        d.rotate = (~~(Math.random() * 6) - 3) * 30;
        d.size = d.size;
        d.padding = 1;
        return d;
    }).sort(function(a, b) {
        return b.size - a.size;
    });

    if (this.timer)
        clearInterval(this.timer);
    this.timer = setInterval(this.step, 2);
    this.step();

}

step() {
    this.i = -1;
    this.n = this.words.length;
    var start = Date.now();
    while (Date.now() - start < this.timeInterval && ++this.i < this.n && this.timer) {
        var d = this.words[this.i];
        d.x = (this.size[0] * (Math.random() + .5)) >> 1;
        d.y = (this.size[1] * (Math.random() + .5)) >> 1;
        // d.x = 350;
        // d.y = 350;

        this.cloudSprite(this.contextAndRatio, d, this.words, this.i);
        if (d.hasText && this.place(this.board, d, this.bounds)) {
            this.tags.push(d);
            if (this.bounds) {
                this.cloudBounds(this.bounds, d);
            }
            else this.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 -= this.size[0] >> 1;
            d.y -= this.size[1] >> 1;

        }
    }
    console.log(this.tags);
    if (this.i >= this.n) {
        this.stop();
    }
}

stop() {
    if (this.timer) {
        clearInterval(this.timer);
        this.timer = null;
    }
};

cloudSprite(contextAndRatio, d, data, di) {
    if (d.sprite) return;
    let c = contextAndRatio.context,
        ratio = contextAndRatio.ratio;

    c.clearRect(0, 0, (this.cw << 5) / ratio, this.ch / ratio);

    let x = 0,
        y = 0,
        maxh = 0,
        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;

        var w = c.measureText(d.text + "m").width * ratio,
            h = d.size << 1;

        if (d.rotate) {
            let sr = Math.sin(d.rotate * this.cloudRadians),
                cr = Math.cos(d.rotate * this.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 >= (this.cw << 5)) {
            x = 0;
            y += maxh;
            maxh = 0;
        }

        if (y + h >= this.ch) break;
        c.translate((x + (w >> 1)) / ratio, (y + (h >> 1)) / ratio);
        if (d.rotate)
            c.rotate(d.rotate * this.cloudRadians);
        c.fillText(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;
    }
    var pixels = c.getImageData(0, 0, (this.cw << 5) / ratio, this.ch / ratio).data,
        sprite = [];
    while (--di >= 0) {
        d = data[di];
        if (!d.hasText) continue;
        let w = d.width;
        let w32 = w >> 5;
        let h = d.y1 - d.y0;
        // Zero the buffer
        for (var i = 0; i < h * w32; i++) sprite[i] = 0;
        x = d.xoff;
        if (x == null) return;
        y = d.yoff;
        var seen = 0,
            seenRow = -1;
        for (var j = 0; j < h; j++) {
            for (var i = 0; i < w; i++) {
                var k = w32 * j + (i >> 5),
                    m = pixels[((y + j) * (this.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);
    }
}
getContext() {
    let canvas = document.createElement('canvas');
    canvas.width = canvas.height = 1;
    let ratio = Math.sqrt(canvas.getContext("2d").getImageData(0, 0, 1, 1).data.length >> 2);
    canvas.width = (this.cw << 5) / ratio;
    canvas.height = this.ch / ratio;
    let ctx = canvas.getContext('2d');
    ctx.fillStyle = ctx.strokeStyle = "red";
    ctx.textAlign = "center";
    return { context: ctx, ratio: ratio };
}

archimedeanSpiral(size) {
    var e = size[0] / size[1];
    return function(t) {
        return [
            e * (t *= .1) * Math.cos(t),
            t * Math.sin(t)
        ];
    };
}

rectangularSpiral(size) {
    var dy = 4,
        dx = dy * size[0] / size[1],
        x = 0,
        y = 0;
    return function(t) {
        var 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];
    };
}

cloudCollide(tag, board, sw) {
    sw >>= 5;
    var sprite = tag.sprite,
        w = tag.width >> 5,
        lx = tag.x - (w << 4),
        sx = lx & 0x7f,
        msx = 32 - sx,
        h = tag.y1 - tag.y0,
        x = (tag.y + tag.y0) * sw + (lx >> 5),
        last;
    for (var j = 0; j < h; j++) {
        last = 0;
        for (var 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;
}

collideRects(a, b) {
    var coll = 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;
    return coll;
}

place(board, tag, bounds): boolean {
    var perimeter = [{ x: 0, y: 0 }, { x: this.size[0], y: this.size[1] }],
        startX = tag.x,
        startY = tag.y,
        maxDelta = Math.sqrt(this.size[0] * this.size[0] + this.size[1] * this.size[1]),
        s = this.archimedeanSpiral(this.size),
        // dt = Math.random() < .5 ? 1 : -1,
        dt = 1,
        t = -dt,
        dxdy,
        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 > this.size[0] || tag.y + tag.y1 > this.size[1]) continue;
        // TODO only check for collisions within current bounds.

        if (!bounds || !this.cloudCollide(tag, board, this.size[0])) {
            if (!bounds || this.collideRects(tag, bounds)) {
                var sprite = tag.sprite,
                    w = tag.width >> 5,
                    sw = this.size[0] >> 5,
                    lx = tag.x - (w << 4),
                    sx = lx & 0x7f,
                    msx = 32 - sx,
                    h = tag.y1 - tag.y0,
                    x = (tag.y + tag.y0) * sw + (lx >> 5),
                    last;
                for (var j = 0; j < h; j++) {
                    last = 0;
                    for (var 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;
}

cloudBounds(bounds, d) {
    var 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;
}

zeroArray(n) {
    var a = [],
        i = -1;
    while (++i < n) a[i] = 0;
    return a;
}

} `

[michaelByrne]

I'm going to close this and reopen a pull request when I have this finished.