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function WordCloud(wdata, laySize) {
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var cloudRadians = Math.PI / 180,
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cw = 1 << 11 >> 5,
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ch = 1 << 11;
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let data = wdata
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let words = wdata
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let canvas = cloudCanvas
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let random = Math.random
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let size = laySize
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let spiral = archimedeanSpiral
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step()
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function zeroArray(n) {
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var a = [],
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i = -1;
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while (++i < n) a[i] = 0;
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return a;
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}
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function step() {
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var contextAndRatio = getContext(canvas()),
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board = zeroArray((size[0] >> 5) * size[1]),
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bounds = null,
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n = words.length,
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i = 0,
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tags = []
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for (i; i < n; i++) {
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var d = data[i];
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d.x = (size[0] * (random() + .5)) >> 1;
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d.y = (size[1] * (random() + .5)) >> 1;
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cloudSprite(contextAndRatio, d, data, i);
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if (d.hasText && place(board, d, bounds)) {
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tags.push(d);
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if (bounds) cloudBounds(bounds, d);
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else bounds = [{ x: d.x + d.x0, y: d.y + d.y0 }, { x: d.x + d.x1, y: d.y + d.y1 }];
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// Temporary hack
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d.x -= size[0] >> 1;
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d.y -= size[1] >> 1;
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}
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}
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}
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function cloudCanvas() {
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return document.createElement("canvas");
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}
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function getContext(canvas) {
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canvas.width = canvas.height = 1;
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var ratio = Math.sqrt(canvas.getContext("2d").getImageData(0, 0, 1, 1).data.length >> 2);
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canvas.width = (cw << 5) / ratio;
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canvas.height = ch / ratio;
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var context = canvas.getContext("2d");
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context.fillStyle = context.strokeStyle = "red";
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context.textAlign = "center";
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return { context: context, ratio: ratio };
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}
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function cloudSprite(contextAndRatio, d, data, di) {
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if (d.sprite) return;
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var c = contextAndRatio.context,
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ratio = contextAndRatio.ratio;
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c.clearRect(0, 0, (cw << 5) / ratio, ch / ratio);
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var x = 0,
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y = 0,
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maxh = 0,
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n = data.length;
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--di;
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while (++di < n) {
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d = data[di];
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c.save();
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// c.font = ~~((d.size + 1) / ratio) + "px " + (d.font || "Arial");
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c.font = `${(((d.size) / ratio))}px ${(d.font || "Arial")}`
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var w = c.measureText(d.text + "m").width * ratio,
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h = d.size << 1;
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if (d.rotate) {
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var sr = Math.sin(d.rotate * cloudRadians),
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cr = Math.cos(d.rotate * cloudRadians),
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wcr = w * cr,
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wsr = w * sr,
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hcr = h * cr,
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hsr = h * sr;
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w = (Math.max(Math.abs(wcr + hsr), Math.abs(wcr - hsr)) + 0x1f) >> 5 << 5;
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h = ~~Math.max(Math.abs(wsr + hcr), Math.abs(wsr - hcr));
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} else {
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w = (w + 0x1f) >> 5 << 5;
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}
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if (h > maxh) maxh = h;
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if (x + w >= (cw << 5)) {
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x = 0;
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y += maxh;
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maxh = 0;
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}
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if (y + h >= ch) break;
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c.translate((x + (w >> 1)) / ratio, (y + (h >> 1)) / ratio);
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if (d.rotate) c.rotate(d.rotate * cloudRadians);
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c.fillText(d.text, 0, 0);
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if (d.padding) c.lineWidth = 2 * d.padding, c.strokeText(d.text, 0, 0);
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c.restore();
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d.width = w;
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d.height = h;
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d.xoff = x;
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d.yoff = y;
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d.x1 = w >> 1;
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d.y1 = h >> 1;
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d.x0 = -d.x1;
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d.y0 = -d.y1;
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d.hasText = true;
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x += w;
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}
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var pixels = c.getImageData(0, 0, (cw << 5) / ratio, ch / ratio).data,
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sprite = [];
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while (--di >= 0) {
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d = data[di];
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if (!d.hasText) continue;
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var w = d.width,
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w32 = w >> 5,
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h = d.y1 - d.y0;
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// Zero the buffer
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for (var i = 0; i < h * w32; i++) sprite[i] = 0;
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x = d.xoff;
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if (x == null) return;
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y = d.yoff;
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var seen = 0,
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seenRow = -1;
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for (var j = 0; j < h; j++) {
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for (var i = 0; i < w; i++) {
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var k = w32 * j + (i >> 5),
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m = pixels[((y + j) * (cw << 5) + (x + i)) << 2] ? 1 << (31 - (i % 32)) : 0;
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sprite[k] |= m;
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seen |= m;
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}
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if (seen) seenRow = j;
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else {
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d.y0++;
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h--;
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j--;
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y++;
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}
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}
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d.y1 = d.y0 + seenRow;
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d.sprite = sprite.slice(0, (d.y1 - d.y0) * w32);
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}
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}
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function place(board, tag, bounds) {
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var perimeter = [{ x: 0, y: 0 }, { x: size[0], y: size[1] }],
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startX = tag.x,
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startY = tag.y,
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maxDelta = Math.sqrt(size[0] * size[0] + size[1] * size[1]),
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s = spiral(size),
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dt = random() < .5 ? 1 : -1,
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t = -dt,
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dxdy,
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dx,
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dy;
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while (dxdy = s(t += dt)) {
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dx = ~~dxdy[0];
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dy = ~~dxdy[1];
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if (Math.min(Math.abs(dx), Math.abs(dy)) >= maxDelta) break;
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tag.x = startX + dx;
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tag.y = startY + dy;
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if (tag.x + tag.x0 < 0 || tag.y + tag.y0 < 0 ||
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tag.x + tag.x1 > size[0] || tag.y + tag.y1 > size[1]) continue;
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// TODO only check for collisions within current bounds.
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if (!bounds || !cloudCollide(tag, board, size[0])) {
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if (!bounds || collideRects(tag, bounds)) {
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var sprite = tag.sprite,
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w = tag.width >> 5,
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sw = size[0] >> 5,
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lx = tag.x - (w << 4),
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sx = lx & 0x7f,
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msx = 32 - sx,
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h = tag.y1 - tag.y0,
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x = (tag.y + tag.y0) * sw + (lx >> 5),
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last;
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for (var j = 0; j < h; j++) {
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last = 0;
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for (var i = 0; i <= w; i++) {
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board[x + i] |= (last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0);
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}
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x += sw;
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}
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delete tag.sprite;
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return true;
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}
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}
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}
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return false;
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}
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function cloudCollide(tag, board, sw) {
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sw >>= 5;
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var sprite = tag.sprite,
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w = tag.width >> 5,
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lx = tag.x - (w << 4),
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sx = lx & 0x7f,
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msx = 32 - sx,
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h = tag.y1 - tag.y0,
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x = (tag.y + tag.y0) * sw + (lx >> 5),
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last;
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for (var j = 0; j < h; j++) {
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last = 0;
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for (var i = 0; i <= w; i++) {
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if (((last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0))
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& board[x + i]) return true;
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}
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x += sw;
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}
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return false;
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}
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function collideRects(a, b) {
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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;
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}
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function cloudBounds(bounds, d) {
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var b0 = bounds[0],
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b1 = bounds[1];
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if (d.x + d.x0 < b0.x) b0.x = d.x + d.x0;
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if (d.y + d.y0 < b0.y) b0.y = d.y + d.y0;
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if (d.x + d.x1 > b1.x) b1.x = d.x + d.x1;
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if (d.y + d.y1 > b1.y) b1.y = d.y + d.y1;
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}
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function archimedeanSpiral(size) {
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var e = size[0] / size[1];
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return function (t) {
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return [e * (t *= .1) * Math.cos(t), t * Math.sin(t)];
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};
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}
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}
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