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+// Word cloud layout by Jason Davies, http://www.jasondavies.com/word-cloud/
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+// Algorithm due to Jonathan Feinberg, http://static.mrfeinberg.com/bv_ch03.pdf
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+(function() {
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+ function cloud() {
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+ var size = [256, 256],
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+ text = cloudText,
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+ font = cloudFont,
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+ fontSize = cloudFontSize,
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+ fontStyle = cloudFontNormal,
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+ fontWeight = cloudFontNormal,
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+ rotate = cloudRotate,
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+ padding = cloudPadding,
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+ spiral = archimedeanSpiral,
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+ words = [],
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+ timeInterval = Infinity,
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+ event = d3.dispatch("word", "end"),
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+ timer = null,
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+ cloud = {};
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+
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+ cloud.start = function() {
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+ var 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 = -1,
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+ tags = [],
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+ data = words.map(function(d, i) {
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+ d.text = text.call(this, d, i);
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+ d.font = font.call(this, d, i);
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+ d.style = fontStyle.call(this, d, i);
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+ d.weight = fontWeight.call(this, d, i);
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+ d.rotate = rotate.call(this, d, i);
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+ d.size = ~~fontSize.call(this, d, i);
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+ d.padding = padding.call(this, d, i);
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+ return d;
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+ }).sort(function(a, b) { return b.size - a.size; });
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+
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+ if (timer) clearInterval(timer);
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+ timer = setInterval(step, 0);
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+ step();
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+
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+ return cloud;
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+
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+ function step() {
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+ var start = +new Date,
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+ d;
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+ while (+new Date - start < timeInterval && ++i < n && timer) {
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+ d = data[i];
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+ d.x = (size[0] * (Math.random() + .5)) >> 1;
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+ d.y = (size[1] * (Math.random() + .5)) >> 1;
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+ cloudSprite(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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+ event.word(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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+ if (i >= n) {
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+ cloud.stop();
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+ event.end(tags, bounds);
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+ }
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+ }
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+ }
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+
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+ cloud.stop = function() {
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+ if (timer) {
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+ clearInterval(timer);
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+ timer = null;
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+ }
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+ return cloud;
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+ };
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+
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+ cloud.timeInterval = function(x) {
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+ if (!arguments.length) return timeInterval;
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+ timeInterval = x == null ? Infinity : x;
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+ return cloud;
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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 = Math.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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+
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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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+
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+ if (Math.min(dx, dy) > maxDelta) break;
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+
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+ tag.x = startX + dx;
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+ tag.y = startY + dy;
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+
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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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+
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+ cloud.words = function(x) {
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+ if (!arguments.length) return words;
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+ words = x;
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+ return cloud;
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+ };
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+
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+ cloud.size = function(x) {
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+ if (!arguments.length) return size;
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+ size = [+x[0], +x[1]];
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+ return cloud;
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+ };
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+
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+ cloud.font = function(x) {
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+ if (!arguments.length) return font;
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+ font = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.fontStyle = function(x) {
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+ if (!arguments.length) return fontStyle;
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+ fontStyle = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.fontWeight = function(x) {
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+ if (!arguments.length) return fontWeight;
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+ fontWeight = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.rotate = function(x) {
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+ if (!arguments.length) return rotate;
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+ rotate = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.text = function(x) {
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+ if (!arguments.length) return text;
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+ text = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.spiral = function(x) {
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+ if (!arguments.length) return spiral;
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+ spiral = spirals[x + ""] || x;
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+ return cloud;
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+ };
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+
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+ cloud.fontSize = function(x) {
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+ if (!arguments.length) return fontSize;
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+ fontSize = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ cloud.padding = function(x) {
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+ if (!arguments.length) return padding;
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+ padding = d3.functor(x);
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+ return cloud;
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+ };
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+
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+ return d3.rebind(cloud, event, "on");
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+ }
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+
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+ function cloudText(d) {
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+ return d.text;
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+ }
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+
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+ function cloudFont() {
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+ return "serif";
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+ }
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+
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+ function cloudFontNormal() {
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+ return "normal";
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+ }
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+
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+ function cloudFontSize(d) {
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+ return Math.sqrt(d.value);
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+ }
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+
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+ function cloudRotate() {
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+ return (~~(Math.random() * 6) - 3) * 30;
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+ }
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+
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+ function cloudPadding() {
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+ return 1;
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+ }
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+
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+ // Fetches a monochrome sprite bitmap for the specified text.
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+ // Load in batches for speed.
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+ function cloudSprite(d, data, di) {
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+ if (d.sprite) return;
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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.style + " " + d.weight + " " + ~~((d.size + 1) / ratio) + "px " + d.font;
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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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+
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+ // Use mask-based collision detection.
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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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+
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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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+
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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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+
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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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+ function rectangularSpiral(size) {
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+ var dy = 4,
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+ dx = dy * size[0] / size[1],
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+ x = 0,
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+ y = 0;
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+ return function(t) {
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+ var sign = t < 0 ? -1 : 1;
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+ // See triangular numbers: T_n = n * (n + 1) / 2.
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+ switch ((Math.sqrt(1 + 4 * sign * t) - sign) & 3) {
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+ case 0: x += dx; break;
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+ case 1: y += dy; break;
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+ case 2: x -= dx; break;
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+ default: y -= dy; break;
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+ }
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+ return [x, y];
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+ };
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+ }
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+
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+ // TODO reuse arrays?
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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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+
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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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+ canvas,
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+ ratio = 1;
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+
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+ if (typeof document !== "undefined") {
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+ canvas = document.createElement("canvas");
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+ canvas.width = 1;
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+ canvas.height = 1;
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+ 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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+ } else {
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+ // Attempt to use node-canvas.
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+ canvas = new Canvas(cw << 5, ch);
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+ }
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+
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+ var c = canvas.getContext("2d"),
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+ spirals = {
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+ archimedean: archimedeanSpiral,
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+ rectangular: rectangularSpiral
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+ };
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+ c.fillStyle = c.strokeStyle = "red";
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+ c.textAlign = "center";
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+
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+ if (typeof module === "object" && module.exports) module.exports = cloud;
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+ else (d3.layout || (d3.layout = {})).cloud = cloud;
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+})();
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