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(canvas = functor(_), cloud) : canvas;\n };\n\n cloud.start = function() {\n var contextAndRatio = getContext(canvas()),\n board = zeroArray((size[0] >> 5) * size[1]),\n bounds = null,\n n = words.length,\n i = -1,\n tags = [],\n data = words.map(function(d, i) {\n d.text = text.call(this, d, i);\n d.font = font.call(this, d, i);\n d.style = fontStyle.call(this, d, i);\n d.weight = fontWeight.call(this, d, i);\n d.rotate = rotate.call(this, d, i);\n d.size = ~~fontSize.call(this, d, i);\n d.padding = padding.call(this, d, i);\n return d;\n }).sort(function(a, b) { return b.size - a.size; });\n\n if (timer) clearInterval(timer);\n timer = setInterval(step, 0);\n step();\n\n return cloud;\n\n function step() {\n var start = Date.now();\n while (Date.now() - start < timeInterval && ++i < n && timer) {\n var d = data[i];\n d.x = (size[0] * (random() + .5)) >> 1;\n d.y = (size[1] * (random() + .5)) >> 1;\n cloudSprite(contextAndRatio, d, data, i);\n if (d.hasText && place(board, d, bounds)) {\n tags.push(d);\n event.call(\"word\", cloud, d);\n if (bounds) cloudBounds(bounds, d);\n else bounds = [{x: d.x + d.x0, y: d.y + d.y0}, {x: d.x + d.x1, y: d.y + d.y1}];\n // Temporary hack\n d.x -= size[0] >> 1;\n d.y -= size[1] >> 1;\n }\n }\n if (i >= n) {\n cloud.stop();\n event.call(\"end\", cloud, tags, bounds);\n }\n }\n }\n\n cloud.stop = function() {\n if (timer) {\n clearInterval(timer);\n timer = null;\n }\n return cloud;\n };\n\n function getContext(canvas) {\n canvas.width = canvas.height = 1;\n var ratio = Math.sqrt(canvas.getContext(\"2d\").getImageData(0, 0, 1, 1).data.length >> 2);\n canvas.width = (cw << 5) / ratio;\n canvas.height = ch / ratio;\n\n var context = canvas.getContext(\"2d\");\n context.fillStyle = context.strokeStyle = \"red\";\n context.textAlign = \"center\";\n\n return {context: context, ratio: ratio};\n }\n\n function place(board, tag, bounds) {\n var perimeter = [{x: 0, y: 0}, {x: size[0], y: size[1]}],\n startX = tag.x,\n startY = tag.y,\n maxDelta = Math.sqrt(size[0] * size[0] + size[1] * size[1]),\n s = spiral(size),\n dt = random() < .5 ? 1 : -1,\n t = -dt,\n dxdy,\n dx,\n dy;\n\n while (dxdy = s(t += dt)) {\n dx = ~~dxdy[0];\n dy = ~~dxdy[1];\n\n if (Math.min(Math.abs(dx), Math.abs(dy)) >= maxDelta) break;\n\n tag.x = startX + dx;\n tag.y = startY + dy;\n\n if (tag.x + tag.x0 < 0 || tag.y + tag.y0 < 0 ||\n tag.x + tag.x1 > size[0] || tag.y + tag.y1 > size[1]) continue;\n // TODO only check for collisions within current bounds.\n if (!bounds || !cloudCollide(tag, board, size[0])) {\n if (!bounds || collideRects(tag, bounds)) {\n var sprite = tag.sprite,\n w = tag.width >> 5,\n sw = size[0] >> 5,\n lx = tag.x - (w << 4),\n sx = lx & 0x7f,\n msx = 32 - sx,\n h = tag.y1 - tag.y0,\n x = (tag.y + tag.y0) * sw + (lx >> 5),\n last;\n for (var j = 0; j < h; j++) {\n last = 0;\n for (var i = 0; i <= w; i++) {\n board[x + i] |= (last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0);\n }\n x += sw;\n }\n delete tag.sprite;\n return true;\n }\n }\n }\n return false;\n }\n\n cloud.timeInterval = function(_) {\n return arguments.length ? (timeInterval = _ == null ? Infinity : _, cloud) : timeInterval;\n };\n\n cloud.words = function(_) {\n return arguments.length ? (words = _, cloud) : words;\n };\n\n cloud.size = function(_) {\n return arguments.length ? (size = [+_[0], +_[1]], cloud) : size;\n };\n\n cloud.font = function(_) {\n return arguments.length ? (font = functor(_), cloud) : font;\n };\n\n cloud.fontStyle = function(_) {\n return arguments.length ? (fontStyle = functor(_), cloud) : fontStyle;\n };\n\n cloud.fontWeight = function(_) {\n return arguments.length ? (fontWeight = functor(_), cloud) : fontWeight;\n };\n\n cloud.rotate = function(_) {\n return arguments.length ? (rotate = functor(_), cloud) : rotate;\n };\n\n cloud.text = function(_) {\n return arguments.length ? (text = functor(_), cloud) : text;\n };\n\n cloud.spiral = function(_) {\n return arguments.length ? (spiral = spirals[_] || _, cloud) : spiral;\n };\n\n cloud.fontSize = function(_) {\n return arguments.length ? (fontSize = functor(_), cloud) : fontSize;\n };\n\n cloud.padding = function(_) {\n return arguments.length ? (padding = functor(_), cloud) : padding;\n };\n\n cloud.random = function(_) {\n return arguments.length ? (random = _, cloud) : random;\n };\n\n cloud.on = function() {\n var value = event.on.apply(event, arguments);\n return value === event ? cloud : value;\n };\n\n return cloud;\n};\n\nfunction cloudText(d) {\n return d.text;\n}\n\nfunction cloudFont() {\n return \"serif\";\n}\n\nfunction cloudFontNormal() {\n return \"normal\";\n}\n\nfunction cloudFontSize(d) {\n return Math.sqrt(d.value);\n}\n\nfunction cloudRotate() {\n return (~~(Math.random() * 6) - 3) * 30;\n}\n\nfunction cloudPadding() {\n return 1;\n}\n\n// Fetches a monochrome sprite bitmap for the specified text.\n// Load in batches for speed.\nfunction cloudSprite(contextAndRatio, d, data, di) {\n if (d.sprite) return;\n var c = contextAndRatio.context,\n ratio = contextAndRatio.ratio;\n\n c.clearRect(0, 0, (cw << 5) / ratio, ch / ratio);\n var x = 0,\n y = 0,\n maxh = 0,\n n = data.length;\n --di;\n while (++di < n) {\n d = data[di];\n c.save();\n c.font = d.style + \" \" + d.weight + \" \" + ~~((d.size + 1) / ratio) + \"px \" + d.font;\n var w = c.measureText(d.text + \"m\").width * ratio,\n h = d.size << 1;\n if (d.rotate) {\n var sr = Math.sin(d.rotate * cloudRadians),\n cr = Math.cos(d.rotate * cloudRadians),\n wcr = w * cr,\n wsr = w * sr,\n hcr = h * cr,\n hsr = h * sr;\n w = (Math.max(Math.abs(wcr + hsr), Math.abs(wcr - hsr)) + 0x1f) >> 5 << 5;\n h = ~~Math.max(Math.abs(wsr + hcr), Math.abs(wsr - hcr));\n } else {\n w = (w + 0x1f) >> 5 << 5;\n }\n if (h > maxh) maxh = h;\n if (x + w >= (cw << 5)) {\n x = 0;\n y += maxh;\n maxh = 0;\n }\n if (y + h >= ch) break;\n c.translate((x + (w >> 1)) / ratio, (y + (h >> 1)) / ratio);\n if (d.rotate) c.rotate(d.rotate * cloudRadians);\n c.fillText(d.text, 0, 0);\n if (d.padding) c.lineWidth = 2 * d.padding, c.strokeText(d.text, 0, 0);\n c.restore();\n d.width = w;\n d.height = h;\n d.xoff = x;\n d.yoff = y;\n d.x1 = w >> 1;\n d.y1 = h >> 1;\n d.x0 = -d.x1;\n d.y0 = -d.y1;\n d.hasText = true;\n x += w;\n }\n var pixels = c.getImageData(0, 0, (cw << 5) / ratio, ch / ratio).data,\n sprite = [];\n while (--di >= 0) {\n d = data[di];\n if (!d.hasText) continue;\n var w = d.width,\n w32 = w >> 5,\n h = d.y1 - d.y0;\n // Zero the buffer\n for (var i = 0; i < h * w32; i++) sprite[i] = 0;\n x = d.xoff;\n if (x == null) return;\n y = d.yoff;\n var seen = 0,\n seenRow = -1;\n for (var j = 0; j < h; j++) {\n for (var i = 0; i < w; i++) {\n var k = w32 * j + (i >> 5),\n m = pixels[((y + j) * (cw << 5) + (x + i)) << 2] ? 1 << (31 - (i % 32)) : 0;\n sprite[k] |= m;\n seen |= m;\n }\n if (seen) seenRow = j;\n else {\n d.y0++;\n h--;\n j--;\n y++;\n }\n }\n d.y1 = d.y0 + seenRow;\n d.sprite = sprite.slice(0, (d.y1 - d.y0) * w32);\n }\n}\n\n// Use mask-based collision detection.\nfunction cloudCollide(tag, board, sw) {\n sw >>= 5;\n var sprite = tag.sprite,\n w = tag.width >> 5,\n lx = tag.x - (w << 4),\n sx = lx & 0x7f,\n msx = 32 - sx,\n h = tag.y1 - tag.y0,\n x = (tag.y + tag.y0) * sw + (lx >> 5),\n last;\n for (var j = 0; j < h; j++) {\n last = 0;\n for (var i = 0; i <= w; i++) {\n if (((last << msx) | (i < w ? (last = sprite[j * w + i]) >>> sx : 0))\n & board[x + i]) return true;\n }\n x += sw;\n }\n return false;\n}\n\nfunction cloudBounds(bounds, d) {\n var b0 = bounds[0],\n b1 = bounds[1];\n if (d.x + d.x0 < b0.x) b0.x = d.x + d.x0;\n if (d.y + d.y0 < b0.y) b0.y = d.y + d.y0;\n if (d.x + d.x1 > b1.x) b1.x = d.x + d.x1;\n if (d.y + d.y1 > b1.y) b1.y = d.y + d.y1;\n}\n\nfunction collideRects(a, b) {\n 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;\n}\n\nfunction archimedeanSpiral(size) {\n var e = size[0] / size[1];\n return function(t) {\n return [e * (t *= .1) * Math.cos(t), t * Math.sin(t)];\n };\n}\n\nfunction rectangularSpiral(size) {\n var dy = 4,\n dx = dy * size[0] / size[1],\n x = 0,\n y = 0;\n return function(t) {\n var sign = t < 0 ? -1 : 1;\n // See triangular numbers: T_n = n * (n + 1) / 2.\n switch ((Math.sqrt(1 + 4 * sign * t) - sign) & 3) {\n case 0: x += dx; break;\n case 1: y += dy; break;\n case 2: x -= dx; break;\n default: y -= dy; break;\n }\n return [x, y];\n };\n}\n\n// TODO reuse arrays?\nfunction zeroArray(n) {\n var a = [],\n i = -1;\n while (++i < n) a[i] = 0;\n return a;\n}\n\nfunction cloudCanvas() {\n return document.createElement(\"canvas\");\n}\n\nfunction functor(d) {\n return typeof d === \"function\" ? d : function() { return d; };\n}\n\nvar spirals = {\n archimedean: archimedeanSpiral,\n rectangular: rectangularSpiral\n};\n\n},{\"d3-dispatch\":2}],2:[function(require,module,exports){\n// https://d3js.org/d3-dispatch/ Version 1.0.3. Copyright 2017 Mike Bostock.\n(function (global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :\n\ttypeof define === 'function' && define.amd ? define(['exports'], factory) :\n\t(factory((global.d3 = global.d3 || {})));\n}(this, (function (exports) { \n\nvar noop = {value: function() {}};\n\nfunction dispatch() {\n for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {\n if (!(t = arguments[i] + \"\") || (t in _)) throw new Error(\"illegal type: \" + t);\n _[t] = [];\n }\n return new Dispatch(_);\n}\n\nfunction Dispatch(_) {\n this._ = _;\n}\n\nfunction parseTypenames(typenames, types) {\n return typenames.trim().split(/^|\\s+/).map(function(t) {\n var name = \"\", i = t.indexOf(\".\");\n if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);\n if (t && !types.hasOwnProperty(t)) throw new Error(\"unknown type: \" + t);\n return {type: t, name: name};\n });\n}\n\nDispatch.prototype = dispatch.prototype = {\n constructor: Dispatch,\n on: function(typename, callback) {\n var _ = this._,\n T = parseTypenames(typename + \"\", _),\n t,\n i = -1,\n n = T.length;\n\n // If no callback was specified, return the callback of the given type and name.\n if (arguments.length < 2) {\n while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;\n return;\n }\n\n // If a type was specified, set the callback for the given type and name.\n // Otherwise, if a null callback was specified, remove callbacks of the given name.\n if (callback != null && typeof callback !== \"function\") throw new Error(\"invalid callback: \" + callback);\n while (++i < n) {\n if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);\n else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);\n }\n\n return this;\n },\n copy: function() {\n var copy = {}, _ = this._;\n for (var t in _) copy[t] = _[t].slice();\n return new Dispatch(copy);\n },\n call: function(type, that) {\n if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n },\n apply: function(type, that, args) {\n if (!this._.hasOwnProperty(type)) throw new Error(\"unknown type: \" + type);\n for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);\n }\n};\n\nfunction get(type, name) {\n for (var i = 0, n = type.length, c; i < n; ++i) {\n if ((c = type[i]).name === name) {\n return c.value;\n }\n }\n}\n\nfunction set(type, name, callback) {\n for (var i = 0, n = type.length; i < n; ++i) {\n if (type[i].name === name) {\n type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));\n break;\n }\n }\n if (callback != null) type.push({name: name, value: callback});\n return type;\n}\n\nexports.dispatch = dispatch;\n\nObject.defineProperty(exports, '__esModule', { value: true });\n\n})));\n\n},{}]},{},[1])(1)\n});"]}
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