d3Cloud2 = { var cloudRadians = Math.PI / 180, cw = (1 << 11) >> 5, ch = 1 << 11; var spirals = { archimedean: archimedeanSpiral, rectangular: rectangularSpiral }; return function () { var size = [256, 256], text = cloudText, font = cloudFont, fontSize = cloudFontSize, fontStyle = cloudFontNormal, fontWeight = cloudFontNormal, rotate = cloudRotate, padding = cloudPadding, spiral = archimedeanSpiral, words = [], timeInterval = Infinity, event = dispatch("word", "end"), timer = null, random = Math.random, cloud = {}, canvas = cloudCanvas; cloud.canvas = function (_) { return arguments.length ? ((canvas = functor(_)), cloud) : canvas; }; cloud.start = function () { var contextAndRatio = getContext(canvas()), board = zeroArray((size[0] >> 5) * size[1]), bounds = null, n = words.length, i = -1, tags = [], data = words .map(function (d, i) { d.text = text.call(this, d, i); d.font = font.call(this, d, i); d.style = fontStyle.call(this, d, i); d.weight = fontWeight.call(this, d, i); d.rotate = rotate.call(this, d, i); d.size = ~~fontSize.call(this, d, i); d.padding = padding.call(this, d, i); return d; }) .sort(function (a, b) { return b.size - a.size; }); if (timer) clearInterval(timer); timer = setInterval(step, 0); step(); return cloud; function step() { var start = Date.now(); while (Date.now() - start < timeInterval && ++i < n && timer) { var d = data[i]; d.x = (size[0] * (random() + 0.5)) >> 1; d.y = (size[1] * (random() + 0.5)) >> 1; cloudSprite(contextAndRatio, d, data, i); if (d.hasText && place(board, d, bounds)) { tags.push(d); event.call("word", cloud, d); if (bounds) 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; } } if (i >= n) { cloud.stop(); event.call("end", cloud, tags, bounds); } } }; cloud.stop = function () { if (timer) { clearInterval(timer); timer = null; } return cloud; }; function getContext(canvas) { canvas.width = canvas.height = 1; var ratio = Math.sqrt( canvas.getContext("2d").getImageData(0, 0, 1, 1).data.length >> 2 ); canvas.width = (cw << 5) / ratio; canvas.height = ch / ratio; var context = canvas.getContext("2d"); context.fillStyle = context.strokeStyle = "red"; context.textAlign = "center"; return { context: context, ratio: ratio }; } function place(board, tag, bounds) { var perimeter = [ { x: 0, y: 0 }, { x: size[0], y: size[1] } ], 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, 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 > 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)) { var 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, 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; } cloud.timeInterval = function (_) { return arguments.length ? ((timeInterval = _ == null ? Infinity : _), cloud) : timeInterval; }; cloud.words = function (_) { return arguments.length ? ((words = _), cloud) : words; }; cloud.size = function (_) { return arguments.length ? ((size = [+_[0], +_[1]]), cloud) : size; }; cloud.font = function (_) { return arguments.length ? ((font = functor(_)), cloud) : font; }; cloud.fontStyle = function (_) { return arguments.length ? ((fontStyle = functor(_)), cloud) : fontStyle; }; cloud.fontWeight = function (_) { return arguments.length ? ((fontWeight = functor(_)), cloud) : fontWeight; }; cloud.rotate = function (_) { return arguments.length ? ((rotate = functor(_)), cloud) : rotate; }; cloud.text = function (_) { return arguments.length ? ((text = functor(_)), cloud) : text; }; cloud.spiral = function (_) { return arguments.length ? ((spiral = spirals[_] || _), cloud) : spiral; }; cloud.fontSize = function (_) { return arguments.length ? ((fontSize = functor(_)), cloud) : fontSize; }; cloud.padding = function (_) { return arguments.length ? ((padding = functor(_)), cloud) : padding; }; cloud.random = function (_) { return arguments.length ? ((random = _), cloud) : random; }; cloud.on = function () { var value = event.on.apply(event, arguments); return value === event ? cloud : value; }; return cloud; }; function cloudText(d) { return d.text; } function cloudFont() { return "serif"; } function cloudFontNormal() { return "normal"; } function cloudFontSize(d) { return Math.sqrt(d.value); } function cloudRotate() { return (~~(Math.random() * 6) - 3) * 30; } function cloudPadding() { return 1; } // Fetches a monochrome sprite bitmap for the specified text. // Load in batches for speed. function cloudSprite(contextAndRatio, d, data, di) { if (d.sprite) return; var c = contextAndRatio.context, ratio = contextAndRatio.ratio; c.clearRect(0, 0, (cw << 5) / ratio, ch / ratio); var 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) { var 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; } var pixels = c.getImageData(0, 0, (cw << 5) / ratio, ch / ratio).data, sprite = []; while (--di >= 0) { d = data[di]; if (!d.hasText) continue; var w = d.width, w32 = w >> 5, 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) * (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; 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; } function 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; } 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) { var e = size[0] / size[1]; return function (t) { return [e * (t *= 0.1) * Math.cos(t), t * Math.sin(t)]; }; } function 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]; }; } // TODO reuse arrays? function zeroArray(n) { var a = [], 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; }; } }