+++ /dev/null
-// Word cloud layout by Jason Davies, http://www.jasondavies.com/word-cloud/
-// Algorithm due to Jonathan Feinberg, http://static.mrfeinberg.com/bv_ch03.pdf
-(function() {
- function cloud() {
- var size = [256, 256],
- text = cloudText,
- font = cloudFont,
- fontSize = cloudFontSize,
- fontStyle = cloudFontNormal,
- fontWeight = cloudFontNormal,
- rotate = cloudRotate,
- padding = cloudPadding,
- spiral = archimedeanSpiral,
- words = [],
- timeInterval = Infinity,
- event = d3.dispatch("word", "end"),
- timer = null,
- cloud = {};
-
- cloud.start = function() {
- var 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; });
-// createMask();
-/* var bd = 3000;
- while (bd < 4000) {
- board[bd] = -1;
- bd++
- }
- */
- function createMask()
- {
- d3.select("body").append("canvas").attr("id", "maskCanvas")
- maskCanvas = document.getElementById('maskCanvas'),
- maskCanvas.width = 85;
- maskCanvas.height = 85;
- maskContext = maskCanvas.getContext('2d');
- maskImage = new Image();
- maskImage.src = 'mask.png';
- maskImage.onload = function(){
- maskContext.drawImage(maskImage,0,0,85,85 * maskImage.height / maskImage.width);
- maskData = maskContext.getImageData(0,0,85,85).data;
-/*
- var hh = 0;
- while (hh < maskData.length) {
- if (hh%4 == 0) {
- if (maskData[hh] == 0) {
- board[~~(hh/4)] = -1;
- }
- }
- hh++;
- }
- */
-
- }
- }
- if (timer) clearInterval(timer);
- timer = setInterval(step, 0);
- step();
-
- return cloud;
-
- function step() {
- var start = +new Date,
- d;
- while (+new Date - start < timeInterval && ++i < n && timer) {
- d = data[i];
- d.x = (size[0] * (Math.random() + .5)) >> 1;
- d.y = (size[1] * (Math.random() + .5)) >> 1;
- cloudSprite(d, data, i);
- if (d.hasText && place(board, d, bounds)) {
- tags.push(d);
- event.word(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.end(tags, bounds);
- }
- }
- }
-
- cloud.stop = function() {
- if (timer) {
- clearInterval(timer);
- timer = null;
- }
- return cloud;
- };
-
- cloud.timeInterval = function(x) {
- if (!arguments.length) return timeInterval;
- timeInterval = x == null ? Infinity : x;
- return cloud;
- };
-
- 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 = Math.random() < .5 ? 1 : -1,
- t = -dt,
- dxdy,
- dx,
- dy;
-
- while (dxdy = s(t += dt)) {
- dx = ~~dxdy[0];
- dy = ~~dxdy[1];
-
- if (Math.min(dx, 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.words = function(x) {
- if (!arguments.length) return words;
- words = x;
- return cloud;
- };
-
- cloud.size = function(x) {
- if (!arguments.length) return size;
- size = [+x[0], +x[1]];
- return cloud;
- };
-
- cloud.font = function(x) {
- if (!arguments.length) return font;
- font = d3.functor(x);
- return cloud;
- };
-
- cloud.fontStyle = function(x) {
- if (!arguments.length) return fontStyle;
- fontStyle = d3.functor(x);
- return cloud;
- };
-
- cloud.fontWeight = function(x) {
- if (!arguments.length) return fontWeight;
- fontWeight = d3.functor(x);
- return cloud;
- };
-
- cloud.rotate = function(x) {
- if (!arguments.length) return rotate;
- rotate = d3.functor(x);
- return cloud;
- };
-
- cloud.text = function(x) {
- if (!arguments.length) return text;
- text = d3.functor(x);
- return cloud;
- };
-
- cloud.spiral = function(x) {
- if (!arguments.length) return spiral;
- spiral = spirals[x + ""] || x;
- return cloud;
- };
-
- cloud.fontSize = function(x) {
- if (!arguments.length) return fontSize;
- fontSize = d3.functor(x);
- return cloud;
- };
-
- cloud.padding = function(x) {
- if (!arguments.length) return padding;
- padding = d3.functor(x);
- return cloud;
- };
-
- return d3.rebind(cloud, event, "on");
- }
-
- 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(d, data, di) {
- if (d.sprite) return;
- 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 *= .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;
- }
-
- var cloudRadians = Math.PI / 180,
- cw = 1 << 11 >> 5,
- ch = 1 << 11,
- canvas,
- ratio = 1;
-
- if (typeof document !== "undefined") {
- canvas = document.createElement("canvas");
- canvas.width = 1;
- canvas.height = 1;
- ratio = Math.sqrt(canvas.getContext("2d").getImageData(0, 0, 1, 1).data.length >> 2);
- canvas.width = (cw << 5) / ratio;
- canvas.height = ch / ratio;
- } else {
- // Attempt to use node-canvas.
- canvas = new Canvas(cw << 5, ch);
- }
-
- var c = canvas.getContext("2d"),
- spirals = {
- archimedean: archimedeanSpiral,
- rectangular: rectangularSpiral
- };
- c.fillStyle = c.strokeStyle = "red";
- c.textAlign = "center";
-
- if (typeof module === "object" && module.exports) module.exports = cloud;
- else (d3.layout || (d3.layout = {})).cloud = cloud;
-})();
\ No newline at end of file
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