mirror of
https://github.com/Jermolene/TiddlyWiki5
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402 lines
11 KiB
JavaScript
402 lines
11 KiB
JavaScript
// 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(exports) {
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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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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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if (timer) clearInterval(timer);
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timer = setInterval(step, 0);
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step();
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return cloud;
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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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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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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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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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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(dx, 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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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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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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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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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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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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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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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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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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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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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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return d3.rebind(cloud, event, "on");
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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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function cloudFont() {
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return "serif";
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}
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function cloudFontNormal() {
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return "normal";
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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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function cloudRotate() {
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return (~~(Math.random() * 6) - 3) * 30;
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}
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function cloudPadding() {
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return 1;
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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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// 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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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 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 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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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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// 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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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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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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// node-canvas support
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var Canvas = require("canvas");
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canvas = new Canvas(cw << 5, ch);
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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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exports.cloud = cloud;
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})(typeof exports === "undefined" ? d3.layout || (d3.layout = {}) : exports);
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