@antv/g2plot
Version:
An interactive and responsive charting library
419 lines • 13.8 kB
JavaScript
import { assign, isFunction, isNil } from '@antv/util';
var DEFAULT_OPTIONS = {
font: function () { return 'serif'; },
padding: 1,
size: [500, 500],
spiral: 'archimedean',
// timeInterval: Infinity // max execute time
timeInterval: 3000, // max execute time
// imageMask: '', // instance of Image, must be loaded
};
/**
* 根据对应的数据对象，计算每个
* 词语在画布中的渲染位置，并返回
* 计算后的数据对象
* @param words
* @param options
*/
export function wordCloud(words, options) {
// 混入默认配置
options = assign({}, DEFAULT_OPTIONS, options);
return transform(words, options);
}
/**
* 抛出没有混入默认配置的方法，用于测试。
* @param words
* @param options
*/
export function transform(words, options) {
// 布局对象
var layout = tagCloud();
['font', 'fontSize', 'fontWeight', 'padding', 'rotate', 'size', 'spiral', 'timeInterval', 'random'].forEach(function (key) {
if (!isNil(options[key])) {
layout[key](options[key]);
}
});
layout.words(words);
if (options.imageMask) {
layout.createMask(options.imageMask);
}
var result = layout.start();
var tags = result._tags;
tags.forEach(function (tag) {
tag.x += options.size[0] / 2;
tag.y += options.size[1] / 2;
});
var _a = options.size, w = _a[0], h = _a[1];
// 添加两个参照数据，分别表示左上角和右下角。
// 不添加的话不会按照真实的坐标渲染，而是以
// 数据中的边界坐标为边界进行拉伸，以铺满画布。
// 这样的后果会导致词语之间的重叠。
tags.push({
text: '',
value: 0,
x: 0,
y: 0,
opacity: 0,
});
tags.push({
text: '',
value: 0,
x: w,
y: h,
opacity: 0,
});
return tags;
}
var cloudRadians = Math.PI / 180, cw = (1 << 11) >> 5, ch = 1 << 11;
function cloudText(d) {
return d.text;
}
function cloudFont() {
return 'serif';
}
function cloudFontNormal() {
return 'normal';
}
function cloudFontSize(d) {
return d.value;
}
function cloudRotate() {
return ~~(Math.random() * 2) * 90;
}
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;
var 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;
var 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;
var 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];
var 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 = [];
var i = -1;
while (++i < n)
a[i] = 0;
return a;
}
function cloudCanvas() {
return document.createElement('canvas');
}
export function functor(d) {
return isFunction(d)
? d
: function () {
return d;
};
}
var spirals = {
archimedean: archimedeanSpiral,
rectangular: rectangularSpiral,
};
function tagCloud() {
var size = [256, 256], font = cloudFont, fontSize = cloudFontSize, fontWeight = cloudFontNormal, rotate = cloudRotate, padding = cloudPadding, spiral = archimedeanSpiral, random = Math.random, words = [], timeInterval = Infinity;
var text = cloudText;
var fontStyle = cloudFontNormal;
var canvas = cloudCanvas;
var cloud = {};
cloud.start = function () {
var width = size[0], height = size[1];
var contextAndRatio = getContext(canvas()), board = cloud.board ? cloud.board : zeroArray((size[0] >> 5) * size[1]), n = words.length, tags = [], data = words
.map(function (d, i, data) {
d.text = text.call(this, d, i, data);
d.font = font.call(this, d, i, data);
d.style = fontStyle.call(this, d, i, data);
d.weight = fontWeight.call(this, d, i, data);
d.rotate = rotate.call(this, d, i, data);
d.size = ~~fontSize.call(this, d, i, data);
d.padding = padding.call(this, d, i, data);
return d;
})
.sort(function (a, b) {
return b.size - a.size;
});
var i = -1, bounds = !cloud.board
? null
: [
{
x: 0,
y: 0,
},
{
x: width,
y: height,
},
];
step();
function step() {
var start = Date.now();
while (Date.now() - start < timeInterval && ++i < n) {
var d = data[i];
d.x = (width * (random() + 0.5)) >> 1;
d.y = (height * (random() + 0.5)) >> 1;
cloudSprite(contextAndRatio, d, data, i);
if (d.hasText && place(board, d, bounds)) {
tags.push(d);
if (bounds) {
if (!cloud.hasImage) {
// update bounds if image mask not set
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;
}
}
cloud._tags = tags;
cloud._bounds = bounds;
}
return cloud;
};
function getContext(canvas) {
canvas.width = canvas.height = 1;
var ratio = Math.sqrt(canvas.getContext('2d', { willReadFrequently: true }).getImageData(0, 0, 1, 1).data
.length >> 2);
canvas.width = (cw << 5) / ratio;
canvas.height = ch / ratio;
var context = canvas.getContext('2d', { willReadFrequently: true });
context.fillStyle = context.strokeStyle = 'red';
context.textAlign = 'center';
return { context: context, ratio: ratio };
}
function place(board, tag, bounds) {
// const perimeter = [{ x: 0, y: 0 }, { x: size[0], y: size[1] }],
var 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;
var dxdy, t = -dt, 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;
var last = void 0, x = (tag.y + tag.y0) * sw + (lx >> 5);
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.createMask = function (img) {
var can = document.createElement('canvas');
var width = size[0], height = size[1];
// 当 width 或 height 为 0 时，调用 cxt.getImageData 会报错
if (!width || !height) {
return;
}
var w32 = width >> 5;
var board = zeroArray((width >> 5) * height);
can.width = width;
can.height = height;
var cxt = can.getContext('2d');
cxt.drawImage(img, 0, 0, img.width, img.height, 0, 0, width, height);
var imageData = cxt.getImageData(0, 0, width, height).data;
for (var j = 0; j < height; j++) {
for (var i = 0; i < width; i++) {
var k = w32 * j + (i >> 5);
var tmp = (j * width + i) << 2;
var flag = imageData[tmp] >= 250 && imageData[tmp + 1] >= 250 && imageData[tmp + 2] >= 250;
var m = flag ? 1 << (31 - (i % 32)) : 0;
board[k] |= m;
}
}
cloud.board = board;
cloud.hasImage = true;
};
cloud.timeInterval = function (_) {
timeInterval = _ == null ? Infinity : _;
};
cloud.words = function (_) {
words = _;
};
cloud.size = function (_) {
size = [+_[0], +_[1]];
};
cloud.font = function (_) {
font = functor(_);
};
cloud.fontWeight = function (_) {
fontWeight = functor(_);
};
cloud.rotate = function (_) {
rotate = functor(_);
};
cloud.spiral = function (_) {
spiral = spirals[_] || _;
};
cloud.fontSize = function (_) {
fontSize = functor(_);
};
cloud.padding = function (_) {
padding = functor(_);
};
cloud.random = function (_) {
random = functor(_);
};
return cloud;
}
//# sourceMappingURL=word-cloud.js.map