WordStream/lib/d3.layout.wordstream.js at master · iDataVisualizationLab/WordStream

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// Algorithm due to Jonathan Feinberg, http://static.mrfeinberg.com/bv_ch03.pdf

// Also referenced to the implementation: by Jason Davies, https://www.jasondavies.com/wordcloud/

d3.layout.wordStream = function(){

var data = [],

size = [1200, 500],

maxFontSize = 24,

minFontSize = 10,

rotateCorner = 15,

font = "Arial",

flag = "n",

fontScale = d3.scale.linear(),

frequencyScale = d3.scale.linear(),

spiral = achemedeanSpiral,

canvas = cloudCanvas,

interpolation = "linear";

var wordStream = {};

var cloudRadians = Math.PI / 180, toDegree = 180 / Math.PI,

cw = (fileName.indexOf("Quantum")) >= 0 ? 25000 : 1<< 14 ,

ch = 1 << 11;

var maxSud, minSud, maxFreq;

wordStream.boxes = function(){

var boxWidth = size[0]/data.length;

buildFontScale(data);

buildFrequencyScale(data);

var boxes = buildBoxes(data);

//Get the sprite for each word

getImageData(boxes);

//Set for each stream

for(var tc = 0; tc< boxes.topics.length; tc++){

var topic = boxes.topics[tc];

var board = buildBoard(boxes, topic);

var innerBoxes = boxes.innerBoxes[topic];

var layer = boxes.layers[tc];

//Place

for(var bc = 0; bc < boxes.data.length; bc++){

var words = boxes.data[bc].words[topic];

var n = words.length;

var innerBox = innerBoxes[bc];

board.boxWidth = innerBox.width;

board.boxHeight = innerBox.height;

board.boxX = innerBox.x;

board.boxY = innerBox.y;

for(var i = 0; i < n; i++){

place(words[i], board);

}

return boxes;

};

//#region helper functions

function buildFontScale(data){

var topics = d3.keys(data[0].words);

//#region scale for the font size.

var maxSudden = 0;

var minSudden = Number.MAX_SAFE_INTEGER;

var maxFrequency = 0;

var minFrequency = Number.MAX_SAFE_INTEGER;

d3.map(data, function(box){

d3.map(topics, function(topic){

var maxF = d3.max(box.words[topic], function(d){

return d.frequency;

});

var minF = d3.min(box.words[topic], function(d){

return d.frequency;

});

if(maxFrequency < maxF) maxFrequency = maxF;

if(minFrequency > minF) minFrequency = minF;

// ---------------------------------------------

var maxS = d3.max(box.words[topic], function(d){

return d.sudden;

});

var minS = d3.min(box.words[topic], function(d){

return d.sudden;

});

if(maxSudden < maxS) maxSudden = maxS;

if(minSudden > minS) minSudden = minS;

})

});

//fontScale.domain([minFrequency, maxFrequency]).range([minFontSize, maxFontSize]);

maxSud = maxSudden;

minSud = minSudden;

maxFreq = maxFrequency;

fontScale.domain([minSudden, maxSudden]).range([minFontSize, maxFontSize]);

}

function buildFrequencyScale(data){

var totalFrequencies = calculateTotalFrequenciesABox(data);

var max = 0;

d3.map(totalFrequencies, function(d){

var keys = d3.keys(totalFrequencies[0]);

var total = 0;

keys.forEach(key=>{

total += d[key];

});

if(total > max) max = total;

});

frequencyScale.domain([0, max]).range([0, size[1]]);

}

//Convert from data to box

function buildBoxes(data){

//Build settings based on frequencies

var totalFrequencies = calculateTotalFrequenciesABox(data);

var topics = d3.keys(data[0].words);

//#region creating boxes

var numberOfBoxes = data.length;

var boxes = {};

var boxWidth = ~~(size[0]/numberOfBoxes);

//Create the stacked data

var allPoints = [];

topics.forEach(topic=>{

var dataPerTopic = [];

//Push the first point

dataPerTopic.push({x: 0, y:frequencyScale(totalFrequencies[0][topic])});

totalFrequencies.forEach((frq, i) =>{

dataPerTopic.push({x: (i*boxWidth) + (boxWidth>>1), y: frequencyScale(frq[topic])});

});

//Push the last point

dataPerTopic.push({x: size[0], y:frequencyScale(totalFrequencies[totalFrequencies.length-1][topic])});//TODO:

allPoints.push(dataPerTopic);

});

var layers = d3.layout.stack().offset('silhouette')(allPoints);

var innerBoxes = {};

topics.forEach((topic, i)=>{

innerBoxes[topic] = [];

for(var j = 1; j< layers[i].length-1; j 10BC0 ++){

innerBoxes[topic].push({

x: layers[i][j].x - (boxWidth>>1),

y: layers[i][j].y0,

width: boxWidth,

height: layers[i][j].y

});

}

});

boxes = {

topics: topics,

data: data,

layers: layers,

innerBoxes: innerBoxes

};

return boxes;

}

function place(word, board){

var bw = board.width,

bh = board.height,

maxDelta = ~~Math.sqrt((board.boxWidth*board.boxWidth) + (board.boxHeight*board.boxHeight)),

startX = ~~(board.boxX + (board.boxWidth*( Math.random() + .5) >> 1)),

startY = ~~(board.boxY + (board.boxHeight*( Math.random() + .5) >> 1)),

s = spiral([board.boxWidth, board.boxHeight]),

dt = Math.random() < .5 ? 1 : -1,

t = -dt,

dxdy, dx, dy;

word.x = startX;

word.y = startY;

word.placed = false;

while (dxdy = s(t += dt)) {

dx = ~~dxdy[0];

dy = ~~dxdy[1];

if (Math.max(Math.abs(dx), Math.abs(dy)) >= (maxDelta))

break;

word.x = startX + dx;

word.y = startY + dy;

if (word.x + word.x0 < 0 || word.y + word.y0 < 0 || word.x + word.x1 > size[0] || word.y + word.y1 > size[1])

continue;

if(!cloudCollide(word, board)){

placeWordToBoard(word, board);

word.placed = true;

break;

}

//board has current bound + which is placed at the center

//x, y of the word is placed at the center

function cloudCollide(word, board) {

var wh = word.height,

ww = word.width,

bw = board.width;

//For each pixel in word

for(var j = 0; j < wh; j++){

for(var i = 0; i < ww; i++){

var wsi = j*ww + i; //word sprite index;

var wordPixel = word.sprite[wsi];

var bsi = (j+word.y+word.y0)*bw + i+(word.x + word.x0);//board sprite index

var boardPixel = board.sprite[bsi];

if(boardPixel!=0 && wordPixel!=0){

return true;

}

return false;

}

function placeWordToBoard(word, board){

//Add the sprite

var y0 = word.y + word.y0,

x0 = word.x + word.x0,

bw = board.width,

ww = word.width,

wh = word.height;

for(var j=0; j< wh; j++){

for(var i = 0; i< ww; i++){

var wsi = j*ww + i;

var bsi = (j+y0)*bw + i + x0;

if(word.sprite[wsi]!=0) board.sprite[bsi] = word.sprite[wsi];

}

function buildSvg(boxes, topic){

streamPath1 = Array(),

streamPath2 = Array();

var width = size[0],

height = size[1];

var svg = d3.select(document.createElement('svg')).attr({

width: width,

height: height

});

var graphGroup = svg.append('g');

var n = boxes.length;

var catIndex = boxes.topics.indexOf(topic);

var area1 = d3.svg.area()

.interpolate(interpolation)

.x(function(d){return d.x; })

.y0(0)

.y1(function(d){return d.y0; });

var area2 = d3.svg.area()

.interpolate(interpolation)

.x(function(d){return d.x; })

.y0(function(d){return (d.y + d.y0); })

.y1(height);

graphGroup.append('path').datum(boxes.layers[catIndex])

.attr({

d: area1,

stroke: 'red',

'stroke-width': 2,

fill :'red',

id: 'path1'

});

graphGroup.append('path').datum(boxes.layers[catIndex])

.attr({

d: area2,

stroke: 'red',

'stroke-width': 2,

fill :'red',

id: 'path2'

});

return svg;

}

function buildCanvas(boxes, topic){

var svg = buildSvg(boxes, topic);

var path1 = svg.select("#path1").attr('d');

var p2d1 = new Path2D(path1);

var path2 = svg.select("#path2").attr('d');

var p2d2 = new Path2D(path2);

var canvas = document.createElement("canvas");

canvas.width = size[0];

canvas.height = size[1];

var ctx = canvas.getContext('2d');

ctx.fillStyle = 'red';

ctx.fill(p2d1);

ctx.fill(p2d2);

return canvas;

}

function buildBoard(boxes, topic){

var canvas = buildCanvas(boxes,topic);

var width = canvas.width,

height = canvas.height;

var board = {};

board.x = 0;

board.y = 0;

board.width = width;

board.height = height;

var sprite = [];

//initialization

for(var i=0; i< width*height; i++) sprite[i] = 0;

var c = canvas.getContext('2d');

var pixels = c.getImageData(0, 0, width, height).data;

for(var i=0; i< width*height; i++){

sprite[i] = pixels[i<<2];

}

board.sprite = sprite;

return board;

}

function getContext(canvas) {

canvas.width = cw;

canvas.height = ch;

var context = canvas.getContext("2d");

context.fillStyle = context.strokeStyle = "red";

context.textAlign = "center";

context.textBaseline = "middle";

return context;

}

function angle(boxes){

var angles = [];

var y1upper, y2upper, y1lower, y2lower, x;

var angle1, angle2, angle;

var innerBoxes = boxes.innerBoxes;

for (var i = 0; i < d3.keys(innerBoxes).length; i++){ // i: index cua topic

var key = d3.keys(innerBoxes)[i];

for (var j = 0; j < innerBoxes[key].length-1; j++){ // j: index cua doi tuong

x = boxes.innerBoxes[key][j].width;

y1upper = innerBoxes[key][j].y;

y2upper = innerBoxes[key][j+1].y;

y1lower = innerBoxes[key][j].y + innerBoxes[key][j].height;

y2lower = innerBoxes[key][j+1].y + innerBoxes[key][j+1].height;

angle1 = Math.atan2(y1upper - y2upper, x);

angle2 = Math.atan2(y1lower - y2lower, x);

angle = (angle1 + angle2) / 2 * toDegree;

angles.push({

topic: key,

timeStep: j,

angle: angle

});

if (j === innerBoxes[key].length - 2){ // phan tu cuoi

angles.push({

topic: key,

timeStep: j+1,

angle: 0});

}

return angles;

}

//Get image data for all words

function getImageData(boxes){

var av = flag.includes("a")? 15 : 0;

var flow = 0;

var angles = angle(boxes);

var data = boxes.data;

var c = getContext(canvas());

c.clearRect(0, 0, cw, ch);

var x = 0,

y = 0,

maxh = 0;

for(var i = 0; i < data.length; i++){

boxes.topics.forEach(topic =>{

var words = data[i].words[topic];

var n = words.length;

var di=-1;

var d = {};

if (flag.includes("f")){

for (var k in angles){

if ((topic === angles[k].topic) && (i === angles[k].timeStep)){

flow = angles[k].angle;

break;

}

while (++di < n) {

d = words[di];

c.save();

// d.fontSize = ~~fontScale(d.frequency);

d.fontSize = ~~fontScale(d.sudden);

d.rotate = (~~(Math.random() * 4) - 2) * av - flow;

// d.rotate = (~~(Math.random() * 6) - 3) * rotateCorner;

c.font = ~~(d.fontSize + 1) + "px " + font;

var w = ~~(c.measureText(d.text).width),

h = d.fontSize;

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));

h = ~~Math.max(Math.abs(wsr + hcr), Math.abs(wsr - hcr));

}

if (h > maxh) maxh = h;

if (x + w >= cw) {

x = 0;

y += maxh;

maxh = 0;

}

if (y + h >= ch) break;

c.translate((x + (w >> 1)) , (y + (h >> 1)));

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.x = x;

d.y = y;

d.x1 = w>>1;

d.y1 = h>>1;

d.x0 = -d.x1;

d.y0 = -d.y1;

d.timeStep = i;

d.streamHeight = frequencyScale(d.frequency);

x += w;

}

});

}

for(var bc = 0; bc < data.length; bc++){

boxes.topics.forEach(topic=>{

var words = data[bc].words[topic];

var n = words.length;

var di=-1;

var d = {};

while (++di < n) {

d = words[di];

var w = d.width,

h = d.height,

x = d.x,

y = d.y;

var pixels = c.getImageData(d.x, d.y, d.width, d.height).data;

d.sprite = Array();

for(var i = 0; i<<2 < pixels.length; i++){

d.sprite.push(pixels[i<<2]);

}

});

}

//Only return this to test if needed

return c.getImageData(0, 0, cw, ch);

}

function calculateTotalFrequenciesABox(data){

var topics = d3.keys(data[0].words);

var totalFrequenciesABox = Array();

d3.map(data, function(row){

var aBox = {};

topics.forEach(topic =>{

var totalFrequency = 0;

row.words[topic].forEach(element => {

totalFrequency += element.frequency;

});

aBox[topic] = totalFrequency;

});

totalFrequenciesABox.push(aBox);

});

return totalFrequenciesABox;

}

//#endregion

//#region defining the spirals

function achemedeanSpiral(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;

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;

}

};

var spirals = {

achemedean: achemedeanSpiral,

rectangular: rectangularSpiral

}

function cloudCanvas() {

return document.createElement("canvas");

}

//#endregion

//#region exposed methods to test, should be deleted

wordStream.getImageData = getImageData;

wordStream.cloudCollide = cloudCollide;

wordStream.place = place;

wordStream.buildSvg = buildSvg;

wordStream.buildCanvas = buildCanvas;

wordStream.buildBoard = buildBoard;

wordStream.placeWordToBoard = placeWordToBoard;

wordStream.buildBoxes = buildBoxes;

wordStream.buildFontScale = buildFontScale;

//#endregion

//Exporting the functions to set configuration data

//#region setter/getter functions

wordStream.interpolate = function(_){

return arguments.length ? (interpolation = _, wordStream) : interpolation;

}

wordStream.streamPath1 = function(_){

return arguments.length ? (streamPath1 = _, wordStream) : streamPath1;

}

wordStream.streamPath2 = function(_){

return arguments.length ? (streamPath1 = _, wordStream) : streamPath2;

}

wordStream.font = function(_){

return arguments.length ? (font = _, wordStream): font;

}

wordStream.frequencyScale = function(_){

return arguments.length ? (frequencyScale = _, wordStream) : frequencyScale;

}

wordStream.spiral = function(_){

return arguments.length ? (spiral = spirals[_]|| _, wordStream) : spiral;

}

wordStream.data = function(_) {

return arguments.length ? (data = _, wordStream) : data;

};

wordStream.size = function(_){

return arguments.length ? (size = _, wordStream) : size;

};

wordStream.maxFontSize = function(_){

return arguments.length ? (maxFontSize = _, wordStream) : maxFontSize;

};

wordStream.minFontSize = function(_){

return arguments.length ? (minFontSize = _, wordStream) : minFontSize;

};

wordStream.minSud = function (_) {

return arguments.length ? (minSud = _, wordStream) : minSud;

};

wordStream.maxSud = function (_) {

return arguments.length ? (maxSud = _, wordStream) : maxSud;

};

wordStream.minFreq = function (_) {

return arguments.length ? (minFreq = _, wordStream) : minFreq;

};

wordStream.maxFreq = function (_) {

return arguments.length ? (maxFreq = _, wordStream) : maxFreq;

};

wordStream.fontScale = function(_){

return arguments.length ? (fontScale = _, wordStream) : fontScale;

};

wordStream.font = function (_) {

return arguments.length ? (font = _, wordStream) : font;

};

wordStream.flag = function(_){

return arguments.length ? (flag = _, wordStream) : flag;

};

//#endregion

return wordStream;

};

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d3.layout.wordstream.js

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