-
Notifications
You must be signed in to change notification settings - Fork 216
/
diagram.js
416 lines (367 loc) · 14.8 KB
/
diagram.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
(function(venn) {
"use strict";
venn.VennDiagram = function() {
var width = 600,
height = 350,
padding = 15,
duration = 1000,
orientation = Math.PI / 2,
normalize = true,
fontSize = null,
colours = d3.scale.category10(),
layoutFunction = venn.venn;
function chart(selection) {
selection.each(function(data) {
var solution = layoutFunction(data);
if (normalize) {
solution = venn.normalizeSolution(solution, orientation);
}
var circles = venn.scaleSolution(solution, width, height, padding);
var textCentres = computeTextCentres(circles, data);
// draw out a svg
var svg = d3.select(this).selectAll("svg").data([circles]);
svg.enter().append("svg");
svg.attr("width", width)
.attr("height", height);
// to properly transition intersection areas, we need the
// previous circles locations. load from elements
var previous = {}, hasPrevious = false;
svg.selectAll("g").each(function (d) {
var path = d3.select(this).select("path").attr("d");
if ((d.sets.length == 1) && path) {
hasPrevious = true;
previous[d.sets[0]] = venn.circleFromPath(path);
}
});
// interpolate intersection area paths between previous and
// current paths
var pathTween = function(d) {
return function(t) {
var c = d.sets.map(function (set) {
var start = previous[set], end = circles[set];
if (!start) {
start = {x : width/2, y : height/2, radius : 1};
}
if (!end) {
end = {x : width/2, y : height/2, radius : 1};
}
return {'x' : start.x * (1 - t) + end.x * t,
'y' : start.y * (1 - t) + end.y * t,
'radius' : start.radius * (1 - t) + end.radius * t};
});
return venn.intersectionAreaPath(c);
};
};
// update data, joining on the set ids
var nodes = svg.selectAll("g")
.data(data, function(d) { return d.sets; });
// create new nodes
var enter = nodes.enter()
.append('g')
.attr("class", function(d) {
return "venn-area venn-" +
(d.sets.length == 1 ? "circle" : "intersection") +
(" venn-sets-" + d.sets.join("_"));
});
enter.append("path")
.style("fill-opacity", "0")
.filter(function (d) { return d.sets.length == 1; } )
.style("fill", function(d) { return colours(label(d)); })
.style("fill-opacity", ".25");
var enterText = enter.append("text")
.style("fill", function(d) { return d.sets.length == 1 ? colours(label(d)) : "#444"; })
.text(function (d) { return label(d); } )
.attr("text-anchor", "middle")
.attr("dy", ".35em")
.attr("x", width/2)
.attr("y", height/2);
// update existing
var update = nodes.transition("venn").duration(hasPrevious ? duration : 0);
update.select("path")
.attrTween("d", pathTween);
var updateText = update.select("text")
.text(function (d) { return label(d); } )
.each("end", venn.wrapText(circles, label))
.attr("x", function(d) {
return Math.floor(textCentres[d.sets].x);
})
.attr("y", function(d) {
return Math.floor(textCentres[d.sets].y);
});
// if we've been passed a fontSize explicitly, use it to
// transition
if (fontSize !== null) {
enterText.style("font-size", "0px");
updateText.style("font-size", fontSize);
}
// remove old
var remove = nodes.exit().transition('venn').duration(duration).remove();
remove.select("path")
.attrTween("d", pathTween);
remove.select("text")
.text(function (d) { return label(d); } )
.attr("x", width/2)
.attr("y", height/2)
.style("font-size", "0px");
});
}
function label(d) {
if (d.label) {
return d.label;
}
if (d.sets.length == 1) {
return '' + d.sets[0];
}
}
chart.width = function(_) {
if (!arguments.length) return width;
width = _;
return chart;
};
chart.height = function(_) {
if (!arguments.length) return height;
height = _;
return chart;
};
chart.padding = function(_) {
if (!arguments.length) return padding;
padding = _;
return chart;
};
chart.colours = function(_) {
if (!arguments.length) return colours;
colours = _;
return chart;
};
chart.fontSize = function(_) {
if (!arguments.length) return fontSize;
fontSize = _;
return chart;
};
chart.duration = function(_) {
if (!arguments.length) return duration;
duration = _;
return chart;
};
chart.layoutFunction = function(_) {
if (!arguments.length) return layoutFunction;
layoutFunction = _;
return chart;
};
chart.normalize = function(_) {
if (!arguments.length) return normalize;
normalize = _;
return chart;
};
chart.orientation = function(_) {
if (!arguments.length) return orientation;
orientation = _;
return chart;
};
return chart;
};
// sometimes text doesn't fit inside the circle, if thats the case lets wrap
// the text here such that it fits
// todo: looks like this might be merged into d3 (
// https://github.com/mbostock/d3/issues/1642),
// also worth checking out is
// http://engineering.findthebest.com/wrapping-axis-labels-in-d3-js/
// this seems to be one of those things that should be easy but isn't
venn.wrapText = function(circles, labeller) {
return function() {
var text = d3.select(this),
data = text.datum(),
width = circles[data.sets[0]].radius || 50,
label = labeller(data) || '';
var words = label.split(/\s+/).reverse(),
maxLines = 3,
minChars = (label.length + words.length) / maxLines,
word = words.pop(),
line = [word],
joined,
lineNumber = 0,
lineHeight = 1.1, // ems
tspan = text.text(null).append("tspan").text(word);
while (true) {
word = words.pop();
if (!word) break;
line.push(word);
joined = line.join(" ");
tspan.text(joined);
if (joined.length > minChars && tspan.node().getComputedTextLength() > width) {
line.pop();
tspan.text(line.join(" "));
line = [word];
tspan = text.append("tspan").text(word);
lineNumber++;
}
}
var initial = 0.35 - lineNumber * lineHeight / 2,
x = text.attr("x"),
y = text.attr("y");
text.selectAll("tspan")
.attr("x", x)
.attr("y", y)
.attr("dy", function(d, i) {
return (initial + i * lineHeight) + "em";
});
};
};
function circleMargin(current, interior, exterior) {
var margin = interior[0].radius - venn.distance(interior[0], current), i, m;
for (i = 1; i < interior.length; ++i) {
m = interior[i].radius - venn.distance(interior[i], current);
if (m <= margin) {
margin = m;
}
}
for (i = 0; i < exterior.length; ++i) {
m = venn.distance(exterior[i], current) - exterior[i].radius;
if (m <= margin) {
margin = m;
}
}
return margin;
}
// compute the center of some circles by maximizing the margin of
// the center point relative to the circles (interior) after subtracting
// nearby circles (exterior)
function computeTextCentre(interior, exterior) {
// get an initial estimate by sampling around the interior circles
// and taking the point with the biggest margin
var points = [], i;
for (i = 0; i < interior.length; ++i) {
var c = interior[i];
points.push({x: c.x, y: c.y});
points.push({x: c.x + c.radius/2, y: c.y});
points.push({x: c.x - c.radius/2, y: c.y});
points.push({x: c.x, y: c.y + c.radius/2});
points.push({x: c.x, y: c.y - c.radius/2});
}
var initial = points[0], margin = circleMargin(points[0], interior, exterior);
for (i = 1; i < points.length; ++i) {
var m = circleMargin(points[i], interior, exterior);
if (m >= margin) {
initial = points[i];
margin = m;
}
}
// maximize the margin numerically
var solution = venn.fmin(
function(p) { return -1 * circleMargin({x: p[0], y: p[1]}, interior, exterior); },
[initial.x, initial.y],
{maxIterations:500, minErrorDelta:1e-10}).solution;
var ret = {x: solution[0], y: solution[1]};
// check solution, fallback as needed (happens if fully overlapped
// etc)
var valid = true;
for (i = 0; i < interior.length; ++i) {
if (venn.distance(ret, interior[i]) > interior[i].radius) {
valid = false;
break;
}
}
for (i = 0; i < exterior.length; ++i) {
if (venn.distance(ret, exterior[i]) < exterior[i].radius) {
valid = false;
break;
}
}
if (!valid) {
if (interior.length == 1) {
ret = {x: interior[0].x, y: interior[0].y};
} else {
var areaStats = {};
venn.intersectionArea(interior, areaStats);
if (areaStats.arcs.length === 0) {
ret = {'x': 0, 'y': -1000, disjoint:true};
} else {
// take average of all the points in the intersection
// polygon
ret = venn.getCenter(areaStats.arcs.map(function (a) { return a.p1; }));
}
}
}
return ret;
}
venn.computeTextCentre = computeTextCentre;
function computeTextCentres(circles, areas) {
var ret = {};
for (var i = 0; i < areas.length; ++i) {
var area = areas[i].sets, areaids = {};
for (var j = 0; j < area.length; ++j) {
areaids[area[j]] = true;
}
var interior = [], exterior = [];
for (var setid in circles) {
if (setid in areaids) {
interior.push(circles[setid]);
} else {
exterior.push(circles[setid]);
}
}
var centre = computeTextCentre(interior, exterior);
ret[area] = centre;
if (centre.disjoint && (areas[i].size > 0)) {
console.log("WARNING: area " + area + " not represented on screen");
}
}
return ret;
}
venn.computeTextCentres = computeTextCentres;
// sorts all areas in the venn diagram, so that
// a particular area is on top (relativeTo) - and
// all other areas are so that the smallest areas are on top
venn.sortAreas = function(div, relativeTo) {
// need to sort div's so that Z order is correct
div.selectAll("g").sort(function (a, b) {
// highest order set intersections first
if (a.sets.length != b.sets.length) {
return a.sets.length - b.sets.length;
}
// current element is highest inside its order
if ((a == relativeTo) || (b == relativeTo)) {
return (a == relativeTo) ? 1 : -1;
}
// finally by size
return b.size - a.size;
});
};
venn.circlePath = function(x, y, r) {
var ret = [];
ret.push("\nM", x, y);
ret.push("\nm", -r, 0);
ret.push("\na", r, r, 0, 1, 0, r *2, 0);
ret.push("\na", r, r, 0, 1, 0,-r *2, 0);
return ret.join(" ");
};
// inverse of the circlePath function, returns a circle object from an svg path
venn.circleFromPath = function(path) {
var tokens = path.split(' ');
return {'x' : parseFloat(tokens[1]),
'y' : parseFloat(tokens[2]),
'radius' : -parseFloat(tokens[4])
};
};
/** returns a svg path of the intersection area of a bunch of circles */
venn.intersectionAreaPath = function(circles) {
var stats = {};
venn.intersectionArea(circles, stats);
var arcs = stats.arcs;
if (arcs.length === 0) {
return "M 0 0";
} else if (arcs.length == 1) {
var circle = arcs[0].circle;
return venn.circlePath(circle.x, circle.y, circle.radius);
} else {
// draw path around arcs
var ret = ["\nM", arcs[0].p2.x, arcs[0].p2.y];
for (var i = 0; i < arcs.length; ++i) {
var arc = arcs[i], r = arc.circle.radius, wide = arc.width > r;
ret.push("\nA", r, r, 0, wide ? 1 : 0, 1,
arc.p1.x, arc.p1.y);
}
return ret.join(" ");
}
};
})(venn);