cairo_draw.py 62 KB
Newer Older
Tiago Peixoto's avatar
Tiago Peixoto committed
1
2
3
4
5
#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# graph_tool -- a general graph manipulation python module
#
Tiago Peixoto's avatar
Tiago Peixoto committed
6
# Copyright (C) 2006-2014 Tiago de Paula Peixoto <tiago@skewed.de>
Tiago Peixoto's avatar
Tiago Peixoto committed
7
8
9
10
11
12
13
14
15
16
17
18
19
20
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

21
from __future__ import division, absolute_import, print_function
22
23
24
import sys
if sys.version_info < (3,):
    range = xrange
25

Tiago Peixoto's avatar
Tiago Peixoto committed
26
27
28
29
30
31
import os
import warnings

try:
    import cairo
except ImportError:
32
33
34
    msg = "Error importing cairo. Graph drawing will not work."
    warnings.filterwarnings("always", msg, ImportWarning)
    warnings.warn(msg, ImportWarning)
35
    raise
Tiago Peixoto's avatar
Tiago Peixoto committed
36

Tiago Peixoto's avatar
Tiago Peixoto committed
37
default_cm = None
Tiago Peixoto's avatar
Tiago Peixoto committed
38
try:
39
40
    import matplotlib.artist
    import matplotlib.backends.backend_cairo
41
42
    import matplotlib.cm
    import matplotlib.colors
43
    from matplotlib.cbook import flatten
44
45
46
47
48
49
50
51
52
53
54
55
56
57
    default_clrs = [(0.5529411764705883, 0.8274509803921568, 0.7803921568627451, 1.0),
                    #(1.0, 1.0, 0.7019607843137254, 1.0),
                    (0.7450980392156863, 0.7294117647058823, 0.8549019607843137, 1.0),
                    (0.984313725490196, 0.5019607843137255, 0.4470588235294118, 1.0),
                    (0.5019607843137255, 0.6941176470588235, 0.8274509803921568, 1.0),
                    (0.9921568627450981, 0.7058823529411765, 0.3843137254901961, 1.0),
                    (0.7019607843137254, 0.8705882352941177, 0.4117647058823529, 1.0),
                    (0.9882352941176471, 0.803921568627451, 0.8980392156862745, 1.0),
                    (0.8509803921568627, 0.8509803921568627, 0.8509803921568627, 1.0),
                    (0.7372549019607844, 0.5019607843137255, 0.7411764705882353, 1.0),
                    (0.8, 0.9215686274509803, 0.7725490196078432, 1.0),
                    (1.0, 0.9294117647058824, 0.43529411764705883, 1.0)]
    default_cm = matplotlib.colors.LinearSegmentedColormap.from_list("Set3",
                                                                     default_clrs)
58
    is_draw_inline = 'inline' in matplotlib.get_backend()
Tiago Peixoto's avatar
Tiago Peixoto committed
59
except ImportError:
60
61
62
    msg = "Error importing matplotlib module. Graph drawing will not work."
    warnings.filterwarnings("always", msg, ImportWarning)
    warnings.warn(msg, ImportWarning)
63
    raise
Tiago Peixoto's avatar
Tiago Peixoto committed
64

65
66
try:
    import IPython.display
Tiago Peixoto's avatar
Tiago Peixoto committed
67
except ImportError:
68
69
    pass

Tiago Peixoto's avatar
Tiago Peixoto committed
70
71
72
73
import numpy as np
import gzip
import bz2
import zipfile
74
import copy
75
import io
Tiago Peixoto's avatar
Tiago Peixoto committed
76
77
78
from collections import defaultdict

from .. import GraphView, PropertyMap, ungroup_vector_property,\
79
80
     group_vector_property, _prop, _check_prop_vector

Tiago Peixoto's avatar
Tiago Peixoto committed
81
82
83
from .. stats import label_parallel_edges, label_self_loops

from .. dl_import import dl_import
84
dl_import("from . import libgraph_tool_draw")
Tiago Peixoto's avatar
Tiago Peixoto committed
85
try:
86
    from .libgraph_tool_draw import vertex_attrs, edge_attrs, vertex_shape,\
Tiago Peixoto's avatar
Tiago Peixoto committed
87
88
        edge_marker
except ImportError:
89
90
91
92
    msg = "Error importing cairo-based drawing library. " + \
        "Was graph-tool compiled with cairomm support?"
    warnings.filterwarnings("always", msg, ImportWarning)
    warnings.warn(msg, ImportWarning)
Tiago Peixoto's avatar
Tiago Peixoto committed
93
94
95
96
97
98

from .. draw import sfdp_layout, random_layout, _avg_edge_distance, \
    coarse_graphs

_vdefaults = {
    "shape": "circle",
99
100
    "color": (0.6, 0.6, 0.6, 0.8),
    "fill_color": (0.6470588235294118, 0.058823529411764705, 0.08235294117647059, 0.8),
Tiago Peixoto's avatar
Tiago Peixoto committed
101
    "size": 5,
102
    "aspect": 1.,
103
    "anchor": 1,
Tiago Peixoto's avatar
Tiago Peixoto committed
104
105
106
    "pen_width": 0.8,
    "halo": 0,
    "halo_color": [0., 0., 1., 0.5],
107
    "halo_size": 1.5,
Tiago Peixoto's avatar
Tiago Peixoto committed
108
109
110
    "text": "",
    "text_color": [0., 0., 0., 1.],
    "text_position": -1.,
111
112
    "text_rotation": 0.,
    "text_offset": [0., 0.],
Tiago Peixoto's avatar
Tiago Peixoto committed
113
114
115
    "font_family": "serif",
    "font_slant": cairo.FONT_SLANT_NORMAL,
    "font_weight": cairo.FONT_WEIGHT_NORMAL,
116
    "font_size": 12.,
117
118
    "surface": None,
    "pie_fractions": [0.75, 0.25],
119
    "pie_colors": default_clrs # ('b', 'g', 'r', 'c', 'm', 'y', 'k')
Tiago Peixoto's avatar
Tiago Peixoto committed
120
121
122
    }

_edefaults = {
123
    "color": (0.1796875, 0.203125, 0.2109375, 0.8),
Tiago Peixoto's avatar
Tiago Peixoto committed
124
125
126
127
128
    "pen_width": 1,
    "start_marker": "none",
    "mid_marker": "none",
    "end_marker": "none",
    "marker_size": 4.,
129
    "mid_marker_pos": .5,
Tiago Peixoto's avatar
Tiago Peixoto committed
130
    "control_points": [],
Tiago Peixoto's avatar
Tiago Peixoto committed
131
    "gradient": [],
132
    "dash_style": [],
133
    "text": "",
134
    "text_color": (0., 0., 0., 1.),
135
136
137
138
139
140
    "text_distance": 5,
    "text_parallel": True,
    "font_family": "serif",
    "font_slant": cairo.FONT_SLANT_NORMAL,
    "font_weight": cairo.FONT_WEIGHT_NORMAL,
    "font_size": 12.,
141
    "sloppy": False
Tiago Peixoto's avatar
Tiago Peixoto committed
142
143
144
145
146
147
148
149
150
151
152
153
    }


def shape_from_prop(shape, enum):
    if isinstance(shape, PropertyMap):
        if shape.key_type() == "v":
            prop = shape.get_graph().new_vertex_property("int")
            descs = shape.get_graph().vertices()
        else:
            descs = shape.get_graph().edges()
            prop = shape.get_graph().new_edge_property("int")
        offset = min(enum.values.keys())
154
        vals = dict([(k - offset, v) for k, v in list(enum.values.items())])
Tiago Peixoto's avatar
Tiago Peixoto committed
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
        for v in descs:
            if shape.value_type() == "string":
                prop[v] = int(enum.__dict__[shape[v]])
            elif shape[v] in vals:
                prop[v] = int(vals[shape[v]])
            else:
                prop[v] = int(vals[hash(shape[v]) % len(vals)])
        return prop

    if isinstance(shape, str):
        return int(enum.__dict__[shape])
    else:
        return shape

    raise ValueError("Invalid value for attribute %s: %s" %
                     (repr(enum), repr(shape)))

172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
def open_file(name, mode="r"):
    name = os.path.expanduser(name)
    base, ext = os.path.splitext(name)
    if ext == ".gz":
        out = gzip.GzipFile(name, mode)
        name = base
    elif ext == ".bz2":
        out = bz2.BZ2File(name, mode)
        name = base
    elif ext == ".zip":
        out = zipfile.ZipFile(name, mode)
        name = base
    else:
        out = open(name, mode)
    fmt = os.path.splitext(name)[1].replace(".", "")
187
    return out, fmt
188

189
190
191
192
193
194
195
196
197
198
199
200
def get_file_fmt(name):
    name = os.path.expanduser(name)
    base, ext = os.path.splitext(name)
    if ext == ".gz":
        name = base
    elif ext == ".bz2":
        name = base
    elif ext == ".zip":
        name = base
    fmt = os.path.splitext(name)[1].replace(".", "")
    return fmt

201
202
203
204
205
206
207
208
209
210
211
212
213
214
215

def surface_from_prop(surface):
    if isinstance(surface, PropertyMap):
        if surface.key_type() == "v":
            prop = surface.get_graph().new_vertex_property("object")
            descs = surface.get_graph().vertices()
        else:
            descs = surface.get_graph().edges()
            prop = surface.get_graph().new_edge_property("object")
        surface_map = {}
        for v in descs:
            if surface.value_type() == "string":
                if surface[v] not in surface_map:
                    sfc = gen_surface(surface[v])
                    surface_map[surface[v]] = sfc
216
                prop[v] = surface_map[surface[v]]
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
            elif surface.value_type() == "python::object":
                if isinstance(surface[v], cairo.Surface):
                    prop[v] = surface[v]
                else:
                    raise ValueError("Invalid value type for surface property: " +
                                     str(type(surface[v])))
            else:
                raise ValueError("Invalid value type for surface property: " +
                                 surface.value_type())
        return prop

    if isinstance(surface, str):
        return gen_surface(surface)
    elif isinstance(surface, cairo.Surface) or surface is None:
        return surface

    raise ValueError("Invalid value for attribute surface: " + repr(surface))

Tiago Peixoto's avatar
Tiago Peixoto committed
235
236
237
238

def _convert(attr, val, cmap):
    if attr == vertex_attrs.shape:
        return shape_from_prop(val, vertex_shape)
239
240
    if attr == vertex_attrs.surface:
        return surface_from_prop(val)
Tiago Peixoto's avatar
Tiago Peixoto committed
241
242
243
244
    if attr in [edge_attrs.start_marker, edge_attrs.mid_marker,
                edge_attrs.end_marker]:
        return shape_from_prop(val, edge_marker)

245
246
247
248
    if attr in [vertex_attrs.pie_colors]:
        if isinstance(val, PropertyMap):
            if val.value_type() in ["vector<double>", "vector<long double>"]:
                return val
249
            if val.value_type() in ["vector<int32_t>", "vector<int64_t>", "vector<bool>"]:
250
251
252
253
254
                g = val.get_graph()
                new_val = g.new_vertex_property("vector<double>")
                rg = [float("inf"), -float("inf")]
                for v in g.vertices():
                    for x in val[v]:
255
256
                        rg[0] = min(x, rg[0])
                        rg[1] = max(x, rg[1])
257
258
259
                if rg[0] == rg[1]:
                    rg[1] = 1
                for v in g.vertices():
260
                    new_val[v] = flatten([cmap((x - rg[0]) / (rg[1] - rg[0])) for x in val[v]])
261
                return new_val
262
263
264
265
            if val.value_type() == "vector<string>":
                g = val.get_graph()
                new_val = g.new_vertex_property("vector<double>")
                for v in g.vertices():
266
                    new_val[v] = flatten([matplotlib.colors.ColorConverter().to_rgba(x) for x in val[v]])
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
                return new_val
            if val.value_type() == "python::object":
                try:
                    g = val.get_graph()
                    new_val = g.new_vertex_property("vector<double>")
                    for v in g.vertices():
                        try:
                            new_val[v] = [float(x) for x in flatten(val[v])]
                        except ValueError:
                            new_val[v] = flatten([matplotlib.colors.ColorConverter().to_rgba(x) for x in val[v]])
                    return new_val
                except ValueError:
                    pass
        else:
            try:
                return [float(x) for x in flatten(val)]
            except ValueError:
                try:
                    new_val = flatten(matplotlib.colors.ColorConverter().to_rgba(x) for x in val)
                    return list(new_val)
                except ValueError:
                    pass
Tiago Peixoto's avatar
Tiago Peixoto committed
289
    if attr in [vertex_attrs.color, vertex_attrs.fill_color,
290
                vertex_attrs.text_color, vertex_attrs.halo_color,
291
                edge_attrs.color, edge_attrs.text_color]:
Tiago Peixoto's avatar
Tiago Peixoto committed
292
293
294
295
296
297
298
299
300
301
302
        if isinstance(val, list):
            return val
        if isinstance(val, (tuple, np.ndarray)):
            return list(val)
        if isinstance(val, str):
            return list(matplotlib.colors.ColorConverter().to_rgba(val))
        if isinstance(val, PropertyMap):
            if val.value_type() in ["vector<double>", "vector<long double>"]:
                return val
            if val.value_type() in ["int32_t", "int64_t", "double",
                                    "long double", "unsigned long", "bool"]:
Tiago Peixoto's avatar
Tiago Peixoto committed
303
304
305
                try:
                    vrange = [val.fa.min(), val.fa.max()]
                except ValueError:
Tiago Peixoto's avatar
Tiago Peixoto committed
306
307
308
309
310
                    vrange = val[val.get_graph().vertex(0)]
                    vrange = [vrange, vrange]
                    for v in val.get_graph().vertices():
                        vrange[0] = min(vrange[0], val[v])
                        vrange[1] = max(vrange[1], val[v])
311
                cnorm = matplotlib.colors.Normalize(vmin=vrange[0],
Tiago Peixoto's avatar
Tiago Peixoto committed
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
                                                    vmax=vrange[1])
                if val.key_type() == "v":
                    prop = val.get_graph().new_vertex_property("vector<double>")
                    descs = val.get_graph().vertices()
                else:
                    prop = val.get_graph().new_edge_property("vector<double>")
                    descs = val.get_graph().edges()
                for v in descs:
                    prop[v] = cmap(cnorm(val[v]))
                return prop
            if val.value_type() == "string":
                if val.key_type() == "v":
                    prop = val.get_graph().new_vertex_property("vector<double>")
                    for v in val.get_graph().vertices():
                        prop[v] = matplotlib.colors.ColorConverter().to_rgba(val[v])
                elif val.key_type() == "e":
                    prop = val.get_graph().new_edge_property("vector<double>")
                    for e in val.get_graph().edges():
                        prop[e] = matplotlib.colors.ColorConverter().to_rgba(val[e])
                return prop
        raise ValueError("Invalid value for attribute %s: %s" %
                         (repr(attr), repr(val)))
    return val


def _attrs(attrs, d, g, cmap):
    nattrs = {}
    defaults = {}
340
    for k, v in list(attrs.items()):
Tiago Peixoto's avatar
Tiago Peixoto committed
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
        try:
            if d == "v":
                attr = vertex_attrs.__dict__[k]
            else:
                attr = edge_attrs.__dict__[k]
        except KeyError:
            warnings.warn("Unknown attribute: " + k, UserWarning)
            continue
        if isinstance(v, PropertyMap):
            nattrs[int(attr)] = _prop(d, g, _convert(attr, v, cmap))
        else:
            defaults[int(attr)] = _convert(attr, v, cmap)
    return nattrs, defaults


def get_attr(attr, d, attrs, defaults):
    if attr in attrs:
        p = attrs[attr]
    else:
        p = defaults[attr]
    if isinstance(p, PropertyMap):
        return p[d]
    else:
        return p


367
368
def position_parallel_edges(g, pos, loop_angle=float("nan"),
                            parallel_distance=1):
Tiago Peixoto's avatar
Tiago Peixoto committed
369
370
    lp = label_parallel_edges(GraphView(g, directed=False))
    ll = label_self_loops(g)
371
372
373
374
375
376
    if isinstance(loop_angle, PropertyMap):
        angle = loop_angle
    else:
        angle = g.new_vertex_property("double")
        angle.a = float(loop_angle)

Tiago Peixoto's avatar
Tiago Peixoto committed
377
    g = GraphView(g, directed=True)
378
379
    if ((len(lp.fa) == 0 or lp.fa.max() == 0) and
        (len(ll.fa) == 0 or ll.fa.max() == 0)):
Tiago Peixoto's avatar
Tiago Peixoto committed
380
381
382
383
        return []
    else:
        spline = g.new_edge_property("vector<double>")
        libgraph_tool_draw.put_parallel_splines(g._Graph__graph,
384
                                                _prop("v", g, pos),
Tiago Peixoto's avatar
Tiago Peixoto committed
385
                                                _prop("e", g, lp),
386
                                                _prop("e", g, spline),
387
                                                _prop("v", g, angle),
388
                                                parallel_distance)
Tiago Peixoto's avatar
Tiago Peixoto committed
389
390
391
392
393
394
        return spline


def parse_props(prefix, args):
    props = {}
    others = {}
395
    for k, v in list(args.items()):
Tiago Peixoto's avatar
Tiago Peixoto committed
396
397
398
399
400
401
402
403
        if k.startswith(prefix + "_"):
            props[k.replace(prefix + "_", "")] = v
        else:
            others[k] = v
    return props, others


def cairo_draw(g, pos, cr, vprops=None, eprops=None, vorder=None, eorder=None,
404
405
               nodesfirst=False, vcmap=default_cm,
               ecmap=default_cm, loop_angle=float("nan"),
406
               parallel_distance=None, fit_view=False, **kwargs):
Tiago Peixoto's avatar
Tiago Peixoto committed
407
    r"""
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
    Draw a graph to a :mod:`cairo` context.

    Parameters
    ----------
    g : :class:`~graph_tool.Graph`
        Graph to be drawn.
    pos : :class:`~graph_tool.PropertyMap`
        Vector-valued vertex property map containing the x and y coordinates of
        the vertices.
    cr : :class:`~cairo.Context`
        A :class:`~cairo.Context` instance.
    vprops : dict (optional, default: ``None``)
        Dictionary with the vertex properties. Individual properties may also be
        given via the ``vertex_<prop-name>`` parameters, where ``<prop-name>`` is
        the name of the property.
    eprops : dict (optional, default: ``None``)
        Dictionary with the vertex properties. Individual properties may also be
        given via the ``edge_<prop-name>`` parameters, where ``<prop-name>`` is
        the name of the property.
    vorder : :class:`~graph_tool.PropertyMap` (optional, default: ``None``)
        If provided, defines the relative order in which the vertices are drawn.
    eorder : :class:`~graph_tool.PropertyMap` (optional, default: ``None``)
        If provided, defines the relative order in which the edges are drawn.
    nodesfirst : bool (optional, default: ``False``)
        If ``True``, the vertices are drawn first, otherwise the edges are.
433
    vcmap : :class:`matplotlib.colors.Colormap` (optional, default: :class:`default_cm`)
434
        Vertex color map.
435
    ecmap : :class:`matplotlib.colors.Colormap` (optional, default: :class:`default_cm`)
436
        Edge color map.
437
    loop_angle : float or :class:`~graph_tool.PropertyMap` (optional, default: ``nan``)
438
439
440
441
442
        Angle used to draw self-loops. If ``nan`` is given, they will be placed
        radially from the center of the layout.
    parallel_distance : float (optional, default: ``None``)
        Distance used between parallel edges. If not provided, it will be
        determined automatically.
443
    fit_view : bool or float (optional, default: ``True``)
444
        If ``True``, the layout will be scaled to fit the entire clip region.
445
446
        If a float value is given, it will be interpreted as ``True``, and in
        addition the viewport will be scaled out by that factor.
447
448
    bg_color : str or sequence (optional, default: ``None``)
        Background color. The default is transparent.
449
450
451
452
453
454
455
456
    vertex_* : :class:`~graph_tool.PropertyMap` or arbitrary types (optional, default: ``None``)
        Parameters following the pattern ``vertex_<prop-name>`` specify the
        vertex property with name ``<prop-name>``, as an alternative to the
        ``vprops`` parameter.
    edge_* : :class:`~graph_tool.PropertyMap` or arbitrary types (optional, default: ``None``)
        Parameters following the pattern ``edge_<prop-name>`` specify the edge
        property with name ``<prop-name>``, as an alternative to the ``eprops``
        parameter.
Tiago Peixoto's avatar
Tiago Peixoto committed
457
458
459

    """

460
461
    vprops = {} if vprops is None else copy.copy(vprops)
    eprops = {} if eprops is None else copy.copy(eprops)
Tiago Peixoto's avatar
Tiago Peixoto committed
462
463
464
465
466
467
468
469

    props, kwargs = parse_props("vertex", kwargs)
    vprops.update(props)
    props, kwargs = parse_props("edge", kwargs)
    eprops.update(props)
    for k in kwargs:
        warnings.warn("Unknown parameter: " + k, UserWarning)

470
    cr.save()
471
    if fit_view != False:
472
473
474
475
476
477
478
479
480
481
482
483
        extents = cr.clip_extents()
        output_size = (extents[2] - extents[0], extents[3] - extents[1])
        offset, zoom = fit_to_view(g, pos, output_size,
                                   vprops.get("size", _vdefaults["size"]),
                                   vprops.get("pen_width", _vdefaults["pen_width"]),
                                   None, vprops.get("text", None),
                                   vprops.get("font_family",
                                              _vdefaults["font_family"]),
                                   vprops.get("font_size",
                                              _vdefaults["font_size"]),
                                   cr)
        cr.translate(offset[0], offset[1])
484
485
        if not isinstance(fit_view, bool):
            zoom /= fit_view
486
487
        cr.scale(zoom, zoom)

Tiago Peixoto's avatar
Tiago Peixoto committed
488
    if "control_points" not in eprops:
489
490
491
492
493
494
495
496
497
498
        if parallel_distance is None:
            parallel_distance = vprops.get("size", _vdefaults["size"])
            if isinstance(parallel_distance, PropertyMap):
                parallel_distance = parallel_distance.fa.mean()
            parallel_distance /= 1.5
            M = cr.get_matrix()
            scale = transform_scale(M, 1,)
            parallel_distance /= scale
        eprops["control_points"] = position_parallel_edges(g, pos, loop_angle,
                                                           parallel_distance)
Tiago Peixoto's avatar
Tiago Peixoto committed
499
500
    if g.is_directed() and "end_marker" not in eprops:
        eprops["end_marker"] = "arrow"
501

Tiago Peixoto's avatar
Tiago Peixoto committed
502
503
504
505
506
507
    vattrs, vdefaults = _attrs(vprops, "v", g, vcmap)
    eattrs, edefaults = _attrs(eprops, "e", g, ecmap)
    vdefs = _attrs(_vdefaults, "v", g, vcmap)[1]
    vdefs.update(vdefaults)
    edefs = _attrs(_edefaults, "e", g, ecmap)[1]
    edefs.update(edefaults)
508
509
510
511
512
513
514

    if "control_points" not in eprops:
        if parallel_distance is None:
            parallel_distance = _defaults
        eprops["control_points"] = position_parallel_edges(g, pos, loop_angle,
                                                           parallel_distance)

Tiago Peixoto's avatar
Tiago Peixoto committed
515
516
517
518
    g = GraphView(g, directed=True)
    libgraph_tool_draw.cairo_draw(g._Graph__graph, _prop("v", g, pos),
                                  _prop("v", g, vorder), _prop("e", g, eorder),
                                  nodesfirst, vattrs, eattrs, vdefs, edefs, cr)
519
    cr.restore()
Tiago Peixoto's avatar
Tiago Peixoto committed
520
521


522
523
def color_contrast(color):
    c = np.asarray(color)
524
525
    y = c[0] * .299 + c[1] * .587 + c[2] * .114
    if y < .5:
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
        c[:3] = 1
    else:
        c[:3] = 0
    return c


def auto_colors(g, bg, pos, back):
    c = g.new_vertex_property("vector<double>")
    for v in g.vertices():
        if isinstance(bg, PropertyMap):
            bgc = bg[v]
        elif isinstance(bg, str):
            bgc = matplotlib.colors.ColorConverter().to_rgba(bg)
        else:
            bgc = bg
        if isinstance(pos, PropertyMap):
            p = pos[v]
        else:
            p = pos
        if p < 0:
            c[v] = color_contrast(bgc)
        else:
            c[v] = color_contrast(back)
    return c

Tiago Peixoto's avatar
Tiago Peixoto committed
551
552
def graph_draw(g, pos=None, vprops=None, eprops=None, vorder=None, eorder=None,
               nodesfirst=False, output_size=(600, 600), fit_view=True,
553
               inline=is_draw_inline, mplfig=None, output=None, fmt="auto", **kwargs):
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
    r"""Draw a graph to screen or to a file using :mod:`cairo`.

    Parameters
    ----------
    g : :class:`~graph_tool.Graph`
        Graph to be drawn.
    pos : :class:`~graph_tool.PropertyMap` (optional, default: ``None``)
        Vector-valued vertex property map containing the x and y coordinates of
        the vertices. If not given, it will be computed using :func:`sfdp_layout`.
    vprops : dict (optional, default: ``None``)
        Dictionary with the vertex properties. Individual properties may also be
        given via the ``vertex_<prop-name>`` parameters, where ``<prop-name>`` is
        the name of the property.
    eprops : dict (optional, default: ``None``)
        Dictionary with the vertex properties. Individual properties may also be
        given via the ``edge_<prop-name>`` parameters, where ``<prop-name>`` is
        the name of the property.
    vorder : :class:`~graph_tool.PropertyMap` (optional, default: ``None``)
        If provided, defines the relative order in which the vertices are drawn.
    eorder : :class:`~graph_tool.PropertyMap` (optional, default: ``None``)
        If provided, defines the relative order in which the edges are drawn.
    nodesfirst : bool (optional, default: ``False``)
        If ``True``, the vertices are drawn first, otherwise the edges are.
    output_size : tuple of scalars (optional, default: ``(600,600)``)
        Size of the drawing canvas. The units will depend on the output format
        (pixels for the screen, points for PDF, etc).
    fit_view : bool (optional, default: ``True``)
        If ``True``, the layout will be scaled to fit the entire display area.
582
583
584
    inline : bool (optional, default: ``False``)
        If ``True`` and an `IPython notebook <http://ipython.org/notebook>`_  is
        being used, an inline version of the drawing will be returned.
585
586
587
    mplfig : matplotlib object (optional, default: ``None``)
        The ``mplfig`` needs an artists attribute. This can for example be a
        mpl Figure or Axes. Only the cairo backend is supported, use switch_backend('cairo').
588
589
    output : string or file object (optional, default: ``None``)
        Output file name (or object). If not given, the graph will be displayed via
590
591
592
593
594
        :func:`interactive_window`.
    fmt : string (default: ``"auto"``)
        Output file format. Possible values are ``"auto"``, ``"ps"``, ``"pdf"``,
        ``"svg"``, and ``"png"``. If the value is ``"auto"``, the format is
        guessed from the ``output`` parameter.
595
596
    bg_color : str or sequence (optional, default: ``None``)
        Background color. The default is transparent.
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
    vertex_* : :class:`~graph_tool.PropertyMap` or arbitrary types (optional, default: ``None``)
        Parameters following the pattern ``vertex_<prop-name>`` specify the
        vertex property with name ``<prop-name>``, as an alternative to the
        ``vprops`` parameter.
    edge_* : :class:`~graph_tool.PropertyMap` or arbitrary types (optional, default: ``None``)
        Parameters following the pattern ``edge_<prop-name>`` specify the edge
        property with name ``<prop-name>``, as an alternative to the ``eprops``
        parameter.
    **kwargs
        Any extra parameters are passed to :func:`~graph_tool.draw.interactive_window`,
        :class:`~graph_tool.draw.GraphWindow`, :class:`~graph_tool.draw.GraphWidget`
        and :func:`~graph_tool.draw.cairo_draw`.

    Returns
    -------
    pos : :class:`~graph_tool.PropertyMap`
        Vector vertex property map with the x and y coordinates of the vertices.
    selected : :class:`~graph_tool.PropertyMap` (optional, only if ``output is None``)
        Boolean-valued vertex property map marking the vertices which were
        selected interactively.

    Notes
    -----


    .. table:: **List of vertex properties**

        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | Name          | Description                                       | Accepted types         | Default Value                    |
        +===============+===================================================+========================+==================================+
        | shape         | The vertex shape. Can be one of the following     | ``str`` or ``int``     | ``"circle"``                     |
        |               | strings: "circle", "triangle", "square",          |                        |                                  |
        |               | "pentagon", "hexagon", "heptagon", "octagon"      |                        |                                  |
        |               | "double_circle", "double_triangle",               |                        |                                  |
        |               | "double_square", "double_pentagon",               |                        |                                  |
        |               | "double_hexagon", "double_heptagon",              |                        |                                  |
633
        |               | "double_octagon", "pie".                          |                        |                                  |
634
635
636
637
638
639
640
641
642
643
644
645
646
        |               | Optionally, this might take a numeric value       |                        |                                  |
        |               | corresponding to position in the list above.      |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | color         | Color used to stroke the lines of the vertex.     | ``str`` or list of     | ``[0., 0., 0., 1]``              |
        |               |                                                   | ``floats``             |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | fill_color    | Color used to fill the interior of the vertex.    | ``str`` or list of     | ``[0.640625, 0, 0, 0.9]``        |
        |               |                                                   | ``floats``             |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | size          | The size of the vertex, in the default units of   | ``float`` or ``int``   | ``5``                            |
        |               | the output format (normally either pixels or      |                        |                                  |
        |               | points).                                          |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
647
648
        | aspect        | The aspect ratio of the vertex.                   | ``float`` or ``int``   | ``1.0``                          |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
649
650
651
652
        | anchor        | Specifies how the edges anchor to the vertices.   |  ``int``               | ``1``                            |
        |               | If `0`, the anchor is at the center of the vertex,|                        |                                  |
        |               | otherwise it is at the border.                    |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
653
654
655
656
657
658
659
660
661
662
        | pen_width     | Width of the lines used to draw the vertex, in    | ``float`` or ``int``   | ``0.8``                          |
        |               | the default units of the output format (normally  |                        |                                  |
        |               | either pixels or points).                         |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | halo          | Whether to draw a circular halo around the        | ``bool``               | ``False``                        |
        |               | vertex.                                           |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | halo_color    | Color used to draw the halo.                      | ``str`` or list of     | ``[0., 0., 1., 0.5]``            |
        |               |                                                   | ``floats``             |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
663
664
665
        | halo_size     | Relative size of the halo.                        | ``float``              | ``1.5``                          |
        |               |                                                   |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
666
667
        | text          | Text to draw together with the vertex.            | ``str``                | ``""``                           |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
668
669
670
        | text_color    | Color used to draw the text. If the value is      | ``str`` or list of     | ``"auto"``                       |
        |               | ``"auto"``, it will be computed based on          | ``floats``             |                                  |
        |               | fill_color to maximize contrast.                  |                        |                                  |
671
672
673
674
675
676
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | text_position | Position of the text relative to the vertex.      | ``float`` or ``int``   | ``-1``                           |
        |               | If the passed value is positive, it will          |                        |                                  |
        |               | correspond to an angle in radians, which will     |                        |                                  |
        |               | determine where the text will be placed outside   |                        |                                  |
        |               | the vertex. If the value is negative, the text    |                        |                                  |
677
678
679
        |               | will be placed inside the vertex. If the value is |                        |                                  |
        |               | ``-1``, the vertex size will be automatically     |                        |                                  |
        |               | increased to accommodate the text.                |                        |                                  |
680
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
681
682
683
684
685
686
        | text_offset   | Text position offset.                             | list of ``float``      | ``[0.0, 0.0]``                   |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | text_rotation | Angle of rotation (in radians) for the text.      | ``float``              | ``0.0``                          |
        |               | The center of rotation is the position of the     |                        |                                  |
        |               | vertex.                                           |                        |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
687
688
689
690
691
692
693
694
        | font_family   | Font family used to draw the text.                | ``str``                | ``"serif"``                      |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_slant    | Font slant used to draw the text.                 | ``cairo.FONT_SLANT_*`` | :data:`cairo.FONT_SLANT_NORMAL`  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_weight   | Font weight used to draw the text.                | ``cairo.FONT_WEIGHT_*``| :data:`cairo.FONT_WEIGHT_NORMAL` |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_size     | Font size used to draw the text.                  | ``float`` or ``int``   | ``12``                           |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
695
696
        | surface       | The cairo surface used to draw the vertex. If     | :class:`cairo.Surface` | ``None``                         |
        |               | the value passed is a string, it is interpreted   | or ``str``             |                                  |
Tiago Peixoto's avatar
Tiago Peixoto committed
697
        |               | as an image file name to be loaded.               |                        |                                  |
698
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
699
700
701
702
703
704
        | pie_fractions | Fractions of the pie sections for the vertices if | list of ``int`` or     | ``[0.75, 0.25]``                 |
        |               | ``shape=="pie"``.                                 | ``float``              |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
        | pie_colors    | Colors used in the pie sections if                | list of strings or     | ``('b','g','r','c','m','y','k')``|
        |               | ``shape=="pie"``.                                 | ``float``.             |                                  |
        +---------------+---------------------------------------------------+------------------------+----------------------------------+
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723


    .. table:: **List of edge properties**

        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | Name           | Description                                       | Accepted types         | Default Value                    |
        +================+===================================================+========================+==================================+
        | color          | Color used to stroke the edge lines.              | ``str`` or list of     | ``[0.179, 0.203,0.210, 0.8]``    |
        |                |                                                   | floats                 |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | pen_width      | Width of the line used to draw the edge, in       | ``float`` or ``int``   | ``1.0``                          |
        |                | the default units of the output format (normally  |                        |                                  |
        |                | either pixels or points).                         |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | start_marker,  | Edge markers. Can be one of "none", "arrow",      | ``str`` or ``int``     | ``-1``                           |
        | mid_marker,    | "circle", "square", "diamond", or "bar".          |                        |                                  |
        | end_marker     | Optionally, this might take a numeric value       |                        |                                  |
        |                | corresponding to position in the list above.      |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
724
725
        | mid_marker_pos | Relative position of the middle marker.           | ``float``              | ``0.5``                          |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
726
727
728
729
        | marker_size    | Size of edge markers, in units appropriate to the | ``float`` or ``int``   | ``4``                            |
        |                | output format (normally either pixels or points). |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | control_points | Control points of a Bézier spline used to draw    | sequence of ``floats`` | ``[]``                           |
Tiago Peixoto's avatar
Tiago Peixoto committed
730
731
732
733
734
735
736
737
738
        |                | the edge. Each spline segment requires 6 values   |                        |                                  |
        |                | corresponding to the (x,y) coordinates of the two |                        |                                  |
        |                | intermediary control points and the final point.  |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | gradient       | Stop points of a linear gradient used to stroke   | sequence of ``floats`` | ``[]``                           |
        |                | the edge. Each group of 5 elements is interpreted |                        |                                  |
        |                | as ``[o, r, g, b, a]`` where ``o`` is the offset  |                        |                                  |
        |                | in the range [0, 1] and the remaining values      |                        |                                  |
        |                | specify the colors.                               |                        |                                  |
739
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
740
741
742
743
744
745
        | dash_style     | Dash pattern is specified by an array of positive | sequence of ``floats`` | ``[]``                           |
        |                | values. Each value provides the length of         |                        |                                  |
        |                | alternate "on" and "off" portions of the stroke.  |                        |                                  |
        |                | The last value specifies an offset into the       |                        |                                  |
        |                | pattern at which the stroke begins.               |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
        | text           | Text to draw next to the edges.                   | ``str``                | ``""``                           |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | text_color     | Color used to draw the text.                      | ``str`` or list of     | ``[0., 0., 0., 1.]``             |
        |                |                                                   | ``floats``             |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | text_distance  | Distance from the edge and its text.              | ``float`` or ``int``   | ``4``                            |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | text_parallel  | If ``True`` the text will be drawn parallel to    | ``bool``               | ``True``                         |
        |                | the edges.                                        |                        |                                  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_family    | Font family used to draw the text.                | ``str``                | ``"serif"``                      |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_slant     | Font slant used to draw the text.                 | ``cairo.FONT_SLANT_*`` | :data:`cairo.FONT_SLANT_NORMAL`  |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_weight    | Font weight used to draw the text.                | ``cairo.FONT_WEIGHT_*``| :data:`cairo.FONT_WEIGHT_NORMAL` |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
        | font_size      | Font size used to draw the text.                  | ``float`` or ``int``   | ``12``                           |
        +----------------+---------------------------------------------------+------------------------+----------------------------------+
764
765
766

    Examples
    --------
767
768
769
770
771
772
773
    .. testcode::
       :hide:

       np.random.seed(42)
       gt.seed_rng(42)
       from numpy import sqrt

774
775
776
    >>> g = gt.price_network(1500)
    >>> deg = g.degree_property_map("in")
    >>> deg.a = 4 * (sqrt(deg.a) * 0.5 + 0.4)
777
778
    >>> ebet = gt.betweenness(g)[1]
    >>> ebet.a /= ebet.a.max() / 10.
779
780
781
782
783
784
785
786
787
788
    >>> eorder = ebet.copy()
    >>> eorder.a *= -1
    >>> pos = gt.sfdp_layout(g)
    >>> control = g.new_edge_property("vector<double>")
    >>> for e in g.edges():
    ...     d = sqrt(sum((pos[e.source()].a - pos[e.target()].a) ** 2)) / 5
    ...     control[e] = [0.3, d, 0.7, d]
    >>> gt.graph_draw(g, pos=pos, vertex_size=deg, vertex_fill_color=deg, vorder=deg,
    ...               edge_color=ebet, eorder=eorder, edge_pen_width=ebet,
    ...               edge_control_points=control, # some curvy edges
789
790
791
    ...               output="graph-draw.pdf")
    <...>

792
793
794
795
796
797
798
799
800
    .. testcode::
       :hide:

       gt.graph_draw(g, pos=pos, vertex_size=deg, vertex_fill_color=deg, vorder=deg,
                     edge_color=ebet, eorder=eorder, edge_pen_width=ebet,
                     edge_control_points=control,
                     output="graph-draw.png")


801
802
803
    .. figure:: graph-draw.*
        :align: center

804
805
806
        SFDP force-directed layout of a Price network with 1500 nodes. The
        vertex size and color indicate the degree, and the edge color and width
        the edge betweeness centrality.
807
808
809

    """

Tiago Peixoto's avatar
Tiago Peixoto committed
810
811
812
813
814
815
816
817
818
    vprops = vprops.copy() if vprops is not None else {}
    eprops = eprops.copy() if eprops is not None else {}

    props, kwargs = parse_props("vertex", kwargs)
    vprops.update(props)
    props, kwargs = parse_props("edge", kwargs)
    eprops.update(props)

    if pos is None:
819
        if (g.num_vertices() > 2 and output is None and
820
            not inline and kwargs.get("update_layout", True)):
Tiago Peixoto's avatar
Tiago Peixoto committed
821
822
823
824
825
826
827
828
829
            L = np.sqrt(g.num_vertices())
            pos = random_layout(g, [L, L])
            if g.num_vertices() > 1000:
                if "multilevel" not in kwargs:
                    kwargs["multilevel"] = True
            if "layout_K" not in kwargs:
                kwargs["layout_K"] = _avg_edge_distance(g, pos) / 10
        else:
            pos = sfdp_layout(g)
830
831
    else:
        _check_prop_vector(pos, name="pos", floating=True)
832
        if output is None and not inline:
833
834
835
836
            if "layout_K" not in kwargs:
                kwargs["layout_K"] = _avg_edge_distance(g, pos)
            if "update_layout" not in kwargs:
                kwargs["update_layout"] = False
Tiago Peixoto's avatar
Tiago Peixoto committed
837

838
839
840
841
842
843
844
845
    if "pen_width" in eprops and "marker_size" not in eprops:
        pw = eprops["pen_width"]
        if isinstance(pw, PropertyMap):
            pw = pw.copy()
            pw.a = pw.a * 2.75
            eprops["marker_size"] = pw
        else:
            eprops["marker_size"] = pw * 2.75
846

847
848
849
850
851
852
853
854
855
    if "text" in eprops and "text_distance" not in eprops and "pen_width" in eprops:
        pw = eprops["pen_width"]
        if isinstance(pw, PropertyMap):
            pw = pw.copy()
            pw.a *= 2
            eprops["text_distance"] = pw
        else:
            eprops["text_distance"] = pw * 2

856
    if "text" in vprops and ("text_color" not in vprops or vprops["text_color"] == "auto"):
857
858
        vcmap = kwargs.get("vcmap", matplotlib.cm.jet)
        bg = _convert(vertex_attrs.fill_color, vprops.get("fill_color", _vdefaults["fill_color"]), vcmap)
859
860
861
862
863
864
865
866
867
        if "bg_color" in kwargs:
            bg_color = kwargs["bg_color"]
        else:
            bg_color = [1., 1., 1., 1.]
        vprops["text_color"] = auto_colors(g, bg,
                                           vprops.get("text_position",
                                                      _vdefaults["text_position"]),
                                           bg_color)

868
869
870
871
872
    if mplfig:
        mplfig.artists.append(GraphToolArtist(g, pos, vprops, eprops, vorder, eorder,
                nodesfirst, **kwargs))
        return

873
874
    if inline:
        if fmt == "auto":
875
876
877
878
879
            if output is None:
                fmt = "png"
            else:
                fmt = get_file_fmt(output)
        output_file = output
880
881
        output = io.BytesIO()

882
    if output is None:
883
884
885
886
887
888
889
890
        for p, val in vprops.items():
            if isinstance(val, PropertyMap):
                vprops[p] = _convert(vertex_attrs.__dict__[p], val,
                                     kwargs.get("vcmap", default_cm))
        for p, val in eprops.items():
            if isinstance(val, PropertyMap):
                eprops[p] = _convert(edge_attrs.__dict__[p], val,
                                     kwargs.get("ecmap", default_cm))
Tiago Peixoto's avatar
Tiago Peixoto committed
891
892
893
        return interactive_window(g, pos, vprops, eprops, vorder, eorder,
                                  nodesfirst, **kwargs)
    else:
894
895
896
897
898
899
        if isinstance(output, str):
            out, auto_fmt = open_file(output, mode="wb")
        else:
            out = output
            if fmt == "auto":
                raise ValueError("File format must be specified.")
Tiago Peixoto's avatar
Tiago Peixoto committed
900
901

        if fmt == "auto":
902
            fmt = auto_fmt
Tiago Peixoto's avatar
Tiago Peixoto committed
903
904
905
906
        if fmt == "pdf":
            srf = cairo.PDFSurface(out, output_size[0], output_size[1])
        elif fmt == "ps":
            srf = cairo.PSSurface(out, output_size[0], output_size[1])
Tiago Peixoto's avatar
Tiago Peixoto committed
907
908
909
        elif fmt == "eps":
            srf = cairo.PSSurface(out, output_size[0], output_size[1])
            srf.set_eps(True)
Tiago Peixoto's avatar
Tiago Peixoto committed
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
        elif fmt == "svg":
            srf = cairo.SVGSurface(out, output_size[0], output_size[1])
        elif fmt == "png":
            srf = cairo.ImageSurface(cairo.FORMAT_ARGB32, output_size[0],
                                     output_size[1])
        else:
            raise ValueError("Invalid format type: " + fmt)

        cr = cairo.Context(srf)

        adjust_default_sizes(g, output_size, vprops, eprops)
        if fit_view:
            offset, zoom = fit_to_view(g, pos, output_size, vprops["size"],
                                       vprops["pen_width"], None,
                                       vprops.get("text", None),
                                       vprops.get("font_family",
                                                  _vdefaults["font_family"]),
                                       vprops.get("font_size",
                                                  _vdefaults["font_size"]),
                                       cr)
        else:
            offset, zoom = [0, 0], 1

        if "bg_color" in kwargs:
            bg_color = kwargs["bg_color"]
            del  kwargs["bg_color"]
            cr.set_source_rgba(bg_color[0], bg_color[1],
                               bg_color[2], bg_color[3])
            cr.paint()
939

Tiago Peixoto's avatar
Tiago Peixoto committed
940
941
942
943
944
        cr.translate(offset[0], offset[1])
        cr.scale(zoom, zoom)

        cairo_draw(g, pos, cr, vprops, eprops, vorder, eorder,
                   nodesfirst, **kwargs)
945

946
        if fmt == "png":
Tiago Peixoto's avatar
Tiago Peixoto committed
947
            srf.write_to_png(out)
948
949
950
951
952
953
954
955
956
957

        del cr

        if inline:
            img = None
            if fmt == "png":
                img = IPython.display.Image(data=out.getvalue())
            if fmt == "svg":
                img = IPython.display.SVG(data=out.getvalue())
            if img is None:
958
959
                inl_out = io.BytesIO()
                inl_srf = cairo.ImageSurface(cairo.FORMAT_ARGB32,
Pietro Battiston's avatar
Pietro Battiston committed
960
961
                                             output_size[0],
                                             output_size[1])
962
963
964
965
966
967
                inl_cr = cairo.Context(inl_srf)
                inl_cr.set_source_surface(srf, 0, 0)
                inl_cr.paint()
                inl_srf.write_to_png(inl_out)
                del inl_srf
                img = IPython.display.Image(data=inl_out.getvalue())
968
            srf.finish()
969
970
971
972
973
974
975
976
            if output_file is not None:
                if isinstance(output_file, str):
                    ofile, auto_fmt = open_file(output_file, mode="wb")
                else:
                    ofile = output_file
                ofile.write(out.getvalue())
                if isinstance(output_file, str):
                    ofile.close()
977
            IPython.display.display(img)
978
        del srf
Tiago Peixoto's avatar
Tiago Peixoto committed
979
        return pos
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000


def adjust_default_sizes(g, geometry, vprops, eprops, force=False):
    if "size" not in vprops or force:
        A = geometry[0] * geometry[1]
        vprops["size"] = np.sqrt(A / g.num_vertices()) / 3.5

    if "pen_width" not in vprops or force:
        size = vprops["size"]
        if isinstance(vprops["size"], PropertyMap):
            size = vprops["size"].fa.mean()
        vprops["pen_width"] = size / 10
        if "pen_width" not in eprops or force:
            eprops["pen_width"] = size / 10
        if "marker_size" not in eprops or force:
            eprops["marker_size"] = size * 0.8


def scale_ink(scale, vprops, eprops):
    if "size" not in vprops:
        vprops["size"] = _vdefaults["size"]