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"""Shared utilities for the visualization subpackage."""
import
re
def
_require_matplotlib
():
"""Lazy import matplotlib with clear error message.
Returns
-------
module
The ``matplotlib.pyplot`` module.
"""
try
:
import
matplotlib
.
pyplot
as
plt
return
plt
except
ImportError
:
raise
ImportError
(
"matplotlib is required for plotting. "
"Install it with: pip install matplotlib"
)
def
_require_plotly
():
"""Lazy import plotly with clear error message.
Returns
-------
module
The ``plotly.graph_objects`` module.
"""
try
:
import
plotly
.
graph_objects
as
go
return
go
except
ImportError
:
raise
ImportError
(
"plotly is required for interactive plots. "
"Install with: pip install diff-diff[plotly]"
)
def
_plotly_default_layout
(
fig
,
*
,
title
=
None
,
xlabel
=
None
,
ylabel
=
None
,
show_legend
=
True
):
"""Apply standard plotly layout settings.
Parameters
----------
fig : plotly.graph_objects.Figure
The figure to configure.
title : str, optional
Plot title.
xlabel : str, optional
X-axis label.
ylabel : str, optional
Y-axis label.
show_legend : bool, default=True
Whether to show the legend.
"""
fig
.
update_layout
(
title
=
title
,
xaxis_title
=
xlabel
,
yaxis_title
=
ylabel
,
showlegend
=
show_legend
,
template
=
"plotly_white"
,
font
=
dict
(
size
=
12
),
margin
=
dict
(
l
=
60
,
r
=
30
,
t
=
50
,
b
=
50
),
)
# Complete CSS named color table (all 148 standard CSS colors).
# No matplotlib dependency required for any color used by plotly/CSS.
_CSS_COLORS
=
{
"aliceblue"
: (
240
,
248
,
255
),
"antiquewhite"
: (
250
,
235
,
215
),
"aqua"
: (
0
,
255
,
255
),
"aquamarine"
: (
127
,
255
,
212
),
"azure"
: (
240
,
255
,
255
),
"beige"
: (
245
,
245
,
220
),
"bisque"
: (
255
,
228
,
196
),
"black"
: (
0
,
0
,
0
),
"blanchedalmond"
: (
255
,
235
,
205
),
"blue"
: (
0
,
0
,
255
),
"blueviolet"
: (
138
,
43
,
226
),
"brown"
: (
165
,
42
,
42
),
"burlywood"
: (
222
,
184
,
135
),
"cadetblue"
: (
95
,
158
,
160
),
"chartreuse"
: (
127
,
255
,
0
),
"chocolate"
: (
210
,
105
,
30
),
"coral"
: (
255
,
127
,
80
),
"cornflowerblue"
: (
100
,
149
,
237
),
"cornsilk"
: (
255
,
248
,
220
),
"crimson"
: (
220
,
20
,
60
),
"cyan"
: (
0
,
255
,
255
),
"darkblue"
: (
0
,
0
,
139
),
"darkcyan"
: (
0
,
139
,
139
),
"darkgoldenrod"
: (
184
,
134
,
11
),
"darkgray"
: (
169
,
169
,
169
),
"darkgreen"
: (
0
,
100
,
0
),
"darkgrey"
: (
169
,
169
,
169
),
"darkkhaki"
: (
189
,
183
,
107
),
"darkmagenta"
: (
139
,
0
,
139
),
"darkolivegreen"
: (
85
,
107
,
47
),
"darkorange"
: (
255
,
140
,
0
),
"darkorchid"
: (
153
,
50
,
204
),
"darkred"
: (
139
,
0
,
0
),
"darksalmon"
: (
233
,
150
,
122
),
"darkseagreen"
: (
143
,
188
,
143
),
"darkslateblue"
: (
72
,
61
,
139
),
"darkslategray"
: (
47
,
79
,
79
),
"darkslategrey"
: (
47
,
79
,
79
),
"darkturquoise"
: (
0
,
206
,
209
),
"darkviolet"
: (
148
,
0
,
211
),
"deeppink"
: (
255
,
20
,
147
),
"deepskyblue"
: (
0
,
191
,
255
),
"dimgray"
: (
105
,
105
,
105
),
"dimgrey"
: (
105
,
105
,
105
),
"dodgerblue"
: (
30
,
144
,
255
),
"firebrick"
: (
178
,
34
,
34
),
"floralwhite"
: (
255
,
250
,
240
),
"forestgreen"
: (
34
,
139
,
34
),
"fuchsia"
: (
255
,
0
,
255
),
"gainsboro"
: (
220
,
220
,
220
),
"ghostwhite"
: (
248
,
248
,
255
),
"gold"
: (
255
,
215
,
0
),
"goldenrod"
: (
218
,
165
,
32
),
"gray"
: (
128
,
128
,
128
),
"green"
: (
0
,
128
,
0
),
"greenyellow"
: (
173
,
255
,
47
),
"grey"
: (
128
,
128
,
128
),
"honeydew"
: (
240
,
255
,
240
),
"hotpink"
: (
255
,
105
,
180
),
"indianred"
: (
205
,
92
,
92
),
"indigo"
: (
75
,
0
,
130
),
"ivory"
: (
255
,
255
,
240
),
"khaki"
: (
240
,
230
,
140
),
"lavender"
: (
230
,
230
,
250
),
"lavenderblush"
: (
255
,
240
,
245
),
"lawngreen"
: (
124
,
252
,
0
),
"lemonchiffon"
: (
255
,
250
,
205
),
"lightblue"
: (
173
,
216
,
230
),
"lightcoral"
: (
240
,
128
,
128
),
"lightcyan"
: (
224
,
255
,
255
),
"lightgoldenrodyellow"
: (
250
,
250
,
210
),
"lightgray"
: (
211
,
211
,
211
),
"lightgreen"
: (
144
,
238
,
144
),
"lightgrey"
: (
211
,
211
,
211
),
"lightpink"
: (
255
,
182
,
193
),
"lightsalmon"
: (
255
,
160
,
122
),
"lightseagreen"
: (
32
,
178
,
170
),
"lightskyblue"
: (
135
,
206
,
250
),
"lightslategray"
: (
119
,
136
,
153
),
"lightslategrey"
: (
119
,
136
,
153
),
"lightsteelblue"
: (
176
,
196
,
222
),
"lightyellow"
: (
255
,
255
,
224
),
"lime"
: (
0
,
255
,
0
),
"limegreen"
: (
50
,
205
,
50
),
"linen"
: (
250
,
240
,
230
),
"magenta"
: (
255
,
0
,
255
),
"maroon"
: (
128
,
0
,
0
),
"mediumaquamarine"
: (
102
,
205
,
170
),
"mediumblue"
: (
0
,
0
,
205
),
"mediumorchid"
: (
186
,
85
,
211
),
"mediumpurple"
: (
147
,
112
,
219
),
"mediumseagreen"
: (
60
,
179
,
113
),
"mediumslateblue"
: (
123
,
104
,
238
),
"mediumspringgreen"
: (
0
,
250
,
154
),
"mediumturquoise"
: (
72
,
209
,
204
),
"mediumvioletred"
: (
199
,
21
,
133
),
"midnightblue"
: (
25
,
25
,
112
),
"mintcream"
: (
245
,
255
,
250
),
"mistyrose"
: (
255
,
228
,
225
),
"moccasin"
: (
255
,
228
,
181
),
"navajowhite"
: (
255
,
222
,
173
),
"navy"
: (
0
,
0
,
128
),
"oldlace"
: (
253
,
245
,
230
),
"olive"
: (
128
,
128
,
0
),
"olivedrab"
: (
107
,
142
,
35
),
"orange"
: (
255
,
165
,
0
),
"orangered"
: (
255
,
69
,
0
),
"orchid"
: (
218
,
112
,
214
),
"palegoldenrod"
: (
238
,
232
,
170
),
"palegreen"
: (
152
,
251
,
152
),
"paleturquoise"
: (
175
,
238
,
238
),
"palevioletred"
: (
219
,
112
,
147
),
"papayawhip"
: (
255
,
239
,
213
),
"peachpuff"
: (
255
,
218
,
185
),
"peru"
: (
205
,
133
,
63
),
"pink"
: (
255
,
192
,
203
),
"plum"
: (
221
,
160
,
221
),
"powderblue"
: (
176
,
224
,
230
),
"purple"
: (
128
,
0
,
128
),
"rebeccapurple"
: (
102
,
51
,
153
),
"red"
: (
255
,
0
,
0
),
"rosybrown"
: (
188
,
143
,
143
),
"royalblue"
: (
65
,
105
,
225
),
"saddlebrown"
: (
139
,
69
,
19
),
"salmon"
: (
250
,
128
,
114
),
"sandybrown"
: (
244
,
164
,
96
),
"seagreen"
: (
46
,
139
,
87
),
"seashell"
: (
255
,
245
,
238
),
"sienna"
: (
160
,
82
,
45
),
"silver"
: (
192
,
192
,
192
),
"skyblue"
: (
135
,
206
,
235
),
"slateblue"
: (
106
,
90
,
205
),
"slategray"
: (
112
,
128
,
144
),
"slategrey"
: (
112
,
128
,
144
),
"snow"
: (
255
,
250
,
250
),
"springgreen"
: (
0
,
255
,
127
),
"steelblue"
: (
70
,
130
,
180
),
"tan"
: (
210
,
180
,
140
),
"teal"
: (
0
,
128
,
128
),
"thistle"
: (
216
,
191
,
216
),
"tomato"
: (
255
,
99
,
71
),
"turquoise"
: (
64
,
224
,
208
),
"violet"
: (
238
,
130
,
238
),
"wheat"
: (
245
,
222
,
179
),
"white"
: (
255
,
255
,
255
),
"whitesmoke"
: (
245
,
245
,
245
),
"yellow"
: (
255
,
255
,
0
),
"yellowgreen"
: (
154
,
205
,
50
),
}
_RGB_RE
=
re
.
compile
(
r"^rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$"
)
_RGBA_RE
=
re
.
compile
(
r"^rgba\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,\s*([0-9.]+)\s*\)$"
)
def
_color_to_rgba
(
color
,
alpha
=
1.0
):
"""Convert any color to an ``rgba(r, g, b, a)`` string for plotly.
Accepts hex colors (``#rrggbb``, ``#rgb``), all 148 CSS named colors,
and ``rgb(r,g,b)`` / ``rgba(r,g,b,a)`` strings. Does **not** require
matplotlib.
Parameters
----------
color : str
Color specification.
alpha : float, default=1.0
Opacity value between 0 and 1.
Returns
-------
str
An ``rgba(r, g, b, a)`` string.
"""
if
not
isinstance
(
color
,
str
):
raise
ValueError
(
f"Expected a color string, got
{
type
(
color
).
__name__
}
"
)
# 1. Hex colors: #rrggbb or #rgb
stripped
=
color
.
lstrip
(
"#"
)
if
color
.
startswith
(
"#"
)
and
all
(
c
in
"0123456789abcdefABCDEF"
for
c
in
stripped
):
if
len
(
stripped
)
==
6
:
r
=
int
(
stripped
[
0
:
2
],
16
)
g
=
int
(
stripped
[
2
:
4
],
16
)
b
=
int
(
stripped
[
4
:
6
],
16
)
return
f"rgba(
{
r
}
,
{
g
}
,
{
b
}
,
{
alpha
}
)"
if
len
(
stripped
)
==
3
:
r
=
int
(
stripped
[
0
]
*
2
,
16
)
g
=
int
(
stripped
[
1
]
*
2
,
16
)
b
=
int
(
stripped
[
2
]
*
2
,
16
)
return
f"rgba(
{
r
}
,
{
g
}
,
{
b
}
,
{
alpha
}
)"
# 2. Named CSS colors (complete table — no matplotlib needed)
if
color
.
lower
()
in
_CSS_COLORS
:
r
,
g
,
b
=
_CSS_COLORS
[
color
.
lower
()]
return
f"rgba(
{
r
}
,
{
g
}
,
{
b
}
,
{
alpha
}
)"
# 3. rgb(r, g, b) — parse and apply alpha
m
=
_RGB_RE
.
match
(
color
.
strip
())
if
m
:
r
,
g
,
b
=
int
(
m
.
group
(
1
)),
int
(
m
.
group
(
2
)),
int
(
m
.
group
(
3
))
return
f"rgba(
{
r
}
,
{
g
}
,
{
b
}
,
{
alpha
}
)"
# 4. rgba(r, g, b, a) — parse and override alpha
m
=
_RGBA_RE
.
match
(
color
.
strip
())
if
m
:
r
,
g
,
b
=
int
(
m
.
group
(
1
)),
int
(
m
.
group
(
2
)),
int
(
m
.
group
(
3
))
return
f"rgba(
{
r
}
,
{
g
}
,
{
b
}
,
{
alpha
}
)"
raise
ValueError
(
f"Cannot parse color '
{
color
}
'. Use hex (#rrggbb), a CSS color name, "
"or rgb(r,g,b) / rgba(r,g,b,a) format."
)
# Matplotlib marker code -> plotly symbol name mapping
_MPL_TO_PLOTLY_SYMBOL
=
{
"o"
:
"circle"
,
"s"
:
"square"
,
"D"
:
"diamond"
,
"d"
:
"diamond"
,
"^"
:
"triangle-up"
,
"v"
:
"triangle-down"
,
"<"
:
"triangle-left"
,
">"
:
"triangle-right"
,
"p"
:
"pentagon"
,
"h"
:
"hexagon"
,
"+"
:
"cross"
,
"x"
:
"x"
,
"*"
:
"star"
,
"."
:
"circle"
,
}
def
_mpl_marker_to_plotly_symbol
(
marker
):
"""Convert a matplotlib marker code to a plotly symbol name.
Parameters
----------
marker : str
Matplotlib marker shorthand (e.g., ``"o"``, ``"s"``, ``"D"``).
Returns
-------
str
Plotly symbol name (e.g., ``"circle"``, ``"square"``, ``"diamond"``).
Returns ``"circle"`` for unrecognized markers.
"""
return
_MPL_TO_PLOTLY_SYMBOL
.
get
(
marker
,
"circle"
)
# Default color constants
DEFAULT_BLUE
=
"#2563eb"
DEFAULT_RED
=
"#dc2626"
DEFAULT_GREEN
=
"#22c55e"
DEFAULT_GRAY
=
"#6b7280"
DEFAULT_DARK
=
"#1f2937"
DEFAULT_SHADE
=
"#f0f0f0"
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