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plotutil.go
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// Copyright ©2015 The gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package plotutil contains a small number of utilites for creating
plots.
This package is under active development so portions of it may change.
*/
package
plotutil
import
(
"image/color"
"github.com/gonum/plot/vg"
"github.com/gonum/plot/vg/draw"
)
// DefaultColors is a set of colors used by the Color function.
var
DefaultColors
=
SoftColors
var
DarkColors
=
[]color.
Color
{
rgb
(
238
,
46
,
47
),
rgb
(
0
,
140
,
72
),
rgb
(
24
,
90
,
169
),
rgb
(
244
,
125
,
35
),
rgb
(
102
,
44
,
145
),
rgb
(
162
,
29
,
33
),
rgb
(
180
,
56
,
148
),
}
var
SoftColors
=
[]color.
Color
{
rgb
(
241
,
90
,
96
),
rgb
(
122
,
195
,
106
),
rgb
(
90
,
155
,
212
),
rgb
(
250
,
167
,
91
),
rgb
(
158
,
103
,
171
),
rgb
(
206
,
112
,
88
),
rgb
(
215
,
127
,
180
),
}
func
rgb
(
r
,
g
,
b
uint8
) color.
RGBA
{
return
color.
RGBA
{
r
,
g
,
b
,
255
}
}
// Color returns the ith default color, wrapping
// if i is less than zero or greater than the max
// number of colors in the DefaultColors slice.
func
Color
(
i
int
) color.
Color
{
n
:=
len
(
DefaultColors
)
if
i
<
0
{
return
DefaultColors
[
i
%
n
+
n
]
}
return
DefaultColors
[
i
%
n
]
}
// DefaultGlyphShapes is a set of GlyphDrawers used by
// the Shape function.
var
DefaultGlyphShapes
=
[]draw.
GlyphDrawer
{
draw.
RingGlyph
{},
draw.
SquareGlyph
{},
draw.
TriangleGlyph
{},
draw.
CrossGlyph
{},
draw.
PlusGlyph
{},
draw.
CircleGlyph
{},
draw.
BoxGlyph
{},
draw.
PyramidGlyph
{},
}
// Shape returns the ith default glyph shape,
// wrapping if i is less than zero or greater
// than the max number of GlyphDrawers
// in the DefaultGlyphShapes slice.
func
Shape
(
i
int
) draw.
GlyphDrawer
{
n
:=
len
(
DefaultGlyphShapes
)
if
i
<
0
{
return
DefaultGlyphShapes
[
i
%
n
+
n
]
}
return
DefaultGlyphShapes
[
i
%
n
]
}
// DefaultDashes is a set of dash patterns used by
// the Dashes function.
var
DefaultDashes
=
[][]vg.
Length
{
{},
{
vg
.
Points
(
6
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
2
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
1
),
vg
.
Points
(
1
)},
{
vg
.
Points
(
5
),
vg
.
Points
(
2
),
vg
.
Points
(
1
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
10
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
10
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
5
),
vg
.
Points
(
2
),
vg
.
Points
(
5
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
),
vg
.
Points
(
2
)},
{
vg
.
Points
(
4
),
vg
.
Points
(
2
),
vg
.
Points
(
4
),
vg
.
Points
(
1
),
vg
.
Points
(
1
),
vg
.
Points
(
1
),
vg
.
Points
(
1
),
vg
.
Points
(
1
),
vg
.
Points
(
1
),
vg
.
Points
(
1
)},
}
// Dashes returns the ith default dash pattern,
// wrapping if i is less than zero or greater
// than the max number of dash patters
// in the DefaultDashes slice.
func
Dashes
(
i
int
) []vg.
Length
{
n
:=
len
(
DefaultDashes
)
if
i
<
0
{
return
DefaultDashes
[
i
%
n
+
n
]
}
return
DefaultDashes
[
i
%
n
]
}
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