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plot/plotter/example_scatterColor_test.go at master · zyhong/plot · GitHub
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example_scatterColor_test.go
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/
example_scatterColor_test.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
plotter_test
import
(
"fmt"
"log"
"math"
"os"
"golang.org/x/exp/rand"
"gonum.org/v1/plot"
"gonum.org/v1/plot/palette/moreland"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
"gonum.org/v1/plot/vg/vgimg"
)
// ExampleScatter_color draws a colored scatter plot.
// Each point is plotted with a different color depending on
// external criteria.
func
ExampleScatter_color
() {
rnd
:=
rand
.
New
(
rand
.
NewSource
(
1
))
// randomTriples returns some random but correlated x, y, z triples
randomTriples
:=
func
(
n
int
) plotter.
XYZs
{
data
:=
make
(plotter.
XYZs
,
n
)
for
i
:=
range
data
{
if
i
==
0
{
data
[
i
].
X
=
rnd
.
Float64
()
}
else
{
data
[
i
].
X
=
data
[
i
-
1
].
X
+
2
*
rnd
.
Float64
()
}
data
[
i
].
Y
=
data
[
i
].
X
+
10
*
rnd
.
Float64
()
data
[
i
].
Z
=
data
[
i
].
X
}
return
data
}
n
:=
15
scatterData
:=
randomTriples
(
n
)
// Calculate the range of Z values.
minZ
,
maxZ
:=
math
.
Inf
(
1
),
math
.
Inf
(
-
1
)
for
_
,
xyz
:=
range
scatterData
{
if
xyz
.
Z
>
maxZ
{
maxZ
=
xyz
.
Z
}
if
xyz
.
Z
<
minZ
{
minZ
=
xyz
.
Z
}
}
colors
:=
moreland
.
Kindlmann
()
// Initialize a color map.
colors
.
SetMax
(
maxZ
)
colors
.
SetMin
(
minZ
)
p
,
err
:=
plot
.
New
()
if
err
!=
nil
{
log
.
Panic
(
err
)
}
p
.
Title
.
Text
=
"Colored Points Example"
p
.
X
.
Label
.
Text
=
"X"
p
.
Y
.
Label
.
Text
=
"Y"
p
.
Add
(
plotter
.
NewGrid
())
sc
,
err
:=
plotter
.
NewScatter
(
scatterData
)
if
err
!=
nil
{
log
.
Panic
(
err
)
}
// Specify style and color for individual points.
sc
.
GlyphStyleFunc
=
func
(
i
int
) draw.
GlyphStyle
{
_
,
_
,
z
:=
scatterData
.
XYZ
(
i
)
d
:=
(
z
-
minZ
)
/
(
maxZ
-
minZ
)
rng
:=
maxZ
-
minZ
k
:=
d
*
rng
+
minZ
c
,
err
:=
colors
.
At
(
k
)
if
err
!=
nil
{
log
.
Panic
(
err
)
}
return
draw.
GlyphStyle
{
Color
:
c
,
Radius
:
vg
.
Points
(
3
),
Shape
: draw.
CircleGlyph
{}}
}
p
.
Add
(
sc
)
//Create a legend
thumbs
:=
plotter
.
PaletteThumbnailers
(
colors
.
Palette
(
n
))
for
i
:=
len
(
thumbs
)
-
1
;
i
>=
0
;
i
--
{
t
:=
thumbs
[
i
]
if
i
!=
0
&&
i
!=
len
(
thumbs
)
-
1
{
p
.
Legend
.
Add
(
""
,
t
)
continue
}
var
val
int
switch
i
{
case
0
:
val
=
int
(
minZ
)
case
len
(
thumbs
)
-
1
:
val
=
int
(
maxZ
)
}
p
.
Legend
.
Add
(
fmt
.
Sprintf
(
"%d"
,
val
),
t
)
}
// This is the width of the legend, experimentally determined.
const
legendWidth
=
vg
.
Centimeter
// Slide the legend over so it doesn't overlap the ScatterPlot.
p
.
Legend
.
XOffs
=
legendWidth
img
:=
vgimg
.
New
(
300
,
230
)
dc
:=
draw
.
New
(
img
)
dc
=
draw
.
Crop
(
dc
,
0
,
-
legendWidth
,
0
,
0
)
// Make space for the legend.
p
.
Draw
(
dc
)
w
,
err
:=
os
.
Create
(
"testdata/scatterColor.png"
)
if
err
!=
nil
{
log
.
Panic
(
err
)
}
defer
w
.
Close
()
png
:=
vgimg.
PngCanvas
{
Canvas
:
img
}
if
_
,
err
=
png
.
WriteTo
(
w
);
err
!=
nil
{
log
.
Panic
(
err
)
}
if
err
=
w
.
Close
();
err
!=
nil
{
log
.
Panic
(
err
)
}
}
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