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plot/plot_test.go at master · edwindvinas/plot · GitHub
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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
plot_test
import
(
"bytes"
"fmt"
"image/color"
"math"
"os"
"testing"
"time"
"gonum.org/v1/plot"
"gonum.org/v1/plot/cmpimg"
"gonum.org/v1/plot/font"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/text"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
"gonum.org/v1/plot/vg/recorder"
"gonum.org/v1/plot/vg/vgimg"
)
func
TestLegendAlignment
(
t
*
testing.
T
) {
l
:=
plot.
Legend
{
ThumbnailWidth
:
vg
.
Points
(
20
),
TextStyle
: text.
Style
{
Font
:
font
.
From
(
plot
.
DefaultFont
,
10
),
Handler
:
plot
.
DefaultTextHandler
,
},
}
for
i
,
n
:=
range
[]
string
{
"A"
,
"B"
,
"C"
,
"D"
} {
b
,
err
:=
plotter
.
NewBarChart
(plotter.
Values
{
0
},
1
)
if
err
!=
nil
{
t
.
Fatalf
(
"failed to create bar chart %q: %v"
,
n
,
err
)
}
b
.
Color
=
color.
Gray
{
byte
(
i
+
1
)
*
64
-
1
}
l
.
Add
(
n
,
b
)
}
c
:=
vgimg.
PngCanvas
{
Canvas
:
vgimg
.
New
(
5
*
vg
.
Centimeter
,
5
*
vg
.
Centimeter
)}
l
.
Draw
(
draw
.
New
(
c
))
var
buf
bytes.
Buffer
if
_
,
err
:=
c
.
WriteTo
(
&
buf
);
err
!=
nil
{
t
.
Fatal
(
err
)
}
if
*
cmpimg
.
GenerateTestData
{
// Recreate Golden images and exit.
err
:=
os
.
WriteFile
(
"testdata/legendAlignment_golden.png"
,
buf
.
Bytes
(),
0o644
)
if
err
!=
nil
{
t
.
Fatal
(
err
)
}
return
}
err
:=
os
.
WriteFile
(
"testdata/legendAlignment.png"
,
buf
.
Bytes
(),
0o644
)
if
err
!=
nil
{
t
.
Fatal
(
err
)
}
want
,
err
:=
os
.
ReadFile
(
"testdata/legendAlignment_golden.png"
)
if
err
!=
nil
{
t
.
Fatal
(
err
)
}
ok
,
err
:=
cmpimg
.
Equal
(
"png"
,
buf
.
Bytes
(),
want
)
if
err
!=
nil
{
t
.
Fatal
(
err
)
}
if
!
ok
{
t
.
Fatalf
(
"images differ"
)
}
}
func
TestIssue514
(
t
*
testing.
T
) {
for
_
,
ulp
:=
range
[]
int
{
0
,
+
1
,
+
2
,
+
3
,
+
4
,
+
5
,
+
6
,
+
7
,
+
8
,
+
9
,
+
10
,
+
11
,
+
12
,
+
13
,
+
14
,
+
15
,
+
16
,
+
17
,
+
18
,
+
19
,
+
20
,
+
21
,
+
22
,
-
1
,
-
2
,
-
3
,
-
4
,
-
5
,
-
6
,
-
7
,
-
8
,
-
9
,
-
10
,
-
11
,
-
12
,
-
13
,
-
14
,
-
15
,
-
16
,
-
17
,
-
18
,
-
19
,
-
20
,
-
21
,
-
22
,
} {
t
.
Run
(
fmt
.
Sprintf
(
"ulps%+02d"
,
ulp
),
func
(
t
*
testing.
T
) {
done
:=
make
(
chan
int
)
go
func
() {
defer
close
(
done
)
p
:=
plot
.
New
()
var
(
y1
=
100.0
y2
=
y1
)
switch
{
case
ulp
<
0
:
y2
=
math
.
Float64frombits
(
math
.
Float64bits
(
y1
)
-
uint64
(
-
ulp
))
case
ulp
>
0
:
y2
=
math
.
Float64frombits
(
math
.
Float64bits
(
y1
)
+
uint64
(
ulp
))
}
pts
,
err
:=
plotter
.
NewScatter
(plotter.
XYs
{
{
X
:
1
,
Y
:
y1
},
{
X
:
1
,
Y
:
y2
},
})
if
err
!=
nil
{
t
.
Errorf
(
"could not create scatter: %v"
,
err
)
return
}
p
.
Add
(
pts
)
c
:=
draw
.
NewCanvas
(
&
recorder.
Canvas
{},
100
,
100
)
p
.
Draw
(
c
)
}()
timeout
:=
time
.
NewTimer
(
100
*
time
.
Millisecond
)
defer
timeout
.
Stop
()
select
{
case
<-
done
:
case
<-
timeout
.
C
:
t
.
Fatalf
(
"could not create plot with small axis range within allotted time"
)
}
})
}
}
func
TestDrawGlyphBoxes
(
t
*
testing.
T
) {
cmpimg
.
CheckPlot
(
func
() {
p
:=
plot
.
New
()
p
.
Title
.
Text
=
"My very very very
\n
long Title"
p
.
X
.
Min
=
0
p
.
X
.
Max
=
10
p
.
Y
.
Min
=
0
p
.
Y
.
Max
=
10
p
.
X
.
Label
.
Text
=
"X-axis"
p
.
Y
.
Label
.
Text
=
"Y-axis"
f1
:=
plotter
.
NewFunction
(
func
(
x
float64
)
float64
{
return
5
})
f1
.
LineStyle
.
Color
=
color.
RGBA
{
R
:
255
,
A
:
255
}
f2
:=
plotter
.
NewFunction
(
func
(
x
float64
)
float64
{
return
6
})
f2
.
LineStyle
.
Color
=
color.
RGBA
{
B
:
255
,
A
:
255
}
labels
,
err
:=
plotter
.
NewLabels
(plotter.
XYLabels
{
XYs
: []plotter.
XY
{
{
X
:
2.5
,
Y
:
2.5
},
{
X
:
7.5
,
Y
:
2.5
},
{
X
:
7.5
,
Y
:
7.5
},
{
X
:
2.5
,
Y
:
7.5
},
},
Labels
: []
string
{
"Agg"
,
"Bgg"
,
"Cgg"
,
"Dgg"
},
})
if
err
!=
nil
{
t
.
Fatalf
(
"could not creates labels plotter: %+v"
,
err
)
}
p
.
Add
(
f1
,
f2
,
labels
)
p
.
Add
(
plotter
.
NewGrid
())
p
.
Legend
.
Add
(
"fg1"
,
f1
)
p
.
Legend
.
Add
(
"fg2"
,
f2
)
p
.
Legend
.
Top
=
true
c
:=
vgimg.
PngCanvas
{
Canvas
:
vgimg
.
New
(
20
*
vg
.
Centimeter
,
15
*
vg
.
Centimeter
),
}
d
:=
draw
.
New
(
c
)
p
.
Draw
(
d
)
p
.
DrawGlyphBoxes
(
d
)
buf
:=
new
(bytes.
Buffer
)
_
,
err
=
c
.
WriteTo
(
buf
)
if
err
!=
nil
{
t
.
Fatalf
(
"error: %+v"
,
err
)
}
err
=
os
.
WriteFile
(
"testdata/glyphbox.png"
,
buf
.
Bytes
(),
0644
)
if
err
!=
nil
{
t
.
Fatalf
(
"could not save plot: %+v"
,
err
)
}
},
t
,
"glyphbox.png"
)
}
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