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plot/plot_test.go at master · igrmk/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"
"reflect"
"testing"
"github.com/igrmk/plot"
"github.com/igrmk/plot/plotter"
"github.com/igrmk/plot/vg"
"github.com/igrmk/plot/vg/draw"
"github.com/igrmk/plot/vg/recorder"
)
func
TestLegendAlignment
(
t
*
testing.
T
) {
const
fontSize
=
10.189054726368159
// This font size gives an entry height of 10.
font
,
err
:=
vg
.
MakeFont
(
plot
.
DefaultFont
,
fontSize
)
if
err
!=
nil
{
t
.
Fatalf
(
"failed to create font: %v"
,
err
)
}
l
:=
plot.
Legend
{
ThumbnailWidth
:
vg
.
Points
(
20
),
TextStyle
: draw.
TextStyle
{
Font
:
font
},
}
for
_
,
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
)
}
l
.
Add
(
n
,
b
)
}
var
r
recorder.
Canvas
c
:=
draw
.
NewCanvas
(
&
r
,
100
,
100
)
l
.
Draw
(draw.
Canvas
{
Canvas
:
c
.
Canvas
,
Rectangle
: vg.
Rectangle
{
Min
: vg.
Point
{
X
:
0
,
Y
:
0
},
Max
: vg.
Point
{
X
:
100
,
Y
:
100
},
},
})
got
:=
r
.
Actions
// want is a snapshot of the actions for the code above when the
// graphical output has been visually confirmed to be correct for
// the bar charts example show in gonum/plot#25.
want
:=
[]recorder.
Action
{
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
Fill
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
40
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
40
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
30
}},
{
Type
:
vg
.
CloseComp
},
},
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
SetLineWidth
{
Width
:
1
,
},
&
recorder.
SetLineDash
{},
&
recorder.
Stroke
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
40
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
40
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
30
}},
},
},
&
recorder.
SetColor
{},
&
recorder.
FillString
{
Font
:
string
(
"Times-Roman"
),
Size
:
fontSize
,
Point
: vg.
Point
{
X
:
70.09452736318407
,
Y
:
30.18905472636816
},
String
:
"A"
,
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
Fill
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
20
}},
{
Type
:
vg
.
CloseComp
},
},
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
SetLineWidth
{
Width
:
1
,
},
&
recorder.
SetLineDash
{},
&
recorder.
Stroke
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
30
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
20
}},
},
},
&
recorder.
SetColor
{},
&
recorder.
FillString
{
Font
:
string
(
"Times-Roman"
),
Size
:
fontSize
,
Point
: vg.
Point
{
X
:
70.65671641791045
,
Y
:
20.18905472636816
},
String
:
"B"
,
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{
Y
:
uint16
(
0
),
},
},
&
recorder.
Fill
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
10
}},
{
Type
:
vg
.
CloseComp
},
},
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
SetLineWidth
{
Width
:
1
,
},
&
recorder.
SetLineDash
{},
&
recorder.
Stroke
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
20
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
10
}},
},
},
&
recorder.
SetColor
{},
&
recorder.
FillString
{
Font
:
string
(
"Times-Roman"
),
Size
:
fontSize
,
Point
: vg.
Point
{
X
:
70.65671641791045
,
Y
:
10.189054726368159
},
String
:
"C"
,
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
Fill
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
0
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
0
}},
{
Type
:
vg
.
CloseComp
},
},
},
&
recorder.
SetColor
{
Color
: color.
Gray16
{},
},
&
recorder.
SetLineWidth
{
Width
:
1
,
},
&
recorder.
SetLineDash
{},
&
recorder.
Stroke
{
Path
: vg.
Path
{
{
Type
:
vg
.
MoveComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
0
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
10
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
100
,
Y
:
0
}},
{
Type
:
vg
.
LineComp
,
Pos
: vg.
Point
{
X
:
80
,
Y
:
0
}},
},
},
&
recorder.
SetColor
{},
&
recorder.
FillString
{
Font
:
string
(
"Times-Roman"
),
Size
:
fontSize
,
Point
: vg.
Point
{
X
:
70.09452736318407
,
Y
:
0.189054726368159
},
String
:
"D"
,
},
}
if
!
reflect
.
DeepEqual
(
got
,
want
) {
t
.
Errorf
(
"unexpected legend actions:
\n
got:
\n
%s
\n
want:
\n
%s"
,
formatActions
(
got
),
formatActions
(
want
))
t
.
Errorf
(
"First diff:
\n
%s"
,
printFirstDiff
(
got
,
want
))
}
}
func
formatActions
(
actions
[]recorder.
Action
)
string
{
var
buf
bytes.
Buffer
for
_
,
a
:=
range
actions
{
fmt
.
Fprintf
(
&
buf
,
"
\t
%s
\n
"
,
a
.
Call
())
}
return
buf
.
String
()
}
// printFirstDiff prints the first line that is different between two actions.
func
printFirstDiff
(
got
,
want
[]recorder.
Action
)
string
{
var
buf
bytes.
Buffer
for
i
,
g
:=
range
got
{
if
i
>=
len
(
want
) {
fmt
.
Fprintf
(
&
buf
,
"line %d:
\n
\t
got: %s
\n
\t
want is empty"
,
i
,
g
.
Call
())
break
}
w
:=
want
[
i
]
if
w
.
Call
()
!=
g
.
Call
() {
fmt
.
Fprintf
(
&
buf
,
"line %d:
\n
\t
got: %s
\n
\t
want: %s"
,
i
,
g
.
Call
(),
w
.
Call
())
break
}
}
if
len
(
want
)
>
len
(
got
) {
fmt
.
Fprintf
(
&
buf
,
"line %d:
\n
\t
want: %s
\n
\t
got is empty"
,
len
(
got
),
want
[
len
(
got
)].
Call
())
}
return
buf
.
String
()
}
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