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plot/plotter/errbars.go at master · patrickToca/plot · GitHub
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/
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errbars.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
import
(
"math"
"github.com/gonum/plot"
"github.com/gonum/plot/vg"
"github.com/gonum/plot/vg/draw"
)
// DefaultCapWidth is the default width of error bar caps.
var
DefaultCapWidth
=
vg
.
Points
(
5
)
// YErrorBars implements the plot.Plotter, plot.DataRanger,
// and plot.GlyphBoxer interfaces, drawing vertical error
// bars, denoting error in Y values.
type
YErrorBars
struct
{
XYs
// YErrors is a copy of the Y errors for each point.
YErrors
// LineStyle is the style used to draw the error bars.
draw.
LineStyle
// CapWidth is the width of the caps drawn at the top
// of each error bar.
CapWidth
vg.
Length
}
// Returns a new YErrorBars plotter, or an error on failure. The error values
// from the YErrorer interface are interpreted as relative to the corresponding
// Y value. The errors for a given Y value are computed by taking the absolute
// value of the error returned by the YErrorer and subtracting the first and
// adding the second to the Y value.
func
NewYErrorBars
(
yerrs
interface
{
XYer
YErrorer
}) (
*
YErrorBars
,
error
) {
errors
:=
make
(
YErrors
,
yerrs
.
Len
())
for
i
:=
range
errors
{
errors
[
i
].
Low
,
errors
[
i
].
High
=
yerrs
.
YError
(
i
)
if
err
:=
CheckFloats
(
errors
[
i
].
Low
,
errors
[
i
].
High
);
err
!=
nil
{
return
nil
,
err
}
}
xys
,
err
:=
CopyXYs
(
yerrs
)
if
err
!=
nil
{
return
nil
,
err
}
return
&
YErrorBars
{
XYs
:
xys
,
YErrors
:
errors
,
LineStyle
:
DefaultLineStyle
,
CapWidth
:
DefaultCapWidth
,
},
nil
}
// Plot implements the Plotter interface, drawing labels.
func
(
e
*
YErrorBars
)
Plot
(
c
draw.
Canvas
,
p
*
plot.
Plot
) {
trX
,
trY
:=
p
.
Transforms
(
&
c
)
for
i
,
err
:=
range
e
.
YErrors
{
x
:=
trX
(
e
.
XYs
[
i
].
X
)
ylow
:=
trY
(
e
.
XYs
[
i
].
Y
-
math
.
Abs
(
err
.
Low
))
yhigh
:=
trY
(
e
.
XYs
[
i
].
Y
+
math
.
Abs
(
err
.
High
))
bar
:=
c
.
ClipLinesY
([]draw.
Point
{{
x
,
ylow
}, {
x
,
yhigh
}})
c
.
StrokeLines
(
e
.
LineStyle
,
bar
...
)
e
.
drawCap
(
&
c
,
x
,
ylow
)
e
.
drawCap
(
&
c
,
x
,
yhigh
)
}
}
// drawCap draws the cap if it is not clipped.
func
(
e
*
YErrorBars
)
drawCap
(
c
*
draw.
Canvas
,
x
,
y
vg.
Length
) {
if
!
c
.
Contains
(draw.
Point
{
x
,
y
}) {
return
}
c
.
StrokeLine2
(
e
.
LineStyle
,
x
-
e
.
CapWidth
/
2
,
y
,
x
+
e
.
CapWidth
/
2
,
y
)
}
// DataRange implements the plot.DataRanger interface.
func
(
e
*
YErrorBars
)
DataRange
() (
xmin
,
xmax
,
ymin
,
ymax
float64
) {
xmin
,
xmax
=
Range
(
XValues
{
e
})
ymin
=
math
.
Inf
(
1
)
ymax
=
math
.
Inf
(
-
1
)
for
i
,
err
:=
range
e
.
YErrors
{
y
:=
e
.
XYs
[
i
].
Y
ylow
:=
y
-
math
.
Abs
(
err
.
Low
)
yhigh
:=
y
+
math
.
Abs
(
err
.
High
)
ymin
=
math
.
Min
(
math
.
Min
(
math
.
Min
(
ymin
,
y
),
ylow
),
yhigh
)
ymax
=
math
.
Max
(
math
.
Max
(
math
.
Max
(
ymax
,
y
),
ylow
),
yhigh
)
}
return
}
// GlyphBoxes implements the plot.GlyphBoxer interface.
func
(
e
*
YErrorBars
)
GlyphBoxes
(
plt
*
plot.
Plot
) []plot.
GlyphBox
{
rect
:=
draw.
Rectangle
{
Min
: draw.
Point
{
X
:
-
e
.
CapWidth
/
2
,
Y
:
-
e
.
LineStyle
.
Width
/
2
,
},
Max
: draw.
Point
{
X
:
+
e
.
CapWidth
/
2
,
Y
:
+
e
.
LineStyle
.
Width
/
2
,
},
}
var
bs
[]plot.
GlyphBox
for
i
,
err
:=
range
e
.
YErrors
{
x
:=
plt
.
X
.
Norm
(
e
.
XYs
[
i
].
X
)
y
:=
e
.
XYs
[
i
].
Y
bs
=
append
(
bs
,
plot.
GlyphBox
{
X
:
x
,
Y
:
plt
.
Y
.
Norm
(
y
-
err
.
Low
),
Rectangle
:
rect
},
plot.
GlyphBox
{
X
:
x
,
Y
:
plt
.
Y
.
Norm
(
y
+
err
.
High
),
Rectangle
:
rect
})
}
return
bs
}
// XErrorBars implements the plot.Plotter, plot.DataRanger,
// and plot.GlyphBoxer interfaces, drawing horizontal error
// bars, denoting error in Y values.
type
XErrorBars
struct
{
XYs
// XErrors is a copy of the X errors for each point.
XErrors
// LineStyle is the style used to draw the error bars.
draw.
LineStyle
// CapWidth is the width of the caps drawn at the top
// of each error bar.
CapWidth
vg.
Length
}
// Returns a new XErrorBars plotter, or an error on failure. The error values
// from the XErrorer interface are interpreted as relative to the corresponding
// X value. The errors for a given X value are computed by taking the absolute
// value of the error returned by the XErrorer and subtracting the first and
// adding the second to the X value.
func
NewXErrorBars
(
xerrs
interface
{
XYer
XErrorer
}) (
*
XErrorBars
,
error
) {
errors
:=
make
(
XErrors
,
xerrs
.
Len
())
for
i
:=
range
errors
{
errors
[
i
].
Low
,
errors
[
i
].
High
=
xerrs
.
XError
(
i
)
if
err
:=
CheckFloats
(
errors
[
i
].
Low
,
errors
[
i
].
High
);
err
!=
nil
{
return
nil
,
err
}
}
xys
,
err
:=
CopyXYs
(
xerrs
)
if
err
!=
nil
{
return
nil
,
err
}
return
&
XErrorBars
{
XYs
:
xys
,
XErrors
:
errors
,
LineStyle
:
DefaultLineStyle
,
CapWidth
:
DefaultCapWidth
,
},
nil
}
// Plot implements the Plotter interface, drawing labels.
func
(
e
*
XErrorBars
)
Plot
(
c
draw.
Canvas
,
p
*
plot.
Plot
) {
trX
,
trY
:=
p
.
Transforms
(
&
c
)
for
i
,
err
:=
range
e
.
XErrors
{
y
:=
trY
(
e
.
XYs
[
i
].
Y
)
xlow
:=
trX
(
e
.
XYs
[
i
].
X
-
math
.
Abs
(
err
.
Low
))
xhigh
:=
trX
(
e
.
XYs
[
i
].
X
+
math
.
Abs
(
err
.
High
))
bar
:=
c
.
ClipLinesX
([]draw.
Point
{{
xlow
,
y
}, {
xhigh
,
y
}})
c
.
StrokeLines
(
e
.
LineStyle
,
bar
...
)
e
.
drawCap
(
&
c
,
xlow
,
y
)
e
.
drawCap
(
&
c
,
xhigh
,
y
)
}
}
// drawCap draws the cap if it is not clipped.
func
(
e
*
XErrorBars
)
drawCap
(
c
*
draw.
Canvas
,
x
,
y
vg.
Length
) {
if
!
c
.
Contains
(draw.
Point
{
x
,
y
}) {
return
}
c
.
StrokeLine2
(
e
.
LineStyle
,
x
,
y
-
e
.
CapWidth
/
2
,
x
,
y
+
e
.
CapWidth
/
2
)
}
// DataRange implements the plot.DataRanger interface.
func
(
e
*
XErrorBars
)
DataRange
() (
xmin
,
xmax
,
ymin
,
ymax
float64
) {
ymin
,
ymax
=
Range
(
YValues
{
e
})
xmin
=
math
.
Inf
(
1
)
xmax
=
math
.
Inf
(
-
1
)
for
i
,
err
:=
range
e
.
XErrors
{
x
:=
e
.
XYs
[
i
].
X
xlow
:=
x
-
math
.
Abs
(
err
.
Low
)
xhigh
:=
x
+
math
.
Abs
(
err
.
High
)
xmin
=
math
.
Min
(
math
.
Min
(
math
.
Min
(
xmin
,
x
),
xlow
),
xhigh
)
xmax
=
math
.
Max
(
math
.
Max
(
math
.
Max
(
xmax
,
x
),
xlow
),
xhigh
)
}
return
}
// GlyphBoxes implements the plot.GlyphBoxer interface.
func
(
e
*
XErrorBars
)
GlyphBoxes
(
plt
*
plot.
Plot
) []plot.
GlyphBox
{
rect
:=
draw.
Rectangle
{
Min
: draw.
Point
{
X
:
-
e
.
LineStyle
.
Width
/
2
,
Y
:
-
e
.
CapWidth
/
2
,
},
Max
: draw.
Point
{
X
:
+
e
.
LineStyle
.
Width
/
2
,
Y
:
+
e
.
CapWidth
/
2
,
},
}
var
bs
[]plot.
GlyphBox
for
i
,
err
:=
range
e
.
XErrors
{
x
:=
e
.
XYs
[
i
].
X
y
:=
plt
.
Y
.
Norm
(
e
.
XYs
[
i
].
Y
)
bs
=
append
(
bs
,
plot.
GlyphBox
{
X
:
plt
.
X
.
Norm
(
x
-
err
.
Low
),
Y
:
y
,
Rectangle
:
rect
},
plot.
GlyphBox
{
X
:
plt
.
X
.
Norm
(
x
+
err
.
High
),
Y
:
y
,
Rectangle
:
rect
})
}
return
bs
}
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