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plot/plotter/image_example_test.go at master · gonum/plot · GitHub
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image_example_test.go
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// Copyright ©2016 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
(
"image"
"image/color"
"image/png"
"log"
"os"
"gonum.org/v1/plot"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
)
// An example of embedding an image in a plot.
func
ExampleImage
() {
p
:=
plot
.
New
()
p
.
Title
.
Text
=
"A Logo"
// load an image
f
,
err
:=
os
.
Open
(
"testdata/image_plot_input.png"
)
if
err
!=
nil
{
log
.
Fatalf
(
"error opening image file: %v
\n
"
,
err
)
}
defer
f
.
Close
()
img
,
err
:=
png
.
Decode
(
f
)
if
err
!=
nil
{
log
.
Fatalf
(
"error decoding image file: %v
\n
"
,
err
)
}
p
.
Add
(
plotter
.
NewImage
(
img
,
100
,
100
,
200
,
200
))
const
(
w
=
5
*
vg
.
Centimeter
h
=
5
*
vg
.
Centimeter
)
err
=
p
.
Save
(
w
,
h
,
"testdata/image_plot.png"
)
if
err
!=
nil
{
log
.
Fatalf
(
"error saving image plot: %v
\n
"
,
err
)
}
}
// An example of embedding an image in a plot with non-linear axes.
func
ExampleImage_log
() {
p
:=
plot
.
New
()
p
.
Title
.
Text
=
"A Logo"
// load an image
f
,
err
:=
os
.
Open
(
"testdata/gopher.png"
)
if
err
!=
nil
{
log
.
Fatalf
(
"error opening image file: %v
\n
"
,
err
)
}
defer
f
.
Close
()
img
,
err
:=
png
.
Decode
(
f
)
if
err
!=
nil
{
log
.
Fatalf
(
"error decoding image file: %v
\n
"
,
err
)
}
p
.
Add
(
plotter
.
NewImage
(
img
,
100
,
100
,
10000
,
10000
))
// Transform axes.
p
.
X
.
Scale
=
plot.
LogScale
{}
p
.
Y
.
Scale
=
plot.
LogScale
{}
p
.
X
.
Tick
.
Marker
=
plot.
LogTicks
{
Prec
:
-
1
}
p
.
Y
.
Tick
.
Marker
=
plot.
LogTicks
{
Prec
:
3
}
const
(
w
=
5
*
vg
.
Centimeter
h
=
5
*
vg
.
Centimeter
)
err
=
p
.
Save
(
w
,
h
,
"testdata/image_plot_log.png"
)
if
err
!=
nil
{
log
.
Fatalf
(
"error saving image plot: %v
\n
"
,
err
)
}
}
// An example of embedding a uniform image in a plot.
func
ExampleImage_uniform
() {
p
:=
plot
.
New
()
p
.
Title
.
Text
=
"Uniform image"
img
:=
image
.
NewUniform
(color.
RGBA
{
R
:
90
,
G
:
155
,
B
:
212
,
A
:
255
})
p
.
Add
(
plotter
.
NewImage
(
img
,
100
,
100
,
10000
,
10000
))
const
(
w
=
5
*
vg
.
Centimeter
h
=
5
*
vg
.
Centimeter
)
err
:=
p
.
Save
(
w
,
h
,
"testdata/image_plot_uniform.png"
)
if
err
!=
nil
{
log
.
Fatalf
(
"error saving image plot: %v
\n
"
,
err
)
}
}
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