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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/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, err := plot.New()
if err != nil {
log.Fatalf("error: %v\n", err)
}
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, err := plot.New()
if err != nil {
log.Fatalf("error: %v\n", err)
}
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{}
p.Y.Tick.Marker = plot.LogTicks{}
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)
}
}
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