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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 vg_test
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"path/filepath"
"testing"
"gonum.org/v1/plot"
"gonum.org/v1/plot/cmpimg"
"gonum.org/v1/plot/plotter"
"gonum.org/v1/plot/vg"
)
// TestLineWidth tests output against test images generated by
// running tests with -tag good.
func TestLineWidth(t *testing.T) {
formats := []string{
// TODO: Add logic to cope with run to run eps differences.
"pdf",
"svg",
"png",
"tiff",
"jpg",
}
const (
width = 100
height = 100
)
for _, w := range []vg.Length{-1, 0, 1} {
for _, typ := range formats {
p, err := lines(w)
if err != nil {
log.Fatalf("failed to create plot for %v:%s: %v", w, typ, err)
}
c, err := p.WriterTo(width, height, typ)
if err != nil {
t.Fatalf("failed to render plot for %v:%s: %v", w, typ, err)
}
var buf bytes.Buffer
if _, err = c.WriteTo(&buf); err != nil {
t.Fatalf("failed to write plot for %v:%s: %v", w, typ, err)
}
name := filepath.Join(".", "testdata", fmt.Sprintf("width_%v.%s", w, typ))
// Recreate Golden images.
if *cmpimg.GenerateTestData {
err = p.Save(width, height, name)
if err != nil {
log.Fatalf("failed to save %q: %v", name, err)
}
}
want, err := ioutil.ReadFile(name)
if err != nil {
t.Fatalf("failed to read test image [%s]: %v\n", name, err)
}
ok, err := cmpimg.Equal(typ, buf.Bytes(), want)
if err != nil {
t.Fatalf("failed to run cmpimg test [%s]: %v\n", name, err)
}
if !ok {
t.Errorf("image mismatch for %v:%s", w, typ)
}
}
}
}
func lines(w vg.Length) (*plot.Plot, error) {
p, err := plot.New()
if err != nil {
return nil, err
}
pts := plotter.XYs{{0, 0}, {0, 1}, {1, 0}, {1, 1}}
line, err := plotter.NewLine(pts)
line.Width = w
if err != nil {
return nil, err
}
p.Add(line)
p.X.Label.Text = "X label"
p.Y.Label.Text = "Y label"
return p, nil
}
func TestParseLength(t *testing.T) {
for _, table := range []struct {
str string
want vg.Length
err error
}{
{
str: "42.2cm",
want: 42.2 * vg.Centimeter,
},
{
str: "42.2mm",
want: 42.2 * vg.Millimeter,
},
{
str: "42.2in",
want: 42.2 * vg.Inch,
},
{
str: "42.2pt",
want: 42.2,
},
{
str: "42.2",
want: 42.2,
},
{
str: "999bottles",
err: fmt.Errorf(`strconv.ParseFloat: parsing "999bottles": invalid syntax`),
},
{
str: "42inch",
want: 42 * vg.Inch,
err: fmt.Errorf(`strconv.ParseFloat: parsing "42inch": invalid syntax`),
},
} {
v, err := vg.ParseLength(table.str)
if table.err != nil {
if err == nil {
t.Errorf("%s: expected an error (%v)\n",
table.str, table.err,
)
}
if table.err.Error() != err.Error() {
t.Errorf("%s: got error=%q. want=%q\n",
table.str, err.Error(), table.err.Error(),
)
}
continue
}
if err != nil {
t.Errorf("error setting flag.Value %q: %v\n",
table.str,
err,
)
}
if v != table.want {
t.Errorf("%s: incorrect value. got %v, want %v\n",
table.str,
float64(v), float64(table.want),
)
}
}
}
func TestInMemoryCanvas(t *testing.T) {
cmpimg.CheckPlot(Example_inMemoryCanvas, t, "sine.png")
}
func TestWriterToCanvas(t *testing.T) {
cmpimg.CheckPlot(Example_writerToCanvas, t, "cosine.png")
}
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