| 26 | ) |
| 27 | |
| 28 | func TestLegendAlignment(t *testing.T) { |
| 29 | l := plot.Legend{ |
| 30 | ThumbnailWidth: vg.Points(20), |
| 31 | TextStyle: text.Style{ |
| 32 | Font: font.From(plot.DefaultFont, 10), |
| 33 | Handler: plot.DefaultTextHandler, |
| 34 | }, |
| 35 | } |
| 36 | for i, n := range []string{"A", "B", "C", "D"} { |
| 37 | b, err := plotter.NewBarChart(plotter.Values{0}, 1) |
| 38 | if err != nil { |
| 39 | t.Fatalf("failed to create bar chart %q: %v", n, err) |
| 40 | } |
| 41 | b.Color = color.Gray{byte(i+1)*64 - 1} |
| 42 | l.Add(n, b) |
| 43 | } |
| 44 | |
| 45 | c := vgimg.PngCanvas{Canvas: vgimg.New(5*vg.Centimeter, 5*vg.Centimeter)} |
| 46 | l.Draw(draw.New(c)) |
| 47 | var buf bytes.Buffer |
| 48 | if _, err := c.WriteTo(&buf); err != nil { |
| 49 | t.Fatal(err) |
| 50 | } |
| 51 | |
| 52 | if *cmpimg.GenerateTestData { |
| 53 | // Recreate Golden images and exit. |
| 54 | err := os.WriteFile("testdata/legendAlignment_golden.png", buf.Bytes(), 0o644) |
| 55 | if err != nil { |
| 56 | t.Fatal(err) |
| 57 | } |
| 58 | return |
| 59 | } |
| 60 | |
| 61 | err := os.WriteFile("testdata/legendAlignment.png", buf.Bytes(), 0o644) |
| 62 | if err != nil { |
| 63 | t.Fatal(err) |
| 64 | } |
| 65 | |
| 66 | want, err := os.ReadFile("testdata/legendAlignment_golden.png") |
| 67 | if err != nil { |
| 68 | t.Fatal(err) |
| 69 | } |
| 70 | |
| 71 | ok, err := cmpimg.Equal("png", buf.Bytes(), want) |
| 72 | if err != nil { |
| 73 | t.Fatal(err) |
| 74 | } |
| 75 | if !ok { |
| 76 | t.Fatalf("images differ") |
| 77 | } |
| 78 | |
| 79 | } |
| 80 | |
| 81 | func TestIssue514(t *testing.T) { |
| 82 | for _, ulp := range []int{ |