Function TestDrawGlyphBoxes

plot_test.go:133–191

(t *testing.T)

}

func TestDrawGlyphBoxes(t *testing.T) {
	cmpimg.CheckPlot(func() {
		p := plot.New()

		p.Title.Text = "My very very very\nlong Title"
		p.X.Min = 0
		p.X.Max = 10
		p.Y.Min = 0
		p.Y.Max = 10

		p.X.Label.Text = "X-axis"
		p.Y.Label.Text = "Y-axis"

		f1 := plotter.NewFunction(func(x float64) float64 { return 5 })
		f1.LineStyle.Color = color.RGBA{R: 255, A: 255}

		f2 := plotter.NewFunction(func(x float64) float64 { return 6 })
		f2.LineStyle.Color = color.RGBA{B: 255, A: 255}

		labels, err := plotter.NewLabels(plotter.XYLabels{
			XYs: []plotter.XY{
				{X: 2.5, Y: 2.5},
				{X: 7.5, Y: 2.5},
				{X: 7.5, Y: 7.5},
				{X: 2.5, Y: 7.5},
			},
			Labels: []string{"Agg", "Bgg", "Cgg", "Dgg"},
		})
		if err != nil {
			t.Fatalf("could not creates labels plotter: %+v", err)
		}

		p.Add(f1, f2, labels)
		p.Add(plotter.NewGrid())

		p.Legend.Add("fg1", f1)
		p.Legend.Add("fg2", f2)
		p.Legend.Top = true

		c := vgimg.PngCanvas{
			Canvas: vgimg.New(20*vg.Centimeter, 15*vg.Centimeter),
		}

		d := draw.New(c)
		p.Draw(d)
		p.DrawGlyphBoxes(d)

		buf := new(bytes.Buffer)
		_, err = c.WriteTo(buf)
		if err != nil {
			t.Fatalf("error: %+v", err)
		}

		err = os.WriteFile("testdata/glyphbox_"+runtime.GOARCH+".png", buf.Bytes(), 0644)
		if err != nil {
			t.Fatalf("could not save plot: %+v", err)
		}
	}, t, "glyphbox_"+runtime.GOARCH+".png")