Function TestBarChartStack

plot/plots/plot_test.go:240–280

(t *testing.T)

}

func TestBarChartStack(t *testing.T) {
	pt := plot.New()
	pt.Title.Text = "Test Bar Chart Stacked"
	pt.X.Label.Text = "X Axis"
	pt.Y.Min = 0
	pt.Y.Max = 100
	pt.Y.Label.Text = "Y Axis"

	data := make(plot.Values, 21)
	for i := range data {
		x := float32(i % 21)
		data[i] = float32(50) + 40*math32.Sin((x/8)*math32.Pi)
	}

	cos := make(plot.Values, 21)
	for i := range data {
		x := float32(i % 21)
		cos[i] = float32(5) + 4*math32.Cos((x/8)*math32.Pi)
	}

	l1, err := NewBarChart(data, nil)
	if err != nil {
		t.Error(err.Error())
	}
	l1.Color = colors.Uniform(colors.Red)
	pt.Add(l1)
	pt.Legend.Add("Sine", l1)

	l2, err := NewBarChart(cos, nil)
	if err != nil {
		t.Error(err.Error())
	}
	l2.Color = colors.Uniform(colors.Blue)
	l2.StackedOn = l1
	pt.Add(l2)
	pt.Legend.Add("Cos", l2)

	pt.Resize(image.Point{640, 480})
	pt.Draw()
	imagex.Assert(t, pt.Pixels, "bar-stacked.png")
}

type XYErr struct {
	plot.XYs