Esempio n. 1
0
// Draw the plotinum logo.
func Example_logo() *plot.Plot {
	p, err := plot.New()
	if err != nil {
		panic(err)
	}

	plotter.DefaultLineStyle.Width = vg.Points(1)
	plotter.DefaultGlyphStyle.Radius = vg.Points(3)

	p.Y.Tick.Marker = plot.ConstantTicks([]plot.Tick{
		{0, "0"}, {0.25, ""}, {0.5, "0.5"}, {0.75, ""}, {1, "1"},
	})
	p.X.Tick.Marker = plot.ConstantTicks([]plot.Tick{
		{0, "0"}, {0.25, ""}, {0.5, "0.5"}, {0.75, ""}, {1, "1"},
	})

	pts := plotter.XYs{{0, 0}, {0, 1}, {0.5, 1}, {0.5, 0.6}, {0, 0.6}}
	line := must(plotter.NewLine(pts)).(*plotter.Line)
	scatter := must(plotter.NewScatter(pts)).(*plotter.Scatter)
	p.Add(line, scatter)

	pts = plotter.XYs{{1, 0}, {0.75, 0}, {0.75, 0.75}}
	line = must(plotter.NewLine(pts)).(*plotter.Line)
	scatter = must(plotter.NewScatter(pts)).(*plotter.Scatter)
	p.Add(line, scatter)

	pts = plotter.XYs{{0.5, 0.5}, {1, 0.5}}
	line = must(plotter.NewLine(pts)).(*plotter.Line)
	scatter = must(plotter.NewScatter(pts)).(*plotter.Scatter)
	p.Add(line, scatter)

	return p
}
Esempio n. 2
0
// Example_errBars draws points and error bars.
func Example_errBars() *plot.Plot {

	type errPoints struct {
		plotter.XYs
		plotter.YErrors
		plotter.XErrors
	}

	rand.Seed(int64(0))
	n := 15
	data := errPoints{
		XYs:     randomPoints(n),
		YErrors: plotter.YErrors(randomError(n)),
		XErrors: plotter.XErrors(randomError(n)),
	}

	p, err := plot.New()
	if err != nil {
		panic(err)
	}
	scatter := must(plotter.NewScatter(data)).(*plotter.Scatter)
	scatter.Shape = draw.CrossGlyph{}
	xerrs, err := plotter.NewXErrorBars(data)
	if err != nil {
		panic(err)
	}
	yerrs, err := plotter.NewYErrorBars(data)
	if err != nil {
		panic(err)
	}
	p.Add(scatter, xerrs, yerrs)
	p.Add(plotter.NewGlyphBoxes())

	return p
}
Esempio n. 3
0
// AddScatters adds Scatter plotters to a plot.
// The variadic arguments must be either strings
// or plotter.XYers.  Each plotter.XYer is added to
// the plot using the next color, and glyph shape
// via the Color and Shape functions. If a
// plotter.XYer is immediately preceeded by
// a string then a legend entry is added to the plot
// using the string as the name.
//
// If an error occurs then none of the plotters are added
// to the plot, and the error is returned.
func AddScatters(plt *plot.Plot, vs ...interface{}) error {
	var ps []plot.Plotter
	names := make(map[*plotter.Scatter]string)
	name := ""
	var i int
	for _, v := range vs {
		switch t := v.(type) {
		case string:
			name = t

		case plotter.XYer:
			s, err := plotter.NewScatter(t)
			if err != nil {
				return err
			}
			s.Color = Color(i)
			s.Shape = Shape(i)
			i++
			ps = append(ps, s)
			if name != "" {
				names[s] = name
				name = ""
			}

		default:
			panic(fmt.Sprintf("AddScatters handles strings and plotter.XYers, got %T", t))
		}
	}
	plt.Add(ps...)
	for p, n := range names {
		plt.Legend.Add(n, p)
	}
	return nil
}
Esempio n. 4
0
func TestIssue179(t *testing.T) {
	scatter, err := plotter.NewScatter(plotter.XYs{{1, 1}, {0, 1}, {0, 0}})
	if err != nil {
		log.Fatal(err)
	}
	p, err := plot.New()
	if err != nil {
		log.Fatal(err)
	}
	p.Add(scatter)
	p.HideAxes()

	c := vgimg.JpegCanvas{Canvas: vgimg.New(5.08*vg.Centimeter, 5.08*vg.Centimeter)}
	p.Draw(draw.New(c))
	b := bytes.NewBuffer([]byte{})
	if _, err = c.WriteTo(b); err != nil {
		t.Error(err)
	}

	f, err := os.Open(filepath.Join("testdata", "issue179.jpg"))
	if err != nil {
		t.Error(err)
	}
	defer f.Close()

	want, err := ioutil.ReadAll(f)
	if err != nil {
		t.Error(err)
	}
	if !bytes.Equal(b.Bytes(), want) {
		t.Error("Image mismatch")
	}
}
Esempio n. 5
0
func TestIssue179(t *testing.T) {
	if !hasX11() {
		t.Skip("no X11 environment")
	}

	scatter, err := plotter.NewScatter(plotter.XYs{{1, 1}, {0, 1}, {0, 0}})
	if err != nil {
		t.Fatalf("error: %v\n", err)
	}
	p, err := plot.New()
	if err != nil {
		t.Fatalf("error: %v\n", err)
	}
	p.Add(scatter)
	p.HideAxes()

	c, err := New(5.08*vg.Centimeter, 5.08*vg.Centimeter, "test issue179")
	if err != nil {
		t.Fatalf("error: %v\n", err)
	}

	p.Draw(draw.New(c))
	b := bytes.NewBuffer([]byte{})
	err = jpeg.Encode(b, c.ximg, nil)
	if err != nil {
		t.Error(err)
	}

	f, err := os.Open(filepath.Join("..", "vgimg", "testdata", "issue179.jpg"))
	if err != nil {
		t.Error(err)
	}
	defer f.Close()

	want, err := ioutil.ReadAll(f)
	if err != nil {
		t.Error(err)
	}
	if !bytes.Equal(b.Bytes(), want) {
		t.Error("Image mismatch")
	}
}
Esempio n. 6
0
// Example_points draws some scatter points, a line,
// and a line with points.
func Example_points() *plot.Plot {
	rand.Seed(int64(0))

	n := 15
	scatterData := randomPoints(n)
	lineData := randomPoints(n)
	linePointsData := randomPoints(n)

	p, err := plot.New()
	if err != nil {
		panic(err)
	}
	p.Title.Text = "Points Example"
	p.X.Label.Text = "X"
	p.Y.Label.Text = "Y"
	p.Add(plotter.NewGrid())

	s := must(plotter.NewScatter(scatterData)).(*plotter.Scatter)
	s.GlyphStyle.Color = color.RGBA{R: 255, B: 128, A: 255}
	s.GlyphStyle.Radius = vg.Points(3)

	l := must(plotter.NewLine(lineData)).(*plotter.Line)
	l.LineStyle.Width = vg.Points(1)
	l.LineStyle.Dashes = []vg.Length{vg.Points(5), vg.Points(5)}
	l.LineStyle.Color = color.RGBA{B: 255, A: 255}

	lpLine, lpPoints, err := plotter.NewLinePoints(linePointsData)
	if err != nil {
		panic(err)
	}
	lpLine.Color = color.RGBA{G: 255, A: 255}
	lpPoints.Shape = draw.CircleGlyph{}
	lpPoints.Color = color.RGBA{R: 255, A: 255}

	p.Add(s, l, lpLine, lpPoints)
	p.Legend.Add("scatter", s)
	p.Legend.Add("line", l)
	p.Legend.Add("line points", lpLine, lpPoints)

	return p
}
Esempio n. 7
0
func TestPersistency(t *testing.T) {
	// Get some random points
	rand.Seed(0)
	n := 15
	scatterData := randomPoints(n)
	lineData := randomPoints(n)
	linePointsData := randomPoints(n)

	p, err := plot.New()
	if err != nil {
		t.Fatalf("error creating plot: %v\n", err)
	}

	p.Title.Text = "Plot Example"
	p.X.Label.Text = "X"
	p.Y.Label.Text = "Y"
	// Use a custom tick marker function that computes the default
	// tick marks and re-labels the major ticks with commas.
	p.Y.Tick.Marker = commaTicks{}

	// Draw a grid behind the data
	p.Add(plotter.NewGrid())
	// Make a scatter plotter and set its style.
	s, err := plotter.NewScatter(scatterData)
	if err != nil {
		panic(err)
	}
	s.GlyphStyle.Color = color.RGBA{R: 255, B: 128, A: 255}

	// Make a line plotter and set its style.
	l, err := plotter.NewLine(lineData)
	if err != nil {
		panic(err)
	}
	l.LineStyle.Width = vg.Points(1)
	l.LineStyle.Dashes = []vg.Length{vg.Points(5), vg.Points(5)}
	l.LineStyle.Color = color.RGBA{B: 255, A: 255}

	// Make a line plotter with points and set its style.
	lpLine, lpPoints, err := plotter.NewLinePoints(linePointsData)
	if err != nil {
		panic(err)
	}
	lpLine.Color = color.RGBA{G: 255, A: 255}
	lpPoints.Shape = draw.PyramidGlyph{}
	lpPoints.Color = color.RGBA{R: 255, A: 255}

	// Add the plotters to the plot, with a legend
	// entry for each
	p.Add(s, l, lpLine, lpPoints)
	p.Legend.Add("scatter", s)
	p.Legend.Add("line", l)
	p.Legend.Add("line points", lpLine, lpPoints)

	// Save the plot to a PNG file.
	err = p.Save(4, 4, "test-persistency.png")
	if err != nil {
		t.Fatalf("error saving to PNG: %v\n", err)
	}
	defer os.Remove("test-persistency.png")

	buf := new(bytes.Buffer)
	enc := gob.NewEncoder(buf)
	err = enc.Encode(p)
	if err != nil {
		t.Fatalf("error gob-encoding plot: %v\n", err)
	}

	// TODO(sbinet): impl. BinaryMarshal for plot.Plot and vg.Font
	// {
	// 	dec := gob.NewDecoder(buf)
	// 	var p plot.Plot
	// 	err = dec.Decode(&p)
	// 	if err != nil {
	// 		t.Fatalf("error gob-decoding plot: %v\n", err)
	// 	}
	// 	// Save the plot to a PNG file.
	// 	err = p.Save(4, 4, "test-persistency-readback.png")
	// 	if err != nil {
	// 		t.Fatalf("error saving to PNG: %v\n", err)
	// 	}
	//  defer os.Remove("test-persistency-readback.png")
	// }

}