Exemplo n.º 1
0
// WriterTo returns an io.WriterTo that will write the plot as
// the specified image format.
//
// Supported formats are:
//
//  eps, jpg|jpeg, pdf, png, svg, and tif|tiff.
func (p *Plot) WriterTo(w, h vg.Length, format string) (io.WriterTo, error) {
	var c interface {
		vg.CanvasSizer
		io.WriterTo
	}
	switch format {
	case "eps":
		c = vgeps.New(w, h)

	case "jpg", "jpeg":
		c = vgimg.JpegCanvas{Canvas: vgimg.New(w, h)}

	case "pdf":
		c = vgpdf.New(w, h)

	case "png":
		c = vgimg.PngCanvas{Canvas: vgimg.New(w, h)}

	case "svg":
		c = vgsvg.New(w, h)

	case "tif", "tiff":
		c = vgimg.TiffCanvas{Canvas: vgimg.New(w, h)}

	default:
		return nil, fmt.Errorf("unsupported format: %q", format)
	}
	p.Draw(draw.New(c))

	return c, nil
}
Exemplo n.º 2
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")
	}
}
Exemplo n.º 3
0
func main() {
	rand.Seed(int64(0))

	p, err := plot.New()
	if err != nil {
		panic(err)
	}

	p.Title.Text = "Plotutil example"
	p.X.Label.Text = "X"
	p.Y.Label.Text = "Y"

	err = plotutil.AddLinePoints(
		p,
		"First", randomPoints(15),
	)
	if err != nil {
		panic(err)
	}

	cnvs, err := vgx11.New(4*96, 4*96, "Example")
	if err != nil {
		panic(err)
	}

	p.Draw(draw.New(cnvs))
	cnvs.Paint()
	time.Sleep(5 * time.Second)

	err = plotutil.AddLinePoints(
		p,
		"Second", randomPoints(15),
		"Third", randomPoints(15),
	)
	if err != nil {
		panic(err)
	}

	p.Draw(draw.New(cnvs))
	cnvs.Paint()
	time.Sleep(10 * time.Second)

	// Save the plot to a PNG file.
	//        if err := p.Save(4, 4, "points.png"); err != nil {
	//                panic(err)
	//        }
}
Exemplo n.º 4
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")
	}
}