Example #1
0
File: canvas.go Project: zzn01/plot
// NewFormattedCanvas creates a new vg.CanvasWriterTo with the specified
// image format.
//
// Supported formats are:
//
//  eps, jpg|jpeg, pdf, png, svg, and tif|tiff.
func NewFormattedCanvas(w, h vg.Length, format string) (vg.CanvasWriterTo, error) {
	var c vg.CanvasWriterTo
	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)
	}
	return c, nil
}
Example #2
0
func plotSingle(df *DataFrame, name string) {
	p, err := plot.New()
	if err != nil {
		log.Fatal(err)
	}

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

	err = plotutil.AddLinePoints(p, name, df.PlotPoints())
	if err != nil {
		log.Fatal(err)
	}

	c := vgsvg.New(16*vg.Inch, 9*vg.Inch)

	can := draw.New(c)

	p.Draw(can)
	p.Save(16*vg.Inch/2, 9*vg.Inch/2, fmt.Sprintf("graphs/%s.png", name))
	f, err := os.Create(fmt.Sprintf("graphs/%s.svg", name))
	if err != nil {
		log.Fatal(err)
	}

	c.WriteTo(f)

}
Example #3
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
}
Example #4
0
func plotMulti(name string, names []string, frames []*DataFrame) {
	if len(names) != len(frames) {
		log.Fatal("wrong length for plots")
	}
	p, err := plot.New()
	if err != nil {
		log.Fatal(err)
	}

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

	lines := make([]interface{}, len(names)*2)
	x := 0
	for i := 0; i < len(lines); i += 2 {
		lines[i] = names[x]
		lines[i+1] = frames[x].PlotPoints()
		x += 1
	}

	err = plotutil.AddLinePoints(p, lines...)
	if err != nil {
		log.Fatal(err)
	}

	c := vgsvg.New(16*vg.Inch, 9*vg.Inch)

	can := draw.New(c)

	p.Draw(can)
	p.Save(16*vg.Inch/2, 9*vg.Inch/2, fmt.Sprintf("graphs/%s.png", name))
	f, err := os.Create(fmt.Sprintf("graphs/%s.svg", name))
	if err != nil {
		log.Fatal(err)
	}

	c.WriteTo(f)

}
Example #5
0
func (c *client) run() {
	var err error
	dir, err := ioutil.TempDir("", "snfusion-web-")
	if err != nil {
		log.Printf("error creating temporary directory: %v\n", err)
		return
	}

	defer func() {
		c.srv.unregister <- c
		c.ws.Close()
		c.srv = nil
		os.RemoveAll(dir)
	}()

	type params struct {
		ID         int     `json:"id"`
		NumIters   int     `json:"num_iters"`
		NumCarbons float64 `json:"num_carbons"`
		Seed       int64   `json:"seed"`
	}

	type genReply struct {
		ID     int        `json:"id"`
		Stage  string     `json:"stage"`
		Err    error      `json:"err"`
		Msg    string     `json:"msg"`
		Engine sim.Engine `json:"engine"`
	}

	type plotReply struct {
		ID    int    `json:"id"`
		Stage string `json:"stage"`
		Err   error  `json:"err"`
		SVG   string `json:"svg"`
	}

	type zipReply struct {
		ID    int    `json:"id"`
		Stage string `json:"stage"`
		Err   error  `json:"err"`
		Href  string `json:"href"`
	}

	for {
		param := params{
			NumIters:   100000,
			NumCarbons: 60,
			Seed:       1234,
		}

		log.Printf("waiting for simulation parameters...\n")
		err = websocket.JSON.Receive(c.ws, &param)
		if err != nil {
			log.Printf("error rcv: %v\n", err)
			return
		}
		id := param.ID

		msgbuf := new(bytes.Buffer)
		msg := log.New(msgbuf, "snfusion-sim: ", 0)
		engine := sim.Engine{
			NumIters:   param.NumIters,
			NumCarbons: param.NumCarbons,
			Seed:       param.Seed,
		}
		engine.SetLogger(msg)

		log.Printf("processing... %#v\n", engine)
		csvbuf := new(bytes.Buffer)
		errc := make(chan error)
		ticker := time.NewTicker(1 * time.Second)
		go func() {
			errc <- engine.Run(csvbuf)
			ticker.Stop()
		}()

		err = <-errc
		if err != nil {
			log.Printf("error: %v\n", err)
			_ = websocket.JSON.Send(c.ws, genReply{
				ID: id, Err: err, Engine: engine, Stage: "gen-done", Msg: msgbuf.String(),
			})
			return
		}

		err = websocket.JSON.Send(c.ws, genReply{
			ID: id, Err: err, Engine: engine, Stage: "gen-done", Msg: msgbuf.String(),
		})
		if err != nil {
			log.Printf("error sending data: %v\n", err)
			return
		}

		csvdata := make([]byte, len(csvbuf.Bytes()))
		copy(csvdata, csvbuf.Bytes())

		log.Printf("running post-processing...\n")
		r := csv.NewReader(csvbuf)
		r.Comma = ';'
		r.Comment = '#'

		table := make([]plotter.XYs, len(engine.Population))
		for i := range table {
			table[i] = make(plotter.XYs, engine.NumIters+1)
		}

		for ix := 0; ix < engine.NumIters+1; ix++ {
			var text []string
			text, err = r.Read()
			if err != nil {
				break
			}
			for i := range engine.Population {
				table[i][ix].X = float64(ix)
				table[i][ix].Y = float64(atoi(text[i]))
			}
		}
		if err == io.EOF {
			err = nil
		}
		if err != nil {
			log.Printf("error reading data: %v\n", err)
			return
		}

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

		p.Title.Text = fmt.Sprintf(
			"Time evolution of nuclei C%v-O%v (seed=%d)",
			engine.NumCarbons,
			100-engine.NumCarbons,
			engine.Seed,
		)
		p.X.Label.Text = "Iteration number"
		p.Y.Label.Text = "Atomic mass of nuclei"

		for i, n := range engine.Population {

			line, err := plotter.NewLine(table[i])
			if err != nil {
				log.Fatalf(
					"error adding data points for nucleus %v: %v\n",
					n, err,
				)
			}
			line.LineStyle.Color = col(n)
			line.LineStyle.Width = vg.Points(1)
			p.Add(line)
			p.Legend.Add(label(n), line)
		}

		p.Add(plotter.NewGrid())
		p.Legend.Top = true
		p.Legend.XOffs = -1 * vg.Centimeter

		figX := 25 * vg.Centimeter
		figY := figX / vg.Length(math.Phi)

		// Create a Canvas for writing SVG images.
		canvas := vgsvg.New(figX, figY)

		// Draw to the Canvas.
		p.Draw(draw.New(canvas))

		outsvg := new(bytes.Buffer)
		_, err = canvas.WriteTo(outsvg)
		if err != nil {
			log.Printf("error svg: %v\n", err)
			return
		}

		err = websocket.JSON.Send(c.ws, plotReply{
			ID: id, Err: err, SVG: outsvg.String(), Stage: "plot-done",
		})
		if err != nil {
			log.Printf("error sending data: %v\n", err)
			return
		}

		pngcanvas := vgimg.PngCanvas{Canvas: vgimg.New(figX, figY)}
		p.Draw(draw.New(pngcanvas))
		outpng := new(bytes.Buffer)
		_, err = pngcanvas.WriteTo(outpng)
		if err != nil {
			log.Printf("error png: %v\n", err)
			return
		}

		href := filepath.Join(dir, fmt.Sprintf("output-%d.zip", id))
		zipf, err := os.Create(href)
		if err != nil {
			log.Printf("error creating zip file: %v\n", err)
		}
		defer zipf.Close()

		zipw := zip.NewWriter(zipf)
		defer zipw.Close()

		for _, file := range []struct {
			Name string
			Body []byte
		}{
			{"output.csv", csvdata},
			{"output.png", outpng.Bytes()},
		} {
			ff, err := zipw.Create(file.Name)
			if err != nil {
				log.Printf("error creating zip content %v: %v\n", file.Name, err)
				return
			}
			_, err = ff.Write(file.Body)
			if err != nil {
				log.Printf("error writing zip content %v: %v\n", file.Name, err)
				return
			}
		}
		err = zipw.Close()
		if err != nil {
			log.Printf("error closing zip-writer: %v\n", err)
			return
		}
		err = zipf.Close()
		if err != nil {
			log.Printf("error closing zip-file: %v\n", err)
			return
		}

		err = websocket.JSON.Send(c.ws, zipReply{
			ID: id, Err: err, Href: href, Stage: "zip-done",
		})
		if err != nil {
			log.Printf("error sending zip: %v\n", err)
			return
		}
		log.Printf("saved report under %v\n", href)
	}

}