Esempio n. 1
0
func plotLine(xy plotter.XYs) (image.Image, error) {

	p, err := plot.New()
	if err != nil {
		return nil, err
	}
	p.HideAxes()
	p.BackgroundColor = &color.RGBA{0, 0, 0, 255}

	//s, err := NewSparkLines(xy)
	s, err := plotter.NewLine(xy)
	if err != nil {
		return nil, err
	}
	s.Color = &color.RGBA{0, 255, 0, 128}
	p.Add(s)

	// Draw the plot to an in-memory image.
	// _, rows, _ := terminal.GetSize(0)
	charWidth := optCharWidth
	charHeight := optCharHeight
	//width := cols * charWidth
	height := optRows * charHeight

	img := image.NewRGBA(image.Rect(0, 0, 5+(len(xy)*charWidth), height))
	canvas := vgimg.NewImage(img)
	da := plot.MakeDrawArea(canvas)
	p.Draw(da)

	return img, nil
}
Esempio n. 2
0
// crosshair draws a plus at the given point.
func crosshair(img draw.Image, x, y int, str string) {
	c := vgimg.NewImage(img)

	// drawPlots here because NewImage
	// clears the canvas.  Instead, the canvas
	// should just be stored instead of being
	// recreated at each redraw.
	drawPlots(img)

	c.SetColor(color.RGBA{R: 255, A: 255})

	xc := vg.Inches(float64(x) / c.DPI())
	yc := vg.Inches(float64(y) / c.DPI())
	radius := vg.Points(5)

	var p vg.Path
	p.Move(xc-radius, yc)
	p.Line(xc+radius, yc)
	c.Stroke(p)

	p = vg.Path{}
	p.Move(xc, yc+radius)
	p.Line(xc, yc-radius)
	c.Stroke(p)

	c.SetColor(color.Black)
	c.FillString(font, vg.Length(0), vg.Length(0), str)
}
Esempio n. 3
0
// drawPlots draws the plots to an image.
func drawPlots(img draw.Image) {
	c := vgimg.NewImage(img)
	da := plot.MakeDrawArea(c)

	textAreaSize := vg.Points(12)
	da.Min.Y += textAreaSize
	da.Size.Y -= textAreaSize

	left := da
	left.Size.X /= 2
	ps[0].plot.Draw(left)
	ps[0].dataArea = ps[0].plot.DataDrawArea(left)

	right := da
	right.Min.X = left.Min.X + left.Size.X
	right.Size.X /= 2
	ps[1].plot.Draw(right)
	ps[1].dataArea = ps[1].plot.DataDrawArea(right)
}
Esempio n. 4
0
func marshalPNG(r *http.Request, results []*metricData) []byte {
	p, err := plot.New()
	if err != nil {
		panic(err)
	}

	// set bg/fg colors
	bgcolor := string2Color(getString(r.FormValue("bgcolor"), "black"))
	p.BackgroundColor = bgcolor

	fgcolorstr := getString(r.FormValue("fgcolor"), "white")
	fgcolor := string2Color(fgcolorstr)
	p.Title.Color = fgcolor
	p.X.LineStyle.Color = fgcolor
	p.Y.LineStyle.Color = fgcolor
	p.X.Tick.LineStyle.Color = fgcolor
	p.Y.Tick.LineStyle.Color = fgcolor
	p.X.Tick.Label.Color = fgcolor
	p.Y.Tick.Label.Color = fgcolor
	p.X.Label.Color = fgcolor
	p.Y.Label.Color = fgcolor
	p.Legend.Color = fgcolor

	// set grid
	grid := plotter.NewGrid()
	grid.Vertical.Color = fgcolor
	grid.Horizontal.Color = fgcolor
	p.Add(grid)

	// line mode (ikruglow) TODO check values
	lineMode := getString(r.FormValue("lineMode"), "slope")

	// width and height
	width := getInt(r.FormValue("width"), 330)
	height := getInt(r.FormValue("height"), 250)

	// need different timeMarker's based on step size
	p.Title.Text = r.FormValue("title")
	p.X.Tick.Marker = makeTimeMarker(results[0].GetStepTime())

	hideLegend := getBool(r.FormValue("hideLegend"), false)

	graphOnly := getBool(r.FormValue("graphOnly"), false)
	if graphOnly {
		p.HideAxes()
	}

	if len(results) == 1 && results[0].color == "" {
		results[0].color = fgcolorstr
	}

	var lines []plot.Plotter
	for i, r := range results {
		l := NewResponsePlotter(r)

		l.LineStyle.Color = fgcolor

		// consolidate datapoints
		l.maybeConsolidateData(width)

		if r.drawAsInfinite {
			l.lineMode = "drawAsInfinite"
		} else {
			l.lineMode = lineMode
		}

		if r.color != "" {
			l.Color = string2Color(r.color)
		} else {
			l.Color = plotutil.Color(i)
		}

		lines = append(lines, l)

		if !graphOnly && !hideLegend {
			p.Legend.Add(r.GetName(), l)
		}
	}

	p.Add(lines...)

	p.Y.Max *= 1.05
	p.Y.Min *= 0.95

	// Draw the plot to an in-memory image.
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	da := plot.MakeDrawArea(vgimg.NewImage(img))
	p.Draw(da)

	var b bytes.Buffer
	if err := png.Encode(&b, img); err != nil {
		panic(err)
	}

	return b.Bytes()
}