func ExampleHeatMap() {
m := unitGrid{mat64.NewDense(3, 4, []float64{
1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
})}
h := NewHeatMap(m, palette.Heat(12, 1))
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Heat map"
p.Add(h)
p.X.Padding = 0
p.Y.Padding = 0
p.X.Max = 3.5
p.Y.Max = 2.5
err = p.Save(100, 100, "testdata/heatMap.png")
if err != nil {
log.Panic(err)
}
}
func TestHeatMapWithContour(t *testing.T) {
if !*visualDebug {
return
}
m := unitGrid{mat64.NewDense(3, 4, []float64{
2, 1, 4, 3,
6, 7, 2, 5,
9, 10, 11, 12,
})}
h := NewHeatMap(m, palette.Heat(12, 1))
levels := []float64{1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5, 10.5, 11.5}
c := NewContour(m, levels, palette.Rainbow(10, palette.Blue, palette.Red, 1, 1, 1))
c.LineStyles[0].Width *= 5
plt, _ := plot.New()
plt.Add(h)
plt.Add(c)
plt.Add(NewGlyphBoxes())
plt.X.Padding = 0
plt.Y.Padding = 0
plt.X.Max = 3.5
plt.Y.Max = 2.5
plt.Save(7, 7, "heat.svg")
}
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")
}
}
func TestComplexContours(t *testing.T) {
if !*visualDebug {
return
}
for _, n := range []float64{0, 1, 2, 4, 8, 16, 32} {
data := make([]float64, 6400)
for i := range data {
r := float64(i/80) - 40
c := float64(i%80) - 40
data[i] = rand.NormFloat64()*n + math.Hypot(r, c)
}
m := unitGrid{mat64.NewDense(80, 80, data)}
levels := []float64{-1, 3, 7, 9, 13, 15, 19, 23, 27, 31}
c := NewContour(m, levels, palette.Rainbow(10, palette.Blue, palette.Red, 1, 1, 1))
plt, _ := plot.New()
plt.Add(c)
plt.X.Padding = 0
plt.Y.Padding = 0
plt.X.Max = 79.5
plt.Y.Max = 79.5
plt.Save(7, 7, fmt.Sprintf("complex_contour-%v.svg", n))
}
}
// Draw the plot logo.
func Example() {
p, err := plot.New()
if err != nil {
log.Panic(err)
}
DefaultLineStyle.Width = vg.Points(1)
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 := XYs{{0, 0}, {0, 1}, {0.5, 1}, {0.5, 0.6}, {0, 0.6}}
line, err := NewLine(pts)
if err != nil {
log.Panic(err)
}
scatter, err := NewScatter(pts)
if err != nil {
log.Panic(err)
}
p.Add(line, scatter)
pts = XYs{{1, 0}, {0.75, 0}, {0.75, 0.75}}
line, err = NewLine(pts)
if err != nil {
log.Panic(err)
}
scatter, err = NewScatter(pts)
if err != nil {
log.Panic(err)
}
p.Add(line, scatter)
pts = XYs{{0.5, 0.5}, {1, 0.5}}
line, err = NewLine(pts)
if err != nil {
log.Panic(err)
}
scatter, err = NewScatter(pts)
if err != nil {
log.Panic(err)
}
p.Add(line, scatter)
err = p.Save(100, 100, "testdata/plotLogo.png")
if err != nil {
log.Panic(err)
}
}
func main() {
var levels []float64
for l := 100.5; l < volcano.Matrix.(*mat64.Dense).Max(); l += 5 {
levels = append(levels, l)
}
c := plotter.NewContour(volcano, levels, palette.Rainbow(len(levels), (palette.Yellow+palette.Red)/2, palette.Blue, 1, 1, 1))
quarterStyle := draw.LineStyle{
Color: color.Black,
Width: vg.Points(0.5),
Dashes: []vg.Length{0.2, 0.4},
}
halfStyle := draw.LineStyle{
Color: color.Black,
Width: vg.Points(0.5),
Dashes: []vg.Length{5, 2, 1, 2},
}
c.LineStyles = append(c.LineStyles, quarterStyle, halfStyle, quarterStyle)
h := plotter.NewHeatMap(volcano, palette.Heat(len(levels)*2, 1))
p, err := plot.New()
if err != nil {
panic(err)
}
p.Title.Text = "Maunga Whau Volcano"
p.Add(h)
p.Add(c)
p.X.Padding = 0
p.Y.Padding = 0
_, p.X.Max, _, p.Y.Max = h.DataRange()
name := "example_volcano"
for _, ext := range []string{
".eps",
".pdf",
".svg",
".png",
".tiff",
".jpg",
} {
if err := p.Save(4, 4, name+ext); err != nil {
panic(err)
}
}
}
func lines(w vg.Length) (*plot.Plot, error) {
p, err := plot.New()
if err != nil {
return nil, err
}
pts := plotter.XYs{{0, 0}, {0, 1}, {1, 0}, {1, 1}}
line, err := plotter.NewLine(pts)
line.Width = w
if err != nil {
return nil, err
}
p.Add(line)
return p, nil
}
func main() {
rand.Seed(0) // The default random seed is 1.
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)
// }
}
// An example of making a stacked area chart.
func Example_stackedAreaChart() *plot.Plot {
p, err := plot.New()
if err != nil {
panic(err)
}
p.Title.Text = "Example: Software Version Comparison"
p.X.Label.Text = "Date"
p.Y.Label.Text = "Users (in thousands)"
p.Legend.Top = true
p.Legend.Left = true
vals := []plotter.Values{
plotter.Values{0.02, 0.015, 0, 0, 0, 0, 0},
plotter.Values{0, 0.48, 0.36, 0.34, 0.32, 0.32, 0.28},
plotter.Values{0, 0, 0.87, 1.4, 0.64, 0.32, 0.28},
plotter.Values{0, 0, 0, 1.26, 0.34, 0.12, 0.09},
plotter.Values{0, 0, 0, 0, 2.48, 2.68, 2.13},
plotter.Values{0, 0, 0, 0, 0, 1.32, 0.54},
plotter.Values{0, 0, 0, 0, 0, 0.68, 5.67},
}
err = plotutil.AddStackedAreaPlots(p, plotter.Values{2007, 2008, 2009, 2010, 2011, 2012, 2013},
"Version 3.0",
stackValues{vs: vals[0:7]},
"Version 2.1",
stackValues{vs: vals[0:6]},
"Version 2.0.1",
stackValues{vs: vals[0:5]},
"Version 2.0",
stackValues{vs: vals[0:4]},
"Version 1.1",
stackValues{vs: vals[0:3]},
"Version 1.0",
stackValues{vs: vals[0:2]},
"Beta",
stackValues{vs: vals[0:1]},
)
if err != nil {
panic(err)
}
return p
}
func TestIssue179(t *testing.T) {
t.Skip("github.com/BurntSushi/xgbutil#30 issue not fixed")
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")
}
}
func ExampleErrorPoints() {
// Get some random data.
n, m := 5, 10
pts := make([]plotter.XYer, n)
for i := range pts {
xys := make(plotter.XYs, m)
pts[i] = xys
center := float64(i)
for j := range xys {
xys[j].X = center + (rand.Float64() - 0.5)
xys[j].Y = center + (rand.Float64() - 0.5)
}
}
plt, err := plot.New()
if err != nil {
panic(err)
}
mean95, err := NewErrorPoints(MeanAndConf95, pts...)
if err != nil {
panic(err)
}
medMinMax, err := NewErrorPoints(MedianAndMinMax, pts...)
if err != nil {
panic(err)
}
err = AddLinePoints(plt,
"mean and 95% confidence", mean95,
"median and minimum and maximum", medMinMax)
if err != nil {
panic(err)
}
if err := AddErrorBars(plt, mean95, medMinMax); err != nil {
panic(err)
}
if err := AddScatters(plt, pts[0], pts[1], pts[2], pts[3], pts[4]); err != nil {
panic(err)
}
plt.Save(4, 4, "centroids.png")
}
func ExampleBubbles() {
// randomTriples returns some random x, y, z triples
// with some interesting kind of trend.
randomTriples := func(n int) XYZs {
data := make(XYZs, n)
for i := range data {
if i == 0 {
data[i].X = rand.Float64()
} else {
data[i].X = data[i-1].X + 2*rand.Float64()
}
data[i].Y = data[i].X + 10*rand.Float64()
data[i].Z = data[i].X
}
return data
}
n := 10
bubbleData := randomTriples(n)
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Bubbles"
p.X.Label.Text = "X"
p.Y.Label.Text = "Y"
bs, err := NewBubbles(bubbleData, vg.Points(1), vg.Points(20))
if err != nil {
log.Panic(err)
}
bs.Color = color.RGBA{R: 196, B: 128, A: 255}
p.Add(bs)
err = p.Save(200, 200, "testdata/bubbles.png")
if err != nil {
log.Panic(err)
}
}
// ExampleFunction draws some functions.
func ExampleFunction() {
quad := NewFunction(func(x float64) float64 { return x * x })
quad.Color = color.RGBA{B: 255, A: 255}
exp := NewFunction(func(x float64) float64 { return math.Pow(2, x) })
exp.Dashes = []vg.Length{vg.Points(2), vg.Points(2)}
exp.Width = vg.Points(2)
exp.Color = color.RGBA{G: 255, A: 255}
sin := NewFunction(func(x float64) float64 { return 10*math.Sin(x) + 50 })
sin.Dashes = []vg.Length{vg.Points(4), vg.Points(5)}
sin.Width = vg.Points(4)
sin.Color = color.RGBA{R: 255, A: 255}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Functions"
p.X.Label.Text = "X"
p.Y.Label.Text = "Y"
p.Add(quad, exp, sin)
p.Legend.Add("x^2", quad)
p.Legend.Add("2^x", exp)
p.Legend.Add("10*sin(x)+50", sin)
p.Legend.ThumbnailWidth = 0.5 * vg.Inch
p.X.Min = 0
p.X.Max = 10
p.Y.Min = 0
p.Y.Max = 100
err = p.Save(200, 200, "testdata/functions.png")
if err != nil {
log.Panic(err)
}
}
// An example of making a histogram.
func ExampleHistogram() {
// stdNorm returns the probability of drawing a
// value from a standard normal distribution.
stdNorm := func(x float64) float64 {
const sigma = 1.0
const mu = 0.0
const root2π = 2.50662827459517818309
return 1.0 / (sigma * root2π) * math.Exp(-((x-mu)*(x-mu))/(2*sigma*sigma))
}
n := 10000
vals := make(Values, n)
for i := 0; i < n; i++ {
vals[i] = rand.NormFloat64()
}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Histogram"
h, err := NewHist(vals, 16)
if err != nil {
log.Panic(err)
}
h.Normalize(1)
p.Add(h)
// The normal distribution function
norm := NewFunction(stdNorm)
norm.Color = color.RGBA{R: 255, A: 255}
norm.Width = vg.Points(2)
p.Add(norm)
err = p.Save(200, 200, "testdata/histogram.png")
if err != nil {
log.Panic(err)
}
}
func ExampleBarChart() {
// Create the plot values and labels.
values := Values{0.5, 10, 20, 30}
verticalLabels := []string{"A", "B", "C", "D"}
horizontalLabels := []string{"Label A", "Label B", "Label C", "Label D"}
// Create a vertical BarChart
p1, err := plot.New()
if err != nil {
log.Panic(err)
}
verticalBarChart, err := NewBarChart(values, 0.5*vg.Centimeter)
if err != nil {
log.Panic(err)
}
p1.Add(verticalBarChart)
p1.NominalX(verticalLabels...)
err = p1.Save(100, 100, "testdata/verticalBarChart.png")
if err != nil {
log.Panic(err)
}
// Create a horizontal BarChart
p2, err := plot.New()
if err != nil {
log.Panic(err)
}
horizontalBarChart, err := NewBarChart(values, 0.5*vg.Centimeter)
horizontalBarChart.Horizontal = true // Specify a horizontal BarChart.
if err != nil {
log.Panic(err)
}
p2.Add(horizontalBarChart)
p2.NominalY(horizontalLabels...)
err = p2.Save(100, 100, "testdata/horizontalBarChart.png")
if err != nil {
log.Panic(err)
}
// Now, make a different type of BarChart.
groupA := Values{20, 35, 30, 35, 27}
groupB := Values{25, 32, 34, 20, 25}
groupC := Values{12, 28, 15, 21, 8}
groupD := Values{30, 42, 6, 9, 12}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Bar chart"
p.Y.Label.Text = "Heights"
w := vg.Points(8)
barsA, err := NewBarChart(groupA, w)
if err != nil {
log.Panic(err)
}
barsA.Color = color.RGBA{R: 255, A: 255}
barsA.Offset = -w / 2
barsB, err := NewBarChart(groupB, w)
if err != nil {
log.Panic(err)
}
barsB.Color = color.RGBA{R: 196, G: 196, A: 255}
barsB.Offset = w / 2
barsC, err := NewBarChart(groupC, w)
if err != nil {
log.Panic(err)
}
barsC.XMin = 6
barsC.Color = color.RGBA{B: 255, A: 255}
barsC.Offset = -w / 2
barsD, err := NewBarChart(groupD, w)
if err != nil {
log.Panic(err)
}
barsD.Color = color.RGBA{B: 255, R: 255, A: 255}
barsD.XMin = 6
barsD.Offset = w / 2
p.Add(barsA, barsB, barsC, barsD)
p.Legend.Add("A", barsA)
p.Legend.Add("B", barsB)
p.Legend.Add("C", barsC)
p.Legend.Add("D", barsD)
p.Legend.Top = true
p.NominalX("Zero", "One", "Two", "Three", "Four", "",
"Six", "Seven", "Eight", "Nine", "Ten")
p.Add(NewGlyphBoxes())
err = p.Save(300, 250, "testdata/barChart2.png")
if err != nil {
log.Panic(err)
}
// Now, make a stacked BarChart.
p, err = plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Bar chart"
p.Y.Label.Text = "Heights"
w = vg.Points(15)
barsA, err = NewBarChart(groupA, w)
if err != nil {
log.Panic(err)
}
barsA.Color = color.RGBA{R: 255, A: 255}
barsA.Offset = -w / 2
barsB, err = NewBarChart(groupB, w)
if err != nil {
log.Panic(err)
}
barsB.Color = color.RGBA{R: 196, G: 196, A: 255}
barsB.StackOn(barsA)
barsC, err = NewBarChart(groupC, w)
if err != nil {
log.Panic(err)
}
barsC.Offset = w / 2
barsC.Color = color.RGBA{B: 255, A: 255}
barsD, err = NewBarChart(groupD, w)
if err != nil {
log.Panic(err)
}
barsD.StackOn(barsC)
barsD.Color = color.RGBA{B: 255, R: 255, A: 255}
p.Add(barsA, barsB, barsC, barsD)
p.Legend.Add("A", barsA)
p.Legend.Add("B", barsB)
p.Legend.Add("C", barsC)
p.Legend.Add("D", barsD)
p.Legend.Top = true
p.NominalX("Zero", "One", "Two", "Three", "Four", "",
"Six", "Seven", "Eight", "Nine", "Ten")
p.Add(NewGlyphBoxes())
err = p.Save(250, 250, "testdata/stackedBarChart.png")
if err != nil {
log.Panic(err)
}
}
// ExampleErrors draws points and error bars.
func ExampleErrors() {
randomError := func(n int) Errors {
err := make(Errors, n)
for i := range err {
err[i].Low = rand.Float64()
err[i].High = rand.Float64()
}
return err
}
// randomPoints returns some random x, y points
// with some interesting kind of trend.
randomPoints := func(n int) XYs {
pts := make(XYs, n)
for i := range pts {
if i == 0 {
pts[i].X = rand.Float64()
} else {
pts[i].X = pts[i-1].X + rand.Float64()
}
pts[i].Y = pts[i].X + 10*rand.Float64()
}
return pts
}
type errPoints struct {
XYs
YErrors
XErrors
}
n := 15
data := errPoints{
XYs: randomPoints(n),
YErrors: YErrors(randomError(n)),
XErrors: XErrors(randomError(n)),
}
p, err := plot.New()
if err != nil {
log.Panic(err)
}
scatter, err := NewScatter(data)
if err != nil {
log.Panic(err)
}
scatter.Shape = draw.CrossGlyph{}
xerrs, err := NewXErrorBars(data)
if err != nil {
log.Panic(err)
}
yerrs, err := NewYErrorBars(data)
if err != nil {
log.Panic(err)
}
p.Add(scatter, xerrs, yerrs)
err = p.Save(200, 200, "testdata/errorBars.png")
if err != nil {
log.Panic(err)
}
}
func ExampleQuartPlot() {
// Create the example data.
n := 100
uniform := make(Values, n)
normal := make(Values, n)
expon := make(Values, n)
for i := 0; i < n; i++ {
uniform[i] = rand.Float64()
normal[i] = rand.NormFloat64()
expon[i] = rand.ExpFloat64()
}
// Create the QuartPlots
qp1, err := NewQuartPlot(0, uniform)
if err != nil {
log.Panic(err)
}
qp2, err := NewQuartPlot(1, normal)
if err != nil {
log.Panic(err)
}
qp3, err := NewQuartPlot(2, expon)
if err != nil {
log.Panic(err)
}
// Create a vertical plot
p1, err := plot.New()
if err != nil {
log.Panic(err)
}
p1.Title.Text = "Quartile Plot"
p1.Y.Label.Text = "plotter.Values"
p1.Add(qp1, qp2, qp3)
// Set the X axis of the plot to nominal with
// the given names for x=0, x=1 and x=2.
p1.NominalX("Uniform\nDistribution", "Normal\nDistribution",
"Exponential\nDistribution")
err = p1.Save(200, 200, "testdata/verticalQuartPlot.png")
if err != nil {
log.Panic(err)
}
// Create a horizontal plot
qp1.Horizontal = true
qp2.Horizontal = true
qp3.Horizontal = true
p2, err := plot.New()
if err != nil {
log.Panic(err)
}
p2.Title.Text = "Quartile Plot"
p2.X.Label.Text = "plotter.Values"
p2.Add(qp1, qp2, qp3)
// Set the Y axis of the plot to nominal with
// the given names for y=0, y=1 and y=2.
p2.NominalY("Uniform\nDistribution", "Normal\nDistribution",
"Exponential\nDistribution")
err = p2.Save(200, 200, "testdata/horizontalQuartPlot.png")
if err != nil {
log.Panic(err)
}
// Now, create a grouped quartile plot.
p3, err := plot.New()
if err != nil {
log.Panic(err)
}
p3.Title.Text = "Box Plot"
p3.Y.Label.Text = "plotter.Values"
w := vg.Points(10)
for x := 0.0; x < 3.0; x++ {
b0, err := NewQuartPlot(x, uniform)
if err != nil {
log.Panic(err)
}
b0.Offset = -w
b1, err := NewQuartPlot(x, normal)
if err != nil {
log.Panic(err)
}
b2, err := NewQuartPlot(x, expon)
if err != nil {
log.Panic(err)
}
b2.Offset = w
p3.Add(b0, b1, b2)
}
p3.Add(NewGlyphBoxes())
p3.NominalX("Group 0", "Group 1", "Group 2")
err = p3.Save(200, 200, "testdata/groupedQuartPlot.png")
if err != nil {
log.Panic(err)
}
}
func TestPersistency(t *testing.T) {
// Get some random points
rand.Seed(0) // The default random seed is 1.
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")
// }
}
func ExampleBoxPlot() {
// Create the sample data.
n := 100
uniform := make(ValueLabels, n)
normal := make(ValueLabels, n)
expon := make(ValueLabels, n)
for i := 0; i < n; i++ {
uniform[i].Value = rand.Float64()
uniform[i].Label = fmt.Sprintf("%4.4f", uniform[i].Value)
normal[i].Value = rand.NormFloat64()
normal[i].Label = fmt.Sprintf("%4.4f", normal[i].Value)
expon[i].Value = rand.ExpFloat64()
expon[i].Label = fmt.Sprintf("%4.4f", expon[i].Value)
}
// Make boxes for our data and add them to the plot.
uniBox, err := NewBoxPlot(vg.Points(20), 0, uniform)
if err != nil {
log.Panic(err)
}
normBox, err := NewBoxPlot(vg.Points(20), 1, normal)
if err != nil {
log.Panic(err)
}
expBox, err := NewBoxPlot(vg.Points(20), 2, expon)
if err != nil {
log.Panic(err)
}
// Make a vertical box plot.
uniLabels, err := uniBox.OutsideLabels(uniform)
if err != nil {
log.Panic(err)
}
normLabels, err := normBox.OutsideLabels(normal)
if err != nil {
log.Panic(err)
}
expLabels, err := expBox.OutsideLabels(expon)
if err != nil {
log.Panic(err)
}
p1, err := plot.New()
if err != nil {
log.Panic(err)
}
p1.Title.Text = "Vertical Box Plot"
p1.Y.Label.Text = "plotter.Values"
p1.Add(uniBox, uniLabels, normBox, normLabels, expBox, expLabels)
// Set the X axis of the plot to nominal with
// the given names for x=0, x=1 and x=2.
p1.NominalX("Uniform\nDistribution", "Normal\nDistribution",
"Exponential\nDistribution")
err = p1.Save(200, 200, "testdata/verticalBoxPlot.png")
if err != nil {
log.Panic(err)
}
// Now, make the same plot but horizontal.
normBox.Horizontal = true
expBox.Horizontal = true
uniBox.Horizontal = true
// We can use the same plotters but the labels need to be recreated.
uniLabels, err = uniBox.OutsideLabels(uniform)
if err != nil {
log.Panic(err)
}
normLabels, err = normBox.OutsideLabels(normal)
if err != nil {
log.Panic(err)
}
expLabels, err = expBox.OutsideLabels(expon)
if err != nil {
log.Panic(err)
}
p2, err := plot.New()
if err != nil {
log.Panic(err)
}
p2.Title.Text = "Horizontal Box Plot"
p2.X.Label.Text = "plotter.Values"
p2.Add(uniBox, uniLabels, normBox, normLabels, expBox, expLabels)
// Set the Y axis of the plot to nominal with
// the given names for y=0, y=1 and y=2.
p2.NominalY("Uniform\nDistribution", "Normal\nDistribution",
"Exponential\nDistribution")
err = p2.Save(200, 200, "testdata/horizontalBoxPlot.png")
if err != nil {
log.Panic(err)
}
// Now, make a grouped box plot.
p3, err := plot.New()
if err != nil {
log.Panic(err)
}
p3.Title.Text = "Box Plot"
p3.Y.Label.Text = "plotter.Values"
w := vg.Points(20)
for x := 0.0; x < 3.0; x++ {
b0, err := NewBoxPlot(w, x, uniform)
if err != nil {
log.Panic(err)
}
b0.Offset = -w - vg.Points(3)
b1, err := NewBoxPlot(w, x, normal)
if err != nil {
log.Panic(err)
}
b2, err := NewBoxPlot(w, x, expon)
if err != nil {
log.Panic(err)
}
b2.Offset = w + vg.Points(3)
p3.Add(b0, b1, b2)
}
// Add a GlyphBox plotter for debugging.
p3.Add(NewGlyphBoxes())
// Set the X axis of the plot to nominal with
// the given names for x=0, x=1 and x=2.
p3.NominalX("Group 0", "Group 1", "Group 2")
err = p3.Save(300, 300, "testdata/groupedBoxPlot.png")
if err != nil {
log.Panic(err)
}
}
// ExampleScatter draws some scatter points, a line,
// and a line with points.
func ExampleScatter() {
// randomPoints returns some random x, y points
// with some interesting kind of trend.
randomPoints := func(n int) XYs {
pts := make(XYs, n)
for i := range pts {
if i == 0 {
pts[i].X = rand.Float64()
} else {
pts[i].X = pts[i-1].X + rand.Float64()
}
pts[i].Y = pts[i].X + 10*rand.Float64()
}
return pts
}
n := 15
scatterData := randomPoints(n)
lineData := randomPoints(n)
linePointsData := randomPoints(n)
p, err := plot.New()
if err != nil {
log.Panic(err)
}
p.Title.Text = "Points Example"
p.X.Label.Text = "X"
p.Y.Label.Text = "Y"
p.Add(NewGrid())
s, err := NewScatter(scatterData)
if err != nil {
log.Panic(err)
}
s.GlyphStyle.Color = color.RGBA{R: 255, B: 128, A: 255}
s.GlyphStyle.Radius = vg.Points(3)
l, err := NewLine(lineData)
if err != nil {
log.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}
lpLine, lpPoints, err := NewLinePoints(linePointsData)
if err != nil {
log.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)
err = p.Save(200, 200, "testdata/scatter.png")
if err != nil {
log.Panic(err)
}
}