// NewBoxPlot returns a new BoxPlot that represents
// the distribution of the given values. The style of
// the box plot is that used for Tukey's schematic
// plots is ``Exploratory Data Analysis.''
//
// An error is returned if the boxplot is created with
// no values.
//
// The fence values are 1.5x the interquartile before
// the first quartile and after the third quartile. Any
// value that is outside of the fences are drawn as
// Outside points. The adjacent values (to which the
// whiskers stretch) are the minimum and maximum
// values that are not outside the fences.
func NewBoxPlot(w vg.Length, loc float64, values Valuer) (*BoxPlot, error) {
if w < 0 {
return nil, errors.New("Negative boxplot width")
}
b := new(BoxPlot)
var err error
if b.fiveStatPlot, err = newFiveStat(w, loc, values); err != nil {
return nil, err
}
b.Width = w
b.CapWidth = 3 * w / 4
b.GlyphStyle = DefaultGlyphStyle
b.BoxStyle = DefaultLineStyle
b.MedianStyle = DefaultLineStyle
b.WhiskerStyle = draw.LineStyle{
Width: vg.Points(0.5),
Dashes: []vg.Length{vg.Points(4), vg.Points(2)},
}
if len(b.Values) == 0 {
b.Width = 0
b.GlyphStyle.Radius = 0
b.BoxStyle.Width = 0
b.MedianStyle.Width = 0
b.WhiskerStyle.Width = 0
}
return b, nil
}
// makeLegend returns a legend with the default
// parameter settings.
func makeLegend() (Legend, error) {
font, err := vg.MakeFont(DefaultFont, vg.Points(12))
if err != nil {
return Legend{}, err
}
return Legend{
ThumbnailWidth: vg.Points(20),
TextStyle: draw.TextStyle{Font: font},
}, nil
}
// 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)
}
}
}
// DrawGlyph implements the Glyph interface.
func (RingGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
c.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
var p vg.Path
p.Move(pt.X+sty.Radius, pt.Y)
p.Arc(pt.X, pt.Y, sty.Radius, 0, 2*math.Pi)
p.Close()
c.Stroke(p)
}
// DrawGlyph implements the Glyph interface.
func (TriangleGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
c.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
r := sty.Radius + (sty.Radius-sty.Radius*sinπover6)/2
var p vg.Path
p.Move(pt.X, pt.Y+r)
p.Line(pt.X-r*cosπover6, pt.Y-r*sinπover6)
p.Line(pt.X+r*cosπover6, pt.Y-r*sinπover6)
p.Close()
c.Stroke(p)
}
// DrawGlyph implements the Glyph interface.
func (SquareGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
c.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
x := (sty.Radius-sty.Radius*cosπover4)/2 + sty.Radius*cosπover4
var p vg.Path
p.Move(pt.X-x, pt.Y-x)
p.Line(pt.X+x, pt.Y-x)
p.Line(pt.X+x, pt.Y+x)
p.Line(pt.X-x, pt.Y+x)
p.Close()
c.Stroke(p)
}
// DrawGlyph implements the Glyph interface.
func (CrossGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
c.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
r := sty.Radius * cosπover4
var p vg.Path
p.Move(pt.X-r, pt.Y-r)
p.Line(pt.X+r, pt.Y+r)
c.Stroke(p)
p = vg.Path{}
p.Move(pt.X-r, pt.Y+r)
p.Line(pt.X+r, pt.Y-r)
c.Stroke(p)
}
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)
}
}
// AddStackedAreaPlots adds stacked area plot plotters to a plot.
// The variadic arguments must be either strings
// or plotter.Valuers. Each valuer adds a stacked area
// plot to the plot below the stacked area plots added
// before it. If a plotter.Valuer is immediately
// preceeded by a string then the string value is used to
// label the legend.
// Plots should be added in order of tallest to shortest,
// because they will be drawn in the order they are added
// (i.e. later plots will be painted over earlier plots).
//
// If an error occurs then none of the plotters are added
// to the plot, and the error is returned.
func AddStackedAreaPlots(plt *plot.Plot, xs plotter.Valuer, vs ...interface{}) error {
var ps []plot.Plotter
names := make(map[*plotter.Line]string)
name := ""
var i int
for _, v := range vs {
switch t := v.(type) {
case string:
name = t
case plotter.Valuer:
if xs.Len() != t.Len() {
return errors.New("X/Y length mismatch")
}
// Make a line plotter and set its style.
l, err := plotter.NewLine(combineXYs{xs: xs, ys: t})
if err != nil {
return err
}
l.LineStyle.Width = vg.Points(0)
color := Color(i)
i++
l.ShadeColor = &color
ps = append(ps, l)
if name != "" {
names[l] = name
name = ""
}
default:
panic(fmt.Sprintf("AddStackedAreaPlots handles strings and plotter.Valuers, got %T", t))
}
}
plt.Add(ps...)
for p, n := range names {
plt.Legend.Add(n, p)
}
return nil
}
// 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)
}
}
// 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)
}
}
// makeAxis returns a default Axis.
//
// The default range is (∞, ∞), and thus any finite
// value is less than Min and greater than Max.
func makeAxis() (Axis, error) {
labelFont, err := vg.MakeFont(DefaultFont, vg.Points(12))
if err != nil {
return Axis{}, err
}
tickFont, err := vg.MakeFont(DefaultFont, vg.Points(10))
if err != nil {
return Axis{}, err
}
a := Axis{
Min: math.Inf(1),
Max: math.Inf(-1),
LineStyle: draw.LineStyle{
Color: color.Black,
Width: vg.Points(0.5),
},
Padding: vg.Points(5),
Scale: LinearScale{},
}
a.Label.TextStyle = draw.TextStyle{
Color: color.Black,
Font: labelFont,
}
a.Tick.Label = draw.TextStyle{
Color: color.Black,
Font: tickFont,
}
a.Tick.LineStyle = draw.LineStyle{
Color: color.Black,
Width: vg.Points(0.5),
}
a.Tick.Length = vg.Points(8)
a.Tick.Marker = DefaultTicks{}
return a, nil
}
// than the max number of GlyphDrawers
// in the DefaultGlyphShapes slice.
func Shape(i int) draw.GlyphDrawer {
n := len(DefaultGlyphShapes)
if i < 0 {
return DefaultGlyphShapes[i%n+n]
}
return DefaultGlyphShapes[i%n]
}
// DefaultDashes is a set of dash patterns used by
// the Dashes function.
var DefaultDashes = [][]vg.Length{
{},
{vg.Points(6), vg.Points(2)},
{vg.Points(2), vg.Points(2)},
{vg.Points(1), vg.Points(1)},
{vg.Points(5), vg.Points(2), vg.Points(1), vg.Points(2)},
{vg.Points(10), vg.Points(2), vg.Points(2), vg.Points(2),
vg.Points(2), vg.Points(2), vg.Points(2), vg.Points(2)},
{vg.Points(10), vg.Points(2), vg.Points(2), vg.Points(2)},
{vg.Points(5), vg.Points(2), vg.Points(5), vg.Points(2),
vg.Points(2), vg.Points(2), vg.Points(2), vg.Points(2)},
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")
// }
}
import (
"errors"
"image/color"
"math"
"github.com/skiesel/plot/vg"
"github.com/skiesel/plot/vg/draw"
)
var (
// DefaultLineStyle is the default style for drawing
// lines.
DefaultLineStyle = draw.LineStyle{
Color: color.Black,
Width: vg.Points(1),
Dashes: []vg.Length{},
DashOffs: 0,
}
// DefaultGlyphStyle is the default style used
// for gyph marks.
DefaultGlyphStyle = draw.GlyphStyle{
Color: color.Black,
Radius: vg.Points(2.5),
Shape: draw.RingGlyph{},
}
)
// Valuer wraps the Len and Value methods.
type Valuer interface {
package plotter
import (
"image/color"
"github.com/skiesel/plot"
"github.com/skiesel/plot/vg"
"github.com/skiesel/plot/vg/draw"
)
var (
// DefaultGridLineStyle is the default style for grid lines.
DefaultGridLineStyle = draw.LineStyle{
Color: color.Gray{128},
Width: vg.Points(0.25),
}
)
// Grid implements the plot.Plotter interface, drawing
// a set of grid lines at the major tick marks.
type Grid struct {
// Vertical is the style of the vertical lines.
Vertical draw.LineStyle
// Horizontal is the style of the horizontal lines.
Horizontal draw.LineStyle
}
// NewGrid returns a new grid with both vertical and
// horizontal lines using the default grid line style.
// Copyright ©2015 The gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package plotter
import (
"math"
"github.com/skiesel/plot"
"github.com/skiesel/plot/vg"
"github.com/skiesel/plot/vg/draw"
)
// DefaultCapWidth is the default width of error bar caps.
var DefaultCapWidth = vg.Points(5)
// YErrorBars implements the plot.Plotter, plot.DataRanger,
// and plot.GlyphBoxer interfaces, drawing vertical error
// bars, denoting error in Y values.
type YErrorBars struct {
XYs
// YErrors is a copy of the Y errors for each point.
YErrors
// LineStyle is the style used to draw the error bars.
draw.LineStyle
// CapWidth is the width of the caps drawn at the top
// of each error bar.
func NewGlyphBoxes() *GlyphBoxes {
g := new(GlyphBoxes)
g.Color = color.RGBA{R: 255, A: 255}
g.Width = vg.Points(0.25)
return g
}
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)
}
}
func TestLegendAlignment(t *testing.T) {
font, err := vg.MakeFont(plot.DefaultFont, 10.822510822510822) // This font size gives an entry height of 10.
if err != nil {
t.Fatalf("failed to create font: %v", err)
}
l := plot.Legend{
ThumbnailWidth: vg.Points(20),
TextStyle: draw.TextStyle{Font: font},
}
for _, n := range []string{"A", "B", "C", "D"} {
b, err := plotter.NewBarChart(plotter.Values{0}, 1)
if err != nil {
t.Fatalf("failed to create bar chart %q: %v", n, err)
}
l.Add(n, b)
}
var r recorder.Canvas
c := draw.NewCanvas(&r, 100, 100)
l.Draw(draw.Canvas{
Canvas: c.Canvas,
Rectangle: draw.Rectangle{
Min: draw.Point{0, 0},
Max: draw.Point{100, 100},
},
})
got := r.Actions
// want is a snapshot of the actions for the code above when the
// graphical output has been visually confirmed to be correct for
// the bar charts example show in gonum/plot#25.
want := []recorder.Action{
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.Fill{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 30},
{Type: vg.LineComp, X: 80, Y: 40},
{Type: vg.LineComp, X: 100, Y: 40},
{Type: vg.LineComp, X: 100, Y: 30},
{Type: vg.CloseComp},
},
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.SetLineWidth{
Width: 1,
},
&recorder.SetLineDash{},
&recorder.Stroke{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 30},
{Type: vg.LineComp, X: 80, Y: 40},
{Type: vg.LineComp, X: 100, Y: 40},
{Type: vg.LineComp, X: 100, Y: 30},
{Type: vg.LineComp, X: 80, Y: 30},
},
},
&recorder.SetColor{},
&recorder.FillString{
Font: string("Times-Roman"),
Size: 10.822510822510822,
X: 69.48051948051948,
Y: 30.82251082251082,
String: "A",
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.Fill{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 20},
{Type: vg.LineComp, X: 80, Y: 30},
{Type: vg.LineComp, X: 100, Y: 30},
{Type: vg.LineComp, X: 100, Y: 20},
{Type: vg.CloseComp},
},
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.SetLineWidth{
Width: 1,
},
&recorder.SetLineDash{},
&recorder.Stroke{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 20},
{Type: vg.LineComp, X: 80, Y: 30},
{Type: vg.LineComp, X: 100, Y: 30},
{Type: vg.LineComp, X: 100, Y: 20},
{Type: vg.LineComp, X: 80, Y: 20},
},
},
&recorder.SetColor{},
&recorder.FillString{
Font: string("Times-Roman"),
Size: 10.822510822510822,
X: 70.07575757575758,
Y: 20.82251082251082,
String: "B",
},
&recorder.SetColor{
Color: color.Gray16{
Y: uint16(0),
},
},
&recorder.Fill{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 10},
{Type: vg.LineComp, X: 80, Y: 20},
{Type: vg.LineComp, X: 100, Y: 20},
{Type: vg.LineComp, X: 100, Y: 10},
{Type: vg.CloseComp},
},
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.SetLineWidth{
Width: 1,
},
&recorder.SetLineDash{},
&recorder.Stroke{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 10},
{Type: vg.LineComp, X: 80, Y: 20},
{Type: vg.LineComp, X: 100, Y: 20},
{Type: vg.LineComp, X: 100, Y: 10},
{Type: vg.LineComp, X: 80, Y: 10},
},
},
&recorder.SetColor{},
&recorder.FillString{
Font: string("Times-Roman"),
Size: 10.822510822510822,
X: 70.07575757575758,
Y: 10.822510822510822,
String: "C",
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.Fill{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 0},
{Type: vg.LineComp, X: 80, Y: 10},
{Type: vg.LineComp, X: 100, Y: 10},
{Type: vg.LineComp, X: 100, Y: 0},
{Type: vg.CloseComp},
},
},
&recorder.SetColor{
Color: color.Gray16{},
},
&recorder.SetLineWidth{
Width: 1,
},
&recorder.SetLineDash{},
&recorder.Stroke{
Path: vg.Path{
{Type: vg.MoveComp, X: 80, Y: 0},
{Type: vg.LineComp, X: 80, Y: 10},
{Type: vg.LineComp, X: 100, Y: 10},
{Type: vg.LineComp, X: 100, Y: 0},
{Type: vg.LineComp, X: 80, Y: 0},
},
},
&recorder.SetColor{},
&recorder.FillString{
Font: string("Times-Roman"),
Size: 10.822510822510822,
X: 69.48051948051948,
Y: 0.8225108225108215,
String: "D",
},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("unexpected legend actions:\ngot:\n%s\nwant:\n%s", formatActions(got), formatActions(want))
}
}
package plotter
import (
"errors"
"github.com/skiesel/plot"
"github.com/skiesel/plot/vg"
"github.com/skiesel/plot/vg/draw"
)
var (
// DefaultFont is the default font for label text.
DefaultFont = plot.DefaultFont
// DefaultFontSize is the default font.
DefaultFontSize = vg.Points(10)
)
// Labels implements the Plotter interface,
// drawing a set of labels at specified points.
type Labels struct {
XYs
// Labels is the set of labels corresponding
// to each point.
Labels []string
// TextStyle is the style of the label text.
draw.TextStyle
// XAlign and YAlign are multiplied by the width
// 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)
}
}
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)
}
}
package plotter
import (
"image/color"
"github.com/skiesel/plot"
"github.com/skiesel/plot/vg"
"github.com/skiesel/plot/vg/draw"
)
var (
// DefaultQuartMedianStyle is a fat dot.
DefaultQuartMedianStyle = draw.GlyphStyle{
Color: color.Black,
Radius: vg.Points(1.5),
Shape: draw.CircleGlyph{},
}
// DefaultQuartWhiskerStyle is a hairline.
DefaultQuartWhiskerStyle = draw.LineStyle{
Color: color.Black,
Width: vg.Points(0.5),
Dashes: []vg.Length{},
DashOffs: 0,
}
)
// QuartPlot implements the Plotter interface, drawing
// a plot to represent the distribution of values.
//
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)
}
}