/
main.go
285 lines (265 loc) · 6.34 KB
/
main.go
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// pie chart
// read data from files with this format:
// one line per item, fields (name, value, color; tab-separated)
// lines beginning with '#' are the title
// for example:
//
// # Desktop Browser Market Share 2021-09
// Chrome 67.17 red
// Edge 9.33 green
// Firefox 7.87 orange
// Safari 9.63 blue
// Other 5.99 gray
package main
import (
"bufio"
"flag"
"fmt"
"image/color"
"io"
"os"
"strconv"
"strings"
"gioui.org/app"
"gioui.org/io/event"
"gioui.org/io/input"
"gioui.org/io/key"
"gioui.org/io/pointer"
"gioui.org/op"
"gioui.org/unit"
"github.com/ajstarks/giocanvas"
)
const fullcircle = 3.14159265358979323846264338327950288419716939937510582097494459 * 2
type piedata struct {
name string
value float64
color string
}
func datasum(data []piedata) float64 {
sum := 0.0
for _, d := range data {
sum += d.value
}
return sum
}
// readpie reads tab separated values
func readpie(filename string) ([]piedata, string, error) {
var d piedata
var data []piedata
var err error
var title string
r, err := os.Open(filename)
if err != nil {
return data, "", err
}
scanner := bufio.NewScanner(r)
for scanner.Scan() {
t := scanner.Text()
if len(t) == 0 { // skip blank lines
continue
}
if t[0] == '#' && len(t) > 2 { // process titles
title = strings.TrimSpace(t[1:])
continue
}
fields := strings.Split(t, "\t")
if len(fields) < 3 {
continue
}
d.name = fields[0]
d.color = fields[2]
d.value, err = strconv.ParseFloat(fields[1], 64)
if err != nil {
d.value = 0
}
data = append(data, d)
}
r.Close()
err = scanner.Err()
return data, title, err
}
// piechart draws the piechart
func piechart(canvas *giocanvas.Canvas, x, y, r float32, data []piedata) {
sum := datasum(data)
a1 := 0.0
labelr := r + 10
ts := r / 10
for _, d := range data {
color := giocanvas.ColorLookup(d.color)
p := (d.value / sum)
angle := p * fullcircle
a2 := a1 + angle
mid := fullcircle - (a1 + (a2-a1)/2)
canvas.Arc(x, y, r, a1, a2, color)
tx, ty := canvas.Polar(x, y, labelr, float32(mid))
lx, ly := canvas.Polar(x, y, labelr-ts, float32(mid))
canvas.CText(tx, ty, ts, fmt.Sprintf("%s (%.2f%%)", d.name, p*100), color)
canvas.Line(x, y, lx, ly, 0.1, color)
a1 = a2
}
}
var pressed bool
var pieNumber int
func kbpointer(q input.Source, context *op.Ops, ns int) {
nev := 0
for {
e, ok := q.Event(
key.Filter{Optional: key.ModCtrl},
pointer.Filter{Target: &pressed, Kinds: pointer.Press | pointer.Move | pointer.Release | pointer.Scroll},
)
if !ok {
break
}
switch e := e.(type) {
case key.Event:
switch e.State {
case key.Press:
switch e.Name {
// emacs bindings
case "A", "1": // first slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber = 0
}
case "E": // last slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber = ns
}
case "B": // back a slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber--
}
case "F": // forward a slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber++
}
case "P": // previous slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber--
}
case "N": // next slide
if e.Modifiers == 0 || e.Modifiers == key.ModCtrl {
pieNumber++
}
case "^", "⇱": // first slide
pieNumber = 0
case "$", "⇲": // last slide
pieNumber = ns
case key.NameSpace, "⏎":
if e.Modifiers == 0 {
pieNumber++
} else {
pieNumber--
}
case key.NameRightArrow, key.NamePageDown, key.NameDownArrow, "K":
pieNumber++
case key.NameLeftArrow, key.NamePageUp, key.NameUpArrow, "J":
pieNumber--
case key.NameEscape, "Q":
os.Exit(0)
}
}
case pointer.Event:
switch e.Kind {
case pointer.Scroll:
nev++
if e.Scroll.Y > 0 && nev == 2 {
pieNumber--
}
if e.Scroll.Y == 0 && nev == 2 {
pieNumber++
}
case pointer.Press:
switch e.Buttons {
case pointer.ButtonPrimary:
pieNumber++
case pointer.ButtonSecondary:
pieNumber--
case pointer.ButtonTertiary:
pieNumber = 0
}
}
}
}
event.Op(context, &pressed)
}
// pie is the app
func pie(w *app.Window, files []string) error {
var err error
var data [][]piedata
var title []string
var nfiles int
if len(files) == 0 { // if no files are specified, load default data
data = make([][]piedata, 1)
title = make([]string, 1)
title[0] = "Browser Market Share, 2021-09"
data[0] = []piedata{
{name: "Chrome", value: 67.17, color: "#2171b5"},
{name: "Edge", value: 9.33, color: "#4292c6"},
{name: "Firefox", value: 7.87, color: "#6baed6"},
{name: "Safari", value: 9.63, color: "#9ecae1"},
{name: "Other", value: 5.99, color: "#c6dbef"},
}
} else { // if you have files, read and load data, skipping bad files
data = make([][]piedata, len(files))
title = make([]string, len(files))
nfiles = 0
for i := 0; i < len(files); i++ {
d, t, ferr := readpie(files[i])
if ferr != nil {
fmt.Fprintf(os.Stderr, "%v\n", ferr)
continue
}
data[nfiles] = d
title[nfiles] = t
nfiles++
}
}
nf := nfiles - 1
pieNumber = 0
var (
piesize float32 = 25
top float32 = 95
bottom float32 = 100 - top
)
for {
e := w.Event()
switch e := e.(type) {
case app.DestroyEvent:
return err
case app.FrameEvent:
w, h := float32(e.Size.X), float32(e.Size.Y)
canvas := giocanvas.NewCanvas(w, h, app.FrameEvent{})
if pieNumber >= nf {
pieNumber = 0
}
if pieNumber < 0 {
pieNumber = nf
}
canvas.Background(color.NRGBA{0, 0, 0, 255})
canvas.CText(50, top, 4, title[pieNumber], color.NRGBA{240, 240, 240, 255})
canvas.CText(50, bottom, 2, "Source: StatCounter", color.NRGBA{150, 150, 150, 255})
piechart(canvas, 50, 50, piesize, data[pieNumber])
kbpointer(e.Source, canvas.Context.Ops, nfiles)
e.Frame(canvas.Context.Ops)
}
}
return err
}
func main() {
var cw, ch int
flag.IntVar(&cw, "width", 1000, "canvas width")
flag.IntVar(&ch, "height", 1000, "canvas height")
flag.Parse()
width := float32(cw)
height := float32(ch)
go func() {
w := &app.Window{}
w.Option(app.Title("pie"), app.Size(unit.Dp(width), unit.Dp(height)))
if err := pie(w, flag.Args()); err != nil {
io.WriteString(os.Stderr, "Cannot create the window\n")
os.Exit(1)
}
os.Exit(0)
}()
app.Main()
}