Piechart
This commit is contained in:
Bernd Louis
Bernd Louis
parent
19bab32e9c
commit
657b77a1ed
62
_example/piechart.go
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62
_example/piechart.go
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@ -0,0 +1,62 @@
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// +build ignore
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package main
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import (
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"fmt"
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"github.com/gizak/termui"
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"math"
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"math/rand"
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"time"
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)
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func main() {
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if err := termui.Init(); err != nil {
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panic(err)
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}
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defer termui.Close()
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rand.Seed(time.Now().UTC().UnixNano())
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randomDataAndOffset := func() (data []float64, offset float64) {
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noSlices := 1 + rand.Intn(5)
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data = make([]float64, noSlices)
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for i := range data {
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data[i] = rand.Float64()
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}
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offset = 2.0 * math.Pi * rand.Float64()
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return
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}
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run := true
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pc := termui.NewPieChart()
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pc.BorderLabel = "Pie Chart"
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pc.Width = 70
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pc.Height = 36
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pc.Data = []float64{.25, .25, .25, .25}
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pc.Offset = -.5 * math.Pi
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pc.Label = func(i int, v float64) string {
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return fmt.Sprintf("%.02f", v)
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}
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termui.Handle("/timer/1s", func(e termui.Event) {
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if run {
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pc.Data, pc.Offset = randomDataAndOffset()
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termui.Render(pc)
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}
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})
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termui.Handle("/sys/kbd/s", func(termui.Event) {
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run = !run
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if run {
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pc.BorderLabel = "Pie Chart"
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} else {
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pc.BorderLabel = "Pie Chart (Stopped)"
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}
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termui.Render(pc)
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})
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termui.Handle("/sys/kbd/q", func(termui.Event) {
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termui.StopLoop()
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})
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termui.Render(pc)
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termui.Loop()
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}
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292
piechart.go
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292
piechart.go
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@ -0,0 +1,292 @@
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package termui
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import (
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"container/list"
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"image"
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"math"
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)
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const (
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piechartOffsetUp = -.5 * math.Pi // the northward angle
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sectorFactor = 7.0 // circle resolution: precision vs. performance
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fullCircle = 2.0 * math.Pi // the full circle angle
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xStretch = 2.0 // horizontal adjustment
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solidBlock = '░'
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)
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var (
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defaultColors = []Attribute{
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ColorRed,
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ColorGreen,
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ColorYellow,
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ColorBlue,
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ColorMagenta,
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ColorCyan,
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ColorWhite,
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}
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)
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// PieChartLabel callback, i is the current data index, v the current value
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type PieChartLabel func(i int, v float64) string
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type PieChart struct {
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Block
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Data []float64 // list of data items
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Colors []Attribute // colors to by cycled through (see defaultColors)
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BorderColor Attribute // color of the pie-border
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Label PieChartLabel // callback function for labels
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Offset float64 // where to start drawing? (see piechartOffsetUp)
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}
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// Creates a new pie chart with reasonable defaults and no labels
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func NewPieChart() *PieChart {
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pc := &PieChart{Block: *NewBlock()}
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pc.Colors = defaultColors
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pc.Offset = piechartOffsetUp
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pc.BorderColor = ColorDefault
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return pc
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}
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// computes the color for a given data index
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func (pc *PieChart) colorFor(i int) Attribute {
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return pc.Colors[i%len(pc.Colors)]
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}
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// creates the buffer for the pie chart
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func (pc *PieChart) Buffer() Buffer {
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buf := pc.Block.Buffer()
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w, h := pc.innerArea.Dx(), pc.innerArea.Dy()
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center := image.Point{X: w / 2, Y: h / 2}
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// radius for the border
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r := 0.0
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if h < w/xStretch {
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r = float64(h/2) - 1.0
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} else {
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r = float64(w/2/xStretch) - 1.0
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}
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// make border
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borderCircle := &circle{Point: center, radius: r}
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drawBorder := func() {
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borderCircle.draw(&buf, Cell{Ch: solidBlock, Fg: pc.BorderColor, Bg: ColorDefault})
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}
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drawBorder()
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if len(pc.Data) == 0 { // nothing to draw?
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return buf
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}
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// compute slice sizes
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sum := sum(pc.Data)
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sliceSizes := make([]float64, len(pc.Data))
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for i, v := range pc.Data {
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sliceSizes[i] = v / sum * fullCircle
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}
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// draw slice borders
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phi := pc.Offset
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for i, v := range sliceSizes {
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p := borderCircle.at(phi)
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l := line{P1: center, P2: p}
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l.draw(&buf, &Cell{Ch: solidBlock, Fg: pc.colorFor(i), Bg: ColorDefault})
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phi += v
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}
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// fill slices
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middleCircle := circle{Point: center, radius: r / 2.0}
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_, sectorSize := borderCircle.sectors()
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phi = pc.Offset
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for i, v := range sliceSizes {
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if v > sectorSize { // do not render if slice is too small
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cell := Cell{Ch: solidBlock, Fg: pc.colorFor(i), Bg: ColorDefault}
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halfSlice := phi + v/2.0
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fill(borderCircle.inner(halfSlice), &cell, &buf)
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fill(middleCircle.at(halfSlice), &cell, &buf)
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for f := phi; f < phi+v; f += sectorSize {
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line{P1: center, P2: borderCircle.inner(f)}.draw(&buf, &cell)
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}
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}
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phi += v
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}
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// labels
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if pc.Label != nil {
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drawLabel := func(p image.Point, label string, fg, bg Attribute) {
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offset := p.Add(image.Point{X: -int(round(float64(len(label)) / 2.0)), Y: 0})
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for i, v := range []rune(label) {
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buf.Set(offset.X+i, offset.Y, Cell{Ch: v, Fg: fg, Bg: bg})
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}
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}
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phi = pc.Offset
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for i, v := range sliceSizes {
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labelAt := middleCircle.at(phi + v/2.0)
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if len(pc.Data) == 1 {
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labelAt = center
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}
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drawLabel(labelAt, pc.Label(i, pc.Data[i]), pc.colorFor(i), ColorDefault)
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phi += v
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}
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}
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drawBorder()
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return buf
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}
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// fills empty cells from position
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func fill(p image.Point, c *Cell, buf *Buffer) {
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empty := func(x, y int) bool {
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return buf.At(x, y).Ch == ' '
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}
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if !empty(p.X, p.Y) {
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return
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}
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q := list.New()
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q.PushBack(p)
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buf.Set(p.X, p.Y, *c)
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for q.Front() != nil {
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p := q.Remove(q.Front()).(image.Point)
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w, e, row := p.X, p.X, p.Y
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for empty(w-1, row) {
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w -= 1
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}
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for empty(e+1, row) {
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e += 1
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}
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for x := w; x <= e; x++ {
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buf.Set(x, row, *c)
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if empty(x, row-1) {
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q.PushBack(image.Point{X: x, Y: row - 1})
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}
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if empty(x, row+1) {
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q.PushBack(image.Point{X: x, Y: row + 1})
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}
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}
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}
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}
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type circle struct {
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image.Point
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radius float64
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}
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// computes the point at a given angle phi
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func (c circle) at(phi float64) image.Point {
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x := c.X + int(round(xStretch*c.radius*math.Cos(phi)))
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y := c.Y + int(round(c.radius*math.Sin(phi)))
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return image.Point{X: x, Y: y}
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}
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// computes the "inner" point at a given angle phi
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func (c circle) inner(phi float64) image.Point {
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p := image.Point{X: 0, Y: 0}
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outer := c.at(phi)
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if c.X < outer.X {
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p.X = -1
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} else if c.X > outer.X {
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p.X = 1
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}
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if c.Y < outer.Y {
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p.Y = -1
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} else if c.Y > outer.Y {
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p.Y = 1
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}
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return outer.Add(p)
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}
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// computes the perimeter of a circle
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func (c circle) perimeter() float64 {
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return 2.0 * math.Pi * c.radius
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}
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// computes the number of sectors and the size of each sector
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func (c circle) sectors() (sectors float64, sectorSize float64) {
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sectors = c.perimeter() * sectorFactor
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sectorSize = fullCircle / sectors
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return
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}
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// draws the circle
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func (c circle) draw(buf *Buffer, cell Cell) {
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sectors, sectorSize := c.sectors()
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for i := 0; i < int(round(sectors)); i++ {
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phi := float64(i) * sectorSize
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point := c.at(float64(phi))
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buf.Set(point.X, point.Y, cell)
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}
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}
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// a line between two points
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type line struct {
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P1, P2 image.Point
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}
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// draws the line
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func (l line) draw(buf *Buffer, cell *Cell) {
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isLeftOf := func(p1, p2 image.Point) bool {
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return p1.X <= p2.X
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}
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isTopOf := func(p1, p2 image.Point) bool {
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return p1.Y <= p2.Y
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}
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p1, p2 := l.P1, l.P2
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buf.Set(l.P2.X, l.P2.Y, Cell{Ch: '*', Fg: cell.Fg, Bg: cell.Bg})
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width, height := l.size()
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if width > height { // paint left to right
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if !isLeftOf(p1, p2) {
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p1, p2 = p2, p1
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}
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flip := 1.0
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if !isTopOf(p1, p2) {
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flip = -1.0
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}
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for x := p1.X; x <= p2.X; x++ {
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ratio := float64(height) / float64(width)
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factor := float64(x - p1.X)
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y := ratio * factor * flip
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buf.Set(x, int(round(y))+p1.Y, *cell)
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}
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} else { // paint top to bottom
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if !isTopOf(p1, p2) {
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p1, p2 = p2, p1
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}
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flip := 1.0
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if !isLeftOf(p1, p2) {
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flip = -1.0
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}
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for y := p1.Y; y <= p2.Y; y++ {
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ratio := float64(width) / float64(height)
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factor := float64(y - p1.Y)
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x := ratio * factor * flip
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buf.Set(int(round(x))+p1.X, y, *cell)
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}
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}
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}
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// width and height of a line
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func (l line) size() (w, h int) {
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return abs(l.P2.X - l.P1.X), abs(l.P2.Y - l.P1.Y)
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}
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// rounds a value
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func round(x float64) float64 {
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return math.Floor(x + 0.5)
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}
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// fold a sum
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func sum(data []float64) float64 {
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sum := 0.0
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for _, v := range data {
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sum += v
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}
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return sum
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}
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// math.Abs for ints
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func abs(x int) int {
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if x >= 0 {
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return x
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} else {
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return -x
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}
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}
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