332 lines
7.3 KiB
Go
332 lines
7.3 KiB
Go
// Copyright 2016 Zack Guo <gizak@icloud.com>. All rights reserved.
|
|
// Use of this source code is governed by a MIT license that can
|
|
// be found in the LICENSE file.
|
|
|
|
package termui
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
)
|
|
|
|
// only 16 possible combinations, why bother
|
|
var braillePatterns = map[[2]int]rune{
|
|
[2]int{0, 0}: '⣀',
|
|
[2]int{0, 1}: '⡠',
|
|
[2]int{0, 2}: '⡐',
|
|
[2]int{0, 3}: '⡈',
|
|
|
|
[2]int{1, 0}: '⢄',
|
|
[2]int{1, 1}: '⠤',
|
|
[2]int{1, 2}: '⠔',
|
|
[2]int{1, 3}: '⠌',
|
|
|
|
[2]int{2, 0}: '⢂',
|
|
[2]int{2, 1}: '⠢',
|
|
[2]int{2, 2}: '⠒',
|
|
[2]int{2, 3}: '⠊',
|
|
|
|
[2]int{3, 0}: '⢁',
|
|
[2]int{3, 1}: '⠡',
|
|
[2]int{3, 2}: '⠑',
|
|
[2]int{3, 3}: '⠉',
|
|
}
|
|
|
|
var lSingleBraille = [4]rune{'\u2840', '⠄', '⠂', '⠁'}
|
|
var rSingleBraille = [4]rune{'\u2880', '⠠', '⠐', '⠈'}
|
|
|
|
// LineChart has two modes: braille(default) and dot. Using braille gives 2x capicity as dot mode,
|
|
// because one braille char can represent two data points.
|
|
/*
|
|
lc := termui.NewLineChart()
|
|
lc.BorderLabel = "braille-mode Line Chart"
|
|
lc.Data = [1.2, 1.3, 1.5, 1.7, 1.5, 1.6, 1.8, 2.0]
|
|
lc.Width = 50
|
|
lc.Height = 12
|
|
lc.AxesColor = termui.ColorWhite
|
|
lc.LineColor = termui.ColorGreen | termui.AttrBold
|
|
// termui.Render(lc)...
|
|
*/
|
|
type LineChart struct {
|
|
Block
|
|
Data []float64
|
|
DataLabels []string // if unset, the data indices will be used
|
|
Mode string // braille | dot
|
|
DotStyle rune
|
|
LineColor Attribute
|
|
scale float64 // data span per cell on y-axis
|
|
AxesColor Attribute
|
|
drawingX int
|
|
drawingY int
|
|
axisYHeight int
|
|
axisXWidth int
|
|
axisYLabelGap int
|
|
axisXLabelGap int
|
|
topValue float64
|
|
bottomValue float64
|
|
labelX [][]rune
|
|
labelY [][]rune
|
|
labelYSpace int
|
|
maxY float64
|
|
minY float64
|
|
autoLabels bool
|
|
}
|
|
|
|
// NewLineChart returns a new LineChart with current theme.
|
|
func NewLineChart() *LineChart {
|
|
lc := &LineChart{Block: *NewBlock()}
|
|
lc.AxesColor = ThemeAttr("linechart.axes.fg")
|
|
lc.LineColor = ThemeAttr("linechart.line.fg")
|
|
lc.Mode = "braille"
|
|
lc.DotStyle = '•'
|
|
lc.axisXLabelGap = 2
|
|
lc.axisYLabelGap = 1
|
|
lc.bottomValue = math.Inf(1)
|
|
lc.topValue = math.Inf(-1)
|
|
return lc
|
|
}
|
|
|
|
// one cell contains two data points
|
|
// so the capicity is 2x as dot-mode
|
|
func (lc *LineChart) renderBraille() Buffer {
|
|
buf := NewBuffer()
|
|
|
|
// return: b -> which cell should the point be in
|
|
// m -> in the cell, divided into 4 equal height levels, which subcell?
|
|
getPos := func(d float64) (b, m int) {
|
|
cnt4 := int((d-lc.bottomValue)/(lc.scale/4) + 0.5)
|
|
b = cnt4 / 4
|
|
m = cnt4 % 4
|
|
return
|
|
}
|
|
// plot points
|
|
for i := 0; 2*i+1 < len(lc.Data) && i < lc.axisXWidth; i++ {
|
|
b0, m0 := getPos(lc.Data[2*i])
|
|
b1, m1 := getPos(lc.Data[2*i+1])
|
|
|
|
if b0 == b1 {
|
|
c := Cell{
|
|
Ch: braillePatterns[[2]int{m0, m1}],
|
|
Bg: lc.Bg,
|
|
Fg: lc.LineColor,
|
|
}
|
|
y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b0
|
|
x := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
|
|
buf.Set(x, y, c)
|
|
} else {
|
|
c0 := Cell{Ch: lSingleBraille[m0],
|
|
Fg: lc.LineColor,
|
|
Bg: lc.Bg}
|
|
x0 := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
|
|
y0 := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b0
|
|
buf.Set(x0, y0, c0)
|
|
|
|
c1 := Cell{Ch: rSingleBraille[m1],
|
|
Fg: lc.LineColor,
|
|
Bg: lc.Bg}
|
|
x1 := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
|
|
y1 := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b1
|
|
buf.Set(x1, y1, c1)
|
|
}
|
|
|
|
}
|
|
return buf
|
|
}
|
|
|
|
func (lc *LineChart) renderDot() Buffer {
|
|
buf := NewBuffer()
|
|
for i := 0; i < len(lc.Data) && i < lc.axisXWidth; i++ {
|
|
c := Cell{
|
|
Ch: lc.DotStyle,
|
|
Fg: lc.LineColor,
|
|
Bg: lc.Bg,
|
|
}
|
|
x := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
|
|
y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - int((lc.Data[i]-lc.bottomValue)/lc.scale+0.5)
|
|
buf.Set(x, y, c)
|
|
}
|
|
|
|
return buf
|
|
}
|
|
|
|
func (lc *LineChart) calcLabelX() {
|
|
lc.labelX = [][]rune{}
|
|
|
|
for i, l := 0, 0; i < len(lc.DataLabels) && l < lc.axisXWidth; i++ {
|
|
if lc.Mode == "dot" {
|
|
if l >= len(lc.DataLabels) {
|
|
break
|
|
}
|
|
|
|
s := str2runes(lc.DataLabels[l])
|
|
w := strWidth(lc.DataLabels[l])
|
|
if l+w <= lc.axisXWidth {
|
|
lc.labelX = append(lc.labelX, s)
|
|
}
|
|
l += w + lc.axisXLabelGap
|
|
} else { // braille
|
|
if 2*l >= len(lc.DataLabels) {
|
|
break
|
|
}
|
|
|
|
s := str2runes(lc.DataLabels[2*l])
|
|
w := strWidth(lc.DataLabels[2*l])
|
|
if l+w <= lc.axisXWidth {
|
|
lc.labelX = append(lc.labelX, s)
|
|
}
|
|
l += w + lc.axisXLabelGap
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
func shortenFloatVal(x float64) string {
|
|
s := fmt.Sprintf("%.2f", x)
|
|
if len(s)-3 > 3 {
|
|
s = fmt.Sprintf("%.2e", x)
|
|
}
|
|
|
|
if x < 0 {
|
|
s = fmt.Sprintf("%.2f", x)
|
|
}
|
|
return s
|
|
}
|
|
|
|
func (lc *LineChart) calcLabelY() {
|
|
span := lc.topValue - lc.bottomValue
|
|
lc.scale = span / float64(lc.axisYHeight)
|
|
|
|
n := (1 + lc.axisYHeight) / (lc.axisYLabelGap + 1)
|
|
lc.labelY = make([][]rune, n)
|
|
maxLen := 0
|
|
for i := 0; i < n; i++ {
|
|
s := str2runes(shortenFloatVal(lc.bottomValue + float64(i)*span/float64(n)))
|
|
if len(s) > maxLen {
|
|
maxLen = len(s)
|
|
}
|
|
lc.labelY[i] = s
|
|
}
|
|
|
|
lc.labelYSpace = maxLen
|
|
}
|
|
|
|
func (lc *LineChart) calcLayout() {
|
|
// set datalabels if it is not provided
|
|
if (lc.DataLabels == nil || len(lc.DataLabels) == 0) || lc.autoLabels {
|
|
lc.autoLabels = true
|
|
lc.DataLabels = make([]string, len(lc.Data))
|
|
for i := range lc.Data {
|
|
lc.DataLabels[i] = fmt.Sprint(i)
|
|
}
|
|
}
|
|
|
|
// lazy increase, to avoid y shaking frequently
|
|
// update bound Y when drawing is gonna overflow
|
|
lc.minY = lc.Data[0]
|
|
lc.maxY = lc.Data[0]
|
|
|
|
// valid visible range
|
|
vrange := lc.innerArea.Dx()
|
|
if lc.Mode == "braille" {
|
|
vrange = 2 * lc.innerArea.Dx()
|
|
}
|
|
if vrange > len(lc.Data) {
|
|
vrange = len(lc.Data)
|
|
}
|
|
|
|
for _, v := range lc.Data[:vrange] {
|
|
if v > lc.maxY {
|
|
lc.maxY = v
|
|
}
|
|
if v < lc.minY {
|
|
lc.minY = v
|
|
}
|
|
}
|
|
|
|
span := lc.maxY - lc.minY
|
|
|
|
if lc.minY < lc.bottomValue {
|
|
lc.bottomValue = lc.minY - 0.2*span
|
|
}
|
|
|
|
if lc.maxY > lc.topValue {
|
|
lc.topValue = lc.maxY + 0.2*span
|
|
}
|
|
|
|
lc.axisYHeight = lc.innerArea.Dy() - 2
|
|
lc.calcLabelY()
|
|
|
|
lc.axisXWidth = lc.innerArea.Dx() - 1 - lc.labelYSpace
|
|
lc.calcLabelX()
|
|
|
|
lc.drawingX = lc.innerArea.Min.X + 1 + lc.labelYSpace
|
|
lc.drawingY = lc.innerArea.Min.Y
|
|
}
|
|
|
|
func (lc *LineChart) plotAxes() Buffer {
|
|
buf := NewBuffer()
|
|
|
|
origY := lc.innerArea.Min.Y + lc.innerArea.Dy() - 2
|
|
origX := lc.innerArea.Min.X + lc.labelYSpace
|
|
|
|
buf.Set(origX, origY, Cell{Ch: ORIGIN, Fg: lc.AxesColor, Bg: lc.Bg})
|
|
|
|
for x := origX + 1; x < origX+lc.axisXWidth; x++ {
|
|
buf.Set(x, origY, Cell{Ch: HDASH, Fg: lc.AxesColor, Bg: lc.Bg})
|
|
}
|
|
|
|
for dy := 1; dy <= lc.axisYHeight; dy++ {
|
|
buf.Set(origX, origY-dy, Cell{Ch: VDASH, Fg: lc.AxesColor, Bg: lc.Bg})
|
|
}
|
|
|
|
// x label
|
|
oft := 0
|
|
for _, rs := range lc.labelX {
|
|
if oft+len(rs) > lc.axisXWidth {
|
|
break
|
|
}
|
|
for j, r := range rs {
|
|
c := Cell{
|
|
Ch: r,
|
|
Fg: lc.AxesColor,
|
|
Bg: lc.Bg,
|
|
}
|
|
x := origX + oft + j
|
|
y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 1
|
|
buf.Set(x, y, c)
|
|
}
|
|
oft += len(rs) + lc.axisXLabelGap
|
|
}
|
|
|
|
// y labels
|
|
for i, rs := range lc.labelY {
|
|
for j, r := range rs {
|
|
buf.Set(
|
|
lc.innerArea.Min.X+j,
|
|
origY-i*(lc.axisYLabelGap+1),
|
|
Cell{Ch: r, Fg: lc.AxesColor, Bg: lc.Bg})
|
|
}
|
|
}
|
|
|
|
return buf
|
|
}
|
|
|
|
// Buffer implements Bufferer interface.
|
|
func (lc *LineChart) Buffer() Buffer {
|
|
buf := lc.Block.Buffer()
|
|
|
|
if lc.Data == nil || len(lc.Data) == 0 {
|
|
return buf
|
|
}
|
|
lc.calcLayout()
|
|
buf.Merge(lc.plotAxes())
|
|
|
|
if lc.Mode == "dot" {
|
|
buf.Merge(lc.renderDot())
|
|
} else {
|
|
buf.Merge(lc.renderBraille())
|
|
}
|
|
|
|
return buf
|
|
}
|