332 lines
7.3 KiB
Go
332 lines
7.3 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
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// Use of this source code is governed by a MIT license that can
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// be found in the LICENSE file.
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package termui
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import (
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"fmt"
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"math"
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)
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// only 16 possible combinations, why bother
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var braillePatterns = map[[2]int]rune{
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[2]int{0, 0}: '⣀',
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[2]int{0, 1}: '⡠',
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[2]int{0, 2}: '⡐',
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[2]int{0, 3}: '⡈',
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[2]int{1, 0}: '⢄',
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[2]int{1, 1}: '⠤',
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[2]int{1, 2}: '⠔',
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[2]int{1, 3}: '⠌',
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[2]int{2, 0}: '⢂',
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[2]int{2, 1}: '⠢',
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[2]int{2, 2}: '⠒',
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[2]int{2, 3}: '⠊',
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[2]int{3, 0}: '⢁',
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[2]int{3, 1}: '⠡',
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[2]int{3, 2}: '⠑',
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[2]int{3, 3}: '⠉',
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}
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var lSingleBraille = [4]rune{'\u2840', '⠄', '⠂', '⠁'}
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var rSingleBraille = [4]rune{'\u2880', '⠠', '⠐', '⠈'}
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// LineChart has two modes: braille(default) and dot. Using braille gives 2x capicity as dot mode,
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// because one braille char can represent two data points.
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/*
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lc := termui.NewLineChart()
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lc.BorderLabel = "braille-mode Line Chart"
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lc.Data = [1.2, 1.3, 1.5, 1.7, 1.5, 1.6, 1.8, 2.0]
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lc.Width = 50
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lc.Height = 12
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lc.AxesColor = termui.ColorWhite
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lc.LineColor = termui.ColorGreen | termui.AttrBold
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// termui.Render(lc)...
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*/
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type LineChart struct {
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Block
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Data []float64
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DataLabels []string // if unset, the data indices will be used
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Mode string // braille | dot
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DotStyle rune
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LineColor Attribute
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scale float64 // data span per cell on y-axis
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AxesColor Attribute
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drawingX int
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drawingY int
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axisYHeight int
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axisXWidth int
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axisYLabelGap int
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axisXLabelGap int
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topValue float64
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bottomValue float64
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labelX [][]rune
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labelY [][]rune
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labelYSpace int
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maxY float64
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minY float64
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autoLabels bool
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}
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// NewLineChart returns a new LineChart with current theme.
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func NewLineChart() *LineChart {
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lc := &LineChart{Block: *NewBlock()}
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lc.AxesColor = ThemeAttr("linechart.axes.fg")
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lc.LineColor = ThemeAttr("linechart.line.fg")
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lc.Mode = "braille"
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lc.DotStyle = '•'
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lc.axisXLabelGap = 2
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lc.axisYLabelGap = 1
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lc.bottomValue = math.Inf(1)
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lc.topValue = math.Inf(-1)
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return lc
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}
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// one cell contains two data points
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// so the capicity is 2x as dot-mode
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func (lc *LineChart) renderBraille() Buffer {
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buf := NewBuffer()
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// return: b -> which cell should the point be in
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// m -> in the cell, divided into 4 equal height levels, which subcell?
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getPos := func(d float64) (b, m int) {
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cnt4 := int((d-lc.bottomValue)/(lc.scale/4) + 0.5)
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b = cnt4 / 4
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m = cnt4 % 4
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return
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}
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// plot points
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for i := 0; 2*i+1 < len(lc.Data) && i < lc.axisXWidth; i++ {
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b0, m0 := getPos(lc.Data[2*i])
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b1, m1 := getPos(lc.Data[2*i+1])
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if b0 == b1 {
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c := Cell{
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Ch: braillePatterns[[2]int{m0, m1}],
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Bg: lc.Bg,
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Fg: lc.LineColor,
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}
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y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b0
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x := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
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buf.Set(x, y, c)
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} else {
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c0 := Cell{Ch: lSingleBraille[m0],
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Fg: lc.LineColor,
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Bg: lc.Bg}
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x0 := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
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y0 := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b0
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buf.Set(x0, y0, c0)
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c1 := Cell{Ch: rSingleBraille[m1],
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Fg: lc.LineColor,
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Bg: lc.Bg}
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x1 := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
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y1 := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - b1
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buf.Set(x1, y1, c1)
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}
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}
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return buf
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}
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func (lc *LineChart) renderDot() Buffer {
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buf := NewBuffer()
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for i := 0; i < len(lc.Data) && i < lc.axisXWidth; i++ {
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c := Cell{
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Ch: lc.DotStyle,
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Fg: lc.LineColor,
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Bg: lc.Bg,
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}
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x := lc.innerArea.Min.X + lc.labelYSpace + 1 + i
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y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 3 - int((lc.Data[i]-lc.bottomValue)/lc.scale+0.5)
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buf.Set(x, y, c)
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}
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return buf
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}
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func (lc *LineChart) calcLabelX() {
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lc.labelX = [][]rune{}
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for i, l := 0, 0; i < len(lc.DataLabels) && l < lc.axisXWidth; i++ {
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if lc.Mode == "dot" {
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if l >= len(lc.DataLabels) {
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break
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}
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s := str2runes(lc.DataLabels[l])
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w := strWidth(lc.DataLabels[l])
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if l+w <= lc.axisXWidth {
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lc.labelX = append(lc.labelX, s)
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}
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l += w + lc.axisXLabelGap
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} else { // braille
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if 2*l >= len(lc.DataLabels) {
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break
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}
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s := str2runes(lc.DataLabels[2*l])
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w := strWidth(lc.DataLabels[2*l])
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if l+w <= lc.axisXWidth {
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lc.labelX = append(lc.labelX, s)
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}
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l += w + lc.axisXLabelGap
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}
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}
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}
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func shortenFloatVal(x float64) string {
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s := fmt.Sprintf("%.2f", x)
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if len(s)-3 > 3 {
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s = fmt.Sprintf("%.2e", x)
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}
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if x < 0 {
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s = fmt.Sprintf("%.2f", x)
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}
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return s
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}
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func (lc *LineChart) calcLabelY() {
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span := lc.topValue - lc.bottomValue
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lc.scale = span / float64(lc.axisYHeight)
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n := (1 + lc.axisYHeight) / (lc.axisYLabelGap + 1)
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lc.labelY = make([][]rune, n)
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maxLen := 0
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for i := 0; i < n; i++ {
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s := str2runes(shortenFloatVal(lc.bottomValue + float64(i)*span/float64(n)))
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if len(s) > maxLen {
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maxLen = len(s)
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}
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lc.labelY[i] = s
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}
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lc.labelYSpace = maxLen
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}
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func (lc *LineChart) calcLayout() {
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// set datalabels if it is not provided
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if (lc.DataLabels == nil || len(lc.DataLabels) == 0) || lc.autoLabels {
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lc.autoLabels = true
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lc.DataLabels = make([]string, len(lc.Data))
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for i := range lc.Data {
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lc.DataLabels[i] = fmt.Sprint(i)
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}
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}
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// lazy increase, to avoid y shaking frequently
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// update bound Y when drawing is gonna overflow
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lc.minY = lc.Data[0]
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lc.maxY = lc.Data[0]
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// valid visible range
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vrange := lc.innerArea.Dx()
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if lc.Mode == "braille" {
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vrange = 2 * lc.innerArea.Dx()
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}
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if vrange > len(lc.Data) {
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vrange = len(lc.Data)
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}
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for _, v := range lc.Data[:vrange] {
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if v > lc.maxY {
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lc.maxY = v
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}
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if v < lc.minY {
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lc.minY = v
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}
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}
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span := lc.maxY - lc.minY
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if lc.minY < lc.bottomValue {
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lc.bottomValue = lc.minY - 0.2*span
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}
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if lc.maxY > lc.topValue {
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lc.topValue = lc.maxY + 0.2*span
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}
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lc.axisYHeight = lc.innerArea.Dy() - 2
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lc.calcLabelY()
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lc.axisXWidth = lc.innerArea.Dx() - 1 - lc.labelYSpace
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lc.calcLabelX()
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lc.drawingX = lc.innerArea.Min.X + 1 + lc.labelYSpace
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lc.drawingY = lc.innerArea.Min.Y
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}
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func (lc *LineChart) plotAxes() Buffer {
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buf := NewBuffer()
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origY := lc.innerArea.Min.Y + lc.innerArea.Dy() - 2
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origX := lc.innerArea.Min.X + lc.labelYSpace
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buf.Set(origX, origY, Cell{Ch: ORIGIN, Fg: lc.AxesColor, Bg: lc.Bg})
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for x := origX + 1; x < origX+lc.axisXWidth; x++ {
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buf.Set(x, origY, Cell{Ch: HDASH, Fg: lc.AxesColor, Bg: lc.Bg})
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}
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for dy := 1; dy <= lc.axisYHeight; dy++ {
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buf.Set(origX, origY-dy, Cell{Ch: VDASH, Fg: lc.AxesColor, Bg: lc.Bg})
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}
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// x label
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oft := 0
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for _, rs := range lc.labelX {
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if oft+len(rs) > lc.axisXWidth {
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break
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}
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for j, r := range rs {
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c := Cell{
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Ch: r,
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Fg: lc.AxesColor,
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Bg: lc.Bg,
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}
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x := origX + oft + j
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y := lc.innerArea.Min.Y + lc.innerArea.Dy() - 1
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buf.Set(x, y, c)
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}
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oft += len(rs) + lc.axisXLabelGap
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}
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// y labels
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for i, rs := range lc.labelY {
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for j, r := range rs {
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buf.Set(
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lc.innerArea.Min.X+j,
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origY-i*(lc.axisYLabelGap+1),
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Cell{Ch: r, Fg: lc.AxesColor, Bg: lc.Bg})
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}
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}
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return buf
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}
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// Buffer implements Bufferer interface.
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func (lc *LineChart) Buffer() Buffer {
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buf := lc.Block.Buffer()
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if lc.Data == nil || len(lc.Data) == 0 {
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return buf
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}
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lc.calcLayout()
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buf.Merge(lc.plotAxes())
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if lc.Mode == "dot" {
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buf.Merge(lc.renderDot())
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} else {
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buf.Merge(lc.renderBraille())
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}
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return buf
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}
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