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package termui
import (
"image"
"sort"
. "github.com/gizak/termui/v3"
drawille "github.com/xxxserxxx/gotop/v4/termui/drawille-go"
)
// LineGraph draws a graph like this ⣀⡠⠤⠔⣁ of data points.
type LineGraph struct {
*Block
// Data is a size-managed data set for the graph. Each entry is a line;
// each sub-array are points in the line. The maximum size of the
// sub-arrays is controlled by the size of the canvas. This
// array is **not** thread-safe. Do not modify this array, or it's
// sub-arrays in threads different than the thread that calls `Draw()`
Data map[string][]float64
// The labels drawn on the graph for each of the lines; the key is shared
// by Data; the value is the text that will be rendered.
Labels map[string]string
HorizontalScale int
LineColors map[string]Color
LabelStyles map[string]Modifier
DefaultLineColor Color
}
func NewLineGraph() *LineGraph {
return &LineGraph{
Block: NewBlock(),
Data: make(map[string][]float64),
Labels: make(map[string]string),
HorizontalScale: 5,
LineColors: make(map[string]Color),
LabelStyles: make(map[string]Modifier),
}
}
func (self *LineGraph) Draw(buf *Buffer) {
self.Block.Draw(buf)
// we render each data point on to the canvas then copy over the braille to the buffer at the end
// fyi braille characters have 2x4 dots for each character
c := drawille.NewCanvas()
// used to keep track of the braille colors until the end when we render the braille to the buffer
colors := make([][]Color, self.Inner.Dx()+2)
for i := range colors {
colors[i] = make([]Color, self.Inner.Dy()+2)
}
// sort the series so that overlapping data will overlap the same way each time
seriesList := make([]string, len(self.Data))
i := 0
for seriesName := range self.Data {
seriesList[i] = seriesName
i++
}
sort.Strings(seriesList)
// draw lines in reverse order so that the first color defined in the colorscheme is on top
for i := len(seriesList) - 1; i >= 0; i-- {
seriesName := seriesList[i]
seriesData := self.Data[seriesName]
seriesLineColor, ok := self.LineColors[seriesName]
if !ok {
seriesLineColor = self.DefaultLineColor
self.LineColors[seriesName] = seriesLineColor
}
// coordinates of last point
lastY, lastX := -1, -1
// assign colors to `colors` and lines/points to the canvas
dx := self.Inner.Dx()
for i := len(seriesData) - 1; i >= 0; i-- {
x := ((dx + 1) * 2) - 1 - (((len(seriesData) - 1) - i) * self.HorizontalScale)
y := ((self.Inner.Dy() + 1) * 4) - 1 - int((float64((self.Inner.Dy())*4)-1)*(seriesData[i]/100))
if x < 0 {
// render the line to the last point up to the wall
if x > -self.HorizontalScale {
for _, p := range drawille.Line(lastX, lastY, x, y) {
if p.X > 0 {
c.Set(p.X, p.Y)
colors[p.X/2][p.Y/4] = seriesLineColor
}
}
}
if len(seriesData) > 4*dx {
self.Data[seriesName] = seriesData[dx-1:]
}
break
}
if lastY == -1 { // if this is the first point
c.Set(x, y)
colors[x/2][y/4] = seriesLineColor
} else {
c.DrawLine(lastX, lastY, x, y)
for _, p := range drawille.Line(lastX, lastY, x, y) {
colors[p.X/2][p.Y/4] = seriesLineColor
}
}
lastX, lastY = x, y
}
// copy braille and colors to buffer
for y, line := range c.Rows(c.MinX(), c.MinY(), c.MaxX(), c.MaxY()) {
for x, char := range line {
x /= 3 // idk why but it works
if x == 0 {
continue
}
if char != 10240 { // empty braille character
buf.SetCell(
NewCell(char, NewStyle(colors[x][y])),
image.Pt(self.Inner.Min.X+x-1, self.Inner.Min.Y+y-1),
)
}
}
}
}
// renders key/label ontop
maxWid := 0
xoff := 0 // X offset for additional columns of text
yoff := 0 // Y offset for resetting column to top of widget
for i, seriesName := range seriesList {
if yoff+i+2 > self.Inner.Dy() {
xoff += maxWid + 2
yoff = -i
maxWid = 0
}
seriesLineColor, ok := self.LineColors[seriesName]
if !ok {
seriesLineColor = self.DefaultLineColor
}
seriesLabelStyle, ok := self.LabelStyles[seriesName]
if !ok {
seriesLabelStyle = ModifierClear
}
// render key ontop, but let braille be drawn over space characters
str := seriesName + " " + self.Labels[seriesName]
if len(str) > maxWid {
maxWid = len(str)
}
for k, char := range str {
if char != ' ' {
buf.SetCell(
NewCell(char, NewStyle(seriesLineColor, ColorClear, seriesLabelStyle)),
image.Pt(xoff+self.Inner.Min.X+2+k, yoff+self.Inner.Min.Y+i+1),
)
}
}
}
}
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