mirror of https://github.com/cjbassi/gotop.git
116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
package termui
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import (
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"fmt"
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"sort"
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drawille "github.com/cjbassi/drawille-go"
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)
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// LineGraph implements a line graph of data points.
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type LineGraph struct {
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*Block
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Data map[string][]float64
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LineColor map[string]Color
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DefaultLineColor Color
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}
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// NewLineGraph returns a new LineGraph with current theme.
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func NewLineGraph() *LineGraph {
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return &LineGraph{
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Block: NewBlock(),
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Data: make(map[string][]float64),
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LineColor: make(map[string]Color),
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DefaultLineColor: Theme.LineGraph,
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}
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}
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// Buffer implements Bufferer interface.
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func (lc *LineGraph) Buffer() *Buffer {
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buf := lc.Block.Buffer()
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// we render each data point on to the canvas then copy over the braille to the buffer at the end
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// fyi braille characters have 2x4 dots for each character
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c := drawille.NewCanvas()
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// used to keep track of the braille colors until the end when we render the braille to the buffer
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colors := make([][]Color, lc.X+2)
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for i := range colors {
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colors[i] = make([]Color, lc.Y+2)
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}
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// sort the series so that overlapping data will overlap the same way each time
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seriesList := make([]string, len(lc.Data))
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i := 0
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for seriesName := range lc.Data {
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seriesList[i] = seriesName
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i++
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}
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sort.Strings(seriesList)
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// draw lines in reverse order so that the first color defined in the colorscheme is on top
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for i := len(seriesList) - 1; i >= 0; i-- {
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seriesName := seriesList[i]
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seriesData := lc.Data[seriesName]
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seriesLineColor, ok := lc.LineColor[seriesName]
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if !ok {
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seriesLineColor = lc.DefaultLineColor
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}
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// coordinates of last point
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lastY, lastX := -1, -1
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// assign colors to `colors` and lines/points to the canvas
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for i := len(seriesData) - 1; i >= 0; i-- {
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x := ((lc.X + 1) * 2) - 1 - (((len(seriesData) - 1) - i) * 5)
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y := ((lc.Y + 1) * 4) - 1 - int((float64((lc.Y)*4)-1)*(seriesData[i]/100))
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if x < 0 { // stop rendering at the left-most wall
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break
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}
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if lastY == -1 { // if this is the first point
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c.Set(x, y)
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colors[x/2][y/4] = seriesLineColor
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} else {
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c.DrawLine(lastX, lastY, x, y)
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for _, p := range drawille.Line(lastX, lastY, x, y) {
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colors[p.X/2][p.Y/4] = seriesLineColor
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}
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}
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lastX, lastY = x, y
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}
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// copy braille and colors to buffer
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for y, line := range c.Rows(c.MinX(), c.MinY(), c.MaxX(), c.MaxY()) {
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for x, char := range line {
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x /= 3 // idk why but it works
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if x == 0 {
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continue
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}
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if char != 10240 { // empty braille character
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buf.SetCell(x, y, Cell{char, colors[x][y], lc.Bg})
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}
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}
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}
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}
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// renders key ontop
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for j, seriesName := range seriesList {
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// sorts lines again
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seriesData := lc.Data[seriesName]
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seriesLineColor, ok := lc.LineColor[seriesName]
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if !ok {
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seriesLineColor = lc.DefaultLineColor
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}
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// render key ontop, but let braille be drawn over space characters
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str := fmt.Sprintf("%s %3.0f%%", seriesName, seriesData[len(seriesData)-1])
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for k, char := range str {
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if char != ' ' {
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buf.SetCell(3+k, j+2, Cell{char, seriesLineColor, lc.Bg})
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}
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}
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}
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return buf
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}
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