forked from gizak/termui
/
plot.go
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/
plot.go
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// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package widgets
import (
"fmt"
"image"
. "github.com/madhuravius/termui/v3"
)
// Plot has two modes: line(default) and scatter.
// Plot also has two marker types: braille(default) and dot.
// A single braille character is a 2x4 grid of dots, so using braille
// gives 2x X resolution and 4x Y resolution over dot mode.
type Plot struct {
Block
Data [][]float64
DataLabels []string
MinVal float64
MaxVal float64
LineColors []Color
AxesColor Color // TODO
ShowAxes bool
Marker PlotMarker
DotMarkerRune rune
PlotType PlotType
HorizontalScale int
DrawDirection DrawDirection // TODO
}
const (
xAxisLabelsHeight = 1
yAxisLabelsWidth = 4
xAxisLabelsGap = 2
yAxisLabelsGap = 1
)
type PlotType uint
const (
LineChart PlotType = iota
ScatterPlot
)
type PlotMarker uint
const (
MarkerBraille PlotMarker = iota
MarkerDot
)
type DrawDirection uint
const (
DrawLeft DrawDirection = iota
DrawRight
)
func NewPlot() *Plot {
return &Plot{
Block: *NewBlock(),
LineColors: Theme.Plot.Lines,
AxesColor: Theme.Plot.Axes,
Marker: MarkerBraille,
DotMarkerRune: DOT,
Data: [][]float64{},
HorizontalScale: 1,
DrawDirection: DrawRight,
ShowAxes: true,
PlotType: LineChart,
}
}
func (self *Plot) renderBraille(buf *Buffer, drawArea image.Rectangle, minVal float64, maxVal float64) {
canvas := NewCanvas()
canvas.Rectangle = drawArea
h := maxVal - minVal
switch self.PlotType {
case ScatterPlot:
for i, line := range self.Data {
for j, val := range line {
height := int(((val - minVal) / h) * float64(drawArea.Dy()-1))
canvas.SetPoint(
image.Pt(
(drawArea.Min.X+(j*self.HorizontalScale))*2,
(drawArea.Max.Y-height-1)*4,
),
SelectColor(self.LineColors, i),
)
}
}
case LineChart:
for i, line := range self.Data {
previousHeight := int((line[1] / maxVal) * float64(drawArea.Dy()-1))
for j, val := range line[1:] {
height := int(((val - minVal) / h) * float64(drawArea.Dy()-1))
canvas.SetLine(
image.Pt(
(drawArea.Min.X+(j*self.HorizontalScale))*2,
(drawArea.Max.Y-previousHeight-1)*4,
),
image.Pt(
(drawArea.Min.X+((j+1)*self.HorizontalScale))*2,
(drawArea.Max.Y-height-1)*4,
),
SelectColor(self.LineColors, i),
)
previousHeight = height
}
}
}
canvas.Draw(buf)
}
func (self *Plot) renderDot(buf *Buffer, drawArea image.Rectangle, minVal float64, maxVal float64) {
h := maxVal - minVal
switch self.PlotType {
case ScatterPlot:
for i, line := range self.Data {
for j, val := range line {
height := int(((val - minVal) / h) * float64(drawArea.Dy()-1))
point := image.Pt(drawArea.Min.X+(j*self.HorizontalScale), drawArea.Max.Y-1-height)
if point.In(drawArea) {
buf.SetCell(
NewCell(self.DotMarkerRune, NewStyle(SelectColor(self.LineColors, i))),
point,
)
}
}
}
case LineChart:
for i, line := range self.Data {
for j := 0; j < len(line) && j*self.HorizontalScale < drawArea.Dx(); j++ {
val := line[j]
height := int(((val - maxVal) / h) * float64(drawArea.Dy()-1))
buf.SetCell(
NewCell(self.DotMarkerRune, NewStyle(SelectColor(self.LineColors, i))),
image.Pt(drawArea.Min.X+(j*self.HorizontalScale), drawArea.Max.Y-1-height),
)
}
}
}
}
func (self *Plot) plotAxes(buf *Buffer, minVal float64, maxVal float64) {
h := maxVal - minVal
// draw origin cell
buf.SetCell(
NewCell(BOTTOM_LEFT, NewStyle(ColorWhite)),
image.Pt(self.Inner.Min.X+yAxisLabelsWidth, self.Inner.Max.Y-xAxisLabelsHeight-1),
)
// draw x axis line
for i := yAxisLabelsWidth + 1; i < self.Inner.Dx(); i++ {
buf.SetCell(
NewCell(HORIZONTAL_DASH, NewStyle(ColorWhite)),
image.Pt(i+self.Inner.Min.X, self.Inner.Max.Y-xAxisLabelsHeight-1),
)
}
// draw y axis line
for i := 0; i < self.Inner.Dy()-xAxisLabelsHeight-1; i++ {
buf.SetCell(
NewCell(VERTICAL_DASH, NewStyle(ColorWhite)),
image.Pt(self.Inner.Min.X+yAxisLabelsWidth, i+self.Inner.Min.Y),
)
}
// draw x axis labels
// draw 0
buf.SetString(
"0",
NewStyle(ColorWhite),
image.Pt(self.Inner.Min.X+yAxisLabelsWidth, self.Inner.Max.Y-1),
)
// draw rest
for x := self.Inner.Min.X + yAxisLabelsWidth + (xAxisLabelsGap)*self.HorizontalScale + 1; x < self.Inner.Max.X-1; {
label := fmt.Sprintf(
"%d",
(x-(self.Inner.Min.X+yAxisLabelsWidth)-1)/(self.HorizontalScale)+1,
)
buf.SetString(
label,
NewStyle(ColorWhite),
image.Pt(x, self.Inner.Max.Y-1),
)
x += (len(label) + xAxisLabelsGap) * self.HorizontalScale
}
// draw y axis labels
verticalScale := h / float64(self.Inner.Dy()-xAxisLabelsHeight-1)
for i := 0; i*(yAxisLabelsGap+1) < self.Inner.Dy()-1; i++ {
yVal := minVal + float64(i)*verticalScale*(yAxisLabelsGap+1)
buf.SetString(
fmt.Sprintf("%.2f", yVal),
NewStyle(ColorWhite),
image.Pt(self.Inner.Min.X, self.Inner.Max.Y-(i*(yAxisLabelsGap+1))-2),
)
}
}
func (self *Plot) Draw(buf *Buffer) {
self.Block.Draw(buf)
maxVal := self.MaxVal
minVal := self.MinVal
if maxVal == 0 {
maxVal, _ = GetMaxFloat64From2dSlice(self.Data)
minVal, _ = GetMinFloat64From2dSlice(self.Data)
}
if self.ShowAxes {
self.plotAxes(buf, minVal, maxVal)
}
drawArea := self.Inner
if self.ShowAxes {
drawArea = image.Rect(
self.Inner.Min.X+yAxisLabelsWidth+1, self.Inner.Min.Y,
self.Inner.Max.X, self.Inner.Max.Y-xAxisLabelsHeight-1,
)
}
switch self.Marker {
case MarkerBraille:
self.renderBraille(buf, drawArea, minVal, maxVal)
case MarkerDot:
self.renderDot(buf, drawArea, minVal, maxVal)
}
}