Almost working version with vicious had to over-ride the default render function.

screenplot.go

@@ -4,79 +4,64 @@ package main
 
 import (
 	"fmt"
-	"image"
-	"image/color"
-	"image/draw"
+	"math"
 	ui "github.com/gizak/termui/v3"
 	"github.com/gizak/termui/v3/widgets"
 )
 
 func breaker(x interface{}) {}
-func scrnPlt(pi, stdErr []float32) error {
-	nrmlStyle := ui.NewStyle (ui.ColorBlack, ui.ColorClear)
-//	invisStyle := ui.NewStyle (ui.ColorClear, ui.ColorClear)
-	thm := ui.Theme
-	thm.Block.Title = nrmlStyle
-	thm.Plot.Axes = ui.ColorBlack
+func copyToData (y []float32) ([][]float64){
+	data := make([]float64, len(y))
+	for i := range y {
+		data[i] = float64(y[i])
+	}
+	data[0] = data[1]
+	return [][]float64{data}
+}
 
-	thm.Default = ui.NewStyle(ui.ColorBlack, ui.ColorClear)
-	thm.Block.Border = nrmlStyle
 		
-	ui.Theme = thm
+func scrnPlt(pi, stdErr []float32) error {
+	fmt.Println()
+	marker := widgets.MarkerDot
+	dotMarkerRune := '.'
 	
-	ptxt := widgets.NewParagraph()
 
-	for i := 0; i < 24; i++ {
-		for j := 0; j < 800; j++ { 
-			ptxt.Text += "."
-		}
-		ptxt.Text += " \n"
-	}
-	
-	ptxt.SetRect(0, 0, 80, 24)
-	ptxt.TextStyle = ui.NewStyle(ui.ColorWhite, ui.ColorWhite)
 	p1 := widgets.NewPlot()
-
 	p1.Title = "π"
-	{
-		data := make([][]float64, 2)
-		data[0] = make([]float64, len(pi))
-		data[1] = make([]float64, len(pi))
-		for i := range pi {
-			data[0][i] = float64(i + 1)
-			data[1][i] = float64(pi[i])
-		}
-		p1.Data = data
-	}
-
-	p1.SetRect(2, 2, 80, 24)
-	p1.Block.TitleStyle = nrmlStyle
-	p1.AxesColor = ui.ColorBlack
-//	p1.LineColors = []ui.Color{ui.ColorBlack, ui.ColorBlack}
-	p1.SetRect (0, 0, 80, 24)
-	p1.Marker = widgets.MarkerBraille
+	p1.Data = copyToData (pi)
+	p1.Marker = marker
+	p1.DotMarkerRune = dotMarkerRune
 	p1.PlotType = widgets.ScatterPlot
-	p1.Border = false
+	p1.Border = true
 
-	breaker(thm)
+	p2 := widgets.NewPlot()
+	p2.Title = "standard error"
+	p2.Data = copyToData (stdErr)
+	p2.DotMarkerRune = dotMarkerRune
+	p2.Marker = marker
 
-	m := image.NewRGBA(image.Rect(0, 0, 80, 24))
+	p3 := widgets.NewPlot()
+	p3.Title = "abs error"
+	{
+		d := make ([]float64, len(pi))
+		for i, piV := range pi {
+			d[i] = math.Pi - float64(piV)
+		}
+		p3.Data = [][]float64{d}
+	}
 
-	//	draw.Draw(m, m.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)
-	draw.Draw(m, m.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)
-	img := widgets.NewImage(m)
-	img.SetRect(0, 0, 100, 50)
 
-	defer  fmt.Println ("m bounds", m.Bounds())
 
 	if err := ui.Init(); err != nil {
 		return err
 	}
-
-
 	defer ui.Close()
+	grid := ui.NewGrid()
+	termWidth, termHeight := ui.TerminalDimensions()
+	grid.SetRect(0, 0, termWidth, termHeight)
+	grid.Set (ui.NewRow(1./3, p1), ui.NewRow(1./3, p2), ui.NewRow(1./3, p3))
 	
-	ui.Render(img, ptxt, p1)
+	render(grid)
 	for e := range ui.PollEvents() {
 		if e.Type == ui.KeyboardEvent {
 			break
@@ -84,3 +69,14 @@ func scrnPlt(pi, stdErr []float32) error {
 	}
 	return nil
 }
+
+// This was how I wanted to do it, but the library does
+// not seem to respect background colours.
+//	ui.Theme = thm
+// nrmlStyle := ui.NewStyle (ui.ColorWhite, ui.ColorBlack)
+// thm := ui.Theme
+// thm.Block.Title = nrmlStyle
+// thm.Plot.Axes = ui.ColorWhite
+// thm.Plot.Lines = []ui.Color{ui.ColorWhite}
+// thm.Default = ui.NewStyle(ui.ColorWhite, ui.ColorBlack)
+// thm.Block.Border = nrmlStyle