scrnplt.go

// 25 Jan 2020
// Given a buffer or two with a plot picture, send it to the screen

// +build !no_gfx

package ui

import (
	"bytes"
	"fmt"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/storage"
)

func tryfsave(uriw fyne.URIWriteCloser, err error, data []byte, parent fyne.Window) {
	if err != nil {
		dialog.ShowError(err, parent)
		return
	}
	if uriw == nil {
		return // cancel
	}
	if _, err := uriw.Write(data); err != nil {
		fmt.Println("error writing")
	}
	if err := uriw.Close(); err != nil {
		fmt.Println("error closing")
	}
}

func fsave(parent fyne.Window, fdata []byte, suggested string) {
	filter := storage.NewExtensionFileFilter([]string{"png", "PNG"})
	ts := func(uriw fyne.URIWriteCloser, err error) {
		tryfsave(uriw, err, fdata, parent)
	}
	t := dialog.NewFileSave(ts, parent)
	t.SetFileName(suggested)
	t.SetFilter(filter)
	t.Show()
}

func topmenu(parent fyne.Window, fdata, xdata []byte) *fyne.Menu {
	ds := func() { fsave(parent, fdata, "func_val.png") } // function values
	xs := func() { fsave(parent, xdata, "x_trj.png") } 
	c := fyne.NewMenuItem("save func plot", ds)
	d := fyne.NewMenuItem("save X trajectory plot", xs)
	return fyne.NewMenu("actions", c, d)
}

func fileSaved(f fyne.URIWriteCloser, w fyne.Window) {
	defer f.Close()
	_, err := f.Write([]byte("Written by Fyne demo\n"))
	if err != nil {
		dialog.ShowError(err, w)
	}
	err = f.Close()
	if err != nil {
		dialog.ShowError(err, w)
	}
	fmt.Println("Saved to...", f.URI())
}

func nothing(...interface{}) {}
func breaker(...interface{}) {}
func scrnplt(fdata, xdata []byte) *fyne.Container {
	fImage := canvas.NewImageFromReader(bytes.NewReader(fdata), "func.png")
	fImage.FillMode = canvas.ImageFillContain
	xImage := canvas.NewImageFromReader(bytes.NewReader(xdata), "xdata.png")
	xImage.FillMode = canvas.ImageFillContain
	content := container.NewGridWithRows(2, fImage, xImage)

//	w.Resize(fyne.NewSize(500, 600))
//	w.SetContent(content)
	//	w.ShowAndRun()
	return content
}