Make unicode tables

uni.go

// uni: make glyph tables
package main

import (
	"flag"
	"fmt"
	"os"

	"github.com/ajstarks/svgo"
)

func main() {
	begin := flag.String("begin", "20", "begin (hex)")
	font := flag.String("font", "Calibri,sans-serif", "font")
	fsize := flag.Int("fs", 18, "font size (px)")
	rows := flag.Int("rows", 20, "rows")
	cols := flag.Int("cols", 16, "columns")
	flag.Parse()

	offset := *fsize* 2
	top := offset * 2
	left := offset * 3
	spacing := 5
	
	b := 32
	nb, err := fmt.Sscanf(*begin, "%x", &b)
	if b < 32 || nb != 1 || err != nil {
		b = 32
	}

	x := left
	y := top
	canvas := svg.New(os.Stdout)
	canvas.Start(1600, 900)
	canvas.Gstyle(fmt.Sprintf("font-family:%s;font-size:%dpx;text-anchor:middle", *font, *fsize))
	for r := 0; r < *rows; r++ {
		canvas.Text(x-offset, y, fmt.Sprintf("%X", b), "text-anchor:end;fill:lightgray")
		for c := 0; c < *cols; c++ {
			if r == 0 {
				canvas.Text(x, y-offset, fmt.Sprintf("%02X", c), "fill:lightgray")
			}
			canvas.Text(x, y, string(b))
			b++
			x += (offset + spacing)
		}
		x = left
		y += offset
	}
	canvas.Gend()
	canvas.End()
}