util.go

package main

import termbox "github.com/nsf/termbox-go"

// tbprint prints the msg at (x,y) position of the grid.
func tbprint(msg string, x, y int, fg, bg termbox.Attribute) {
	for _, c := range msg {
		termbox.SetCell(x, y, c, fg, bg)
		x++
	}
}

// fill draws a rectangle at position (x,y) with area of w*h and fills the
// inside with r.
func fill(x, y, w, h int, r rune) {
	for ly := 0; ly < h; ly++ {
		for lx := 0; lx < w; lx++ {
			termbox.SetCell(x+lx, y+ly, r, fgcolor, bgcolor)
		}
	}
}

// drawRect draws a rectangle with unicode borders at position (x,y) with area
// of w*h.
func drawRect(x, y, w, h int) {
	drawRectWithAttr(x, y, w, h, fgcolor, bgcolor)
}

// drawRectWithAttr draws a rectangle with unicode borders at position (x,y) with area of
// w*h with the given foreground and background attributes. Attributes can be
// colors and/or styling.
func drawRectWithAttr(x, y, w, h int, fgattr, bgattr termbox.Attribute) {
	// top border
	termbox.SetCell(x-1, y-1, '┌', fgattr, bgattr)
	fill(x, y-1, w, 1, '─')
	termbox.SetCell(x+w, y-1, '┐', fgattr, bgattr)

	// body border
	fill(x-1, y, 1, h, '│')
	fill(x+w, y, 1, h, '│')

	// bottom border
	termbox.SetCell(x-1, y+h, '└', fgcolor, bgcolor)
	fill(x, y+h, w, 1, '─')
	termbox.SetCell(x+w, y+h, '┘', fgcolor, bgcolor)
}