Centered player example

game.go

package main

import (
	"fmt"
	"github.com/nsf/termbox-go"
)

func tbPrint(x, y int, fg, bg termbox.Attribute, msg string) {
	for _, c := range msg {
		termbox.SetCell(x, y, c, fg, bg)
		x++
	}
}

func draw(playerX int, playerY int) {
	termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
	defer termbox.Flush()

	w, h := termbox.Size()

	startX := playerX - w / 2
	startY := playerY - h / 2

	for x := 0; x < w; x++ {
		for y := 0; y < h; y++ {
			tbPrint(x, y, termbox.ColorBlue, termbox.ColorDefault, "~")
		}
	}

	// The player
	tbPrint(w/2, h/2, termbox.ColorRed, termbox.ColorDefault, "O")

	// The static object
	tbPrint(90 - startX, 90 - startY, termbox.ColorRed, termbox.ColorDefault, "X")
}

func main() {
	err := termbox.Init()
	if err != nil {
		panic(err)
	}
	termbox.SetInputMode(termbox.InputEsc)

	playerX := 100
	playerY := 100
	draw(playerX, playerY)

	mainLoop:
	for {
		switch ev := termbox.PollEvent(); ev.Type {
			case termbox.EventKey:
				key := string(ev.Ch)

				if key == "q" {
					break mainLoop
				}

				if key == "w" {
					playerY--
				}

				if key == "s" {
					playerY++
				}

				if key == "a" {
					playerX--
				}

				if key == "d" {
					playerX++
				}

				draw(playerX, playerY)
		}
	}

	termbox.Close()

	fmt.Println("Done")
}