A simple golang sprite library for animating ASCII and Unicode art

What is a sprite? A sprite is a two-dimensional object which you can use in videogames and animations.

Features

• Easy to use routines for creating and manipulating text sprites

• Block interpolation for creating unicode "pixel" graphics

• Simple ascii "fonts" for creating block based text

• Event system for triggering sprite events

Usage

package main

import (
        "time"

        sprite "github.com/pdevine/go-asciisprite"
        tm "github.com/pdevine/go-asciisprite/termbox"
)

var allSprites sprite.SpriteGroup
var Width int
var Height int

const cow_c0 = `
^__^xxxxxxxxxxxx
(oo)\_______
(__)\       )\/\
xxxx||----w |xxx
xxxx||xxxxx||xxx
`

type Cow struct {
	sprite.BaseSprite
	VX int
	VY int
}

func NewCow() *Cow {
	cow := &Cow{BaseSprite: sprite.BaseSprite{
		X: 5,
		Y: 5,
		Visible: true},
		VX: 1,
		VY: 1,
	}
	cow.AddCostume(sprite.NewCostume(cow_c0, 'x'))

	return cow
}

func (cow *Cow) Update() {
	cow.X += cow.VX
	cow.Y += cow.VY
	if cow.X <= 0 {
		cow.VX = 1
	} else if cow.X >= (Width-cow.Width) {
		cow.VX = -1
	}
	if cow.Y <= 0 {
		cow.VY = 1
	} else if cow.Y >= (Height-cow.Height) {
		cow.VY = -1
	}
}


func main() {
	err := tm.Init()
	if err != nil {
		panic(err)
	}
	defer tm.Close()

	Width, Height = tm.Size()

	event_queue := make(chan tm.Event)
	go func() {
		for {
			event_queue <- tm.PollEvent()
		}
	}()

	cow := NewCow()
	c := sprite.NewCostume("Press 'ESC' to quit", '~')
	text := sprite.NewBaseSprite(Width/2-c.Width/2, Height-2, c)

	allSprites.Sprites = append(allSprites.Sprites, cow)
	allSprites.Sprites = append(allSprites.Sprites, text)

mainloop:
	for {
		tm.Clear(tm.ColorDefault, tm.ColorDefault)

		select {
		case ev := <-event_queue:
			if ev.Type == tm.EventKey {
				if ev.Key == tm.KeyEsc {
					break mainloop
				}
			} else if ev.Type == tm.EventResize {
				Width = ev.Width
				Height = ev.Height
			}
		default:
			allSprites.Update()
			allSprites.Render()
			time.Sleep(60 * time.Millisecond)
		}
	}
}

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