gui

type Color termbox.Attribute

type Interface interface {
	// SpriteSize returns the width and height of each tile.
	SpriteSize() (w, h int)

	// PreRender is called with the width and height in tiles of the screen before
	// SpriteAt is called during a frame.
	PreRender(w, h int)

	// SpriteAt returns the Sprite at (x, y) on the screen.
	SpriteAt(x, y, w, h int) *Sprite

	// Mouse is called when the user left clicks on the screen.
	Mouse(x, y, w, h int)

	// Rune is called when a character is entered on the keyboard. Return false if
	// the OS should handle the key event instead.
	Rune(r rune) (handled bool)

	// Key is called when a special key is pressed on the keyboard. Return false if
	// the OS should handle the key event instead. The default action for Escape is
	// to exit the program.
	Key(k Key) (handled bool)

	// Closing is called before the user exits the program. Return false to cancel.
	Closing() (allow bool)
}

type Key uint

type Sprite struct {
	Images []image.Image
	Rune   rune
	Fg, Bg Color
}