spx: type for any Sprite instance

[nighca]

Define type for "any Sprite instance", e.g.

type ISprite interface {
	IEventSink
	Animate(name string)
	Ask(msg interface{})
	BounceOffEdge()
	Bounds() *math32.RotatedRect
	ChangeEffect(kind EffectKind, delta float64)
	ChangeHeading(dir float64)
	ChangePenColor(delta float64)
	ChangePenHue(delta float64)
	ChangePenShade(delta float64)
	ChangePenSize(delta float64)
	ChangeSize(delta float64)
	ChangeXYpos(dx float64, dy float64)
	ChangeXpos(dx float64)
	ChangeYpos(dy float64)
	ClearGraphEffects()
	CostumeHeight() float64
	CostumeIndex() int
	CostumeName() string
	CostumeWidth() float64
	Destroy()
	Die()
	DistanceTo(obj interface{}) float64
	Glide__0(x float64, y float64, secs float64)
	Glide__1(obj interface{}, secs float64)
	GoBackLayers(n int)
	Goto(obj interface{})
	GotoBack()
	GotoFront()
	Heading() float64
	Hide()
	HideVar(name string)
	InitFrom(src *Sprite)
	IsCloned() bool
	Move__0(step float64)
	Move__1(step int)
	NextCostume()
	OnCloned__0(onCloned func(data interface{}))
	OnCloned__1(onCloned func())
	OnMoving__0(onMoving func(mi *MovingInfo))
	OnMoving__1(onMoving func())
	OnTouched__0(onTouched func(obj *Sprite))
	OnTouched__1(onTouched func())
	OnTouched__2(name string, onTouched func(obj *Sprite))
	OnTouched__3(name string, onTouched func())
	OnTouched__4(names []string, onTouched func(obj *Sprite))
	OnTouched__5(names []string, onTouched func())
	OnTurning__0(onTurning func(ti *TurningInfo))
	OnTurning__1(onTurning func())
	Parent() *Game
	PenDown()
	PenUp()
	PrevCostume()
	Quote__0(message string)
	Quote__1(message string, secs float64)
	Quote__2(message string, description string, secs ...float64)
	Say(msg interface{}, secs ...float64)
	SetCostume(costume interface{})
	SetDying()
	SetEffect(kind EffectKind, val float64)
	SetHeading(dir float64)
	SetPenColor(color color.RGBA)
	SetPenHue(hue float64)
	SetPenShade(shade float64)
	SetPenSize(size float64)
	SetRotationStyle(style RotationStyle)
	SetSize(size float64)
	SetXYpos(x float64, y float64)
	SetXpos(x float64)
	SetYpos(y float64)
	Show()
	ShowVar(name string)
	Size() float64
	Stamp()
	Step__0(step float64)
	Step__1(step int)
	Step__2(step float64, animname string)
	Think(msg interface{}, secs ...float64)
	Touching(obj interface{}) bool
	TouchingColor(color color.RGBA) bool
	Turn(val interface{})
	TurnTo(obj interface{})
	Visible() bool
	Xpos() float64
	Ypos() float64
}

type IEventSink interface {
	OnAnyKey(onKey func(key Key))
	OnBackdrop__0(onBackdrop func(name string))
	OnBackdrop__1(name string, onBackdrop func())
	OnClick(onClick func())
	OnKey__0(key Key, onKey func())
	OnKey__1(keys []Key, onKey func(Key))
	OnKey__2(keys []Key, onKey func())
	OnMsg__0(onMsg func(msg string, data interface{}))
	OnMsg__1(msg string, onMsg func())
	OnStart(onStart func())
	Stop(kind StopKind)
}

Usage

var (
	enemies []ISprite
)


func addEnemy(s ISprite) {
	enemies = append(enemies, s)
}

func removeEnemy(s ISprite) {
	for i, e := range enemies {
		if e == s {
			enemies = append(enemies[:i], enemies[i+1:]...)
			break
		}
	}
}

func countEnemy() int {
	return len(enemies)
}

func isAttacked(from ISprite, to ISprite) bool {
	if int(from.heading()) == Right {
		return to.xpos() > from.xpos() && to.xpos() < from.xpos()+50
	}
	if int(from.heading()) == Left {
		return to.xpos() < from.xpos() && to.xpos() > from.xpos()-50
	}
	return false
}

func findEnemyAttacked(from ISprite) ISprite {
	for _, e := range enemies {
		if isAttacked(from, e) {
			return e
		}
	}
	return nil
}

[nighca]

Related: goplus/spx#316

[nighca]

• Strange behavior of OnTouched spx#298
• related code snippet change