spx: type for any Sprite instance

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
}

goplus / builder

spx: type for any Sprite instance #753

Usage