gg/object.go

package gg

// Implementing the interface type
// will call the function OnStart
// when first appear on scene BEFORE
// the OnUpdate.
// The v value will be get from Add function.
type Starter interface {
	Start(*Context)
}

// Implementing the interface type
// will call the function on each
// engine iteration.
type Updater interface {
	Update(*Context)
}

// Implementing the interface type
// will call the function on deleting
// the object.
type Deleter interface {
	Delete(*Context)
}

// Feat to embed for turning visibility on and off.
type Visibility struct {
	Visible bool
}
func (v Visibility) IsVisible() bool {
	return v.Visible
}

// Feat to embed to make colorful objects.
type Colority struct {
	Color Color
}

// The interface describes anything that can be
// drawn. It will be drew corresponding to
// the layers order so the layer must be returned.
type Drawer interface {
	Draw(*Context) []EVertex
	GetLayer() Layer
	IsVisible() bool
}

type Objecter interface {
	GetObject() *Object
	Input() chan *Context
	Starter
	Updater
	Drawer
	Deleter
}

// The type for embedding into engine-in types.
type Object struct {
	Layer
	Visibility
	input chan *Context
}

func (o *Object) GetObject() *Object { return o }
func (o *Object) Input() chan *Context { return o.input }

func (o *Object) Start(c *Context) {}
func (o *Object) Update(c *Context) {}
func (o *Object) Draw(c *Context) []EVertex { return nil}
func (o *Object) Delete(c *Context) {}