new Drawable()
Drawable
Drawableとは描画できる物。
Drawable自体はあんまり機能付いてないが、これをprototypeにして描画できる画像や文字を作れます。
drawOnContext function(context) 指定されたcontextに描画します
Parameters:
| Type | Description |
|---|---|
| Rect |
- Implements:
Members
(constant) initializer :string
The name of constructor the class, will be used to restore the object.
The constructor has to be accessable via
window[initializer]
Type:
- string
- Implements:
Methods
canDrawPartial() → {boolean}
Can it draw only a certain part?
If yes, drawContext will be called with rect, and drawable should draw only in that rect.
Drawing less = better performance.
Returns:
- Type
- boolean
drawOnContext(context, rect)
Draw on this context.
If canDrawPartial is true, this can be called with rect.
When it is called with rect, drawable should only draw in the specificed area.
Parameters:
| Name | Type | Description |
|---|---|---|
context |
CanvasRenderingContext2D | |
rect |
Rect | In the context's coordinate. |
frame() → {Rect}
Return the frame, which is the actually area this drawable draws on (including things like shadow).
Subclass should override if needed.
Returns:
- Type
- Rect