How is Sprite's width and height calculated?

[caymanbruce]

I build my sprites from a canvas object I created, which is bascially a circle with a radius at most 28 pixels. I built it with Canvas API.

Then I use Texture.fromCanvas(canvas);

Then Sprite.from(texture); 

However when I try to watch the sprite's width and height, I get 300 and 150. I wonder how are these two values calculated. What I need is a sprite as big as 30 x 30 at most. Why does it give me a 300 x 150 sprite? If I need to do some hitTest check I can't use the sprite's width and height directly. I have to use the radius of my canvas object.This is very inconvenient.

[Fatalist]

That's the default size of a canvas element, you should set its .width and .height to 30.