width and height of a sprite

Solar2D Widgets
1

Hello,

how to put an width and an height properties for the sprite ?

I only find by using the addEventListener-sprite, and changing the width and height at each frame, like below :

local sp=display.newSprite( g,sheet, sequence ) sp:addEventListener( "sprite", function(ev) sp.width=40 sp.height=40 end )

when I try by writting

sp.width=40 sp.height=40

this only change the width and height of the first sprite only, not all.

Did you have a better method ?

Thanks.

2

I always use obj:scale().

3

thanks it’s work.

Why did it works better than changing widh and height ?

4

No idea since I can’t see the internals, but I’m going to assume that width and height are transient values that are re-updated each time the sprite source image changes, where as current scale factor is permanent until changed.

Actually this is the answer:

For images, the returned value is the original bitmap width, including any transparent area.

https://docs.coronalabs.com/api/type/DisplayObject/width.html#overview

Since you are effectively changing this on each frame change, the value is getting updated.

5

Note / Word of Advice:

I always treat width and height as read-only values and use scaling exclusively to change the width and height of an object.

6

I always use obj:scale().

7

thanks it’s work.

Why did it works better than changing widh and height ?

8

No idea since I can’t see the internals, but I’m going to assume that width and height are transient values that are re-updated each time the sprite source image changes, where as current scale factor is permanent until changed.

Actually this is the answer:

For images, the returned value is the original bitmap width, including any transparent area.

https://docs.coronalabs.com/api/type/DisplayObject/width.html#overview

Since you are effectively changing this on each frame change, the value is getting updated.

9

Note / Word of Advice:

I always treat width and height as read-only values and use scaling exclusively to change the width and height of an object.