new Bitmap() vs bitmap.resize

[xDGameStudios]

I'm having trouble understanding the bitmap.resize method, shouldn't 
 

this.a.bitmap = new Bitmap(width, height);this.a.bitmap.gradientFillRect(0, 0, width, height, color1, color2); and,
 

this.a.bitmap.clear()this.a.bitmap.resize(width, height);this.a.bitmap.gradientFillRect(0, 0, width, height, color1, color2);do the same thing?
cus it doesn't work, can someone explain me the difference and the why?
Thank you in advance

 

[Shaz]

What happens when you try it?

 

[xDGameStudios]

What happens when you try it?

the second one doesn't work it's like the sprite doesn't get refreshed :/

the sprite moves so the refresh/update methods are being called but the bitmap doesn't resize..

 

[DarknessFalls]

I'm having trouble understanding the bitmap.resize method, shouldn't 

this.a.bitmap = new Bitmap(width, height);this.a.bitmap.gradientFillRect(0, 0, width, height, color1, color2); and,

this.a.bitmap.clear()this.a.bitmap.resize(width, height);this.a.bitmap.gradientFillRect(0, 0, width, height, color1, color2);do the same thing?

cus it doesn't work, can someone explain me the difference and the why?

Thank you in advance

resizing a bit map will resize an exhausting bitmap where as a new one will create a new bitmap. Thats the core difference.