adding a color method in Bitmap

[berka]

Hi,

Sorry for my quite bad English, but I am French...  :wink:

I would like to add a color method in the Bitmap class, like the Sprite's.
(Naturally, I can't and I don't want to use the color management of the Sprite class)
eg:
bmp.color=Color.new(152,25,125,55)

class Bitmap
  def color=(col)
    bmp=Bitmap.new(self.width,self.height) 
    bmp.fill_rect(0,0,self.width,self.height,col)
    self.stretch_blt(Rect.new(0,0,self.width,self.height), bmp, bmp.rect) 
    bmp.dispose
  end
end

but the transparent color management in the background is deleted.
Should I use a recolor pixel by pixel?
Has someone an answer to my question ?

thanks, :thumb:

berka

 

[e]

I'm not sure I understand your question, but you're in luck(!): my first language is French.
So just go ahead and post it in French.

So basically you've added this method (which, from what I gather, should work), but you're losing something?

As far as I know, there is no such thing as a "background" in a bitmap; a background itself is a Bitmap object.

 

[berka]

thanks for reply,
In fact, there is no background color with a bitmap.

I would like to add a kind of a colored layer to the bitmap object.
I tried to merge a second colored bmp.fill_rect with the original, but the transparent color was now colored... :crazy:

and what about the bitmap's taint method ? it retrieves another bitmap or self...

 

[Dargor]

Should I use a recolor pixel by pixel?

If you want to add a color layer to the bitmap, then yes, you'll have to recolor pixel by pixel.
Why? Simply because you can't have "layers" in a bitmap. If you draw something into a bitmap, and then want to aff let's say a transparent red rectangle over the text, then the text will be kinda erased and the rect will take the place.

Doing a pixel by pixel recolor would be quite heavy for the system. I don't recomend doing it.
I personally would use a sprite to do that. Is a lot more easier!

Hope it helps.
-Dargor

 

[berka]

thanks...
but I can't use a Sprite, because I need a bitmap to save as a png file...
I change the color bitmap once per second, therefore, the process may be slow and heavy... It doesn't matter !
Using a pixel process, how could I manage the alpha color, and transparency, since rmvx keeps the file's background color but doesn't display it.

berka

 

[berka]

*bump

please

 

[berka]

bumping again !