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Creating Masks... Alpha Value

 
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CT_Bolt



Joined: 04 Mar 2006
Posts: 14
Location: Computer Chair
PostPosted: Mon Mar 27, 2006 5:29 am    Post subject: Creating Masks... Alpha Value Reply with quote
Ok so I know how to blit Alpha Images over top of other images but, only in rectangles.

Is there a way to just blit the image to the screen with an Alpha Mask like... it just draws an alpha value over the image only(with transparent parts).

This is so I can make just the player have a different tint instead of the rectangle of the player have the different tint.

Please any help would be much appreciated.
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my psprecious



Joined: 17 Feb 2006
Posts: 24
PostPosted: Tue Mar 28, 2006 10:14 am    Post subject: Reply with quote
Why do you need it (well I already founs a use hehe), actually understand what your problem is, you want an image to overlay over and other, or are you trying to make the collision with the alpha of a character, if yes dude don't waste your time with that, rectangle for colision will do the trick.
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Kameku



Joined: 23 Mar 2006
Posts: 32
Location: Oregon, USA
PostPosted: Tue Mar 28, 2006 10:37 am    Post subject: Reply with quote
I'm pretty sure this would be rediculously not neccessary lol

Code:

image = Image.load("myimage.png")
grey = Color.new(127,127,127,127)

for y=1,image:width() do
 for x=1,image:height() do
  color = image:pixel(x,y)
  rgb = color:colors()
  if rgb:a() == 0 then
   image:fillRect(x,y,1,1,grey)
  end
 end
end


Not entirely sure that would work, but hey, worth a try.
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CT_Bolt



Joined: 04 Mar 2006
Posts: 14
Location: Computer Chair
PostPosted: Wed Mar 29, 2006 1:39 am    Post subject: Well... Reply with quote
With a litle bit of adjustments this actually works pretty well.
Here is the function I wrote with the help of Kameku's code:

Code:
function Image:DrawAlpha(X, Y, MaskColour, BGColour)
  if MaskColour then
    if not X then X = 0 end
    if not Y then Y = 0 end
    imgAlpha = Image.createEmpty(self:width(), self:height())
    for YPos=0,self:width()-1 do
     for XPos=0,self:height()-1 do
      color = self:pixel(XPos,YPos)
      rgb = color:colors()
      if rgb.a == 0 then
        if BGColour then screen:fillRect(XPos,YPos,1,1,BGColour) end
      else
        imgAlpha:fillRect(XPos,YPos,1,1,MaskColour)
      end
     end
    end
    screen:blit(X, Y, imgAlpha)
  end
end


Call it like this:
Code:
imgStar = Image.load("Star.PNG")
imgStar:DrawAlpha(0,0,Color.new(200,0,0,200))


AND... THANK YOU SO MUCH Kameku!!!
With this I can create lots of cool stuff.
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