83. A bit of fun – the Matrix effect

This little program gives you a Matrix* type version of any image, like this

(*or maybe, I mean dot matrix, for those who remember what that means).

I won’t bother commenting the code, it is pretty simple. Basically, it creates random streaks down a black image, adjusting the intensity of the green for each pixel, to the intensity of the same pixel on the original image.

The original image for the picture above is here

Here is the code

function setup()
    img2=readImage('Planet Cute:Character Princess Girl') --choose your image here
    w,h=img2.width,img2.height
    --create copy, make black background
    img=image(w,h)
    setContext(img)
    fill(0)
    rect(0,0,w,h)
    setContext()
end

function draw()
    background(220)
    sprite(img,WIDTH/2,HEIGHT/2)
    addDrip()
end

function addDrip()
    for k=1,1000 do   --set this smaller to draw slower, for effect
        x,y,n,b=math.random(1,w),math.random(1,h),math.random(2,15),math.random(100,255)
        for i=1,n do
            local yy=y-i if yy0 then break end
            --adjust intensity to original image pixel
            r,g,b,a=img2:get(x,yy)
            local j=.21*r+.71*g+.08*b  --intensity weightings
            img:set(x,yy,0,j*d,0)
        end
    end
end

There are a couple of nice Matrix type dripping text effects on the Codea forum. Like this.

(Incidentally, if you ever search for anything on the forum, don’t use the built in search box, because it only goes back 2 days. Use normal Google instead, which goes back 18 months or more).

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