Old CRT shake and flicker effect

Code Sharing
1 

    xx = math.random(3) - 2
    yy = math.random(3) - 2
    translate(xx,yy)

An effect to recreate jiggly old CRTs

I put it at the start of the draw loop in sprite invaders and it looks great (actually it looks bad but that’s the point)

This simple effect can also be used when you want to show a game shaking (explosion, big Dino footsteps, etc). Just increase the numbers.

For something I may be working on I used this on a flame. Instead of translate, I used it to flicker the tip of the flame. 11 minus 6.

2

LOL - that’s fun.

Reminds me of this http://www.cultofmac.com/78961/turn-terminal-app-into-a-flickering-vintage-crt-with-cathode/

3

The flame is here http://ipad41001.posterous.com/biochar-app-v000-in-codea

4

Was thinking about neon lights

function draw()
    isCRT = false
    --isCRT = true
    background(40, 40, 50)
    if isCRT then
        
        font("Inconsolata")
        fill(0, 255, 27, 255)
    else --neon sign
        font("MarkerFelt-Thin")
        fill(255, 0, 232, 255)
    end
    tw = 800 --text width
    th = 200 --text height
    fs = 200 --fontsize
    i = image(tw/10,th/10)
    fontSize(fs/10)
    setContext(i)
    text("Codea",tw/20,th/20)
    setContext()
    if isCRT then 
        fill(0, 255, 27, 255)
        xx = math.random(3) - 2
        yy = math.random(3) - 2
        translate(xx,yy)
    else --neon
        fill(255, 0, 232, 127)
    end
    if math.random() > .01 then
        sprite(i,WIDTH/2,HEIGHT/2,tw,th)
    end
    fontSize(fs)
    text("Codea",WIDTH/2,HEIGHT/2)
end
5

I was fiddling around with a title screen for Orb-Bits, and found it amazing just how much pure random fud could be pushed out to generate “static.” In its simplest implementation:

for i = 1, 1000 do
        rect(math.random(WIDTH), math.random(HEIGHT), 1, 1)
end

I wouldn’t use it as background for anything more active than a title screen. I’m just amazed that it works even when nothing else is going on.

6

Nice effect, it really triggers pattern recognition, I see so much that isn’t there in it, just like real static.

7

A slightly different pattern of static

function setup()
    
end

function draw()
    pr = image(WIDTH,1)
    for x = 1, WIDTH do
        dot = math.random(125)
        pr:set(x,1,dot,dot,dot,255)
    end
    for y = 1, HEIGHT do
        pps = math.random(WIDTH)
        --sprite(pr,(WIDTH/2)-ps[y],y)
        --sprite(pr,WIDTH+(WIDTH/2)-ps[y],y)
        sprite(pr,(WIDTH/2)-pps,y)
        sprite(pr,WIDTH+(WIDTH/2)-pps,y)
    end
end