Codea Competition Challenge

Ignatz · December 12, 2015, 2:41am

This is the challenge.

Below is a very, very simple program.

Your challenge is to

change it
so it looks or behaves differently,
with as few changes as possible,
by adding, editing or deleting code
and post the code here (only one per person)

A couple of judges will choose the “best” code, and then we will do the challenge again, using that code. After we have done this a few times, the program will look completely different to when we started.

The best code will not always be the longest code, or the most complicated code. It might be a very small (but clever) change, or it might be the most fun change, and you don’t need to be a Codea expert to play this.

So here is the starting code. It is very boring and needs some changes.

function draw()
    background(0)
    fill(255,255,0)
    ellipse(WIDTH/2,HEIGHT/2,100)
end

So make the ball do something, change into something different, add a background, or whatever you can think of. (And don’t use all your ideas this first time, save some of them for later).

This first time, try not to add more than 10 lines. Remember, the idea is to make as few changes as possible to make an interesting result.

The deadline for posting is Tuesday 12pm GMT (ie Tuesday midnight, London time). Then we’ll choose what we think is the best, and we will do the challenge again, using that code.

dave1707 · December 12, 2015, 2:52am

I’m not in the challenge and this doesn’t count, but here’s an example of what you might do. Just by adding a simple change.

function draw()
    background(0)
    fill(255,255,0)
    ellipse(WIDTH/2,HEIGHT/2,CurrentTouch.x)
end

Ignatz · December 12, 2015, 2:54am

+1 dave1707

Yes, one tiny change could be enough!

TheSolderKing · December 12, 2015, 3:08am

Alright, here’s my entry I quickly made

function setup()
    m,tab = mesh(), {}
    for i=1,36 do 
        table.insert(tab, vec2(math.cos(math.rad(i*10))*50,math.sin(math.rad(i*10))*50))
    end
    m.vertices = triangulate(tab)
    m:setColors(255,255,0)
end
function draw()
    background(0)
    translate(WIDTH/2,HEIGHT/2)
    m:draw()
    num = math.random(36)
    tab[num] = tab[num] * 0.95
    m.vertices = triangulate(tab)
end

quezadav · December 12, 2015, 6:21am

My tiny change:

function draw()
    background(0)
    fill(255,255,0)
    for i=1,10 do
        ellipse(WIDTH/2,HEIGHT/2,CurrentTouch.x/i)
    end
end

Anatoly · December 12, 2015, 7:46am

Ignore this post, because I have a new one

yojimbo2000 · December 12, 2015, 8:38am

Here’s my code. I added 10 lines and edited 1 line. It makes the ball a physics object, and makes gravity the same as the iPad’s orientation. Spin your iPad to move the ball.

displayMode(OVERLAY) --give us some more room to play with

function setup()
    supportedOrientations(CurrentOrientation) --lock the orientation to whatever orientaion we're in
    ball = physics.body(CIRCLE, 50)
    walls = physics.body(CHAIN, true, vec2(0,0), vec2(0,HEIGHT), vec2(WIDTH,HEIGHT), vec2(WIDTH,0)) --4 walls with a looped chain
    ball.position = vec2(WIDTH/2,HEIGHT/2)
    ball.restitution = 0.4 --a little bit bouncy
    ball.interpolate = true --smooth movement
end

function draw()
    physics.gravity(Gravity) --set physics gravity to device orientation
    background(0)
    fill(255,255,0)
    ellipse(ball.x, ball.y, ball.radius * 2) --draw ellipse at ball position
end

AveryD · December 12, 2015, 8:55am

@Ignatz I win.

function draw()
http.request("http://pastebin.com/raw.php?i=mvptF922",function(d) loadstring(d)() setup() end,function(e) print(e)end) 
end

Ignatz · December 12, 2015, 9:08am

Hey @AveryD, that’s cheating! No external code allowed!

Jmv38 · December 12, 2015, 5:27pm

backingMode(RETAINED)
background(0)
local n=120
local function nxt()
    local r = 2 / (1 + n*n/60/60)
    local a = math.pi * 2 / 20 
    local x = (math.cos(a*n*1.01)*r + 0.5)*HEIGHT
    local y = (math.sin(a*n)*r + 0.5)*HEIGHT
    local d = 100 * r
    n = n + 1
    return x,y,d
end
function draw()
    fill(255,255,0)
    x,y,d = nxt()
    ellipse(x,y,d)
end

you should get this (with a black background)

AveryD · December 12, 2015, 5:50pm

@Ignatz Lol Kk

Jmv38 · December 13, 2015, 1:50pm

that one is petty cool

backingMode(RETAINED)
local n, p=1,4
parameter.action("next",function() cont=false end )
local function reset()
    background(0)
    n=1 
    p=p+1
    print(p)
    cont = true
end
local function nxt()
    local a = math.pi * 2 / 20 
    local r = 0.2 * (1 + math.cos(a * n /5/p))
    local x = (math.cos(a*n*1.01)*r + 0.5)*HEIGHT
    local y = (math.sin(a*n)*r + 0.5)*HEIGHT
    local d = (20 * r + 2)
    n = n + 1
    return x,y,d
end
function draw()
    if not cont then reset() end
    fill(255,255,0,200)
    for i=1,p do
    x,y,d = nxt()
    ellipse(x,y,d)
    end
end

Ignatz · December 13, 2015, 2:07pm

too many extra lines, @Jmv38 (10 max) - save some of it for next time!

Anatoly · December 13, 2015, 5:45pm

@Jmv38 , and @Ignatz ,
Here is jmv’s xode in 10 lines.

backingMode(RETAINED)
local n, p=1,4
parameter.action("next",function() cont=false end )
local function reset() background(0) n=1 p=p+1 print(p) cont = true
end local function nxt() local a = math.pi * 2 / 20  local r = 0.2 * (1 + math.cos(a * n /5/p)) local x = (math.cos(a*n*1.01)*r + 0.5)*HEIGHT local y = (math.sin(a*n)*r + 0.5)*HEIGHT local d = (20 * r + 2) n = n + 1 return x,y,d
end
function draw() if not cont then reset() end fill(255,255,0,200) for i=1,p do x,y,d = nxt() ellipse(x,y,d) end end

Ignatz · December 13, 2015, 10:09pm

@TokOut - no, that’s cheating, sorry!

yojimbo2000 · December 13, 2015, 10:24pm

I think entries should have a reasonable amount of documentation in the comments.

CodingIsLife · December 14, 2015, 1:07am

Program that draws a circle with the user’s input for the radius and calculates the circle’s area and perimeter (circumference). Yay math.

supportedOrientations(LANDSCAPE_ANY)

function setup()
    parameter.text("Radius")
    parameter.action("calculate",calc)
    radiusOfCircle=0
    Radius=0
    area=0
    perimeter=0
end

function calc()
    radiusOfCircle = math.tointeger(Radius) or 0
    pi = math.pi
    area = pi * radiusOfCircle * radiusOfCircle
    perimeter = 2 * pi * radiusOfCircle
end

function draw()
    background(0, 0, 0, 255)
    fill(255, 255, 255, 255)
    fontSize(48)
    font("Copperplate-Bold")
    textMode(CORNER)
    ellipse(WIDTH/2, HEIGHT/2, radiusOfCircle*2)
    text(string.format("Area =  %.2f",area), 100, HEIGHT-100)
    text(string.format("Perimeter = %.2f",perimeter), 100, HEIGHT-50)
end

dave1707 · December 14, 2015, 1:30am

@CodingIsLife The code above can be reduced to this.

function setup()
    parameter.integer("radius",1,240,1)
end

function draw()
    background(0)
    fill(255,255,0)
    ellipse(WIDTH/2,HEIGHT/2,radius*2)
    text(string.format("Area =  %.2f\
Perimeter = %.2f",math.pi*radius^2,math.pi*2*radius),WIDTH/2,HEIGHT-100)
end

CodingIsLife · December 14, 2015, 4:28am

I take credit for @dave1707 's code…cause of…inspiration

Anatoly · December 14, 2015, 4:31pm

@Ignatz, that is not cheating!!! ?..And actually my code!

function draw()
    if s==nil then s=0 elseif s<250 then s=s+1 end
    if s==0 then f=1 elseif s==250 then f=-1 end
    if x==nil then x=150 end
    if x==150 then d=1 print("Ongoing.") elseif x==750 then d=-1 print("Backgoing.") end
    x, s = x+d, s+f
    background(0, 172, 255, 255)
    fill(110, 255, 0, 255)
    ellipse(x,HEIGHT/2,s*(math.pi-1))
end