I've decided to give Codea a try and found an issue I can't resolve. Simply put, does Codea notify the running script that the user has pressed the home button or that the app has transitioned to the background? This is assuming the script was exported to xCode and compiled to a native app. Is there an equivalent to 'applicationWillResignActive' or 'applicationDidEnterBackground'? I'm an experienced iOS developer and would rather use Codea than Objective-C for quick app ideas.

I ask because in my app I would like to save the current data (tables) so the user doesn't have to re-create the data each time they run the app (assuming I've exported the app to xCode). I've looked at serializing the table structures after each change is made, but that's a lot of overhead which I'd rather push to a 'shutdown()' method if possible.

Thanks for any suggestions!

-Brian

Any help is much appreciated! - Mike

After a couple hours I have a reasonably playable version (I will share the code when done), and several problems or doubts about Codea:

I know this has probably been discussed, but I couldn't find it, I've seen the Cargo-Bot game in the App Store, and I was wondering if there is a known process (hopefully simple) to export apps from Codea to the AppStore

Another thing is, Codea is great for games, but it doesn't really have many options to either interact with the user (Form creation for example), the iPad (more os functions) or the Internet. I would love to code some Apps for some of my websites, but right now Codea doesn't really provide the tools for that. Is it possible that the developers will add such features in future releases?

Thanks a lot! Chevi

example = {}
example.pos = {}
example.pos.x = 0
example.pos.y = 0
example.dim = {}
example.dim.w = 10
example.dim.h = 10

tween(2, example, {pos.x=10, dim.w=20})
-- or
tween(2, example, {pos["x"]=10, dim["w"]=20})

I don't really understand for the moment how works shader, but if somebody know how to simulate light (Undirectional light, spot, ...) in 3D scene with mesh and shader, that could be great !

Thanks

I want to be able to connect to a calendar I guess online so that I don't have to edit it every year with where the month starts and all. I would like for the calendar to be in a box form similar to this: http://www.timeanddate.com/calendar/

Then I want to add a notification table I guess or um system to it, so that you can input notifications like: Doctor's Appointment 9:00 am And at whatever time you give it, a notification box will pop up just like the Reminders App and tell you that you have a Doctor's Appointment!

If someone could please help me out with this I'd be grateful as I'm very new to Codea and not sure how I'd do this. If you could point me in the right dorection as far as a tutorial that goes over this or code that is already shared, I'd be thankful!

Speakmore

I am from a vb.net background but have taken quite well with lua simple but effective.

My main question is has anyone got an idiots guide to 3d programming within the codea as it's something I am eager to learn. I am already coding an iso engine for a game with collision detection which I plan on sharing with a full breakdown on the site.

All the best for now Michael maguinness

I have mat3 uniform in my shader. How should I set value for that from lua script?

I can either

(a) use addRect / create two triangles covering the entire image, or

(b) I can create a large set of vectors which accurately map the contours of the tree and omit surrounding blank pixels

So (a) has fewer vertices but (b) has fewer pixels

If the mesh is used to create a pixel map, after which the vertices are disposed of, then I'm guessing (b) is better, because it has fewer pixels. But if the vertices are needed for each redraw, then (a) may put less strain on the processor.

Does anyone know enough about this to give me some advice?

If I want users to add a profile picture etc and the program downloads a picture through http_request and then saves it with saveImage('Documents:someid',img). Will this work even when I deploy on appstore or is it Codea specific storage?

-- revolution example test

-- Use this function to perform your initial setup
function setup()
    --creating the object that will be revolved around
    center = physics.body(CIRCLE, 40)  
        center.x = WIDTH/2
        center.y = HEIGHT/2
        center.type = STATIC

    --creating the revolving object
    asteroid = physics.body(CIRCLE, 40)  
        asteroid.x = 400
        asteroid.y = 200
        force = vec2(math.cos(asteroid.x),math.sin(asteroid.y))   
        asteroid:applyForce(force * 100) -- apply force from center of mass          

        joint = physics.joint(REVOLUTE,center,asteroid,vec2(center.x, center.y))

end

-- This function gets called once every frame
function draw()
    -- This sets a dark background color 
    background(40, 40, 50)

    -- This sets the line thickness
    strokeWidth(5)

    -- Do your drawing here
    ellipse(center.x,center.y, 40)
    sprite("Space Art:Asteroid Small", asteroid.x, asteroid.y)

end

I would like to create an epub reader with Codea. I think for to use Cider libraries for UI.

For the algorithm, you have some reference or source code in Lua from which to start?

thanks

I need it to move from left to right....

If the size of the texture image can be small or large, ie anything, it gets quite complicated figuring out where to put all the vertices, because triangles need to be fitted to the image as well as to the overall shape.

A simpler solution is to create a temporary image the same size as the whole shape, and tile it with the image, then the whole shape fits within this image, and you can define vector triangle sizes as you wish, without any constraints imposed by image size.

My question is - if I do this, and if I destroy the temporary image afterwards, is there likely to be a hit on memory or performance as the result of using a large image, ie does Codea have to keep the image in memory, or does it discard it once the triangles are textured initially?

But knowing how much memory you're using is useful anyway.

Am I allowed to copy/use the same objective/goal/idea and make it my application. I will not be using the same same name or pixels as them, but like I said the same idea.

I contacted them regardless asking if I could make an application off the idea, but I don't think I need the permission.

I was wondering if I could make a program that would run as my background.

It would contain moving objects and when I touched the screen, and action would occur.

I know you make Applications with this stuff, but is there a way I could make something for my background image??

In order for this to work, I need access to Codea's mesh object natively (in Obj-C), since the SpriteBatch class uses a mesh to do it's dirty work; however when I exported my project using the new export feature, I noticed that the Codea runtime's headers and sources are not included in the exported project, just the compiled static library.

Is there any way I can gain access to the native mesh object in Obj-C so that I can access it in my SpriteBatch addon class? Or, would it be possible to do this without direct native access, using the Lua C runtime to gain access to the mesh() object via Lua?

EDIT: nevermind, it looks like the Codea runtime doesn't provide a C API for any of it's internal objects (only a Lua API), so without access to the functionality to mess with a mesh's buffers directly, most of this is impossible (or at least, any workarounds would potentially negate the performance increase, so it's not worth doing at this point :/ )

If there are basically no brick walls to hit, my second question would have to be where to start learning how to make codea work. Thanks ahead for your answers, please keep your answers in as simple form as possible since I have next to no programming experience.(I did try learning obj-c once though)

Forgive me for any errors in this thread, or if I basically asked the same question as somebody else, please correct me if I do so.

Thanks,DTK

I have class where in function SmallCloud:init I initializing self.id. Here variable works, also in SmallCloud:draw() function. But when I call SmallCloud:update function, here have variable self.id a nil value. Why?

Code:

SmallCloud = class()

function SmallCloud:init(id,x,y,strana,pocet,ciel,rychlost)
    self.id=id
    self.x=x
    self.y=y
    self.strana=strana
    self.pocet=pocet
    self.ciel=ciel
    self.rychlost=rychlost
end

function SmallCloud:draw()
    pushStyle()
    if self.strana==1 then
        sprite("Dropbox:modry",self.x,self.y,40+self.pocet)
        fill(0,173,238,255)
    elseif self.strana==2 then
        sprite("Dropbox:red",self.x,self.y,40+self.pocet)
        fill(191,33,46)
    elseif self.strana==3 then
        sprite("Dropbox:orange",self.x,self.y,40+self.pocet)
        fill(255,156,43)
    end
    font("SourceSansPro-Regular")
    fontSize(25)
    --text(self.pocet,self.x,self.y)
    text(self.id,self.x,self.y)
    popStyle()
end


function SmallCloud:update()
    print(self.id)
end

/////////////////////////////////////////////////////////
// Alpha Threshold effect

precision highp float;

uniform lowp sampler2D samplerFront;

uniform float threshold;
uniform float smoothness;
uniform float unpremultiply;

varying vec2 vTex;

void main()
{
    lowp vec4 color = texture2D( samplerFront, vTex ) ;
    if( unpremultiply > 0.0 ) { color.rgb /= color.a ; }
        
    float range = ( color.a - (1.0 - threshold) - (smoothness * 0.05) ) / (0.0001 + smoothness * 0.1) ;
    color.a = smoothstep( 0.0, 1.0, range ) ;
    color.rgb *= color.a ;
        
    gl_FragColor = color ;
}

Water.shader=shader("Effects:Ripple")

When I try to compile this, it works, but when I run it, I get the error:

Bad argument #1 to 'shader' (Shader not found)

In my xcode project, the Resources/ShaderPacks has an Effects.shaderpack with Ripple.shader, and 3 files.

Why would this fail?

Here is the code from the tutorial that I need in my program:

function setup()
    x = WIDTH/2
    y = HEIGHT/2
    bc = color(248, 250, 13, 255)
    tc = color(195, 17, 17, 255)
    c = bc
    inTouch = false
    dx = 0
    dy = 0
    r = 30
end

function draw()
    background(0, 0, 0, 255)
    fill(c)
    ellipse(x,y,r)
    if inTouch then
        x = tx
        y = ty
        c = tc
    else
        x = x +  dx
        y = y +  dy
        c = bc
    end
    if y > HEIGHT - r then
        dy = - dy
    end
    if y < r then
        dy = - dy
    end
    if x > WIDTH - r then
        dx = - dx
    end
    if x < r then
        dx = - dx
    end
end

function touched(touch)
    tx = touch.x
    ty = touch.y
    if touch.state == BEGAN then
        inTouch = true
        velocity = {}
    end
    if touch.state == MOVING then
        table.insert(velocity,1,vec2(touch.deltaX,touch.deltaY))
    end
    if touch.state == ENDED then
        dx = 0
        dy = 0
        n = 0
        for i = 1,10 do
            if velocity[i] then
                n = n + 1
            dx = dx + velocity[i].x
            dy = dy + velocity[i].y
            end
        end
        if n >0 then
        dx = dx / n
        dy = dy / n
        end
        inTouch = false
    end
end

Ball = class()

function Ball:init(x)
    -- you can accept and set parameters here
    self.xpos = WIDTH / 2
    self.ypos = HEIGHT / 2
    self.colourred = 0
    self.colourblue = 255
    self.colourgreen = 255
    self.colour = color(colourred, colourblue, colourgreen)
    self.ballsize = 25
end

function Ball.draw()
    stroke(Ball.colour)
    fill(Ball.colour)
    rect( xpos, ypos, ballsize, ballsize)
end

function Ball:touched(touch)
    -- Codea does not automatically call this method

    end 

And yes, I probably should use a vector, I just haven't gotten around to it.

function setup()
    bullet = physics.body(CIRCLE,10)
end

function draw()
    background(0, 0, 0, 255)
    pushStyle()
    fill(255, 255, 255, 255)
    ellipse(bullet.x,bullet.y,10)
    popStyle()
end

function createBullet()
    bullet.x = x
    bullet.y = y
    bullet.linearVelocity = vec2(1000,0)
    bullet.restitution = 0
    bullet.type = DYNAMIC
end

function touched(touch)
    x = touch.x
    y = touch.y
    if touch.state == BEGAN then
        createBullet()
    end
end

I've always wanted to do this... Anyway, let me get on with my question:

For people making their own games, did you or even do you have to create your own graphics for every level and all? Just looking for a quicker way, because I don't want to have to make 50+ level graphics when I'm not even that efficient with creating graphics to begin with.

Second question has been pretty much answered

Thanks, Speakmore

Is the pointinginrect slowing me down?

Button = class()

-- Fast Mesh Button Class courtesy of @Vega
-- 3 Aug 2012
--
-- Modified: - Call Back Functionality added
--           - pushStyle() & popStyle() added to draw()
--           - tapped status added
--           - pointInRect() function added
--           - changed vec2 location to x and y (to reduce typing!)
--
-- Version 1.3 (4 Aug 2012)

function Button:init(text,x,y,width,height)
    self.state = "normal"
    self.text = text
    self.textColor = color(255,255,255,192)
    self.x = x
    self.y = y
    self.width = width
    self.height = height
    self.visible = true
    self.fontSize = 28
    self.font = "ArialRoundedMTBold"
    self.color1 = color(255, 255, 255, 96)
    self.color2 = color(128,128,128,32)
    self.presscolor1 = color(192, 224, 224, 128)
    self.presscolor2 = color(96, 192, 224, 128)
    self.verts = self:createVerts(self.width, self.height)
    self.myMesh = mesh()
    self.myMesh.vertices = triangulate(self.verts)
    self.vertColor = {}
    self:recolor()
    self.action = nil
    self.tapped = false
    self.actionpress= false
    self.istouched = false
end

function Button:setColors(c1,c2,p1,p2)
    self.color1 = c1
    self.color2 = c2
    self.presscolor1 = p1
    self.presscolor2 = p2
    self:recolor()
end

function Button:textOptions(fn, sz, col)
    self.font = fn
    self.fontSize = sz
    self.textColor = col
end

function Button:draw()
    if self.visible == true then
        pushStyle()
        pushMatrix()
        translate(self.x,self.y)
        self.myMesh:draw()
        fill(self.textColor)
        fontSize(self.fontSize)
        font(self.font)
        text(self.text, self.width/2,self.height/2)
        self:drawLines(self.verts)
        popMatrix()
        popStyle()
        if self.istouched then
            if self.actionpress then
                if self.action then
                    self.action()
                end
            end
        end
    end
end

function Button:touched(touch)
    self.tapped = false
    if self.visible then  
        if pointInRect(touch.x, touch.y, self.x, self.y, self.width, self.height) then
            if touch.state == BEGAN then
                self.tapped = true
                self.state = "pressing"
                self:recolor()
                self.istouched = true

            elseif touch.state == ENDED then
                if self.state == "pressing" then
                    self.state = "normal"
                    self.tapped = true
                    self:recolor()

                end
                if self.actionpress == false then
                    if self.action then
                        self.action()
                        actiontook = true
                    end
                end
                self.istouched = false
            end
        else
            self.state = "normal"
            self:recolor()
        end

    end
    if touch.state == ENDED then
        self.istouched = false
    end

end

function Button:createVerts(w,h)
    local r
    local v = {}
    if w > 100 or h > 100 then
        if w>=h then r = math.round(h/100) else r = math.round(w/100) end
    else
        r = 1
    end
    v[1] = vec2(w,6*r)
    v[2] = vec2(w-r,4*r)
    v[3] = vec2(w-2*r,2*r)
    v[4] = vec2(w-4*r,r)
    v[5] = vec2(w-6*r,0)
    v[6] = vec2(6*r,0)
    v[7] = vec2(4*r,r)
    v[8] = vec2(2*r,2*r)
    v[9] = vec2(r,4*r)
    v[10] = vec2(0,6*r)
    v[11] = vec2(0,h-6*r)
    v[12] = vec2(r,h-4*r)
    v[13] = vec2(2*r,h-2*r)
    v[14] = vec2(4*r,h-r)
    v[15] = vec2(6*r,h)
    v[16] = vec2(w-6*r,h)
    v[17] = vec2(w-4*r,h-r)
    v[18] = vec2(w-2*r,h-2*r)
    v[19] = vec2(w-r,h-4*r)
    v[20] = vec2(w,h-6*r)
    return v
end

function Button:drawLines(v)
    noSmooth()
    strokeWidth(1)
    stroke(0, 0, 0, 192)
    for i=1, #v-1 do
        line(v[i].x,v[i].y,v[i+1].x,v[i+1].y)
    end
    line(v[#v].x,v[#v].y,v[1].x,v[1].y)   
end

function Button:recolor()
    local lt, dk
    if self.state == "normal" then 
        lt = self.color1
        dk = self.color2
    else
        lt = self.presscolor1
        dk = self.presscolor2
    end
    for i=1,3 * #self.verts - 6 do
        if self.myMesh.vertices[i].y > self.height/2 then
            self.vertColor[i] = lt
        else
            self.vertColor[i] = dk
        end
    end
    self.myMesh.colors = self.vertColor
end

-- Math Utilities

function math.round(value)   
    -- math.round function courtesy of Vega.   
    return math.floor(value + 0.5)

end

function pointInRect(pointX, pointY, x, y, w, h)

    -- Returns true if point (pointX, pointY) is within the rectangle
    -- with lower left corner at (x, y) with a width of w and a
    -- height of h.
    --
    -- Reefwing Software (www.reefwing.com.au)
    -- Version 1.0

    if pointX >= x and pointX <= x + w and pointY >= y and pointY <= y + h then
        return true
    else
        return false
    end

end

tile = class()
function tile:init(x,y)

 self = {}

self.x = x;

self.y = y;

self.WIDTH = 128

self.HEIGHT = 128

self.draw = tile:draw()

return self

end


function tile:draw()
rect(self.x-self.WIDTH/2, self.y-self.HEIGHT/2, self.WIDTH, self.HEIGHT
end


-- then, outside...

for k = 1, 6 do
    table.insert(self.table, tile:init(12,12))
end

for i, v in ipairs(table) do
    tile:draw()
end

on self.x-self.WIDTH the highlighting disappears... does this mean I'm not allowed to modify those variables?

I just can't figure this out...

For my part, I'd like to know this so that, if using the onscreen keyboard, I can shift my typing area into view if needed, but if using a hardware keyboard, I wouldn't need to do anything.

UIKit has a nice feature where you can set a callback, and whenever the keyboard is displayed/hidden, it calls that callback with information about how the keyboard is going to be displayed: it's ending frame size, the animation curve used to show/hide the display, and some other stuff I can't remember. This is awesome because you can synchronize your view's animation with the on screen keyboard if necessary.

If there current is no functionality to detect hw/sw keyboard, I propose that the callback feature be added to the feature tracker. If there is, please point me to it so I can use it :)

I am new to Codea (and coding in general) and have found this site to be extremely useful. I've used this site to learn how to draw meshes and how to call functions, but I'm a bit stuck when it comes to combining the two techniques. I'm sure it's something really simple that I am doing incorrectly.

Problem: I can draw meshes just fine when I include them in "Main", but I cannot get my meshes to draw when I try to call it as a function.

Thank you all for your help.

function setup()

triangle = meshTest()

--triangle = mesh()
--triangle.vertices = {vec2(0,0),vec2(100,0),vec2(0,100)}

end


function draw()

    background(40, 40, 50)
    strokeWidth(5)
    triangle:draw()

end

-- The code below is on a different tab  -- 

meshTest = class()

function meshTest:init()

self.mesh = mesh()
self.vertices = {vec2(0,0),vec2(100,0),vec2(0,100)}

end

function meshTest:draw()

self.mesh:draw()

end

For k,v inpairs(table) Blah End

Figured out how to use it basics, but can someone help me to figure out how to assign a variable to ( table ) so I can use the same routine without having to write separate code.

Thanks