how can i make a class be an object?

for example:

function setup()
     object1 = object:init(213,45)
     object2 = object:init(89,349)

function draw()

with return? but how? and do i have to change the draw function if i get the classes be objects(variables)?
i just have no idea…

lg maxiking

I’m not quite sure what you’re trying to do here. Is there a reason you’re not calling an instance, like object1:draw()? Are you trying to create some kind of generic wrapper class ala EJB or java persistence API?

omg no i dont even know what this is :smiley: i just want one class, ang make objects out of it, and which i can call seperately.

Oh, in that case, I think you just have the syntax backwards. In your draw routine, call object1:draw() or object2:draw() rather than object:draw().

Also I’d recommend creating your objects as follows:

function setup()
    object1 = object(213,45)
    object2 = object(89,349)

The init() method is called implicitly when you create the object.

@Maxiking16 Example:

This is a class, with some methods and properties:

Ball = class()

function Ball:init(x, y, size)
  self.x = x
  self.y = y
  self.size = size

function Ball:draw()
  ellipse(self.x, self.y, self.size, self.size)

function Ball.bounce()
  -- just an example method, this doesn't actually do anything useful
  self.y = self.y + 50

And this is how I would then use that class in my main file:

function setup()
  myBall = Ball(50, 50, 100)  -- create a new Ball called 'myBall', at position 50, 50 and with size 100
  anotherBall = Ball(100, 100, 75)  -- create another Ball called 'anotherBall'

function draw()
  myBall:draw()  -- draw each ball

function touched(touch)
  myBall:bounce()  -- if the user touches the screen, bounce myBall

Does that help at all?

Wow @Simeon and @frosty , this Works. Thank you! BTW, @Simeon , the New Update is Really awesome. Bought both the Backgrounds and the Editor theme to help you developing!

@frosty - thanks for that example - very helpful!
When I wrote my comp entry used no classes and just very basic functions and lots of nested “if” statements - but I knew classes would have made it much easier but was at a loss as to how to use them. This example has shown me how to define the class and create objects from it - many thanks! :slight_smile: now to have a go…

One question for you guys: I guess I could store numerous balls and their respective data in a table and then draw them by cycling through the table with the ipairs function?
If so, how do I store numerous attributes in the table specific to each ball e.g. Ball 1, xpos, ypos, size? And if I had a table which I add data to through the program, how do I use the table.insert function to add the above attributes to the table? (I’ve used it to add a single value, but not multiple values related to a particular object e.g ball 1).
Hope this post makes sense?! Thanks :slight_smile:

Store the objects in a table and make the attributes properties of the object.

balls[1].xpos = 100

@Badger You can simply create multiple ball objects, and store them all in a table. Because the balls are objects, they all take care of storing their own attributes. So, if you had a Ball class, like in my earlier post, you could do something like:

function setup()
  local ball1 = Ball(50, 50, 100)  -- create 3 balls
  local ball2 = Ball(300, 300, 100)
  local ball3 = Ball(550, 450, 100)

  balls = { ball1, ball2, ball3 }  -- create a new table containing them

  watch("return #balls") -- display the number of balls in the Balls table

function draw()
  background(41, 41, 41, 255)

  for index, ball in ipairs(balls) do
    ball.y = ball.y + 1
    -- check if the ball goes offscreen
    if ball.y > HEIGHT + (ball.size/2) then
        table.remove(balls, index)  -- remove the ball at the current index

function touched(touch)
  if touch.state == BEGAN then
    -- if the user touches the screen, add a new ball at the touch position
    table.insert(balls, Ball(touch.x, touch.y, 100))

I should maybe point out that in the draw() method there, ‘ball’ is different to ‘Ball’ (notice the capital). ‘Ball’ is the Ball class, and is used to create new objects. In the draw method, ‘ball’ is a specific ball object - as we loop through each item in the balls table, ‘ball’ refers to each one in turn.

I’m not sure if I’ve just made that more complicated…

Thanks @frosty I’ll give it a go and see if it sinks into my grey matter - ta