ERROR - function arguments expected near '='

General
1

I’m fairly new to Codea and Lua, so this might be something that’s easy to fix, but I’ve looked around for an answer and I can’t find one. I have written the following code:

for k,touch in pairs(touches) do
        if Point(touch.x, touch.y).inside(Rect(0, 0, 110, 100)) then
            if #enemies ~= 0 then
                closest = {enemies[1].center().distance(Point(player.x, player.y)), enemies[0]}
                for enemy in enemies do
                    if enemy.center().distance(player.center()) < closest[1]:
                    c = enemy.center() --error on this line: function arguments expected near '='
                    d = c.distance(Point(player.x, player.y))
                    closest = {d, enemy}
                    end
                end
                lightning(closest[1].center().x, closest[1].center().y, player.x+player.w/2, player.y+player.h/2)
                closest[1].health = closest[1].health - 10
            end
        end
    end

Point, Rect, and everything in the table “enemies” are classes I’ve made. In the table “enemies”, all items are instances of the class Enemy, which has a method called center, which takes no arguments, and returns a Point class. The Point class has a method called distance, which takes another Point as the only argument. I don’t understand why this doesn’t work.

Note: This script was previously written in python. I’m trying to translate the program over into Codea. This section of the program had no problem running the way I had it set up in Python, so I think it must be some syntax specific to Lua, maybe? Again, I’m not very experienced.

2

Use ==

A single = is used to set the value of a variable, two = is used to test equality

3

oh god! I didn’t notice that all my code was on one line! I’ve fixed that now, and actually I’m trying to assign the variable c with the value that the center function returns, which is a Point class.

4

for enemy in enemies do isn’t correct syntax. Could be causing the error a few lines after

5

if i change it to

for i, enemy in enemies do

is that correct syntax? The same error still happens

6

Nope. Are you trying to iterate through an array called enemies? Use pairs or ipairs, same as you’re doing for the touches table

7

Also, you have the incorrect syntax for an if statement: in Lua, it’s if x < y then ... end, you have it written as if x < y: ... end

8

Also, center().distance is wrong. You can’t have dot notation after a method call. What are you trying to do here? I think we need to see more code

9

@yojimbo2000 You can have a dot notation after a method call if the function returns something, but again, we can’t fix all the errors without seeing all the code. @DarthXander is there any way you could post the whole code? Lua is very different from Python and you would probably need to re-code it to get it right.

10

thanks for all your help =) and yes, here’s the whole code:


--# Main
function setup()
    for a = 1, #leveldict do
        keys = {"walls", "portal", "spikes"}
        for b, key in keys do
            for i = 1, #leveldict[a][key] do
                leveldict[a][key][i].y = leveldict[a][key][i].y + 100
            end
            leveldict[a]["spawn"][2] = leveldict[a]["spawn"][2] + 100
        end
    end
    leveldict = {beginning}
    level = 1
    enemies = {}
    animation = 3.0
    table.insert(enemies, Enemy(500, 500))
    peach = nil
    peach2 = nil
    max_speed = 7
    max_jump = 11
    touchy = false
    player = Rect(20, 620, 50, 90)
    move = {0, 0}
    reference = nil
    sprite = peach
    skiptime = true
    blood = {}
    touches = {}
    beginning = {["spawn"] = {20, 620},
           ["walls"] = {Rect(0, 500, 700, 20), Rect(700+player.w+10, 500, 600, 20), Rect(680, -100, 20, 600),               Rect(700+player.w+10, -100, 20, 600)},
           ["portal"] = {Rect(680, 0, 100, 1)},
           ["spikes"] = {},
           ["text"] = ""}
end
function draw()
    background(54, 54, 54, 255)
    fill(255, 255, 255, 255)
    for i = 1, #enemies do
        enemies[i]:update()
    end
    for i = 1, #leveldict[level]['walls'] do
        rect(leveldict[level]['walls'][i].x, leveldict[level]['walls'][i].y, leveldict[level]['walls'][i].w, leveldict[level]['walls'][i].h)
    end
    for i = 1, #leveldict[level]['spikes'] do
        spikey(leveldict[level]['spikes'][i])
    end
		fill(1.0, 0.141, 0.173)
--rect(900, 700, 50, 50)
		fill(0.217, 0.725, 0.276)
		tint(255, 255, 255, 255)
    if move[1] < 0 then
        scale(-1, 1)
        sprite("Documents:peach", player.x+player.w, player.y, player.w, player.h)
        scale(-1, 1)
    end
    if move >= 0 then
        sprite("Documents:peach", player.x, player.y, player.w, player.h)
    end
    if player.intersects(leveldict[level]['portal'][1]) then
        level = level + 1
        if level > #leveldict then
            level = 1
        end
        player.x, player.y = leveldict[level]['spawn'][0], leveldict[level]['spawn'][1]
        animation = 3.0
    end
    for i = 1, #leveldict[level]['spikes'] do
        if player.intersects(leveldict[level]['spikes'][i]) then
            for a = 0, 20 do
                table.insert(Drop(player.x+player.w/2, player.y))
            end
            for i = 1, #enemies do
                if enemies[i] == self then
                    table.remove(enemies, i)
                end
            end
        end
    end
    for i = 1, #leveldict[level]['walls'] do
        if Rect(player.x+move[1], player.y+.5, player.w, player.h-.5).intersects(leveldict[level]['walls'][i]) then
            if player.x < wall.x then
                player.x = wall.x-player.w-.5
                player.x = wall.x + wall.w+.5
            else
                move[1] = 0
            end
        end
        if Rect(player.x, player.y+move[2], player.w, player.h).intersects(leveldict[level]['walls'][i]) then
            if player.y < leveldict[level]['walls'][i].y then
                player.y = leveldict[level]['walls'][i].y-player.h-.5
            else
                player.y = leveldict[level]['walls'][i].y + leveldict[level]['walls'][i].h
                move[2] = 0
            end
        end
    end
    player.y = player.y + move[1]
    player.x = player.x + move[2]
    if player.y+player.h > HEIGHT then
        move[2] = 0
    end
    player.x = math.min(WIDTH - player.w, math.max(0, player.x))
    player.y = math.min(HEIGHT+20 - player.h, math.max(0, player.y))
    move[2] = math.max(move[2] - .5, -20)
    fill(0, 255, 0, math.max(math.min(255, animation), 0))
    animation = animation - 1
    fontSize(50)
    text(leveldict[level]['text'], 512, 384) --size 50
    a = 288
    fill(0,0,0)
    rect(0,0,1024,100)
    strokeWidth(1)
    stroke(129, 0, 255, 255)
    for x = 500+a, 550+a do
        line(x, (x-500-a)*(40.0/50)+50, x, -(x-500-a)*(40.0/50)+50)
    end
    for x = 650+a, 700+a do
        line(x, (x-700-a)*(40.0/50)+50, x, -(x-700-a)*(40.0/50)+50)
    end
    for x = 10, 90 do
        line(-(x-10)*(40.0/80)+150, 100-x, (x-10)*(40.0/80)+150, 100-x)
    end
    strokeWidth(3)
    ellipse(10, 10, 80, 80)
    line(5, 50, 20, 50)
    line(80, 50, 95, 50)
    line(50, 5, 50, 20)
    line(50, 80, 50, 95)
    fill(128, 0, 255, 255)
    fontSize(30)
    text("skip", 500, 50) -- size 30
    strokeWidth(0)
    for k,touch in pairs(touches) do
        if Point(touch.x, touch.y).inside(Rect(780, 0, 100, 100)) then
            move[1] = -max_speed
        end
        if Point(touch.x, touch.y).inside(Rect(900, 0, 100, 100)) then
            move[1] = max_speed
        end
        if Point(touch.x, touch.y).inside(Rect(110, 0, 190, 100)) then
            for wall in leveldict[level]['walls'] do
                if player.y == wall.y+wall.h and (player.x + player.w > wall.x and player.x < wall.x+wall.w) then
                    move[1] = max_jump
                end
            end
        end
       --[[
        if Point(touch.x, touch.y):inside(Rect(0, 0, 110, 100)) then
            if #enemies ~= 0 then
                closest = {enemies[1]:center():distance(Point(player.x, player.y)), enemies[1]}
                for i, enemy in pairs(enemies) do
                    if enemy:center():distance(player:center()) < closest[0] then
                    c = enemy:center()
                    d = c:distance(Point(player.x, player.y))
                    closest = {d, enemy}
                    end
                end
                lightning(closest[1].center().x, closest[1].center().y, player.x+player.w/2, player.y+player.h/2)
                closest[1].health = closest[1].health - 10
            end
        end
        --]]
        if Point(touch.x, touch.y).distance(Point(500, 50)) < 40 then
            if skiptime == true then
                level = level + 1
                if level > #leveldict then
                    level = 0
                end
                player.x, player.y = leveldict[level]['spawn'][1], leveldict[level]['spawn'][2]
                animation = 3.0
                skiptime = False
            end
        end
        if touch.y > 100 then
            lightning(touch.location.x, touch.location.y, player.x+player.w/2, player.y+player.h/2)
        end
    end
    for i, drop in blood do
        drop.x = drop.x + drop.vx
        drop.y = drop.y + drop.vy
        drop.vy = drop.vy - drop.g
        drop.color[3] = math.max(drop.color[3] - .02, 0)
        fill(unpack(drop.color))
        ellipse(drop.x, drop.y, drop.w, drop.h)
        table.remove(drop, i)
    end
end
			
function touched(touch)
    if touch.state == ENDED then
        touches[touch.id] = nil
        skiptime = True
		move[1] = 0
    elseif touch.state == BEGAN then
        if touch.y > 100 then
			table.insert(enemies, Enemy(touch.x, touch.y))
        end
        touches[touch.id] = touch
    else
        touches[touch.id] = touch
        end
end
11

actually that’s just the Main tab, the rest won’t fit… and I think I’ve implemented your fixes

12

You know what? It was the if…then thing that I forgot to fix from when it was in python. Thanks for all your help!!! By the way, going back and looking at the code now, there’s a lot of things that need fixing; my code here is a huge mess. I’ll try and fix all of it and see if I still have any problems.