Corona Simulator crashes. Problem with objectCount and physics.

Getting Started Newbie Questions
#1

Only been doing this a few months.

I am trying to display 8 different objects to create a room, all using the same png file.

I tried displaying normally:

    (local platform2

          platform2 = display.newImageRect( “platform.png”, 700, 20)

          platform2.x = display.contentHeight - 100

          platform2.y = display.contentHeight - 10

          physics.addBody( platform2, “static”)

and it worked fine for all 8.

but I am trying to condense this, as doing that for each one seems to long.

So I tried the following and it crashes every time I try to save.

Thus it will not display anything.

It can take the first 2 or 3 platforms but than it crashes

I am probably doing this the hard way.

Thank you for any assistance.

      local platform = {}

           local objectCount = 8

     – Platform hovering on the right

           for i = 1, objectCount do

              platform[i] = display.newImageRect(“platform.png”, 100, 20)

              platform[1].x = 330

              platform[1].y = 160

     --Platform hovering on the left

           for i = 2, objectCount do

              platform[i] = display.newImageRect(“platform.png”, 100, 20)

              platform[2].x = 140

              platform[2].y = 160

     --Platform on the top(Ceiling)

           for i = 3, objectCount do

              platform[i] = display.newImageRect(“platform.png”, 600, 20)

              platform[3].x = 250

              platform[3].y = 0

     --Right Wall

            for i = 4, objectCount do

              platform[i] = display.newImageRect(“platform.png”, 320, 20)

              platform[4].x = 520

              platform[4].y = 160

              platform[4].rotation = 90

       --Left Wall 

             for i = 5, objectCount do

                platform[i] = display.newImageRect(“platform.png”, 100, 20)

                platform[5].x = -40

                platform[5].y = 50

        --Tilted platform on the left

             for i = 6, objectCount do

                platform[i] = display.newImageRect(“platform.png”, 200, 20)

                platform[6].x = 30

                platform[6].y = 250

                platform[6].rotation = 35

        --Tilted platform on the right

             for i = 7, objectCount do

                platform[i] = display.newImageRect(“platform.png”, 200, 20)

                platform[7].x = 450

                platform[7].y = 250

                platform[7].rotation = -35

        --Platform hovering on the bottom(Floor)

             for i = 8, objectCount do

                platform[i] = display.newImageRect(“platform.png”, 700, 20)

                platform[8].x = -100

                platform[8].y = -10

      physics.addBody(platform[1], “static”)

      physics.addBody(platform[2], “static”)

      physics.addBody(platform[3], “static”)

      physics.addBody(platform[4], “static”)

      physics.addBody(platform[5], “static”)

      physics.addBody(platform[6], “static”)

      physics.addBody(platform[7], “static”)

      physics.addBody(platform[8], “static”)

end

end

end

end

end

end

end

end

#2

It seems you have nested loops. In each loop you have the same variable i. Why you don’t try like that

local coords = { {330, 160}, ... } local sizes = { {100, 20}, ... } local w, h, x, y  local platform = {} local objectCount = 8 for i = 1, objectCount do               x = coords[i][1]               y = coords[i][2]               w = sizes[i][1]               h = sizes[i][2]                               platform[i] = display.newImageRect("platform.png", w, h)               platform[i].x, platform[1].y = x ,y               physics.addBody(platform[i], "static") end

           

  

#3

Thank you very much ldurniat

I have been trying it as you suggest but it is unfamiliar to me and says “attempt to index ‘?’(a number value)”

at line 141.

local coords = { {330, 160}, 140, 160}

local sizes = { {100,20}, 100, 120}

local w, h, x, y

local platform = {}

local objectCount = 2

for i = 1, objectCount do 

           x = coords[i][1]  ---------------this is line 141

           y = coords[i][2]

           w = sizes[i][1]

           h = sizes[i][2]

           platform[i] = display.newImageRect(“platform.png”, w,h)

           platform[i].x, platform[1].y = x, y

           physics.addBody(platform[i], “static”)

end

#4

In my code coords  and sizes are tables which elements are also tables. So they need to be rewrite as follow

local coords = { {330, 160}, {140, 160} } local sizes = { {100,20}, {100, 120} }

It should work now. You can read more about tables on Corona documentation.

#5

Yes it works now. Awesome. I will read up on tables. Thank you for the help.

#6

It seems you have nested loops. In each loop you have the same variable i. Why you don’t try like that

local coords = { {330, 160}, ... } local sizes = { {100, 20}, ... } local w, h, x, y  local platform = {} local objectCount = 8 for i = 1, objectCount do               x = coords[i][1]               y = coords[i][2]               w = sizes[i][1]               h = sizes[i][2]                               platform[i] = display.newImageRect("platform.png", w, h)               platform[i].x, platform[1].y = x ,y               physics.addBody(platform[i], "static") end

           

  

#7

Thank you very much ldurniat

I have been trying it as you suggest but it is unfamiliar to me and says “attempt to index ‘?’(a number value)”

at line 141.

local coords = { {330, 160}, 140, 160}

local sizes = { {100,20}, 100, 120}

local w, h, x, y

local platform = {}

local objectCount = 2

for i = 1, objectCount do 

           x = coords[i][1]  ---------------this is line 141

           y = coords[i][2]

           w = sizes[i][1]

           h = sizes[i][2]

           platform[i] = display.newImageRect(“platform.png”, w,h)

           platform[i].x, platform[1].y = x, y

           physics.addBody(platform[i], “static”)

end

#8

In my code coords  and sizes are tables which elements are also tables. So they need to be rewrite as follow

local coords = { {330, 160}, {140, 160} } local sizes = { {100,20}, {100, 120} }

It should work now. You can read more about tables on Corona documentation.

#9

Yes it works now. Awesome. I will read up on tables. Thank you for the help.