Add a new body (physics) during an event?

Getting Started Newbie Questions
#1

Hi,

this is to further explain this thread:

http://forums.coronalabs.com/topic/37529-swap-an-image/

How do I add a physics body during an event?

When a ball hits a brick the image is being remove (to be able to create a new image) and I want that new image to also have a body.

So in a “collision” event I run this:

if event.other.value == 2 then

                print(“Value 2!”)

                local j = event.other.j

                local i = event.other.i

                local x = event.other.x

                local y = event.other.y

                

                event.other:removeSelf()

                event.other = nil

                

                brickImageTable[j][i] = display.newImage(imageSheet, 4, x, y)

                brickImageTable[j][i].value = 1

                brickImageTable[j][i].name = “brick”

                

                physics.addBody(brickImageTable[j][i], “static”, {density = 1, friction = 0, bounce = 0})

            else

                event.other:removeSelf()

                event.other = nil

                bricks.numChildren = bricks.numChildren - 1

            end

But I get this error:

ERROR: physics.addBody() cannot be called when the world is locked and in the mi

ddle of number crunching, such as during a collision event.

Is it possible, someway, to create a physics body within an event?

Thanks in advance,

Best regards,

Tomas

#2

Can you add the block then add physics to it at a latter time
Or if physics is only used for collision with the blocks then don’t use physics and use your on collision detection
Just some more suggestions

#3

Hi,

I want a body so that it detects collisions, right?

I can of course make some detection, from the ball, to see if it is within any range of the bricks but it can be quite a lot of bricks so that sounds more consuming than having a body?

Correct me if I’m wrong here jstrahan

#4

What if you created the second block at se time as first but have if off screen on invisible and it show after first is destroyed

#5

That’s genius! I will try that, thanks a lot!

#6

Thanks, that worked!

Note: It didn’t work to change the X and Y value on the image so I did a transition.to:

Error message:

ERROR: Cannot translate an object before collision is resolved.

My “new” image to a stored X and Y value

transition.to(brickImageSecondTable[j][i], {x =x, y = y, time = 0})

Thanks!

Best regards,

Tomas

#7

welcome

#8

i dont normally do physics so maybe someone else may have a better solution

#9

and heres an example of doing the collision without physics in a breakout game

#10

Can you add the block then add physics to it at a latter time
Or if physics is only used for collision with the blocks then don’t use physics and use your on collision detection
Just some more suggestions

#11

Hi,

I want a body so that it detects collisions, right?

I can of course make some detection, from the ball, to see if it is within any range of the bricks but it can be quite a lot of bricks so that sounds more consuming than having a body?

Correct me if I’m wrong here jstrahan

#12

What if you created the second block at se time as first but have if off screen on invisible and it show after first is destroyed

#13

That’s genius! I will try that, thanks a lot!

#14

Thanks, that worked!

Note: It didn’t work to change the X and Y value on the image so I did a transition.to:

Error message:

ERROR: Cannot translate an object before collision is resolved.

My “new” image to a stored X and Y value

transition.to(brickImageSecondTable[j][i], {x =x, y = y, time = 0})

Thanks!

Best regards,

Tomas

#15

welcome

#16

i dont normally do physics so maybe someone else may have a better solution

#17

and heres an example of doing the collision without physics in a breakout game