Physics 2D not destroying bodies

Bugs
1

I have this code in setup():


    print(#physics.bodies)
    testbody = physics.body(CIRCLE, 90)
    print(#physics.bodies)
    testbody:destroy()
    testbody = nil
    print(#physics.bodies)

According to the documentation, this should print out:


    0
    1
    0

Actual print out is in attached screenshot.

Project also attached.

2

You need to give it a draw cycle to destroy the body. Other code needs to execute. That goes for just about anything.

3

@UberGoober Try this code. Tap the screen to create and destroy the body.

function setup()
    c=0
    fill(255)
    str="no physics bodies exist"
end

function draw()
    background(40, 40, 50)
    text("tap screen",WIDTH/2,HEIGHT/2+100)
    text("physics bodies  "..#physics.bodies,WIDTH/2,HEIGHT/2)
    text(str,WIDTH/2,HEIGHT/2-100)
end

function touched(t)
    if t.state==BEGAN then
        c=c+1
        if c==1 then
            testbody = physics.body(CIRCLE, 90)
            str="physics body created"
        elseif c==2 then
            testbody:destroy()
            str="physics body destroyed"
        elseif c==3 then
            testbody = nil
        end
    end
end
4

@dave1707 OMG thank you so much. This is a vital thing to know and I’ve honestly been banging my head against it for a looooong time.

I slightly adjusted the code so that it repeatedly creates and destroys bodies:


function setup()
    c=0
    fill(255)
    str="no physics bodies exist"
end

function draw()
    background(40, 40, 50)
    text("tap screen",WIDTH/2,HEIGHT/2+100)
    text("physics bodies  "..#physics.bodies,WIDTH/2,HEIGHT/2)
    text(str,WIDTH/2,HEIGHT/2-100)
end

function touched(t)
    if t.state==BEGAN then
        c=c+1
        if c % 2 == 1 then
            testbody = physics.body(CIRCLE, 90)
            str="physics body created"
        elseif c % 2 == 0 then
            testbody:destroy()
            str="physics body destroyed"
        end
    end
end
5

@UberGoober Some things don’t happen instantly. You have to let Codea go thru a code cycle so it can execute any background code that needs to be done.