Physics Problem - Solved :)

Ninjadoodle · November 2017

Hi guys

I'm trying to get the hang off physics in Gideros and I'm using debug mode.

Everything setups correctly and the physics shapes work the way they are supposed to, but I can't get the images to update/stick to their physics bodies. They are created in the correct place, but not updated.

This is my EnterFrame ...

function Stage09:onEnterFrame()
 
    self.world:step(1/60, 8, 3)
 
    for i = 1, self.ph:getNumChildren() do
 
        local sprite = self.ph:getChildAt(i)
 
        if sprite.body then
 
            local body = sprite.body
            local bodyX, bodyY = body:getPosition()
            sprite:setPosition(bodyX, bodyY)
            sprite:setRotation(body:getAngle() * 180 / math.pi)
 
        end
    end
end

here is one of my objects ...

S09Ball = Core.class(Sprite)
 
function S09Ball:init(x, y, wrld, atlas, container)
 
    self.sprite = Bitmap.new(atlas:getTextureRegion("s05Debris.png"))
    self.sprite:setAnchorPoint(0.5, 0.5)
	self.sprite:setPosition(x, y)
    self:addChild(self.sprite)
	container:addChild(self)
 
	local radius = self.sprite:getWidth() / 2
 
	local body = wrld:createBody{type = b2.DYNAMIC_BODY}
    body:setPosition(self.sprite:getX(), self.sprite:getY())
    body:setAngle(self.sprite:getRotation() * math.pi / 180)
 
    local circle = b2.CircleShape.new(0, 0, radius)
    local fixture = body:createFixture{shape = circle, density = 1.0, friction = 0.1, restitution = 0.2}
 
    self.sprite.body = body
    self.sprite.body.type = "ball"
 
end

and here is how I add it ...

self.onTouch = function(target, event)
 
			if target:hitTestPoint(event.touch.x, event.touch.y) then
 
				self.ball = S09Ball.new(event.touch.x, event.touch.y, self.world, self.pack, self.ph)
 
			end
		end
 
		self:addEventListener(Event.TOUCHES_BEGIN, self.onTouch, self)

Thanks heaps for any help

Ninjadoodle · November 2017

Got it! I was not referencing the sprite correctly inside the ENTER_FRAME function ...

Since I'm using a class, it needs to be something like this ...

function Stage09:onEnterFrame()
 
    self.world:step(1/60, 8, 3)
 
    for i = 1, self.ph:getNumChildren() do
 
        local item = self.ph:getChildAt(i)
 
        if item.sprite.body then
 
            local body = item.sprite.body
            local bodyX, bodyY = body:getPosition()
            item.sprite:setPosition(bodyX, bodyY)
            item.sprite:setRotation(body:getAngle() * 180 / math.pi)
 
        end
    end
end

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