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Sprites, layers and physics bodies... — Gideros Forum
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    Sprites, layers and physics bodies...

    Tom2012Tom2012 Guru
    edited October 2012 in General questions
    When adding a 'layer' to a scene like this:
    local layer = Sprite.new();
self:addChild(layer);
    How do you then get the layer child included in the onEnterFrame loop that updates all the physic bodies and sprites:
    local function onEnterFrame() 
 
-- edit the step values if required. These are good defaults!
self.world:step(1/60, 8, 3)
 
for i = 1, self:getNumChildren() do
local sprite = self: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
    Would you create a separate loop for each layer?

    Thanks
    Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      Well if you have multiple layers hierarchy for Sprites representing box2d objects (or same case if you have more none box2d objects than with box2d on looping layer), it would make more sense to create a separat table with references to all bodies or sprites to loop through and do the position update.
      Or else you would simply waste your valuable resources looping through objects on multiple dimensions or through objects, that does not have box2d bodies attached.

      Look at http://www.giderosmobile.com/forum/discussion/1780/extending-gideros#Item_1 implementation of box2d wrapper for updating objects ;)
      http://appcodingeasy.com/Gideros-Mobile
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    • Tom2012Tom2012 Guru
      got it! Thanks. ;-)
      -- Function to update box2D world each frame
 
local function onEnterFrame() 
 
-- edit the step values if required. These are good defaults!
self.world:step(1/60, 8, 3)
 
for i,v in pairs(spritesOnScreen) do
local sprite = v;
local body = sprite.body
if(not body.destroyed) then
local bodyX, bodyY = body:getPosition()
sprite:setPosition(bodyX, bodyY)
sprite:setRotation(body:getAngle() * 180 / math.pi)
else
-- the body has been removed, we dont need this sprite in the table any more
table.remove(spritesOnScreen,i)
print("removed");
end
end
end
      Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
      +1 -1Share on Facebook
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