Box2d and Animated Sprite

glennbjr · April 2012

I didn't see any examples of creating a box2d body and adding an animated sprite to it. I'm having problems with this. I can get it working but the sprite is not lined up properly with the box2d body. I'm using texture packing too. I would like to play the animation on demand. I'm not sure what the best way to do this.

ar2rsawseen · April 2012

So you have a texture pack, you create regions from texture pack and then create bitmaps from regions.
For each bitmap, set it's anchor point to 0.5.
And use movie clip to create animation.

You can set a default image to be shown and create a function to play animation

local pack = TexturePack.new({"gfx/1.png", "gfx/2.png", "gfx/3.png", "gfx/4.png"})
 
local region1 = TexturePack:getTextureRegion("gfx/1.png")
local region2 = TexturePack:getTextureRegion("gfx/2.png")
local region3 = TexturePack:getTextureRegion("gfx/3.png")
local region4 = TexturePack:getTextureRegion("gfx/4.png")
 
local bitmap1 = Bitmap.new(region1)
local bitmap2 = Bitmap.new(region2)
local bitmap3 = Bitmap.new(region3)
local bitmap4 = Bitmap.new(region4)
 
bitmap1:setAnchorPoint(0.5, 0.5)
bitmap2:setAnchorPoint(0.5, 0.5)
bitmap3:setAnchorPoint(0.5, 0.5)
bitmap4:setAnchorPoint(0.5, 0.5)
 
local mc = MovieClip.new{
    {1, 1, bitmap1}, 
    {2, 2, bitmap2}, 
    {3, 3, bitmap3}, 
    {4, 4, bitmap4}
}
 
--set animation loop
mc:setGotoAction(5, 1)
 
--goto first image and stop
mc:gotoAndStop(1)
 
--function to play animation (looping)
mc.playAnim = function()
    mc:gotoAndPlay(1)
end
 
mc.stopAnim = function()
    mc:gotoAndStop(1)
end
 
--then use it like
mc.playAnim()
mc.stopAnim()

Haven't actually tried the code out, but something like this should work.

glennbjr · April 2012

It's all working now. Thank you. Although I'm using tables your code did help. Part of the problem was not setting an anchor point and the other part was not using movie clip right.

glennbjr · May 2012

In case anyone finds this thread a link to a great tutorial for creating and animating box2d objects with Gideros is below.

Animating Box2d objects
http://appcodingeasy.com/Gideros-Mobile/Animating-Box2d-objects

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