move a sprite in a circular movement

a00za

i am trying to move a sprite in a circular movement but all i get information is about rotation or using the Gtween.
To explain more it is like the moon it moves circular around the earth..... that the movement i try to code but with no effort.

evs

Hello,

Here's what I use (project attached)

application:setBackgroundColor(0x000000)   local logo = Bitmap.new(Texture.new("Gideros.png"))   logo:setScale(0.5, 0.5) --scale image down to 64 * 64 logo:setAnchorPoint(0.5, 0.5) -- nchor at center   local centerX = application:getContentWidth() / 2 --center of screen x local centerY = application:getContentHeight() / 2 --center of screen y local rotationRadius = 160 --radius to rotate around local radius = rotationRadius - logo:getWidth() / 2 --radius = rotation radius minus bitmap radius local speed = 4 / rotationRadius --speed relative to the rotation radius local angle = 0 --initial angle local posX = centerX + radius --x position local posY = centerY --y position   logo:setPosition(posX, posY);   stage:addChild(logo)   function update()   angle = angle + speed posX = centerX + radius * math.cos(angle) posY = centerY + radius * -math.sin(angle) logo:setPosition(posX, posY)   end   stage:addEventListener(Event.ENTER_FRAME, update)

cheers

evs

a00za

@evs thank you soo much it worked

BJG

There are some useful notes on programming movement (including various types of circular motion) in "ActionScript 3 - A Beginner's Guide". Circular Motion is on P122 - you can preview it on Google Books.

http://books.google.co.uk/books?id=-LEW5C1jnuMC&q=122#v=snippet&q=122&f=false

a00za

@BJG thanx for the care

jdbc

Just use Movie.clip and rotation:

local sphere = Bitmap.new(Texture.new("image.png")) local animation=MovieClip.new{{1, 500, sphere,{rotation={0,360,"linear"}}}} animation:setGotoAction(500,1) sphere:setPosition(180,160) self:addChild(sphere) self:addChild(animation) animation:play()