Orbital Rotation
Showing how to set up an orbital rotation for your corona sdk
project. In this example the moon orbits the earth.
Download Source:
http://www.sims3tinkers.com/orbitalrotationcoronasdk.zip
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | -- -- Orbital Rotation - Moon around Earth -- Demonstrates one method for orbiting objects -- By Wintermuteai1 - http://www.sims3tinkers.com -- Version: 1.0 -- -- Sample code is MIT licensed, see http://developer.anscamobile.com/code/license -- Copyright (C) 2011 ANSCA Inc. All Rights Reserved. local physics = require("physics") physics.start() --system.activate( "multitouch" ) physics.setGravity(0, 0) --physics.setDrawMode( "hybrid" ) display.setStatusBar( display.HiddenStatusBar ) local background = display.newImage( "space.png", true ) background.x = display.contentWidth / 2 background.y = display.contentHeight / 2 local planet1 = display.newImage( "earth.png" ) planet1.x = 160; planet1.y = 230 planet1.xScale = 0.7 planet1.yScale = 0.7 physics.addBody( planet1, {radius=40 } ) planet1.bodyType = "static" local moon = display.newImage( "moon.png", 40, 40) moon.x = planet1.x + 80 moon.y = planet1.y moon.xScale = 0.3 moon.yScale = 0.3 moon.rotation = 100 physics.addBody( moon, {radius=16 } ) moon.bodyType = "dynamic" myJoint = physics.newJoint( "pivot", moon, planet1, planet1.x, planet1.y ) local rotateIt = function( event ) moon.rotation = moon.rotation + 1.5 end Runtime:addEventListener( "enterFrame", rotateIt ) |
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Replies
Posted on Mon, 2011-10-03 12:52
#2
Dr Rafeal H. Did a youtube post on this some time back, basically doing what you are doing. Uses the same earth and moon as you as well.
Different ways to do different things.
Posted on Mon, 2011-10-03 16:07
#3
@nicholasclayg:
Very interesting! I hadn't seen that before.
As you say different ways to accomplish rotation,
Corona is such a great tool!
cheers
-Winter
@nicholas.windsor: Glad you like it!
Posted on Mon, 2011-10-24 13:11
#4
Nice! If I wanted to stop the rotation of the moon later on, with the press of a button for example, what would be the command to make it stop? Thanks!
Posted on Sun, 2011-12-18 08:41
#5
Hey Nathan,
.. you can simply do the following:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | local function stopRotation(event) Runtime:removeEventListener("enterFrame", rotateIt) end stopButton = ui.newButton{ default = "buttonRed.png", over = "buttonRedOver.png", x = 160, y = 450, onPress = stopRotation, text = "Stop", emboss = true } |
and you should type this line in the begining of the main.lua file
local ui = require("ui")
cheers ;)
Posted on Mon, 2012-02-20 12:37
#6
I am using a very similar setup to this and I've noticed when I place "moon.x = planet1.x + 57" or closer the rotation doesn't work.
I prefer to keep using pivot joints with .rotation. Any thoughts?
Works a treat, thanks.
Code is very easy to follow, even for a newbie.
Thanks for sharing.
Nick