If i want move the object using acelerometer around the circle?
Instead of this:
local doTurn = function(event) rect.rotation = rect.rotation + 5 end Runtime:addEventListener( "enterFrame", doTurn )
Try this:
local onAccelerate = function( event ) --yGravity as an example for tilts in landscape rect.rotation = rect.rotation + event.yGravity\*10 end Runtime:addEventListener( "accelerometer", onAccelerate )
You can fine tune event.yGravity by editing the numerical value (10) to whatever you feel works the best
Thanks Nerolyn is working like i need
Now im trying to use this in a side view car with joints and gravity
here the code with acelerometer
[lua]
–In case you need physics
local physics = require “physics”
physics.start()
physics.setGravity( 0, 0 )
physics.setDrawMode( “hybrid” )
system.setAccelerometerInterval( 50 );
–local doTurn = function(event)
– rect.rotation = rect.rotation + 5
–end
local onAccelerate = function( event )
--yGravity as an example for tilts in landscape
rect.rotation = rect.rotation + event.yGravity*10
end
Runtime:addEventListener( “accelerometer”, onAccelerate )
rect = display.newRect(0,0,88,40)
physics.addBody(rect)
dot = display.newCircle(display.contentWidth/2,display.contentHeight/2,5)
dot:setFillColor(200,0,0)
–Change the reference point to the botton center of your rect
dot:setReferencePoint(display.CenterReferencePoint)
–Set the coords. of your rect
rect.y = dot.y
rect.x = dot.x
–dot.x = rect.x
–dot.y = rect.y
–Run the animation
–Runtime:addEventListener( “accelerometer”, doTurn )
[/lua]
I’ve encountered a pretty tricky problem.
Assume I place a circle on top of the rectangle like so:
To match rectangle rotation, assume circle properties to be:
circle.yReference = 50 circle.y = dot.y circle.x = dot.x
Now reference points is only visible by corona and not by box2D physics, so creating a normal collision filter with the circle and a player object is pretty worthless, because the physics assume the circle reference point to be the center of the circle at the original position (dot.x, dot.y).
I’ve been trying my best with using physics, but it doesn’t seem to be a viable option, I guess it would be possible if you somehow created a circular path for the little circle to follow in the same rythm as the rotating image(rectangle) - but I’m not sure if that’s possible
Hello Nerolyn,
please have a look on this post, you will find the answer : http://forums.coronalabs.com/topic/32895-using-eg-topleftalign-on-a-physics-body-only-applies-to-its-appearance-not-its-body-help/
Hope this helps,
Best,
Jérôme.
Thank you Jérôme,
basic issue solved but another one occured, here’s my code:
local dot local circle doTurn = function(event) circle.rotation = circle.rotation + 5 end dot = display.newCircle(display.contentWidth/2,display.contentHeight/2,5) dot:setFillColor(200,0,0) circle = display.newCircle(dot.x,dot.y,15) physics.addBody( circle, "static", { friction=0.3, radius=15, filter=objectCollisionFilter } ) circle.yReference = 50 circle.rotation = 3 local circleContentX, circleContentY = circle:localToContent( 0, 0 ) circle.rotation = 0 circle.yReference = 50 circle.x, circle.y = circleContentX, circleContentY circle.rotation = 3
So what happens is that the physical property of “circle”, doesn’t move from its initial position, image:
Suggestions?
Here I am with an update:
I’ve somehow got it to work by combining the example I was given and added parts of it to the doTurn function. However, some parts I can’t even imagine how box2D/corona calculates because they’re just over-the-top-of-the-highest-roof-on-planet-earth-weird.
local dot local rect local circle, circleOriginal dot = display.newCircle(display.contentCenterX,175,5) dot:setFillColor(200,0,0) rect = display.newImage("img/rect.png") rect:setReferencePoint( display.BottomCenterReferencePoint ) rect.x = dot.x; rect.y = dot.y --Only way to really get them 'synced' in the circular movement around the 'dot' is to place the circle at dot.x+2, but it really should be dot.x circle = display.newCircle(dot.x+2,dot.y - 47.5,12.5) physics.addBody( circle, "static", { friction=0.3, radius=12.5, filter=objectCollisionFilter } ) local circleContentX, circleContentY = circle:localToContent( 0, 0 ) circle.rotation = 90 circle.x, circle.y = circleContentX, circleContentY doTurn = function(event) circleContentX, circleContentY = circle:localToContent( 0, 0 ) --Why 4.15?? circle.yReference = 4.15 circle.x, circle.y = circleContentX, circleContentY circle.rotation = circle.rotation + 5 rect.rotation = rect.rotation + 5 end
This code actually works, the circle with its physical body updates its new center point every frame with the movement. However I can’t really understand how the circle.yReference must be 4.15 (or a number very close to that) when it should actually be 47.5?
I need to be doing something very wrong somewhere
EDIT: after a while (several minutes) the circle comes ahead of the rect picture in rotation, more than the 2 pixels from dot.x + 2, probably the 4.15 reference being off somewhat
Hi i tried it diffirent way maybe someones need it. please see in V1 way.
local circle = display.newCircle(100, 100, 10) local point = display.newCircle(150, 150, 5) local i=0 local function Move() i=i+0.2 local X = 80 \* math.cos(i) + point.x local Y = 80 \* math.sin(i) + point.y circle.x=X circle.y=Y if(i==360)then i=0 end local cr =display.newCircle(X, Y, 2) end Runtime:addEventListener("enterFrame", Move)Hi i tried it diffirent way maybe someones need it. please see in V1 way.
local circle = display.newCircle(100, 100, 10) local point = display.newCircle(150, 150, 5) local i=0 local function Move() i=i+0.2 local X = 80 \* math.cos(i) + point.x local Y = 80 \* math.sin(i) + point.y circle.x=X circle.y=Y if(i==360)then i=0 end local cr =display.newCircle(X, Y, 2) end Runtime:addEventListener("enterFrame", Move)