Rotate A Object With Acelerometer

tunnelstudios · April 16, 2013, 2:35pm

I want to rotate a object with acelerometer like this game:

https://www.youtube.com/watch?v=tWUaKRrXof8

i have this code:

[lua]local object = display.newImage(“object.png”)
object:setReferencePoint(display.CenterReferencePoint)
object.x = 150
object.y = 200

local acc = {}
local centerX = 150
local centerY = 200

function acc:accelerometer(e)
    object.y = centerY + (centerY * e.yGravity)


    end

    Runtime:addEventListener(“accelerometer”, acc)[/lua]

but its not working like i need

tunnelstudios · April 17, 2013, 2:01pm

I make this code:

[lua]

– Hides the status bar
display.setStatusBar (display.HiddenStatusBar);
local physics = require “physics”
physics.start()

– Set Accelerometer Interval
system.setAccelerometerInterval( 50 );

– Prevent the app from becoming suspended
system.setIdleTimer(false);
physicsData = (require “shapedefs”).physicsData(1.0)
local carro = display.newGroup()

        rodaT = display.newImageRect(“roda.png”,22,22)
        rodaT.x = 50
        rodaT.y = 175
        physics.addBody(rodaT,{density=10,friction=1,bounce=0,radius=11})
        carro:insert(rodaT)

        rodaD = display.newImageRect(“roda.png”,22,22)
        rodaD.x = 112
        rodaD.y = 175
        physics.addBody(rodaD,{density=10,friction=1,bounce=0,radius=11})
        carro:insert(rodaD)

        camaro = display.newImage(“camaro.png”)
        camaro.myName = “camaro”
        physics.addBody(camaro,physicsData:get(“camaro”))
        camaro.x = 78
        camaro.y = 180
        carro:insert(camaro)

        backDamper = display.newRect(45, 167, 10, 10)
        backDamper:setFillColor(255,75,75)
        backDamper.alpha = 0
        physics.addBody(backDamper,{density=10,friction=0,bounce=0})
        carro:insert(backDamper)

        frontDamper = display.newRect(107, 167, 10, 10)
        frontDamper:setFillColor(255,75,75)
        frontDamper.alpha = 0
        physics.addBody(frontDamper,{density=10,friction=0,bounce=0})
        carro:insert(frontDamper)

        retblue1 = display.newImage(“retblue.png”)
        physics.addBody(retblue1,“static”,{density=10,friction=5,bounce=0})
        retblue1.x = 300
        retblue1.y = 205
        carro:insert(retblue1)

        retblue2 = display.newImage(“retblue.png”)
        physics.addBody(retblue2,“static”,{density=10,friction=5,bounce=0})
        retblue2.x = 892
        retblue2.y = 205
        carro:insert(retblue2)

        retblue3 = display.newImage(“retblue.png”)
        physics.addBody(retblue3,“static”,{density=10,friction=5,bounce=0})
        retblue3.x = 1484
        retblue3.y = 205
        carro:insert(retblue3)

        rampablue1 = display.newImage(“rampablue.png”)
        rampablue1.myName = “rampablue”
        physics.addBody(rampablue1,“static”, physicsData:get(“rampablue”))
        rampablue1.x = 1990
        rampablue1.y = 100
        carro:insert(rampablue1)

        acne1 = display.newImage(“acne.png”)
        acne1.myName = “acne”
        physics.addBody(acne1,“static”, physicsData:get(“acne”))
        acne1.x = 3000
        acne1.y = -300
        carro:insert(acne1)

–joints

        backPistonJoint = physics.newJoint( “piston”, backDamper,camaro, backDamper.x,backDamper.y,0,-1)
        backPistonJoint.isLimitEnabled = true
        backPistonJoint:setLimits(15,20)
        backPistonJoint.isMotorEnabled = true
        backPistonJoint.motorSpeed = 50
        backPistonJoint.maxMotorForce = 10

        frontPistonJoint = physics.newJoint(“piston”, frontDamper, camaro, frontDamper.x, frontDamper.y,0,-1)
        frontPistonJoint.isLimitEnabled = true
        frontPistonJoint:setLimits(15,20)
        frontPistonJoint.isMotorEnabled = true
        frontPistonJoint.motorSpeed = 50
        frontPistonJoint.maxMotorForce = 10

        backPivotJoint = physics.newJoint(“pivot”, rodaT,backDamper,rodaT.x,rodaT.y)
        backPivotJoint.isMotorEnabled = true
        backPivotJoint.maxMotorTorque = 10
        backPivotJoint.motorSpeed = 0

        frontWheelJoint = physics.newJoint(“pivot”, rodaD,frontDamper,rodaD.x,rodaD.y)
        frontWheelJoint.isMotorEnabled = false
        frontWheelJoint.maxMotorTorque = 10



        left = display.newImage(“leftx.png”);
        left.x = 40 ; left.y = 300;

        right = display.newImage(“rightx.png”);
        right.x = 455; right.y = 300;

        moverx = 0;

function stop (event)
   if(event.phase == “ended”) then
       motionx = 0;
   end
end
Runtime:addEventListener(“touch”, stop );

function esquerda()
print(“left”)
moverx = -400;
end
left:addEventListener(“touch”, esquerda);

function direita()
print(“right”)
moverx = 400;
end
right:addEventListener(“touch”, direita);

function moveRoda(event)
–frontWheel.x = frontWheel.x + motionx
rodaT:applyAngularImpulse(moverx,0,rodaT.x,rodaT.y)
--backWheel:applyAngularImpulse( motionx )
–frontWheel.y = frontWheel.y + motionx
end
Runtime:addEventListener(“enterFrame”, moveRoda)

function loop(e)

    local alvo = 100 - rodaT.x
    carro.x = carro.x + ((alvo - carro.x) *0.1)
    local alvoy = 200 - rodaT.y
    carro.y = carro.y + ((alvoy - carro.y) *0.1)


end
Runtime:addEventListener(“enterFrame”,loop)

        ----------------------------------------------------------


– Speed of Movement with tilt. You can change it ans see the effects.
local tiltSpeed        = 30;
local motionx            = 0;
local motiony            = 0;
local rotation            = 0;

local function onTilt(event)
   – Its for the new position of the bird
   --motionx = tiltSpeed * event.xGravity;
   --motiony = tiltSpeed * event.yGravity;

   – Don’t change this equaton. Its for new Rotation
   rotation = (math.atan2(event.xGravity, event.yGravity) * (180/math.pi));
   if (rotation < 0) then
       rotation = 360 + rotation;
   end

end

local function moveCar (event)
   – Move to new Position
   camaro.x = motionx + camaro.x;
   camaro.y = camaro.y - motiony;


   if(camaro.x<0)then
       camaro.x = 0;
   end
   if(camaro.x>320)then
       camaro.x = 320;
   end
   if(camaro.y<0)then
       camaro.y = 0;
   end
   if(camaro.y>480)then
       camaro.y = 480;
   end
   --]]
   – Set New Angle
   camaro.rotation = rotation;
end

Runtime:addEventListener(“accelerometer”, onTilt)
Runtime:addEventListener(“enterFrame”, moveCar)

[/lua]

but when run on the device the car disappears on the screen…

tunnelstudios · April 20, 2013, 3:48pm

Hi everybody

try to explain again

I would like to rotate a car like this example:

I created a code based on that post:

http://forums.coronalabs.com/topic/33905-how-do-i-rotate-an-object-around-a-specific-axis/?hl=rotate

but when i created a car with body joints they doesn´t work

I want to rotate the car around the dot

I use a weld joint to join the body of the car (camaro) and the dot in the center of the car

[lua] weldJoint = physics.newJoint(“weld”,dot,camaro,dot.x,dot.y) [/lua]

and the function to move the car

[lua]local doTurn = function(event)
   camaro.x = dot.x + Cos(Rad(angle)) * radius
   camaro.y = dot.y + Sin(Rad(angle)) * radius

   local angleBetween = Atan2(dot.y-camaro.y, dot.x-camaro.x)
   camaro.rotation = Deg(angleBetween)

   angle = angle + event.yGravity*10
end        [/lua]

and here a the complete code with the images:

https://dl.dropboxusercontent.com/u/11765686/rotateCar.rar

Please help me

tunnelstudios · April 17, 2013, 2:01pm