Balls down

Games
#1

Hi everyone. As usual, I got a question

I got some balls up the screen, but I want to set some like a fan that make them down. What can I use to do these. I was seeing some of applyLinearImpulse but I dont get it. Its that what I shoud use?

Thanks [import]uid: 81363 topic_id: 19513 reply_id: 319513[/import]

#2

You could try changing the gravity. That would cause global physics changes and all physics items would start moving. Or you can loop through and use either applyLinearImpulse or applyLinearVelocity. Impulse depends on the mass and density of the object while velocity is only interfered with by gravity. [import]uid: 54716 topic_id: 19513 reply_id: 75339[/import]

#3

Thanks for replying ir8, but the balloon object is kinematic, so the gravity doesnt affect they. I was trying that. But it doesn´t works. The balloon is in one module and the fan in other. Here I post the code for both. Thanks again

[code]

– This is the balloon module

module(…, package.seeall)

thresholds = {}

state = {}

local function checkThreshold(obj1,obj2)
if(obj1 and obj2) then
if(obj1.y < obj2[1].boundary and obj1.y > obj2[2].boundary) then

if(obj1.multiplier == nil) then

end

–print(obj2[1].multiplier … “: thresh 1”)

obj1.multiplier = obj2[1].multiplier

elseif(obj1.y < obj2[2].boundary and obj1.y > obj2[3].boundary) then

if(obj1.multiplier == obj2[1].multiplier) then
obj1:flash()
end

obj1.multiplier = obj2[2].multiplier

–print(obj2[1].multiplier … “: thresh 2”)

elseif(obj1.y < obj2[3].boundary and obj1.y > -10) then

if(obj1.multiplier == obj2[2].multiplier) then
obj1:flash()
end

obj1.multiplier = obj2[3].multiplier
–print(obj2[1].multiplier … “: thresh 3”)
elseif(obj1.y < -10) then
if(obj1.timer) then
obj1:pop()
end
end
end
end
function newBalloon(velocity)

local balloon = display.newImageRect(“burbuja.png”, 100, 100)
balloon.x = _W/2; balloon.y = _H+20

balloon.type = “balloon”
balloon.hit = false
balloon.multiplier = nil
balloon.points = 1

balloon.tween = {start={}, finish= {}}

function balloon:flash()
local x5 = self.xScale
local y5 = self.yScale
local factor = 0.3

local function tweenBack()
transition.to(self, {time= 150, xScale = 1, yScale = 1})
end
self.tween.finish = tweenBack
self.tween.start = transition.to(self, {time= 100, xScale = x5 + factor, yScale = y5 + factor, onComplete = self.tween.finish})

end

function balloon:pop()

state:dispatchEvent({name=“change”, state=“pop”})

if(self.timer) then
timer.cancel(self.timer)
self.timer = nil
end

self.isVisible = false

if(self.tween.start) then
self.tween.start = nil
end

if(self.tween.finish) then
self.tween.finish = nil
end

self.tween = nil

self:removeSelf()
self = nil
collectgarbage(“collect”)
end

balloon.timer = timer.performWithDelay(20, function(e)
checkThreshold(balloon, thresholds)
end, -1)

physics.addBody(balloon, “kinematic”, {density= 0, bounce= 0, friction= 0, radius= 40})
balloon:setLinearVelocity(0, velocity * -1)

function balloon:touch(e)
if(e.phase == “began”) then
self.isVisible = false
end
end

balloon:addEventListener(“touch”, balloon)

return balloon

end
— HERE IS THE FAN.LUA MODULE, OR, WHAT I GOT FOR NOW
module(…, package.seeall)

function newVenti()

local venti = display.newImage(“fan.png”)
venti.x = 100; venti.y = 300

venti.type = “venti”

physics.addBody(venti, “kinematic”, {density=0.2, friction=0.2, bounce=0.5, radius= 20})

function venti:touch(event)

if event.phase == “began” then
if event.other.type == “balloon” then

balloon:setLinearVelocity(0, 10)

end
end

return true
end

venti:addEventListener(“touch”, venti)

return venti

end
[import]uid: 81363 topic_id: 19513 reply_id: 75354[/import]