Touch Event not responding

simran · May 2014

My question concerns only about the Touch event. I have only 1 object in dummy class which I want to move to new position when the screen is touched, but the touch event does not seem to dispatch.What can I do to fix this? I don't think i need hitTestPoint in this case since the position on touch doesn't concern me in this code and I have only one object, help, please?
dummy = Core.class(Sprite)
function dummy: init()
--[[local texture = Texture.new("dummy.png")
sprite = Bitmap.new(TextureRegion.new(texture, 10,5, 30, 35))
sprite:setPosition(220, 50)
self:addChild(sprite)]]--

local pack = TexturePack.new("dum.txt", "dum.png")

self.anim = {
Bitmap.new(pack:getTextureRegion("f1.PNG")),
Bitmap.new(pack:getTextureRegion("f2.PNG")),
Bitmap.new(pack:getTextureRegion("f3.PNG")),
--Bitmap.new(pack:getTextureRegion("l1.PNG")),
--Bitmap.new(pack:getTextureRegion("l2.PNG")),
--Bitmap.new(pack:getTextureRegion("l3.PNG")),
Bitmap.new(pack:getTextureRegion("b1.PNG")),
Bitmap.new(pack:getTextureRegion("b2.PNG")),
Bitmap.new(pack:getTextureRegion("b3.PNG")),
--Bitmap.new(pack:getTextureRegion("r1.PNG")),
--Bitmap.new(pack:getTextureRegion("r2.PNG")),
--Bitmap.new(pack:getTextureRegion("r3.PNG"))

}

self.frame = 1
self:addChild(self.anim[1])
self:setPosition(220, 50)
self.nframes = #self.anim

self.subframe = 0
self: addEventListener(Event.ADDED_TO_STAGE, self.whenAddedToStage, self)
self: addEventListener(Event.TOUCHES_BEGIN, self.whenTouched, self)
self: addEventListener(Event.TOUCHES_END, self.touchEnded, self)
end

function dummy: whenAddedToStage()
self:addEventListener(Event.ENTER_FRAME,self.whenEntersFrame,self)
end
function dummy: whenEntersFrame()
speed = 3
speedScale = (1*2*3.14)/speed
angle = os.timer()*speedScale
x, y = self:getPosition()
self.subframe = self.subframe + 1

if self.subframe > 21 then
self:removeChild(self.anim[self.frame])

self.frame = self.frame + 1
if self.frame > self.nframes then
self.frame = 1
end

self:addChild(self.anim[self.frame])

self.subframe = 0

end

x = 215 + math.cos(angle)*195
y = 130 + math.sin(angle)*115
self:setPosition(x,y)
end

function dummy: whenTouched()
k,l = self:getPosition()
self:setPosition(k+ 10, y + 100)
event:stopPropagation()
end

function dummy: touchEnded()
m,n = self:getPosition()
self:setPosition(m, n-20)
end

ar2rsawseen · May 2014

@simran first check
Do you use it on device or Desktop player?
If Desktop player, then do you have touch evens enabled in Project properties (right click on project name -> properties -> Input tab -> Mouse events generate touch events)

You can also put print("something") in the touch events to see if they actually get called, but from what I see it seems they should work.

simran · May 2014

ar2rsawseen Thank you for your reply, Actually No, I am testing it using Gideros AndroidPlayer, I have it installed in my phone. I tested using the print value, the values got printed but the position of player is not getting updated, The player is actually moving already and I want it to jump when user touches the screen and that does not seem to happen.

ar2rsawseen · May 2014

@simran ah I see
on each enterframe event you reset the x and y positions, thus the momentary changed from touch events are completely ignored and your object does not change any position

simran · May 2014

@ar2rswseen: Thank you for the hint, but thinking about it since morning, I feel my head is jammed and I am new to Lua as well, so could you please exactly point what changes I need to make in the code to fix it?

simran · May 2014

I tried adding eventListeners for Touch events in whenEntersframe() function but that did not work either.

ar2rsawseen · May 2014

@simran the problem is that you do not take in the account current position of the player, but simply set the position as:

x = 215 + math.cos(angle)*195
y = 130 + math.sin(angle)*115
self:setPosition(x,y)

I am unaware of what exactly you want to achieve, so I can't tell how to do it properly, but you need to add current x and y position into equation and modify them, not simply resetting them

--this won't work as you expect, but the point is
--you need to reuse the x and y values
local x, y = self:getPosition()
x = 215 + math.cos(angle)*195 + x
y = 130 + math.sin(angle)*115 + y
self:setPosition(x,y)

simran · May 2014

@ar2rsawseen: Oh, okay .Thank you so much

Hope it gets fixed.Will post if it does

simran · May 2014

actually, I have a body moving in an ellipse continuously and I want to make it jump when user touches the screen and get it back when touch ends

ar2rsawseen · May 2014

Ok then try something like:

--define offset values in dummy:init method
self.offsetX = 0
self.offsetY = 0

Then add offsets on enter frame event

 x = 215 + math.cos(angle)*195 + self.offsetX
 y = 130 + math.sin(angle)*115 + self.offsetY
 self:setPosition(x,y)

Then modify offsets inside touch events:

function dummy: whenTouched()
self.offsetY = self.offsetY -100
end
 
function dummy: touchEnded()
self.offsetY = 0
end

Now everytime you click the screen the player should go up by 100 px and on release go back

You can adjust offsets as you want

simran · May 2014

@ar2rswseen : I tried using a boolean variable, touched and set its value to true in whenTouched and TouchEnded function and otherwise false, and then added this if statement:
but still it does not seem to work, I think the issue you were shall be fixed using this, no?
Though I could not figure out a way to use x in the same position update statement

if playertouch == true then
x = 215 + math.cos(angle)*195
y = 130 + math.sin(angle)*115
else
y = y + 600
end

simran · May 2014

@ar2rswseen: I tried doing exactly the same thing and it still does not work, no change in player's movement

ar2rsawseen · May 2014

Here is the code that works for me:

dummy = Core.class(Sprite)
 function dummy: init()
self:addChild(Bitmap.new(Texture.new("ball.png", true)))
 self: addEventListener(Event.ADDED_TO_STAGE, self.whenAddedToStage, self)
 self: addEventListener(Event.TOUCHES_BEGIN, self.whenTouched, self)
 self: addEventListener(Event.TOUCHES_END, self.touchEnded, self)
 self.offsetX = 0
 self.offsetY = 0
 end
 
function dummy: whenAddedToStage()
self:addEventListener(Event.ENTER_FRAME,self.whenEntersFrame,self)
end
 
function dummy: whenEntersFrame()
speed = 3
 speedScale = (1*2*3.14)/speed
angle = os.timer()*speedScale
 local x, y = self:getPosition()
 
 x = 215 + math.cos(angle)*195 + self.offsetX
 y = 130 + math.sin(angle)*115 + self.offsetY
 self:setPosition(x,y)
end
 
function dummy: whenTouched()
self.offsetY = self.offsetY -100
end
 
function dummy: touchEnded()
self.offsetY = 0
end
 
stage:addChild(dummy.new())

simran · May 2014

Thanks a ton ;D

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