i am new to using loqSprite, i am trying to drag a loqSprite sprite object but its not getting done , however it calls its listener only once and then after neither its touch listner is getting called nor even it gives any error, the sprite is playing. Also i thought that might my drag/listener function might be buggy but when i tried the same dragging (movePen() function ) on the inbult corona's Sprite object it works fine. what i am missing i dont know . Can anyone please help me .... below is the code snippet. thanks
local function movePen(event)
local targetObj= event.target;
if event.phase == 'began' then
display.getCurrentStage():setFocus(targetObj);
targetObj.isFocus = true;
targetObj.y = event.y;
elseif event.phase == 'moved' then
targetObj.x = event.x;
targetObj.y = event.y;
elseif event.phase == 'ended' then
display.getCurrentStage():setFocus(nil);
targetObj.isFocus = false;
end
return true;
end --end of touch/move function
local spriteFactoryForPen = loqsprite.newFactory('penAnimation')
local penSpriteAnim = spriteFactoryForPen:newSpriteGroup('pen_write')
penSpriteAnim.x = 100
penSpriteAnim.y = 200
local function spriteEvent (e) --listener to play in loop
if(e.phase == "end") then
penSpriteAnim:play()
end
end -- end of sprit event function
penSpriteAnim:addEventListener("touch", movePen); -- adding listener to move pen object
penSpriteAnim:addEventListener("sprite", spriteEvent) -- adding listener to play in loop
penSpriteAnim:play('pen_write') -- playing pen Sprite
First of all there is no need to call penSpriteAnim:play() in loop. Because it will automatically play in loop untill you don't call the penSpriteAnim:pause() function.
For your touch listener, You should declare all the local variable on top of the page.
I am not sure about this, but hope this will work. Because lua is compiling top to bottom.
Related
So....Something weird has happened with my game. In my game theres 2 sequences for animation: Hop and Drop
local sequenceData = {
{name="hop", start=1, count=1, time=300},
{name="drop", start=2, count=1, time=300}
}
Theye are called from a function called 'MovePlayer()
function movePlayer(event)
bird.bodyType = "dynamic"
gameStarted = true
if event.phase == "began" then
bird:setLinearVelocity(0, -flapForce)
playSFX(sndJump)
bird:setSequence("hop")
print("Hop")
elseif event.phase == "ended" then
bird:setSequence("drop")
print("Drop")
end
return true
end
These worked fine before but now I don't see any of the animation when I tap the screen and expect the hop sequence to play out. Any idea whats wrong? The game is was created way back in April.
Cheers
After changing the sequence, the sprite will not play automatically — call object:play() to continue playing on the new sequence.
Corona Docs
Circles of variable sizes will be drawn on blank.png (800 X 800) on touch and in run time. On touch, the coordinates (the positions of x-axis and y-axis coordinates in runtime on touch) will be stored in two variables myCoordx and myCoordy in began event. When a user moves his/her fingers on screen, circle will be drawn based on calculated radius and coordinates. Now the error keeps on appearing. Please help me to debug this code.
Runtime error
d:\corona projects\enterframeevent\main.lua:14: attempt to index global 'drawCircle' (a nil value)
stack traceback:
d:\corona projects\enterframeevent\main.lua:14: in main chunk
This is my main.lua file.
local screen = display.newImage( "blank.png")
function drawCircle:touch(event)
if event.phase == "began" then
local myCoordx = event.x
local myCoordy = event.y
elseif event.phase == "moved" then
local rad = (event.x - myCoordx) ^ 2
local myCircle = display.newCircle(event.x, event.y, rad )
myCircle:setFillColor( 1, 0, 1 )
end
end
Runtime:addEventListener( "touch", drawCircle )
Apparently you try to add :touch method to drawCircle, but you don't define it anywhere. You should init it to something at very least an empty table - i.e. {} or use relevant Corona method to create it.
As per my comment, the code posted can't write, or the error message is wrong. I'll assume the error is wrong, because the statement function drawCircle:touch(event) on line 3 attempts to add a method called touch(self) to a drawCircle table; yet the code does not create this table anywhere. You are either missing drawCircle = display.newSomething..., OR you could simply use a function not a method:
function touch(event)
...
end
Runtime:addEventListener( "touch", touch)
The latter works only because your touch function doesn't use the keyword self, which is an implicitly created variable for methods.
I think you could go with something like this:
-- I think you should define these outside the function
-- since they'll be out of scope in the "moved" phase
local myCoordx = 0
local myCoordy = 0
-- Moved this declaration outside the function
-- so it can be reused, and removed
local myCircle
function onTouch(event)
if event.phase == "began" then
myCoordx = event.x
myCoordy = event.y
elseif event.phase == "moved" then
local rad = (event.x - myCoordx) ^ 2
-- Keep in mind that this line will draw a new circle everytime you fall into the "moved" phase, keeping the old one
-- if i understood well, this is not what you want
-- local myCircle = display.newCircle(event.x, event.y, rad )
-- Try this instead, removing the old display object...
if myCircle then
myCircle:removeSelf()
myCircle = nil
end
-- ...and adding it again
myCircle = display.newCircle(event.x, event.y, rad )
myCircle:setFillColor( 1, 0, 1 )
end
end
-- Since "drawCircle" is not defined, point it directly to a function (in this case, "onTouch")
-- Runtime:addEventListener( "touch", drawCircle )
Runtime:addEventListener( "touch", onTouch )
Didn't have the chance to test the code on Simulator, i'll try it later and update the answer if needed.
UPDATE:
Tested it, and it works as i expected.
I'm all very new to this and everything in this project is just placeholders and scrap work. Some of you may recognize some of the graphics used from other Corona tutorials, but it's to help me get better, so don't be too judgemental. Here's a link to the download for the Corona Simulator: http://www.mediafire.com/download/6a78bsewgwsiyp2/GooMan.rar
Anyways, here's my issue. The jump button seems fine at first. If I hold it down, the character constantly jumps. And if I let go, he stops. If I simultaneously hold down jump while pushing one of the arrow buttons, he'll jump in that direction. However, it seems as though if I jump once, then I hit the jump button again RIGHT as the character is making contact with the ground, that he won't jump. There's a sudden lack of responsiveness. I literally have to pause slightly and wait for the character to fully hit the ground before I can make another successful jump. Why?
And here's all the relevant code for you to look at:
I have this at the beginning to help define my goo character's position:
local spriteInAir = false
local yspeed = 0
local oldypos = 0
local holding = false
I then created the jump button.
local bJump = display.newImage("Images/jumpbutton.png")
bJump.x = 445
bJump.y = 265
bJump.xScale = 0.78
bJump.yScale = 0.78
Followed up by creating an enterFrame Runtime Event which will update my goo character's position in the Y. Running the game at 60fps if that's relevant.
function checkSpeed()
yspeed = sprite.y - oldypos
oldypos = sprite.y
if yspeed == 0 then
spriteInAir = false
else
spriteInAir = true
end
end
Runtime:addEventListener( "enterFrame", checkSpeed )
Then the meat of it all. Created a function called hold which tells the game to not only make my goo character jump, but to keep my goo character constantly jumping as long as the bJump button is held down. Works perfectly. The "jumping" function is a touch event that listens for the hold function, and all of it is executed by the bJump button listening to the jumping function.
local function hold()
if holding and spriteInAir == false then
sprite:applyForce( 0, -8, sprite.x, sprite.y )
sprite:setLinearVelocity(0, -350)
spriteInAir = true
return true
end
end
local function jumping( event )
if event.phase == "began" then
display.getCurrentStage():setFocus( event.target )
event.target.isFocus = true
event.target.alpha = 0.6
Runtime:addEventListener( "enterFrame", hold )
holding = true
elseif event.target.isFocus then
if event.phase == "moved" then
elseif event.phase == "ended" then
holding = false
event.target.alpha = 1
Runtime:removeEventListener( "enterFrame", hold )
display.getCurrentStage():setFocus( nil )
event.target.isFocus = false
spriteInAir = false
return true
end
end
return true
end
bJump:addEventListener("touch",jumping)
Anyone who can help me identify this problem, I'd greatly appreciate it!
You're using a velocity check to detect if the character is on the ground. It can take a short while to set it back to zero after colliding with Box2D, so the better way to do it is to use a collision sensor:
sprite.grounded = 0 -- Use a number to detect if the sprite is on the ground; a Boolean fails if the sprite hits two ground tiles at once
function sprite:collision(event)
if "began" == event.phase then
-- If the other object is a ground object and the character is above it...
if event.other.isGround and self.contentBounds.yMax < event.other.contentBounds.yMin + 5 then
sprite.grounded = sprite.grounded + 1 -- ...register a ground collision
end
elseif "ended" == event.phase then
-- If the other object is a ground object and the character is above it...
if event.other.isGround and self.contentBounds.yMax < event.other.contentBounds.yMin + 5 then
sprite.grounded = sprite.grounded - 1 -- ...unregister a ground collision
end
end
end
sprite:addEventListener("collision")
Then, in your jump function, just check to see if sprite.grounded > 0. If it is, the player is grounded.
--up in the level1.lua
local target
--in the enter frame function of scene
function target:touch(event)
if event.phase=="began" then
local target=display.newImage("target.png",event.x,event.y)
return true
end
end
function target:touch(event)
You have not created target yet. You cannot assign a touch handler to an object that doesn't exist yet.
It sounds like what you need to do is add a touch handler to the stage. I would pre-create the image and just hide it using .isVisible = true. Then in your touch handler, show and hide the object. But regardless you have to put the touch handler on the whole screen and not an individual small image.
Remove the "local" in target:touch: it hides the module local, using a variable local to target:touch(). Also, if you want image to disappear after touch done, use the "ended" and "cancelled" phases of touch event. Finally, I'm assuming that you initialized target to something but if not, you must add that too, otherwise how can you define touch:event (thanks to Rob for noticing this btw):
-- first create the target, but don't show it:
local target = display.newImage("target.png", 0, 0)
target.isVisible = false
--in the enter frame function of scene
function target:touch(event)
if event.phase=="began" then
target.x = event.x
target.y = event.y
return true
else if event.phase == "ended" or event.phase == "cancelled" then
if target ~= nil then
target:removeSelf()
target = nil
end
return true
end
end
I want to call removeBody function when i click on an object. As soon as i click
the object the removeBody function must be called on an object and after i release the
mouse then it must again behave like a physics object. These are the code that i
was trying. please give any suggestion
local function removephysics(objId)
physics.removeBody(objId)
end
local Bodyobject={density=3.0, friction=0.2, bounce=0.3, radius=20}
object1=display.newImage("img1.png")
object1.x=325
object1.y=200
object1.id="obj"
physics.addBody(object1,Bodyobject)
object1.addEventListener("touch",removephysics)
you can use event.phase to get the state of touch listener see this code
physics = require("physics")
physics.start()
local Bodyobject={density=3.0, friction=0.2, bounce=0.3, radius=20}
function removephysics(event)
if event.phase == "began" then
physics.removeBody(object1)
elseif event.phase == "ended" then
physics.addBody(object1,Bodyobject)
end
end
object1=display.newImage("img1.png")
object1.x=325
object1.y=200
object1.id="obj"
physics.addBody(object1,Bodyobject)
object1:addEventListener("touch",removephysics)