I want to learn how to use the swipe feature in Corona sdk and lua.
I saw a few places in corona gigHub but couldn’t find it
also in stockOverflow I saw one code, but the guy said it was not the “best”
way.
Like a normal book, and you “flip” pages with your finger
swipe left or right
in storyboard – goToScene – but instead of using a button
use the swipe momevent.
Thanks for your help
In corona you can detect touch events with phases: began, moved and ended. So you can create big invisible rectangle on the top of the screen and make it detect touch events. For example, if distance between began point and ended point is greater then some percentage (better then fixed value to target different devices) of screen and time between this phases is less then some small vale then you can say that there was the swipe. Comparing begin and end point you can tell swipe’s direction.
I have the idea, more or less.
But I think if I have
– object.isVisible = false – So I don’t see the big rectangle.
The listener doesn’t detect the rect.
and if I use alpha = .1 – it’s almost invisible, but you can still see something.
is that the only way?
you can set
.isVisible = false
.isHitTestable = true
second line will make it react to events
PS
You can always set alpha to 0.01 
I put a .png transparent. the size of the window.
it works really good, If I touch and move the mouse.
could you tell me about the percentage %
how do I do that.
I have this code so far
local swipe = display.newImage( "swipe.png" ) group:insert (swipe) swipe.x = display.contentWidth / 2 + 256 swipe.y = display.contentHeight / 2 swipe.id = "swipe" function swipe:touch( event ) if event.phase == "began" then print( "Touch event began on: " .. self.id ) -- set touch focus display.getCurrentStage():setFocus( self ) self.isFocus = true elseif self.isFocus then if event.phase == "moved" then print( "Moved phase of touch event detected." ) elseif event.phase == "ended" or event.phase == "cancelled" then storyboard.gotoScene( "page2", "fromRight", 100 ) -- reset touch focus display.getCurrentStage():setFocus( nil ) self.isFocus = nil end end return true end swipe:addEventListener( "touch", swipe )
Thanks
In corona you can detect touch events with phases: began, moved and ended. So you can create big invisible rectangle on the top of the screen and make it detect touch events. For example, if distance between began point and ended point is greater then some percentage (better then fixed value to target different devices) of screen and time between this phases is less then some small vale then you can say that there was the swipe. Comparing begin and end point you can tell swipe’s direction.
I have the idea, more or less.
But I think if I have
– object.isVisible = false – So I don’t see the big rectangle.
The listener doesn’t detect the rect.
and if I use alpha = .1 – it’s almost invisible, but you can still see something.
is that the only way?
you can set
.isVisible = false
.isHitTestable = true
second line will make it react to events
PS
You can always set alpha to 0.01
I put a .png transparent. the size of the window.
it works really good, If I touch and move the mouse.
could you tell me about the percentage %
how do I do that.
I have this code so far
local swipe = display.newImage( "swipe.png" ) group:insert (swipe) swipe.x = display.contentWidth / 2 + 256 swipe.y = display.contentHeight / 2 swipe.id = "swipe" function swipe:touch( event ) if event.phase == "began" then print( "Touch event began on: " .. self.id ) -- set touch focus display.getCurrentStage():setFocus( self ) self.isFocus = true elseif self.isFocus then if event.phase == "moved" then print( "Moved phase of touch event detected." ) elseif event.phase == "ended" or event.phase == "cancelled" then storyboard.gotoScene( "page2", "fromRight", 100 ) -- reset touch focus display.getCurrentStage():setFocus( nil ) self.isFocus = nil end end return true end swipe:addEventListener( "touch", swipe )
Thanks