Hello,
I am trying to have both gestures in one of my project pages. If user swipes the background, it goes to the following page. If he/she “pinches” to zoom, the group background zooms in/out.
For the swipe, I am using the following code with success:
local function flip (event)
if event.phase =="ended" then
if event.xStart \< event.x and (event.x - event.xStart) \>= 30 then
if (curPage \> 1) then
director:changeScene( "page\_"..curPage-1, "moveFromLeft" )
end
elseif event.xStart \> event.x and (event.xStart-event.x) \>= 30 then
if (curPage \< numPages) then
director:changeScene("page\_"..curPage+1, "moveFromRight")
end
end
end
end
layer1:addEventListener("touch", flip) My issue resides when I try to add the pinch code (extracted from the PinchZoomGesture sample app):
function background:touch( event )
local result = true
local phase = event.phase
local previousTouches = self.previousTouches
local numTotalTouches = 1
if ( previousTouches ) then
-- add in total from previousTouches, subtract one if event is already in the array
numTotalTouches = numTotalTouches + self.numPreviousTouches
if previousTouches[event.id] then
numTotalTouches = numTotalTouches - 1
end
end
if "began" == phase then
-- Very first "began" event
if ( not self.isFocus ) then
-- Subsequent touch events will target button even if they are outside the contentBounds of button
display.getCurrentStage():setFocus( self )
self.isFocus = true
previousTouches = {}
self.previousTouches = previousTouches
self.numPreviousTouches = 0
elseif ( not self.distance ) then
local dx,dy
if previousTouches and ( numTotalTouches ) \>= 2 then
dx,dy = calculateDelta( previousTouches, event )
end
-- initialize to distance between two touches
if ( dx and dy ) then
local d = math.sqrt( dx\*dx + dy\*dy )
if ( d \> 0 ) then
self.distance = d
self.xScaleOriginal = self.xScale
self.yScaleOriginal = self.yScale
print( "distance = " .. self.distance )
end
end
end
if not previousTouches[event.id] then
self.numPreviousTouches = self.numPreviousTouches + 1
end
previousTouches[event.id] = event
elseif self.isFocus then
if "moved" == phase then
if ( self.distance ) then
local dx,dy
if previousTouches and ( numTotalTouches ) \>= 2 then
dx,dy = calculateDelta( previousTouches, event )
end
if ( dx and dy ) then
local newDistance = math.sqrt( dx\*dx + dy\*dy )
local scale = newDistance / self.distance
print( "newDistance(" ..newDistance .. ") / distance(" .. self.distance .. ") = scale(".. scale ..")" )
if ( scale \> 0 ) then
self.xScale = self.xScaleOriginal \* scale
self.yScale = self.yScaleOriginal \* scale
end
end
end
if not previousTouches[event.id] then
self.numPreviousTouches = self.numPreviousTouches + 1
end
previousTouches[event.id] = event
elseif "ended" == phase or "cancelled" == phase then
if previousTouches[event.id] then
self.numPreviousTouches = self.numPreviousTouches - 1
previousTouches[event.id] = nil
end
if ( #previousTouches \> 0 ) then
-- must be at least 2 touches remaining to pinch/zoom
self.distance = nil
else
-- previousTouches is empty so no more fingers are touching the screen
-- Allow touch events to be sent normally to the objects they "hit"
display.getCurrentStage():setFocus( nil )
self.isFocus = false
self.distance = nil
self.xScaleOriginal = nil
self.yScaleOriginal = nil
-- reset array
self.previousTouches = nil
self.numPreviousTouches = nil
end
end
end
return result
end
background:addEventListener( "touch", background ) What happens is most of times, during the pinch gesture, the pages goes to the following page as it gets confused with the flip function.
Ideas? [import]uid: 4883 topic_id: 18228 reply_id: 318228[/import]
[import]uid: 52491 topic_id: 18228 reply_id: 69857[/import]