Hi,
I’m trying to implement this listener function for the specified feature in subject, everything is working find except for the rotate, the object actually rotates with a strange behavior (like it receive a -0, +180, -0).
Attached below the “incriminating” code, someone can help me with this issue or have an already made function that implements the 3 specified features ?
Thanks in advance
local function calculateDelta( previousTouches, event )
local id,touch = next( previousTouches )
if event.id == id then
id,touch = next( previousTouches, id )
assert( id ~= event.id )
end
local dx = touch.x - event.x
local dy = touch.y - event.y
return dx, dy
end
function imageEvent ( self, event )
local t = event.target
local pi = math.pi
local atan2 = math.atan2
local newRotation
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
t.x0 = event.x - t.x
t.y0 = event.y - t.y
-- Store initial position of finger
t.x1 = event.x
t.y1 = event.y
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
t.x2 = event.x
t.y2 = event.y
angle1 = 180/pi \* atan2(t.y1 - t.y, t.x1 - t.x)
angle2 = 180/pi \* atan2(t.y2 - t.y, t.x2 - t.x)
rotationAmt = angle1 - angle2
--rotate it
newRotation = t.rotation-rotationAmt
t.rotation = newRotation
t.x1 = t.x2
t.y1 = t.y2
if ( dx and dy ) then
local newDistance = math.sqrt( dx\*dx + dy\*dy )
local scale = newDistance / self.distance
if ( scale \> 0 ) then
self.xScale = self.xScaleOriginal \* scale
self.yScale = self.yScaleOriginal \* scale
end
end
else
-- Move Object
t.x = event.x - t.x0
t.y = event.y - t.y0
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
print(self.x+(self.width/2))
if self.x+(self.width/2) \< 300 then self:removeSelf() 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 [import]uid: 21692 topic_id: 15155 reply_id: 315155[/import]
[import]uid: 52491 topic_id: 15155 reply_id: 56360[/import]