In Corona, I need help moving a character to one of three points by swipe - coronasdk

Question

When a user swipes the screen, I need the player to move to specific position. So, if the player is in the center of the screen, and the user swipes left, the x position is -100. If the user swipes right again, the player would move back to center. Another swipe right would put the x position at + 100. A swipe right would do nothing from that point, but a swipe left would move them back to center See below for text visual: Any help would be GREATLY APPRECIATED!
swipe swipe
<----> <---->
X X X

Answer 1

Implementing "swipe" is pretty easy, but you have to understand touch handlers and the different event phases and the data passed to the handler to make a lot of sense for this.
A swipe is nothing more than a touch that moves in a direction and then the app responds to the action. This is similar to dragging, but a drag moves the object with the touch. The basic touch handler is something like this:
local LEFT = 50
local CENTER = display.contentCenterX
local RIGHT = display.contentWidth - 50
local object = display.newCircle( display.contentCenterX, display.contentCenterY, 25 )
local function handleSwipe( event )
if event.phase == "moved" then
local dX = event.x - event.xStart
print(event.x, event.xStart, dX)
if dX > 10 then
-- swipe right
local spot = RIGHT
if event.target.x == LEFT then
spot = CENTER
end
transition.to( event.target, {time=500, x = spot } )
elseif dX < -10 then
-- swipe left
local spot = LEFT
if event.target.x == RIGHT then
spot = CENTER
end
transition.to( event.target, {time=500, x = spot } )
end
end
return true
end
object:addEventListener( "touch", handleSwipe )
Now I used 10 px of touch movement to do this, but I normally use 5px of touch movement, adjust to taste.