In my code below, I want to make it so that the rectangle that is being dragged can only be dragged vertically in a straight line. How would I do that? Thanks!
[code]
system.activate( “multitouch” )
local function onTouch( event )
local t = event.target
local phase = event.phase
if “began” == phase then
– Make target the top-most object
local parent = t.parent
parent:insert( t )
display.getCurrentStage():setFocus( t, event.id )
– Spurious events can be sent to the target, e.g. the user presses
– elsewhere on the screen and then moves the finger over the target.
– To prevent this, we add this flag. Only when it’s true will “move”
– events be sent to the target.
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
elseif t.isFocus then
if “moved” == phase then
– Make object move (we subtract t.x0,t.y0 so that moves are
– relative to initial grab point, rather than object “snapping”).
t.x = event.x - t.x0
t.y = event.y - t.y0
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( t, nil )
t.isFocus = false
end
end
– Important to return true. This tells the system that the event
– should not be propagated to listeners of any objects underneath.
return true
end
local rectangle = display.newRect(100,100,50,50)
rectangle:addEventListener(“touch”,onTouch)
[/code] [import]uid: 38001 topic_id: 12270 reply_id: 312270[/import]