What I used in my game may not work for you as it may not be best to use this method for multiple walls, but here it is. This drag function is taken from the “dragable platforms” sample project. I just added the 3 lines under “–limit dragging of object”. Basically it will take the Y position of the wall, and if your dragged object tries to go past it, it will set the Y coordinate back to where the wall.y is. You can also change it to x if you want to limit the horizontal drag. Again this probably won’t work for many walls but it may give you an idea.
[code]
– A basic function for dragging physics objects
local function startDrag( event )
local t = event.target
local phase = event.phase
if “began” == phase then
display.getCurrentStage():setFocus( t )
t.isFocus = true
– Store initial position
t.x0 = event.x - t.x
t.y0 = event.y - t.y
– Make body type temporarily “kinematic” (to avoid gravitional forces)
event.target.bodyType = “kinematic”
– Stop current motion, if any
event.target:setLinearVelocity( 0, 0 )
event.target.angularVelocity = 0
elseif t.isFocus then
if “moved” == phase then
t.x = event.x - t.x0
t.y = event.y - t.y0
–limit dragging of object
if t.y > wall.y then
t.y = wall.y
end
elseif “ended” == phase or “cancelled” == phase then
display.getCurrentStage():setFocus( nil )
t.isFocus = false
– Switch body type back to “dynamic”, unless we’ve marked this sprite as a platform
if ( not event.target.isPlatform ) then
event.target.bodyType = “dynamic”
end
end
end
– Stop further propagation of touch event!
return true
end
[/code] [import]uid: 31262 topic_id: 16502 reply_id: 61638[/import]
