How do you prevent a draggable object from being dragged too fast?

I have a draggable object (my player) that must be dragged past spawning enemies to progress in the game. The problem is, if the person playing the game "swipes" the draggable object very quickly, the player actually passes through enemies without triggering any collisions. Is there any way to sense when the draggable object is being swiped, or zipped from one point to another? I'm thinking of something like:

local function distanceChecker()
if distanceTravelled > [[insert number]] then
player:play('stumble and trip animation')
end
Runtime:addEventListener("something that fires every frame", distanceChecker)

All I know is that setting a physics object to isBullet makes the collisions more accurate

myBody.isBullet = true

read this

(http://blog.anscamobile.com/2011/08/solutions-to-common-physics-challenges/)

you can try using a touch joint to move and set the frequency or dampening (not sure which one) to drag slower

find the Debug Draw sample in templates->physics

Thanks for putting that out there, ernests.

I tried using .isBullet, but unfortunately it doesn't make a difference.

To anyone out there, if you can change the following code so the circle turns red even with the fastest swipe, you will have solved my problem. Here's my test code:

local physics = require("physics")
physics.start()
physics.setGravity(0, 0)
 
local player = display.newCircle(384,1000,20)
physics.addBody(player,"kinematic")
 
--Player movement function
local function onTouch( event )
        local player = event.target     
        local phase = event.phase
        if "began" == phase then
                -- Make target the top-most object
                local parent = player.parent
                parent:insert( player )
                display.getCurrentStage():setFocus( player )
                player.isFocus = true
                -- Store initial position
                player.x0 = event.x - player.x
                player.y0 = event.y - player.y
        elseif player.isFocus then
                if "moved" == phase then
                        player.x = event.x - player.x0
                        player.y = event.y - player.y0                                             
                end
        end   
        return true             
end
player:addEventListener( "touch", onTouch )
 
--Enemy spawn function
local function enemySpawn (event)  
  local enemy = display.newRect(20,20,300,100)
  enemy.x = -300
  enemy.y = 512
  physics.addBody(enemy,"dynamic",{isSensor = true})
  enemy.isSensor = true
  transition.to(enemy,  {time = 3000, delay = 0, x = enemy.x + 1368, onComplete=function() enemy :removeSelf() end}) 
end
timer.performWithDelay(850,enemySpawn,0)
 
 --Collision function    
local function onPlayerCollision()
        player:setFillColor(255,0,0)
    print("collided with enemy")
end
player:addEventListener("collision",onPlayerCollision)

views:1584 update：2011/10/22 9:46:13


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