How could I make this more efficent?

Getting Started Newbie Questions
#1 
local function draggable(event) local target = event.target if event.phase == "began" then target.markX = target.x -- store x location of object target.markY = target.y -- store y location of object elseif event.phase == "moved" then local x = (event.x - event.xStart) + target.markX local y = (event.y - event.yStart) + target.markY target.x, target.y = x, y -- move object based on calculations above end return true end object:addEventListener("touch",draggable)

It loses the target if you move too fast and it interferes with other objects with this event is attached to.

#2

Putting target:toFront() helps makes it interfere less with other object it seems but it still loses focus of the object if you drag too fast

#3

You need to set focus to ensure the event listener keeps receiving the events for that object and you’d be much better off with a table listener.

Read this:

https://docs.coronalabs.com/daily/api/type/StageObject/setFocus.html

This is closer to what you want:

local function ( self, event ) local eventID = event.id if(event.phase == "began") then display.getCurrentStage():setFocus( self ) self.isFocus = true self.x0 = self.x self.y0 = self.y elseif(self.isFocus) then self.x= self.x0 + event.x - event.xStart self.y = self.y0 + event.y - event.yStart if(event.phase == "ended") then display.getCurrentStage():setFocus( nil ) self.isFocus = false end end return true end local dragObj = display.newCircle( 100, 100, 30 ) dragObj.touch = touch dragObj:addEventListener( "touch" )
#4

Thanks.

#5

Putting target:toFront() helps makes it interfere less with other object it seems but it still loses focus of the object if you drag too fast

#6

You need to set focus to ensure the event listener keeps receiving the events for that object and you’d be much better off with a table listener.

Read this:

https://docs.coronalabs.com/daily/api/type/StageObject/setFocus.html

This is closer to what you want:

local function ( self, event ) local eventID = event.id if(event.phase == "began") then display.getCurrentStage():setFocus( self ) self.isFocus = true self.x0 = self.x self.y0 = self.y elseif(self.isFocus) then self.x= self.x0 + event.x - event.xStart self.y = self.y0 + event.y - event.yStart if(event.phase == "ended") then display.getCurrentStage():setFocus( nil ) self.isFocus = false end end return true end local dragObj = display.newCircle( 100, 100, 30 ) dragObj.touch = touch dragObj:addEventListener( "touch" )
#7

Thanks.