I want to have an object move along a continuous predefined line. The line may be around another object or just across the game board. I thought I say a tutorial for this some time ago but I am not able to find it now.
Does anyone have any suggested code for how to do this OR does anyone know if there is a tutorial on this?
Thanks,
Lori
Perhaps this is what you were looking for: http://coronalabs.com/blog/2014/01/07/tutorial-moving-objects-along-a-path/
Rob
That is the one I was looking for. Thank you!
I set up my object to move the same as in the tutorial. My object has four basic lines I want it to follow and then I want it to repeat that same four lines continuously during the level being played.
Is there a way I can make it repeat without having to input a zillion movePath[#] rows?
I’ve been trying various things but nothing is working for me.
Thanks
I would put an onComplete to restart it.
Rob
Where do I send it to restart? I tried onComplete = restart and onComplete = setPath
Thanks
Lori
Generally you probably should have your transitions inside a function, perhaps something like this:
local function moveIt()
… your transition code here:
transition.to(…, {…, onComplete = moveIt} )
end
Below is the code I’m using: When I added the function (see blue) the transition did not start - not even one rotation. I know this is basic but I’m not getting it. Thanks
local movePath = {}
movePath[1] = { x=680, y=253, time=8000 }
movePath[2] = { x=680, y=840, time=8000 }
movePath[3] = { x=105, y=840, time=8000 }
movePath[4] = { x=105, y=253, time=8000 }
movePath[5] = { x=384, y=253, time=8000 }
local function distBetween( x1, y1, x2, y2 )
local xFactor = x2 - x1
local yFactor = y2 - y1
local dist = math.sqrt((xFactor*xFactor) + (yFactor*yFactor))
return dist
end
local function setPath( object, path, params )
local delta = params.useDelta or nil
local deltaX = 0
local deltaY = 0
local constant = params.constantTime or nil
local ease = params.easingMethod or easing.linear
local tag = params.tag or nil
local delay = params.delay or 0
local speedFactor = 1
if ( delta and delta == false ) then
–if delta = true, the object’s path will be relative to its starting position
–if dealta = false or ommitted, the path points will be explicit screen positions
deltaX = object.x
deltaY = object.y
end
if ( constant ) then
–this sets a constant rate of movement
local dist = distBetween( object.x, object.y, deltaX+path[1].x, deltaY+path[1].y )
speedFactor = constant/dist
end
for i = 1,#path do
local segmentTime = 500
–if “constant” is defined, refactor transition time based on distance between points
if ( constant ) then
local dist
if ( i == 1 ) then
dist = distBetween( object.x, object.y, deltaX+path[i].x, deltaY+path[i].y )
else
dist = distBetween( path[i-1].x, path[i-1].y, path[i].x, path[i].y )
end
segmentTime = dist*speedFactor
else
–if this path segment has a custom time, use it
if ( path[i].time ) then segmentTime = path[i].time end
end
–if this segment has custom easing, override the default method (if any)
if ( path[i].easingMethod ) then ease = path[i].easingMethod end
function moveIt()
moveHole = transition.to( object, { tag=tag, time=segmentTime, x=deltaX+path[i].x, y=deltaY+path[i].y, delay=delay, transition=ease, onComplete=moveIt** } )**
delay = delay + segmentTime
end
end
end
setPath(pocket1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag=“moveObject” } )
setPath(pocketSensor1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag=“moveObject” } )
Can you repost your code inside of and tags (no space after the [). This will make it easier to read your code.
Rob
OK…but I’m not sure what you are asking. Is it a different place I upload the code?
Thanks
How are you putting your code in your post now?
cut and paste from TexMate
Then type: into the forum screen (leave the space out, I can't type it without it turning into the tag), paste your code and then type: (again leave the space out).
That will cause it to preserve your indentions and provide syntax highlighting, etc. It’s important formatting for people trying to help you.
Rob
local movePath = {} movePath[1] = { x=680, y=253, time=8000 } movePath[2] = { x=680, y=840, time=8000 } movePath[3] = { x=105, y=840, time=8000 } movePath[4] = { x=105, y=253, time=8000 } movePath[5] = { x=384, y=253, time=8000 } local function distBetween( x1, y1, x2, y2 ) local xFactor = x2 - x1 local yFactor = y2 - y1 local dist = math.sqrt((xFactor\*xFactor) + (yFactor\*yFactor)) return dist end local function setPath( object, path, params ) local delta = params.useDelta or nil local deltaX = 0 local deltaY = 0 local constant = params.constantTime or nil local ease = params.easingMethod or easing.linear local tag = params.tag or nil local delay = params.delay or 0 local speedFactor = 1 if ( delta and delta == false ) then --if delta = true, the object's path will be relative to its starting position --if dealta = false or ommitted, the path points will be explicit screen positions deltaX = object.x deltaY = object.y end if ( constant ) then --this sets a constant rate of movement local dist = distBetween( object.x, object.y, deltaX+path[1].x, deltaY+path[1].y ) speedFactor = constant/dist end for i = 1,#path do local segmentTime = 500 --if "constant" is defined, refactor transition time based on distance between points if ( constant ) then local dist if ( i == 1 ) then dist = distBetween( object.x, object.y, deltaX+path[i].x, deltaY+path[i].y ) else dist = distBetween( path[i-1].x, path[i-1].y, path[i].x, path[i].y ) end segmentTime = dist\*speedFactor else --if this path segment has a custom time, use it if ( path[i].time ) then segmentTime = path[i].time end end --if this segment has custom easing, override the default method (if any) if ( path[i].easingMethod ) then ease = path[i].easingMethod end moveHole = transition.to( object, { tag=tag, time=segmentTime, x=deltaX+path[i].x, y=deltaY+path[i].y, delay=delay, transition=ease, onComplete=moveIt}) delay = delay + segmentTime end end setPath(pocket1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } ) setPath(pocketSensor1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } )I hope that was right
It still lost the indentions…
I will try again. If it still doesn’t work - I will post again and manually put in the indentions. Thanks for your patience.
local movePath = {} movePath[1] = { x=680, y=253, time=8000 } movePath[2] = { x=680, y=840, time=8000 } movePath[3] = { x=105, y=840, time=8000 } movePath[4] = { x=105, y=253, time=8000 } movePath[5] = { x=384, y=253, time=8000 } local function distBetween( x1, y1, x2, y2 ) local xFactor = x2 - x1 local yFactor = y2 - y1 local dist = math.sqrt((xFactor\*xFactor) + (yFactor\*yFactor)) return dist end local function setPath( object, path, params ) local delta = params.useDelta or nil local deltaX = 0 local deltaY = 0 local constant = params.constantTime or nil local ease = params.easingMethod or easing.linear local tag = params.tag or nil local delay = params.delay or 0 local speedFactor = 1 if ( delta and delta == false ) then --if delta = true, the object's path will be relative to its starting position --if dealta = false or ommitted, the path points will be explicit screen positions deltaX = object.x deltaY = object.y end if ( constant ) then --this sets a constant rate of movement local dist = distBetween( object.x, object.y, deltaX+path[1].x, deltaY+path[1].y ) speedFactor = constant/dist end for i = 1,#path do local segmentTime = 500 --if "constant" is defined, refactor transition time based on distance between points if ( constant ) then local dist if ( i == 1 ) then dist = distBetween( object.x, object.y, deltaX+path[i].x, deltaY+path[i].y ) else dist = distBetween( path[i-1].x, path[i-1].y, path[i].x, path[i].y ) end segmentTime = dist\*speedFactor else --if this path segment has a custom time, use it if ( path[i].time ) then segmentTime = path[i].time end end --if this segment has custom easing, override the default method (if any) if ( path[i].easingMethod ) then ease = path[i].easingMethod end moveHole = transition.to( object, { tag=tag, time=segmentTime, x=deltaX+path[i].x, y=deltaY+path[i].y, delay=delay, transition=ease, onComplete=moveIt}) delay = delay + segmentTime end end setPath(pocket1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } ) setPath(pocketSensor1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } )I don’t know why your indentions are not working, but don’t manually fix it. Let me look.
Rob
I tried to manually space it below. I appreciate your trying to help.
local movePath = {}
movePath[1] = { x=680, y=253, time=8000 }
movePath[2] = { x=680, y=840, time=8000 }
movePath[3] = { x=105, y=840, time=8000 }
movePath[4] = { x=105, y=253, time=8000 }
movePath[5] = { x=384, y=253, time=8000 }
local function distBetween( x1, y1, x2, y2 )
local xFactor = x2 - x1
local yFactor = y2 - y1
local dist = math.sqrt((xFactor*xFactor) + (yFactor*yFactor))
return dist
end
local function setPath( object, path, params )
local delta = params.useDelta or nil
local deltaX = 0
local deltaY = 0
local constant = params.constantTime or nil
local ease = params.easingMethod or easing.linear
local tag = params.tag or nil
local delay = params.delay or 0
local speedFactor = 1
if ( delta and delta == false ) then
--if delta = true, the object’s path will be relative to its starting position
--if delta = false or ommitted, the path points will be explicit screen positions
deltaX = object.x
deltaY = object.y
end
if ( constant ) then
--this sets a constant rate of movement
local dist = distBetween( object.x, object.y, deltaX+path[1].x, deltaY+path[1].y )
speedFactor = constant/dist
end
for i = 1,#path do
local segmentTime = 500
--if “constant” is defined, refactor transition time based on distance between points
if ( constant ) then
local dist
if ( i == 1 ) then
dist = distBetween( object.x, object.y, deltaX+path[i].x, deltaY+path[i].y )
else
dist = distBetween( path[i-1].x, path[i-1].y, path[i].x, path[i].y )
end
segmentTime = dist*speedFactor
else
--if this path segment has a custom time, use it
if ( path[i].time ) then segmentTime = path[i].time end
end
--if this segment has custom easing, override the default method (if any)
if ( path[i].easingMethod ) then ease = path[i].easingMethod end
function moveIt()
moveHole = transition.to( object, { tag=tag, time=segmentTime, x=deltaX+path[i].x, y=deltaY+path[i].y, delay=delay, transition=ease, onComplete=moveIt})
delay = delay + segmentTime
end
end
end
setPath(pocket1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag=“moveObject” } )
setPath(pocketSensor1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag=“moveObject” } )
Just as an FYI, always use the and tags, even when you’re hand indenting your code.
Anyway, I don’t see an easy way to solve this. Since you’re setting 8 total seconds, perhaps it’s best to use a timer:
local pocket1Timer = timer.performWithDelay(8000, function() setPath(pocket1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } ) setPath(pocketSensor1, movePath, { useDelta=true, constantTime=8000, easingMethod=easing.inOutQuad, delay=200, tag="moveObject" } ) end, 0)