Is there a lazy way to do this in Gideros?

Tom2012 · November 2012

To make an object follow the mouse pointer around?

Or is it going to be trig, and atan2?

Thanks

Tom

ar2rsawseen · November 2012

@Tom2012 do you mean Mouse/touch move and simply setting coordinates of cursor to object?

OZApps · November 2012

The laziest way to do so would be a tween for every new point of touch with a small duration for the tween. However if you need to rotate it, etc, then you have a bit more work cut out.

techdojo · November 2012

Just create a table of 10 or 20 slots, initially fill each one with the starting mouse position, then each time you get a mouse move event, move all the elements in the list down by 1 and put the new position in the top slot, then just set your object position to the last element.

The longer the table, the greater the distance the object will lag but it will always eventually end up in the right position.

local posTable
local cx,cy                     -- current (intial) mouse value
 
-- setup
posTable={}
for i=1,20 do
   posTable[i] = {cx,cy}
end
 
 
-- each time
for i=20,2,-1 do
   posTable[i] = posTable[i-1]
end
 
posTable[1] = {cx,cy}
 
object:setPosition(posTable[20])

or something like that.
You can use atan2() to get the angle to the mouse if you need to.

@OZApps - even lazier!

ar2rsawseen · November 2012

Or if you are using Box2d, you can use mouse joint and adjust maxForce, frequencyHz, dampingRatio to achieve required result

plamen · November 2012

@ar2rsawseen, awesome! my kind a move

gangnam style

Tom2012 · November 2012

Thanks everyone. I coded what I needed and have posted in snippets.

http://www.giderosmobile.com/forum/discussion/2122/make-a-character-move-to-a-mouse-or-touch-then-stop#Item_1

OZApps · November 2012

Just create a table of 10 or 20 slots, initially fill each one with the starting mouse position, then each time you get a mouse move event, move all the elements in the list down by 1 and put the new position in the top slot, then just set your object position to the last element.
@OZApps - even lazier!

@techdojo, what are you writing a Gideros version of the old retro Snake?

techdojo · November 2012

Now that gives me an idea ....

Scouser · November 2012

Here comes another started & never to be finished project by @techdojo

)

techdojo · November 2012

Thank you @Scouser for neatly jumping hook line and sinker on that little bit of bait I left for you.

You never fail to bite

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