Changing a Display object

Solar2D General Questions/Discussion
#1

Hi!

Is it possible to somehow change a display object once it has been created?

Basically I have a simple object like so:

local player = display.newImageRect(“Images/player1.png”, 50,50 );

and a touch event listener associated with it. What I want to do is change player to be a different shape within that touch handler.

I can simply remove the object and create a new one, but I lose the reference in the display group, which I need to keep…

Background: I have three lua files - menu, level and player, and I’m using the director ‘class’ to change scenes. The menu class creates a set number of players (from the player class), and passes them into the new method of the level class as parameters. The level class then creates a display group, and adds the players from the parameters. Passing the display group that is created in the level class starts to get messy at this point…

As you can probably guess, I’m from an OO background, rather than script, so I may be going about this the wrong way

so yeah, any help appreciated…thanks! [import]uid: 131065 topic_id: 23927 reply_id: 323927[/import]

#2

The best way to do this is probably using the Movieclip.lua library (found in the Sample code).

You load in X number of images, in this case, probably two, one for the pre-touch and one for the post-touch. Movieclip produce a display object just like display.newImageRect does, in that you can move it, scale it, rotate it etc.

But in this usage, we are only going to play one frame at a time depending on which image you need to show:

  
local movieclip = require "movieclip"  
  
local player = movieclip.newAnim({"frame1.png", "frame2.png"})  
player:play({startFrame=1,endFrame=1,loop=1,remove=false})  
local function changePlayer(event)  
 if event.phase == "ended" then  
 event.target:play({startFrame=2,endFrame=2,loop=1,remove=false})  
 end  
 return true  
end  
  
player:addEventListener("touch", changePlayer)

or if you want to toggle on touch:

[code]

local movieclip = require “movieclip”

local player = movieclip.newAnim({“frame1.png”, “frame2.png”})
player.currentFrame = 1
player:play({startFrame=player.currentFrame, endFrame=player.currentFrame, loop=1, remove=false})
local function changePlayer(event)
if event.phase == “ended” then
local cf = event.target.currentFrame + 1
if cf > 2 then
cf = 1
end
event.target:play({startFrame=cf, endFrame=cf, loop=1, remove=false})
end
return true
end

player:addEventListener(“touch”, changePlayer)
[/code] [import]uid: 19626 topic_id: 23927 reply_id: 96392[/import]

#3

oooh, that looks pretty handy, as I want to have lots of different display objects…

…however, will the movie clip handle physics objects?

Sorry. I should have said in the first post. Each object will have a physics body…

Will that make a difference?

(and thanks by the way!) [import]uid: 131065 topic_id: 23927 reply_id: 96400[/import]