Object Table - Objects are invisible

Games
#1

Hi, I’m using the code from the blog post (how to spawn objects).

The objects are acting as they should, and collision events are firing and responding normally. However, I can’t see the object itself. I’ve explicitly set isVisible=true and alpha=1, it’s still transparent though.

I was originally just building the platform object myself, not inside a table or function, and this worked as expected. This leads me to believe it’s an issue with the object table.

Code is below:

 -- Spawn a platform  
 function spawnPlatform(params)  
 local object = display.newImage( "platform.png" )  
  
 -- Set the objects table to a table passed in by parameters  
 object.objTable = params.objTable  
 -- Automatically set the table index to be inserted into the next available table index  
 object.index = #object.objTable + 1  
  
 -- Give the object a custom name  
 object.myName = "Platform : " .. object.index  
  
 -- Make is visible  
 object.alpha = 1  
 object.isVisible = true  
  
 -- Position  
 object.x = params.x  
 object.y = params.y  
  
 -- Set as physics object  
 physics.addBody( object, "static", { friction=0.3, isSensor=true } )   
  
 -- The objects group  
 object.group = params.group or localGroup  
  
 -- If the function call has a parameter named group then insert it into the specified group  
 object.group:insert(object)  
  
 -- Insert the object into the table at the specified index  
 object.objTable[object.index] = object  
  
 return object  
 end  
  
 platforms = spawnPlatform(  
 {  
 objTable = platformsTable,  
 x = 120,  
 y = 350,  
 group = localGroup  
 }  
 )  
  
  
 local function onPlatformCollision( event )   
 vx, vy = man:getLinearVelocity()  
 if vy \> 0 then  
 man:setLinearVelocity( 0, 0 )  
 man:applyLinearImpulse(0, -0.6, man.x, man.y)   
 end   
 end

On collision my character jumps on the platform, but it’s simply not visible. I have also tried explicitly setting the height (which I have removed from the code above), still no dice though.

Any help is hugely appreciated.

Thanks [import]uid: 61422 topic_id: 15438 reply_id: 315438[/import]

#2

Obviously I can’t test with that code, however I was wondering whether or not you are inserting everything into localGroup, or just some images, like your platforms - but not your background?

Is it possible that the images aren’t invisible but are simply behind your background. (You can find this out quickly by briefly setting your background to a low alpha.)

If so, consider using toFront() on your platforms.

Otherwise, for trouble shooting purposes, could you use a few print statements to ensure things are being set as you’ve intended?

Peach :slight_smile: [import]uid: 52491 topic_id: 15438 reply_id: 57089[/import]

#3

Looks like my background was being thrown infront of it, due to the order of my statements.

Thanks [import]uid: 61422 topic_id: 15438 reply_id: 57090[/import]

#4

No worries; glad I could help get it sorted :slight_smile: [import]uid: 52491 topic_id: 15438 reply_id: 57231[/import]