How can I rotate a layer 180 degrees?

[anddrewscott]

Code: Select all

1. MOAISim.openWindow ( "layer rotation", 320, 480 )


2.  


3. viewport = MOAIViewport.new ()


4. viewport:setSize ( 320, 480 )


5. viewport:setScale ( 320, -480 )


6.  


7. layer = MOAILayer2D.new ()


8. layer:setViewport ( viewport )


9. MOAISim.pushRenderPass ( layer )


10.  


11. gfxQuad = MOAIGfxQuad2D.new ()


12. gfxQuad:setTexture ( "moai.png" )


13. gfxQuad:setRect ( 0, 0, 128, 128 )


14. gfxQuad:setUVRect ( 0, 0, 1, 1 )


15.  


16. prop = MOAIProp2D.new ()


17. prop:setDeck ( gfxQuad )


18. layer:insertProp ( prop )


19.  

I am trying to rotate a layer by 180 degrees but am not having much success.

Code: Select all

1. layer:setPiv(160, 240)


2. layer:seekRot ( 180, 1 )

I tried the code above (set pivot point at the centre of the screen and then rotate. The prop is seen to expand and then shrink. This transformation leaves no changes.

Code: Select all

1. layer:seekRot ( 180, 1 )


2. layer:seekLoc(320, 480, 1)

(The second line of the code above is to move the layer back in to the screen as the prop 'rotates off' the screen.)
In the code above the prop is seen to loop around but not rotate. Again this transformation leaves no changes once it has finished.

Could anyone help me with this?

[nosheet]

I haven't tried to rotate layers yet, but usually if I wanted to group objects I would create MOAITransform object and assign it as a parent to props I want to group. Not sure if this would be helpful in your case.
Another thing, you say the prop shrinks and expands - could it be that you are actually rotating a layer but around x axis in 3d space, and since you have ortho view it looks confusing? I am asking this because I had some problems where rotation would sometimes unexplainably work only in 2D, although given 4 parameters (I was trying to rotate in 3d at the time), so maybe the opposite could be true (although not likely)?

[sgeos]

I haven't tried to rotate layers yet, but usually if I wanted to group objects I would create MOAITransform object and assign it as a parent to props I want to group.

This is what I am doing. I set one object to be the parent, and then children then move relative to the parent.

Code: Select all

1. local result = MOAIProp2D.new()


2. result:setDeck( pTileset )


3. result:setAttr( MOAIProp2D.ATTR_INDEX, pIndex )


4. result:setParent( pParent )


5. result:setPiv( pPivot.x, pPivot.y )


6. result:setLoc( pOffset.x, pOffset.y )


7. return result