calculate on screen position in a snapshot

Audio and Graphics
#1

Hi,

Is there a calculation for determining the actual onscreen position for an object in a snapshot?  

for example, in the screenshot attached I want to spawn objects to move towards the ship, but I need to make sure they move at the same speed of the lines so need to know the onscreen position of one of the lines so as the object moves with it towards the ship.

Thanks

#2

The red area is a warped snapshot, I’m trying to spawn an object on the red area but with a 2d coordinate relative to the screen not the snapshot.  I have tried localtocontent but this just gets the xy of the lines within the warped screen shot not their positions relative to the screen.

I have found calculations which require a Z coordinate to work it out but as corona doesn’t do Z axis there must be another way as I have seen examples of this being done.

Any help appreciated.

#3

The red area is a warped snapshot, I’m trying to spawn an object on the red area but with a 2d coordinate relative to the screen not the snapshot.  I have tried localtocontent but this just gets the xy of the lines within the warped screen shot not their positions relative to the screen.

I have found calculations which require a Z coordinate to work it out but as corona doesn’t do Z axis there must be another way as I have seen examples of this being done.

Any help appreciated.