have 2 attributes clickx and clicky and have them real. Then make a actor turn its alpha to zero and drag it so it covers the whole scene. Then in that actor have when touch is pressed change attribute click x to touch1x and change attribute clicky to touch 1 y.
So whenever you touch anywhere on the screen clickx and clicky will be update to the last touch.
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So whenever you touch anywhere on the screen clickx and clicky will be update to the last touch.