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iso trajectory problem

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Howdy Folks, I have an isometric game in which you can aim a ship''s cannon and then set the angle in a format somewhat similar to movement in games like homeworld. I''ve come up with several ad hoc solutions, but none that seem to work convincingly. Is there a correct way to approach this? I apologize if this is a common problem, I have never used this forum before. -dave

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you only need to be concerned by two things: having a function to convert iso screencoords to 2d worldcoords, and vice versa.
then you can do all your calculations in unskewed/rotated 2d worldspace, and the problem becomes considerably easier.

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