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Getting destination with an angle

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Ive been trying to figure out how to get destination points given a certain angle. I''ve been using sin and cos for amounts moved, but Im having a problem finding edge destinations. For example, I have a ship on the screen, and it is facing at any angle (0-360), how would I check where a line from the ship intersects the edge of the screen? My res. is 1024x768. My brain is fried, any help is appreciated. Thanks- Jeff

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Solve the equations :

left edge : x = 0
ship : x = x0 + t.cos(a), y = y0 + t.sin(a)

solve for t, that gives you the intersection with the left edge.

Lather, rinse, repeat.

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