The FXScript Reference

Point.x and Point.y are interchangable with Point.h and Point.v. These can even be mixed within the same function such as {x,v} and {h,y}.

When declared as an argument for a subroutine, points are able to be modified where float values seem to be read-only.

Final Cut Pro places the center of the coordinate system in the center of the image. This means that a point {0,0} is at the center of the canvas and {-360,-240} will be top left in an NTSC timeline.

You can test this with the BoundsOf function. For the 320x240 FXBuilder test window, BoundsOf(dest, poly) returns the following coordinates:

Top left: {-160, -120}
Top right: {160, -120}
Bottom right: {160, 120}
Bottom left: {-160, 120}

As you can see, FCP drops either point {0,0} or somethings else is wrong, because this poly actually describes a 321x241 rectangle.