[vJASS] Mouse Screen Position: Field of View

[loktar]

There's a problem with [vJASS] - ScreenMouse where relative X values are larger at the top of the screen than at the bottom of the screen. This is because a wider area is shown the further you get away from the camera source, determined by the field of view angle. So the larger the field of view, the bigger this discrepancy gets.

I can't seem to figure out how to solve this. The best I've come up with is the following, which doesn't work:

        if difX > 0 then
            set difX = difX - Tan(GetCameraField(CAMERA_FIELD_FIELD_OF_VIEW)/2)*difY
        elseif difX < 0 then
            set difX = difX + Tan(GetCameraField(CAMERA_FIELD_FIELD_OF_VIEW)/2)*difY
        endif

If I'm correct, it doesn't work because I'm just adding/subtracting a flat value from difX, whereas I need to multiply by a ratio. But I can't think of a way to get that ratio.

Any ideas? Thanks.

 

[IcemanBo]

No real solution idea, only that the cam's view isn't a rect, but more like a trapeze and depending like cam's AngleOfAttack. Scrolling with mouse for example could extremely change the discprepancy. And it's probably why there isn't a native to get such min/max values.

You could try to calculate the AoA discrepancy, and then yes, too, also probably FoA needs to be considered for each player. And also then, not sure it would work flawlessly. :/

 

[loktar]

I figure there must be a constant viewport size, from which theoretically one could get the visible map area after accounting for field of view and camera target distance. I think that may be the only way of projecting the x position from the visible trapeze to a rectangle.