Viewport Y-offset - how to find it?

Viewport Y-offset - how to find it? - Printable Version

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+--- Thread: Viewport Y-offset - how to find it? (/showthread.php?tid=298)

Viewport Y-offset - how to find it? - micheus - 04-27-2013

I need to make my own "vertex select" routine for a new plugin. So, I create some functions based on those already existent in Wings. The find_vertex converts the 3D coordinate into 2D (viewport coordinates).

The problem is that I'm always getting the Y coordinated with an offset of 75px. This is exactly the height used by title bar+menu bar+button bar by using only the default Geom window.

[Image: geom-win-offset_zps1332bacb.png]

I couldn't find the "magic" at Wings3d code. Can someone help me?

Code:
...

    {GX,GY} = wings_wm:local2global(X, Y),

    Mode = case raw_pick(GX,GY,Vs) of

...

raw_pick(X0, Y0, Vs0) ->

    Trans = wings_u:get_matrices(0, original), % fake call for ID=0 as we force original for MM parameter

    Vs = lists:sort(find_vertex(Vs0, X0, Y0, Trans)),

    [{Vdist0,{_Xva,_Yva},_V},{_,{_Xvb,_Yvb},_}|_] = Vs,

    Vdist = math:sqrt(Vdist0),

    (Vdist =< 2.0).

find_vertex(Vs, X, Y, {_,_,{_,_,W,H}}=Trans) ->

    lists:map(fun(#vl{v=V}) ->

        {Xs,Ys} = Pos = project_vertex(V, Trans),

        io:format("  Xs,Ys (~p,~p)\n",[Xs,H-Ys]),

        Dx = X-Xs,

        Dy = Y-Ys,

        {Dx*Dx+Dy*Dy,Pos,V}

    end, Vs).

RE: Viewport Y-offset - how to find it? - micheus - 04-28-2013

Well, after lot of tries I found it...

I added the call to global2local function:

Code:
find_vertex(Vs, X, Y, {_,_,{_,_,W,H}}=Trans) ->

    lists:map(fun(#vl{v=V}) ->

        {X0,Y0} = project_vertex(V, Trans),

        {Xs,Ys} = Pos = wings_wm:global2local(X0,Y0),  <<==

        Dx = X-Xs,

        Dy = Y-Ys,

        {Dx*Dx+Dy*Dy,Pos,V}

    end, Vs).

Now, both Y's values uses the same 75px offset.

RE: Viewport Y-offset - how to find it? - bmulder - 03-18-2014

Viewport Y-offset

Thanks guys.I went surfing the net blue for this information till a friend advised my to try wings3d.com.
Will give code it a try a give feedback