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%%
%% wpc_intersect_edge.erl --
%%
%% Plug-in for extending an edge to the intersection with a plane.
%%
%% Copyright (c) 2004-2011 Bjorn Gustavsson.
%%
%% See the file "license.terms" for information on usage and redistribution
%% of this file, and for a DISCLAIMER OF ALL WARRANTIES.
%%
%% Contributed by elrond79.
%%
%% $Id$
%%
%% 2000-10-09: Fixed undo bug (had forgotten to use "{save_state, ...}")
%% 2000-10-01: Incorporated help text suggestions from Puzzled Paul
%% 2000-09-21: Normalized line direction (so lineDotPlane dependant only on
%% angle, not size of LD vector)
%% 2000-09-17: Tried to make more compliant w/ wings API (Paul Molodowitch)
%% 2000-09-17: Allowed more than one edge per body (though none can share
%% verts) and changed method for choosing which vert to move
-module(wpc_intersect_edge).
-export([init/0,menu/2,command/2]).
-include_lib("wpc_intersect.hrl").
-import(lists, [member/2]).
init() ->
true.
menu({edge},Menu) ->
lists:reverse(parse(Menu, [], false));
menu(_,Menu) ->
Menu.
parse([], NewMenu, true) ->
NewMenu;
parse([], NewMenu, false) ->
[menu_item()|NewMenu];
parse([A = {_,{flatten,_}}|Rest], NewMenu, false) ->
parse(Rest, [menu_item(),A|NewMenu], true);
parse([Elem|Rest], NewMenu, Found) ->
parse(Rest, [Elem|NewMenu], Found).
command({edge,{intersect,Plane}},St) ->
intersect(Plane, St);
command(_,_) -> next.
%% creates the menu item for the edge intersect command.
menu_item() ->
{?__(1,"Intersect"),{intersect,fun submenu/2}}.
submenu(help, _) ->
{?__(1,"Intersect std. planes"),
?__(2,"Pick plane and ref point on plane"),
?__(3,"Pick plane")};
submenu(1, _) ->
[standard_planes_menu()];
submenu(2, Ns) ->
wings_menu:build_command({'ASK',{[{axis, ?__(4,"Pick axis perpendicular to plane")},
{point, ?__(5,"Pick point for plane to pass through")}],[],[]}}, Ns);
submenu(3, Ns) ->
wings_menu:build_command({'ASK',{[{axis_point, ?__(6,"Pick axis perpendicular to plane (plane will pass through axis's base)")}],[],[]}}, Ns).
standard_planes_menu() ->
[standard_plane_fun(x),
standard_plane_fun(y),
standard_plane_fun(z),
separator,
standard_plane_fun(last_axis),
standard_plane_fun(default_axis)].
standard_plane_fun(Vec) ->
F = fun(1, Ns) ->
wings_menu:build_command(Vec, Ns);
(2, _Ns) ->
ignore;
(3, Ns) ->
wings_menu:build_command({'ASK',{[point],[Vec]}}, Ns)
end,
VecString = intl_vec(Vec),
if
Vec == last_axis; Vec == default_axis ->
Help0 = ?__(1,"Intersect edge with plane defined by the")++" " ++ VecString;
true ->
PlaneString = case Vec of
x -> "YZ";
y -> "XZ";
z -> "XY"
end,
Help0 = ?__(2,"Intersect edge with the")++" " ++ PlaneString ++ " "++?__(3,"plane")
end,
Help = {Help0,[],?__(4,"Pick point on plane")},
{wings_util:cap(VecString),F,Help,[]}.
intl_vec(last_axis) -> ?__(1,"last axis");
intl_vec(default_axis) -> ?__(2,"default axis");
intl_vec(Vec) -> wings_util:stringify(Vec).
%%%
%%% The edge Intersect command.
%%%
intersect({'ASK',Ask}, St) ->
wings:ask(Ask, St, fun intersect/2);
intersect({Plane,Center}, St) ->
intersect(Plane, Center, St);
intersect(Plane, St) when Plane == last_axis; Plane == default_axis ->
{Center, Normal} = wings_pref:get_value(Plane),
intersect(Normal, Center, St);
intersect(Plane, St) ->
intersect(Plane, origin, St).
intersect(Plane, origin, St) ->
intersect(Plane, {0.0,0.0,0.0}, St);
intersect(Plane0, Center, St) ->
Plane = e3d_vec:norm(wings_util:make_vector(Plane0)),
ValidSelection = wpa:sel_fold(fun validateSel/3, valid, St),
case ValidSelection of
valid ->
{save_state,
wpa:sel_map(
fun(Es, We) ->
intersect_body(Es, Plane, Center, We)
end, St)};
invalid ->
wpa:error_msg(?__(1,"Selected edges may not share any vertices")),
keep
end.
validateSel(Edges, We, valid) when is_list(Edges) ->
validateSelAcc(Edges, We#we.es, []);
validateSel(Edges, We, valid) ->
validateSel(gb_sets:to_list(Edges), We, valid);
validateSel(_Edges, _We, invalid) ->
invalid.
validateSelAcc([],_,_VertexAcc)->
valid;
validateSelAcc([SelEdge|OtherSelEdges], EdgeTab, VertexAcc) ->
#edge{vs=V1,ve=V2} = array:get(SelEdge,EdgeTab),
InTable = member(V1,VertexAcc) orelse member(V2,VertexAcc),
case InTable of
true ->
invalid;
false ->
validateSelAcc(OtherSelEdges, EdgeTab, [V1,V2|VertexAcc])
end.
intersect_body(Edges, Plane, Center, #we{es=EdgeTab,vp=VertPosTab0}=We0) when is_list(Edges) ->
VertPosTab = intersect_edges(Plane, Center, EdgeTab, VertPosTab0, Edges),
We = We0#we{vp = VertPosTab},
wings_we:mirror_flatten(We0, We);
intersect_body(Edges, Plane, Center, We) ->
intersect_body(gb_sets:to_list(Edges), Plane, Center, We).
intersect_edges(_Plane,_Center,_EdgeTab,VertPosTab,[]) ->
VertPosTab;
intersect_edges(Plane,Center,EdgeTab,VertPosTab0,[EdgeNum|OtherEdgeNums]) ->
#edge{vs=V1Num,ve=V2Num}=array:get(EdgeNum,EdgeTab),
V1 = array:get(V1Num,VertPosTab0),
V2 = array:get(V2Num,VertPosTab0),
V1V2 = e3d_vec:norm_sub(V2,V1),
LineDotPlane = e3d_vec:dot(V1V2,Plane),
if
abs(LineDotPlane) < 0.001 ->
wpa:error_msg(?__(1,"Line and plane are nearly parallel:\n"
"can't find intersection.")),
VertPosTab = VertPosTab0;
true ->
%% First, see if V1 and V2 are on same side of plane;
%% if so, move the closer one.
CenterV1 = e3d_vec:sub(V1,Center),
CenterV2 = e3d_vec:sub(V2,Center),
V1Dist = e3d_vec:dot(CenterV1,Plane),
V2Dist = e3d_vec:dot(CenterV2,Plane),
%% If the distances have the same sign, means on same side;
if
V1Dist * V2Dist >= 0 ->
if
abs(V1Dist) < abs(V2Dist) ->
VToMove = V1Num;
true ->
VToMove = V2Num
end;
true ->
%% If they are on opposite sides, move the one on
%% the opposite side of the normal.
if
V1Dist > V2Dist ->
VToMove = V2Num;
true ->
VToMove = V1Num
end
end,
IntersectData = #intersect_data{lineDir = V1V2, linePoint = V1,
planeNorm = Plane, planePoint = Center,
lineDotPlane = LineDotPlane},
VertPosTab = wpc_intersect_vertex:intersect_vertex(VToMove, VertPosTab0, IntersectData)
end,
intersect_edges(Plane,Center,EdgeTab,VertPosTab,OtherEdgeNums).
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