diff options
Diffstat (limited to 'lib/percept/src/egd_render.erl')
| -rw-r--r-- | lib/percept/src/egd_render.erl | 664 |
1 files changed, 0 insertions, 664 deletions
diff --git a/lib/percept/src/egd_render.erl b/lib/percept/src/egd_render.erl deleted file mode 100644 index 6c708e3e86..0000000000 --- a/lib/percept/src/egd_render.erl +++ /dev/null @@ -1,664 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2008-2016. All Rights Reserved. -%% -%% Licensed under the Apache License, Version 2.0 (the "License"); -%% you may not use this file except in compliance with the License. -%% You may obtain a copy of the License at -%% -%% http://www.apache.org/licenses/LICENSE-2.0 -%% -%% Unless required by applicable law or agreed to in writing, software -%% distributed under the License is distributed on an "AS IS" BASIS, -%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -%% See the License for the specific language governing permissions and -%% limitations under the License. -%% -%% %CopyrightEnd% - -%% -%% @doc egd_render -%% - --module(egd_render). - --export([binary/1, binary/2]). --export([eps/1]). --compile(inline). - --export([line_to_linespans/3]). - --include("egd.hrl"). --define('DummyC',0). - -binary(Image) -> - binary(Image, opaque). - -binary(Image, Type) -> - parallel_binary(precompile(Image),Type). - -parallel_binary(Image = #image{ height = Height },Type) -> - case erlang:min(erlang:system_info(schedulers), Height) of - 1 -> - % if the height or the number of schedulers is 1 - % do the scanlines in this process. - W = Image#image.width, - Bg = Image#image.background, - Os = Image#image.objects, - erlang:list_to_binary([scanline(Y, Os, {0,0,W - 1, Bg}, Type) - || Y <- lists:seq(1, Height)]); - Np -> - Pids = start_workers(Np, Type), - Handler = handle_workers(Height, Pids), - init_workers(Image, Handler, Pids), - Res = receive_binaries(Height), - finish_workers(Pids), - Res - end. - -start_workers(Np, Type) -> - start_workers(Np, Type, []). - -start_workers( 0, _, Pids) -> Pids; -start_workers(Np, Type, Pids) when Np > 0 -> - start_workers(Np - 1, Type, [spawn_link(fun() -> worker(Type) end)|Pids]). - -worker(Type) -> - receive - {Pid, data, #image{ objects = Os, width = W, background = Bg }} -> - worker(Os, W, Bg, Type, Pid) - end. - -worker(Objects, Width, Bg, Type, Collector) -> - receive - {Pid, scan, {Ys, Ye}} -> - lists:foreach(fun - (Y) -> - Bin = erlang:list_to_binary(scanline(Y, Objects, {0,0,Width - 1, Bg}, Type)), - Collector ! {scan, Y, Bin} - end, lists:seq(Ys,Ye)), - Pid ! {self(), scan_complete}, - worker(Objects, Width, Bg, Type, Collector); - {Pid, scan, Y} -> - Bin = erlang:list_to_binary(scanline(Y, Objects, {0,0,Width - 1, Bg}, Type)), - Collector ! {scan, Y, Bin}, - Pid ! {self(), scan_complete}, - worker(Objects, Width, Bg, Type, Collector); - {_, done} -> - ok - end. - -init_workers(_Image, _Handler, []) -> ok; -init_workers(Image, Handler, [Pid|Pids]) -> - Pid ! {self(), data, Image}, - Handler ! {Pid, scan_complete}, - init_workers(Image, Handler, Pids). - -handle_workers(H, Pids) -> - spawn_link(fun() -> handle_workers(H, H, length(Pids)) end). - -handle_workers(_, 0, _) -> ok; -handle_workers(H, Hi, Np) when H > 0 -> - N = trunc(Hi/(2*Np)), - receive - {Pid, scan_complete} -> - if N < 2 -> - Pid ! {self(), scan, Hi}, - handle_workers(H, Hi - 1, Np); - true -> - Pid ! {self(), scan, {Hi - N, Hi}}, - handle_workers(H, Hi - 1 - N, Np) - end - end. - -finish_workers([]) -> ok; -finish_workers([Pid|Pids]) -> - Pid ! {self(), done}, - finish_workers(Pids). - -receive_binaries(H) -> - receive_binaries(H, []). - -receive_binaries(0, Bins) -> erlang:list_to_binary(Bins); -receive_binaries(H, Bins) when H > 0 -> - receive - {scan, H, Bin} -> - receive_binaries(H - 1, [Bin|Bins]) - end. - -scanline(Y, Os, {_,_,Width,_}=LSB, Type) -> - OLSs = parse_objects_on_line(Y-1, Width, Os), - RLSs = resulting_line_spans([LSB|OLSs],Type), - [ lists:duplicate(Xr - Xl + 1, <<(trunc(R*255)):8,(trunc(G*255)):8,(trunc(B*255)):8>>) || {_,Xl, Xr, {R,G,B,_}} <- RLSs ]. - -resulting_line_spans(LSs,Type) -> - %% Build a list of "transitions" from left to right. - Trans = line_spans_to_trans(LSs), - %% Convert list of "transitions" to linespans. - trans_to_line_spans(Trans,Type). - -line_spans_to_trans(LSs) -> - line_spans_to_trans(LSs,[],0). - -line_spans_to_trans([],Db,_) -> - lists:sort(Db); -line_spans_to_trans([{_,L,R,C}|LSs],Db,Z) -> - line_spans_to_trans(LSs,[{{L,Z,start},C},{{R+1,Z,stop},C}|Db],Z+1). - -trans_to_line_spans(Trans,Type) -> - trans_to_line_spans(simplify_trans(Trans,Type,[],{0.0,0.0,0.0,0.0},[])). - -trans_to_line_spans(SimpleTrans) -> - trans_to_line_spans1(SimpleTrans,[]). - -trans_to_line_spans1([],Spans) -> - Spans; -trans_to_line_spans1([_],Spans) -> - Spans; -trans_to_line_spans1([{L1,_},{L2,C2}|SimpleTrans],Spans) -> - %% We are going backwards now... - trans_to_line_spans1([{L2,C2}|SimpleTrans],[{?DummyC,L2,L1-1,C2}|Spans]). - -simplify_trans([],_,_,_,Acc) -> - Acc; -simplify_trans([{{L,_,_},_}|_] = Trans,Type,Layers,OldC,Acc) -> - {NextTrans,RestTrans} = - lists:splitwith(fun({{L1,_,_},_}) when L1 == L -> - true; - (_) -> - false - end, Trans), - {C,NewLayers} = color(NextTrans,Layers,Type,OldC), - case OldC of - C -> %% No change in color, so transition unnecessary. - simplify_trans(RestTrans,Type,NewLayers,OldC,Acc); - _ -> - simplify_trans(RestTrans,Type,NewLayers,C,[{L,C}|Acc]) - end. - -color(Trans,Layers,Type,OldC) -> - case modify_layers(Layers,Trans) of - Layers -> - {OldC,Layers}; - NewLayers -> - {color(NewLayers,Type),NewLayers} - end. - -color([],_) -> {0.0,0.0,0.0,0.0}; -color([{_,C}|_],opaque) -> C; -color(Layers,alpha) -> color1({0.0,0.0,0.0,0.0},Layers). - -color1(Color,[]) -> Color; -color1(Color,[{_,C}|Layers]) -> color1(alpha_blend(Color,C),Layers). - -modify_layers(Layers,[]) -> Layers; -modify_layers(Layers,[{{_,Z,start},C}|Trans]) -> - modify_layers(add_layer(Layers, Z, C), Trans); -modify_layers(Layers,[{{_,Z,stop },C}|Trans]) -> - modify_layers(remove_layer(Layers, Z, C), Trans). - -add_layer([{Z1,_}=H|Layers],Z,C) when Z1 > Z -> - [H|add_layer(Layers,Z,C)]; -add_layer(Layers,Z,C) -> - [{Z,C}|Layers]. - -remove_layer(Layers,Z,C) -> - Layers -- [{Z,C}]. - -alpha_blend({R1,G1,B1,A1}, {R2,G2,B2,A2}) when is_float(A1), is_float(A2)-> - Beta = A2*(1.0 - A1), - A = A1 + Beta, - R = R1*A1 + R2*Beta, - G = G1*A1 + G2*Beta, - B = B1*A1 + B2*Beta, - {R,G,B,A}. - -parse_objects_on_line(Y, Width, Objects) -> - parse_objects_on_line(Y, 1, Width, Objects, []). -parse_objects_on_line(_Y, _Z, _, [], Out) -> lists:flatten(Out); -parse_objects_on_line(Y, Z, Width, [O|Os], Out) -> - case is_object_on_line(O, Y) of - false -> - parse_objects_on_line(Y, Z + 1, Width, Os, Out); - true -> - OLs = object_line_data(O,Y,Z), - TOLs = trim_object_line_data(OLs, Width), - parse_objects_on_line(Y, Z + 1, Width, Os, [TOLs|Out]) - end. - -trim_object_line_data(OLs, Width) -> - trim_object_line_data(OLs, Width, []). -trim_object_line_data([], _, Out) -> Out; - -trim_object_line_data([{_, Xl, _, _}|OLs], Width, Out) when Xl > Width -> - trim_object_line_data(OLs, Width, Out); -trim_object_line_data([{_, _, Xr, _}|OLs], Width, Out) when Xr < 0 -> - trim_object_line_data(OLs, Width, Out); -trim_object_line_data([{Z, Xl, Xr, C}|OLs], Width, Out) -> - trim_object_line_data(OLs, Width, [{Z, erlang:max(0,Xl), erlang:min(Xr,Width), C}|Out]). - -% object_line_data -% In: -% Object :: image_object() -% Y :: index of height -% Z :: index of depth -% Out: -% OLs = [{Z, Xl, Xr, Color}] -% Z = index of height -% Xl = left X index -% Xr = right X index -% Purpose: -% Calculate the length (start and finish index) of an objects horizontal -% line given the height index. - -object_line_data(#image_object{type=rectangle, - span={X0,Y0,X1,Y1}, color=C}, Y, Z) -> - if - Y0 =:= Y ; Y1 =:= Y -> - [{Z, X0, X1, C}]; - true -> - [{Z, X0, X0, C}, - {Z, X1, X1, C}] - end; - -object_line_data(#image_object{type=filled_rectangle, - span={X0, _, X1, _}, color=C}, _Y, Z) -> - [{Z, X0, X1, C}]; - -object_line_data(#image_object{type=filled_ellipse, - internals={Xr,Yr,Yr2}, span={X0,Y0,X1,Y1}, color=C}, Y, Z) -> - if - X1 - X0 =:= 0; Y1 - Y0 =:= 0 -> - [{Z, X0, X1, C}]; - true -> - Yo = trunc(Y - Y0 - Yr), - Yo2 = Yo*Yo, - Xo = math:sqrt((1 - Yo2/Yr2))*Xr, - [{Z, round(X0 - Xo + Xr), round(X0 + Xo + Xr), C}] - end; - -object_line_data(#image_object{type=filled_triangle, - intervals=Is, color=C}, Y, Z) -> - case lists:keyfind(Y, 1, Is) of - {Y, Xl, Xr} -> [{Z, Xl, Xr, C}]; - false -> [] - end; - -object_line_data(#image_object{type=line, - intervals=M, color={R,G,B,_}}, Y, Z) -> - case M of - #{Y := Ls} -> [{Z, Xl, Xr, {R,G,B,1.0-C/255}}||{Xl,Xr,C} <- Ls]; - _ -> [] - end; - -object_line_data(#image_object{type=polygon, - color=C, intervals=Is}, Y, Z) -> - [{Z, Xl, Xr, C} || {Yp, Xl, Xr} <- Is, Yp =:= Y]; - -object_line_data(#image_object{type=text_horizontal, - color=C, intervals=Is}, Y, Z) -> - [{Z, Xl, Xr, C} || {Yg, Xl, Xr} <- Is, Yg =:= Y]; - -object_line_data(#image_object{type=pixel, - span={X0,_,X1,_}, color=C}, _, Z) -> - [{Z, X0, X1, C}]. - -is_object_on_line(#image_object{span={_,Y0,_,Y1}}, Y) -> - if Y < Y0; Y > Y1 -> false; - true -> true - end. - -%%% primitives to line_spans - -%% compile objects to linespans - -precompile(#image{objects = Os}=I) -> - I#image{objects = precompile_objects(Os)}. - -precompile_objects([]) -> []; -precompile_objects([#image_object{type=line, internals=W, points=[P0,P1]}=O|Os]) -> - [O#image_object{intervals = linespans_to_map(line_to_linespans(P0,P1,W))}|precompile_objects(Os)]; -precompile_objects([#image_object{type=filled_triangle, points=[P0,P1,P2]}=O|Os]) -> - [O#image_object{intervals = triangle_ls(P0,P1,P2)}|precompile_objects(Os)]; -precompile_objects([#image_object{type=polygon, points=Pts}=O|Os]) -> - [O#image_object{intervals = polygon_ls(Pts)}|precompile_objects(Os)]; -precompile_objects([#image_object{type=filled_ellipse, span={X0,Y0,X1,Y1}}=O|Os]) -> - Xr = (X1 - X0)/2, - Yr = (Y1 - Y0)/2, - Yr2 = Yr*Yr, - [O#image_object{internals={Xr,Yr,Yr2}}|precompile_objects(Os)]; -precompile_objects([#image_object{type=arc, points=[P0,P1], internals=D}=O|Os]) -> - Es = egd_primitives:arc_to_edges(P0, P1, D), - Ls = lists:foldl(fun ({Ep0,Ep1},M) -> - linespans_to_map(line_to_linespans(Ep0,Ep1,1),M) - end, #{}, Es), - [O#image_object{type=line, intervals=Ls}|precompile_objects(Os)]; -precompile_objects([#image_object{type=text_horizontal, - points=[P0], internals={Font,Text}}=O|Os]) -> - [O#image_object{intervals=text_horizontal_ls(P0,Font,Text)}|precompile_objects(Os)]; -precompile_objects([O|Os]) -> - [O|precompile_objects(Os)]. - -% triangle - -triangle_ls(P1,P2,P3) -> - % Find top point (or left most top point), - % From that point, two lines will be drawn to the - % other points. - % For each Y step, - % bresenham_line_interval for each of the two lines - % Find the left most and the right most for those lines - % At an end point, a new line to the point already being drawn - % repeat same procedure as above - [Sp1, Sp2, Sp3] = tri_pt_ysort([P1,P2,P3]), - triangle_ls_lp(tri_ls_ysort(line_to_linespans(Sp1,Sp2,1)), Sp2, - tri_ls_ysort(line_to_linespans(Sp1,Sp3,1)), Sp3, []). - -% There will be Y mismatches between the two lists since bresenham is not perfect. -% I can be remedied with checking intervals this could however be costly and -% it may not be necessary, depending on how exact we need the points to be. -% It should at most differ by one and endpoints should be fine. - -triangle_ls_lp([],_,[],_,Out) -> Out; -triangle_ls_lp(LSs1, P1, [], P2, Out) -> - SLSs = tri_ls_ysort(line_to_linespans(P2,P1,1)), - N2 = length(SLSs), - N1 = length(LSs1), - if - N1 > N2 -> - [_|ILSs] = LSs1, - triangle_ls_lp(ILSs, SLSs, Out); - N2 > N1 -> - [_|ILSs] = SLSs, - triangle_ls_lp(LSs1, ILSs, Out); - true -> - triangle_ls_lp(LSs1, SLSs, Out) - end; -triangle_ls_lp([], P1, LSs2, P2, Out) -> - SLSs = tri_ls_ysort(line_to_linespans(P1,P2,1)), - N1 = length(SLSs), - N2 = length(LSs2), - if - N1 > N2 -> - [_|ILSs] = SLSs, - triangle_ls_lp(ILSs, LSs2, Out); - N2 > N1 -> - [_|ILSs] = LSs2, - triangle_ls_lp(SLSs, ILSs, Out); - true -> - triangle_ls_lp(SLSs, LSs2, Out) - end; -triangle_ls_lp([LS1|LSs1],P1,[LS2|LSs2],P2, Out) -> - {Y, Xl1, Xr1,_Ca1} = LS1, - {_, Xl2, Xr2,_Ca2} = LS2, - Xr = lists:max([Xl1,Xr1,Xl2,Xr2]), - Xl = lists:min([Xl1,Xr1,Xl2,Xr2]), - triangle_ls_lp(LSs1,P1,LSs2,P2,[{Y,Xl,Xr}|Out]). - -triangle_ls_lp([],[],Out) -> Out; -triangle_ls_lp([],_,Out) -> Out; -triangle_ls_lp(_,[],Out) -> Out; -triangle_ls_lp([LS1|LSs1], [LS2|LSs2], Out) -> - {Y, Xl1, Xr1, _Ca1} = LS1, - {_, Xl2, Xr2, _Ca2} = LS2, - Xr = lists:max([Xl1,Xr1,Xl2,Xr2]), - Xl = lists:min([Xl1,Xr1,Xl2,Xr2]), - triangle_ls_lp(LSs1,LSs2,[{Y,Xl,Xr}|Out]). - -tri_pt_ysort(Pts) -> - % {X,Y} - lists:sort( - fun ({_,Y1},{_,Y2}) -> - if Y1 > Y2 -> false; true -> true end - end, Pts). - -tri_ls_ysort(LSs) -> - % {Y, Xl, Xr, Ca} - lists:sort( - fun ({Y1,_,_,_},{Y2,_,_,_}) -> - if Y1 > Y2 -> false; true -> true end - end, LSs). - -% polygon_ls -% In: -% Pts :: [{X,Y}] -% Out: -% LSs :: [{Y,Xl,Xr}] -% Purpose: -% Make polygon line spans -% Algorithm: -% 1. Find the left most (lm) point -% 2. Find the two points adjacent to that point -% The tripplet will make a triangle -% 3. Ensure no points lies within the triangle -% 4a.No points within triangle, -% make triangle, -% remove lm point -% 1. -% 4b.point(s) within triangle, -% - - -polygon_ls(Pts) -> - % Make triangles - Tris = polygon_tri(Pts), - % interval triangles - lists:flatten(polygon_tri_ls(Tris, [])). - -polygon_tri_ls([], Out) -> Out; -polygon_tri_ls([{P1,P2,P3}|Tris], Out) -> - polygon_tri_ls(Tris, [triangle_ls(P1,P2,P3)|Out]). - -polygon_tri(Pts) -> - polygon_tri(polygon_lm_pt(Pts), []). - - -polygon_tri([P1,P2,P3],Tris) -> [{P1,P2,P3}|Tris]; -polygon_tri([P2,P1,P3|Pts], Tris) -> - case polygon_tri_test(P1,P2,P3,Pts) of - false -> polygon_tri(polygon_lm_pt([P2,P3|Pts]), [{P1,P2,P3}|Tris]); - [LmPt|Ptsn] -> polygon_tri([P2,P1,LmPt,P3|Ptsn], Tris) - end. - -polygon_tri_test(P1,P2,P3, Pts) -> - polygon_tri_test(P1,P2,P3, Pts, []). - -polygon_tri_test(_,_,_, [], _) -> false; -polygon_tri_test(P1,P2,P3,[Pt|Pts], Ptsr) -> - case point_inside_triangle(Pt, P1,P2,P3) of - false -> polygon_tri_test(P1,P2,P3, Pts, [Pt|Ptsr]); - true -> [Pt|Pts] ++ lists:reverse(Ptsr) - end. - -% polygon_lm_pt -% In: -% Pts :: [{X,Y}] -% Out -% LmPts = [{X0,Y0},{Xmin,Y0},{X1,Y1},...] -% Purpose: -% The order of the list is important -% rotate the elements until Xmin is first -% This is not extremly fast. - -polygon_lm_pt(Pts) -> - Xs = [X||{X,_}<-Pts], - polygon_lm_pt(Pts, lists:min(Xs), []). - -polygon_lm_pt([Pt0,{X,_}=Ptm | Pts], Xmin, Ptsr) when X > Xmin -> - polygon_lm_pt([Ptm|Pts], Xmin, [Pt0|Ptsr]); -polygon_lm_pt(Pts, _, Ptsr) -> - Pts ++ lists:reverse(Ptsr). - - -% return true if P is inside triangle (p1,p2,p3), -% otherwise false. - -points_same_side({P1x,P1y}, {P2x,P2y}, {L1x,L1y}, {L2x,L2y}) -> - ((P1x - L1x)*(L2y - L1y) - (L2x - L1x)*(P1y - L1y) * - (P2x - L1x)*(L2y - L1y) - (L2x - L1x)*(P2y - L1y)) >= 0. - -point_inside_triangle(P, P1, P2, P3) -> - points_same_side(P, P1, P2, P3) and - points_same_side(P, P2, P1, P3) and - points_same_side(P, P3, P1, P2). - -%% [{Y, Xl, Xr}] -> #{Y := [{Xl,Xr}]} -%% Reorganize linspans to a map with Y as key. - -linespans_to_map(Ls) -> - linespans_to_map(Ls,#{}). -linespans_to_map([{Y,Xl,Xr,C}|Ls], M) -> - case M of - #{Y := Spans} -> linespans_to_map(Ls, M#{Y := [{Xl,Xr,C}|Spans]}); - _ -> linespans_to_map(Ls, M#{Y => [{Xl,Xr,C}]}) - end; -linespans_to_map([], M) -> - M. - - -%% line_to_linespans -%% Anti-aliased thick line -%% Do it CPS style -%% In: -%% P1 :: point() -%% P2 :: point() -%% Out: -%% [{Y,Xl,Xr}] -%% -line_to_linespans({X0,Y0},{X1,Y1},Wd) -> - Dx = abs(X1-X0), - Dy = abs(Y1-Y0), - Sx = if X0 < X1 -> 1; true -> -1 end, - Sy = if Y0 < Y1 -> 1; true -> -1 end, - E0 = Dx - Dy, - Ed = if Dx + Dy =:= 0 -> 1; true -> math:sqrt(Dx*Dx + Dy*Dy) end, - line_to_ls(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E0,Ed,(Wd+1)/2,[]). - -line_to_ls(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0) -> - C = max(0, 255*(abs(E - Dx+Dy)/Ed - Wd + 1)), - Ls1 = [{Y0,X0,X0,C}|Ls0], - line_to_ls_sx(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls1,E). - -line_to_ls_sx(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2) when 2*E2 > -Dx -> - line_to_ls_sx_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2+Dy,Y0); -line_to_ls_sx(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2) -> - line_to_ls_sy(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2,X0). - -line_to_ls_sx_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,E2,Y) when E2 < Ed*Wd andalso - (Y1 =/= Y orelse Dx > Dy) -> - Y2 = Y + Sy, - C = max(0,255*(abs(E2)/Ed-Wd+1)), - Ls = [{Y2,X0,X0,C}|Ls0], - line_to_ls_sx_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2+Dx,Y2); -line_to_ls_sx_do(X0,_Y0,X1,_Y1,_Dx,_Dy,_Sx,_Sy,_E,_Ed,_Wd,Ls,_E2,_Y) when X0 =:= X1 -> - Ls; -line_to_ls_sx_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,_E2,_Y) -> - line_to_ls_sy(X0+Sx,Y0,X1,Y1,Dx,Dy,Sx,Sy,E-Dy,Ed,Wd,Ls,E,X0). - -line_to_ls_sy(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,E2,X) when 2*E2 =< Dy -> - line_to_ls_sy_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,Dx-E2,X); -line_to_ls_sy(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,_E2,_X) -> - line_to_ls(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0). - -line_to_ls_sy_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,E2,X) when E2 < Ed*Wd andalso - (X1 =/= X orelse Dx < Dy) -> - X2 = X + Sx, - C = max(0,255*(abs(E2)/Ed-Wd+1)), - Ls = [{Y0,X2,X2,C}|Ls0], - line_to_ls_sy_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls,E2+Dy,X2); -line_to_ls_sy_do(_X0,Y0,_X1,Y1,_Dx,_Dy,_Sx,_Sy,_E,_Ed,_Wd,Ls,_E2,_X) when Y0 =:= Y1 -> - Ls; -line_to_ls_sy_do(X0,Y0,X1,Y1,Dx,Dy,Sx,Sy,E,Ed,Wd,Ls0,_E2,_X) -> - line_to_ls(X0,Y0+Sy,X1,Y1,Dx,Dy,Sx,Sy,E+Dx,Ed,Wd,Ls0). - -% Text - -text_horizontal_ls(Point, Font, Chars) -> - {_Fw,Fh} = egd_font:size(Font), - text_intervals(Point, Fh, Font, Chars, []). - -% This is stupid. The starting point is the top left (Ptl) but the font -% offsets is relative to the bottom right origin, -% {Xtl,Ytl} ------------------------- -% | | -% | Glyph BoundingBox | -% | -------- | -% | |Bitmap| Gh | -% FH |-Gx0-|Data | | -% | -------- | -% | | | -% | Gy0 | -% | | | -% Glyph (0,0)------------------------- Gxm (Glyph X move) -% FW -% Therefore, we need Yo, which is Yo = FH - Gy0 - Gh, -% Font height minus Glyph Y offset minus Glyph bitmap data boundingbox -% height. - -text_intervals( _, _, _, [], Out) -> lists:flatten(Out); -text_intervals({Xtl,Ytl}, Fh, Font, [Code|Chars], Out) -> - {{_Gw, Gh, Gx0, Gy0, Gxm}, LSs} = egd_font:glyph(Font, Code), - % Set offset points from translation matrix to point in TeInVe. - Yo = Fh - Gh + Gy0, - GLSs = text_intervals_vertical({Xtl+Gx0,Ytl+Yo},LSs, []), - text_intervals({Xtl+Gxm,Ytl}, Fh, Font, Chars, [GLSs|Out]). - -text_intervals_vertical( _, [], Out) -> Out; -text_intervals_vertical({Xtl, Ytl}, [LS|LSs], Out) -> - H = lists:foldl( - fun ({Xl,Xr}, RLSs) -> - [{Ytl, Xl + Xtl, Xr + Xtl}|RLSs] - end, [], LS), - text_intervals_vertical({Xtl, Ytl+1}, LSs, [H|Out]). - - -%%% E. PostScript implementation - -eps(#image{ objects = Os, width = W, height = H}) -> - list_to_binary([eps_header(W,H),eps_objects(H,Os),eps_footer()]). - -eps_objects(H,Os) -> eps_objects(H,Os, []). -eps_objects(_,[], Out) -> lists:flatten(Out); -eps_objects(H,[O|Os], Out) -> eps_objects(H,Os, [eps_object(H,O)|Out]). - -eps_object(H,#image_object{ type = text_horizontal, internals = {_Font,Text}, points = [{X,Y}], color={R,G,B,_}}) -> - s("/Times-Roman findfont\n14 scalefont\nsetfont\n~.4f ~.4f ~.4f setrgbcolor\nnewpath\n~p ~p moveto\n(~s) show~n", - [R,G,B,X,H-(Y + 10), Text]); -eps_object(H,#image_object{ type = filled_ellipse, points = [{X1,Y1p},{X2,Y2p}], color={R,G,B,_}}) -> - Y1 = H - Y1p, - Y2 = H - Y2p, - Xr = trunc((X2-X1)/2), - Yr = trunc((Y2-Y1)/2), - Cx = X1 + Xr, - Cy = Y1 + Yr, - s("~.4f ~.4f ~.4f setrgbcolor\nnewpath\n~p ~p ~p ~p 0 360 ellipse fill\n", - [R,G,B,Cx,Cy,Xr,Yr]); -eps_object(H,#image_object{ type = arc, points = [P0, P1], internals = D, color={R,G,B,_}}) -> - Es = egd_primitives:arc_to_edges(P0, P1, D), - [s("~.4f ~.4f ~.4f setrgbcolor\n", [R,G,B])|lists:foldl(fun - ({{X1,Y1},{X2,Y2}}, Eps) -> - [s("newpath\n~p ~p moveto\n~p ~p lineto\n1 setlinewidth\nstroke\n", [X1,H-Y1,X2,H-Y2])|Eps] - end, [], Es)]; - -eps_object(H,#image_object{ type = line, points = [{X1,Y1}, {X2,Y2}], color={R,G,B,_}}) -> - s("~.4f ~.4f ~.4f setrgbcolor\nnewpath\n~p ~p moveto\n~p ~p lineto\n1 setlinewidth\nstroke\n", - [R,G,B,X1,H-Y1,X2,H-Y2]); -eps_object(H,#image_object{ type = rectangle, points = [{X1,Y1}, {X2,Y2}], color={R,G,B,_}}) -> - s("~.4f ~.4f ~.4f setrgbcolor\nnewpath\n~p ~p moveto\n~p ~p lineto\n~p ~p lineto\n~p ~p lineto\n~p ~p lineto\n1 setlinewidth\nstroke\n", - [R,G,B,X1,H-Y1,X2,H-Y1,X2,H-Y2,X1,H-Y2,X1,H-Y1]); -eps_object(H,#image_object{ type = filled_rectangle, points = [{X1,Y1}, {X2,Y2}], color={R,G,B,_}}) -> - s("~.4f ~.4f ~.4f setrgbcolor\nnewpath\n~p ~p moveto\n~p ~p lineto\n~p ~p lineto\n~p ~p lineto\n~p ~p lineto\nclosepath\nfill\n", - [R,G,B,X1,H-Y1,X2,H-Y1,X2,H-Y2,X1,H-Y2,X1,H-Y1]); -eps_object(_,_) -> "". - -s(Format, Terms) -> lists:flatten(io_lib:format(Format, Terms)). - -eps_header(W,H) -> - s("%!PS-Adobe-3.0 EPSF-3.0\n%%Creator: Created by egd\n%%BoundingBox: 0 0 ~p ~p\n%%LanguageLevel: 2\n%%Pages: 1\n%%DocumentData: Clean7Bit\n",[W,H]) ++ - "%%BeginProlog\n/ellipse {7 dict begin\n/endangle exch def\n/startangle exch def\n/yradius exch def\n/xradius exch def\n/yC exch def\n/xC exch def\n" - "/savematrix matrix currentmatrix def\nxC yC translate\nxradius yradius scale\n0 0 1 startangle endangle arc\nsavematrix setmatrix\nend\n} def\n" - "%%EndProlog\n". - -eps_footer() -> - "%%EOF\n". |