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authorBjörn-Egil Dahlberg <[email protected]>2016-05-12 00:19:25 +0200
committerBjörn-Egil Dahlberg <[email protected]>2016-05-12 23:27:03 +0200
commitd03bf100c2e2823f9379d33968fb8e12627224f6 (patch)
treebddbae2d14b3d86b388f3801aa375207dca63ab0 /lib/percept/src
parente390ef9d46a89f1675f5e04297b677590fe566c5 (diff)
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egd: Refactor object_on_line
Diffstat (limited to 'lib/percept/src')
-rw-r--r--lib/percept/src/egd_render.erl51
1 files changed, 28 insertions, 23 deletions
diff --git a/lib/percept/src/egd_render.erl b/lib/percept/src/egd_render.erl
index 8ee41b66ab..faa00ddb55 100644
--- a/lib/percept/src/egd_render.erl
+++ b/lib/percept/src/egd_render.erl
@@ -216,11 +216,11 @@ 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(Y, O) of
+ case is_object_on_line(O, Y) of
false ->
parse_objects_on_line(Y, Z + 1, Width, Os, Out);
true ->
- OLs = object_line_data(Y, Z, O),
+ 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.
@@ -238,9 +238,9 @@ trim_object_line_data([{Z, Xl, Xr, C}|OLs], Width, Out) ->
% object_line_data
% In:
+% Object :: image_object()
% Y :: index of height
% Z :: index of depth
-% Object :: image_object()
% Out:
% OLs = [{Z, Xl, Xr, Color}]
% Z = index of height
@@ -250,21 +250,22 @@ trim_object_line_data([{Z, Xl, Xr, C}|OLs], Width, Out) ->
% Calculate the length (start and finish index) of an objects horizontal
% line given the height index.
-object_line_data(Y, Z, Object) ->
- object_line_data(Y, Z, Object, Object#image_object.type).
-object_line_data(Y, Z, #image_object{ span = {X0, Y0, X1, Y1}, color = C}, rectangle) ->
+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}]
+ Y0 =:= Y ; Y1 =:= Y ->
+ [{Z, X0, X1, C}];
+ true ->
+ [{Z, X0, X0, C},
+ {Z, X1, X1, C}]
end;
-object_line_data(_Y, Z, #image_object{ span = {X0, _, X1, _}, color = C}, filled_rectangle) ->
+object_line_data(#image_object{type=filled_rectangle,
+ span={X0, _, X1, _}, color=C}, _Y, Z) ->
[{Z, X0, X1, C}];
-object_line_data(Y, Z, #image_object{ internals={Xr,Yr,Yr2}, span = {X0,Y0,X1,Y1}, color = C}, filled_ellipse) ->
+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}];
@@ -275,33 +276,37 @@ object_line_data(Y, Z, #image_object{ internals={Xr,Yr,Yr2}, span = {X0,Y0,X1,Y1
[{Z, round(X0 - Xo + Xr), round(X0 + Xo + Xr), C}]
end;
-object_line_data(Y, Z, #image_object{ intervals = Is, color = C}, filled_triangle) ->
+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(Y, Z, #image_object{ intervals = Is, color = C}, line) ->
+object_line_data(#image_object{type=line,
+ intervals=Is, color=C}, Y, Z) ->
case dict:find(Y, Is) of
{ok, Ls} -> [{Z, Xl, Xr, C}||{Xl,Xr} <- Ls];
_ -> []
end;
-object_line_data(Y, Z, #image_object{ color = C, intervals = Is}, polygon) ->
+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(Y, Z, #image_object{ color = C, intervals = Is}, text_horizontal) ->
+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(_, Z, #image_object{ span = {X0,_,X1,_}, color = C}, _) ->
+object_line_data(#image_object{type=pixel,
+ span={X0,_,X1,_}, color=C}, _, Z) ->
[{Z, X0, X1, C}].
-is_object_on_line(Y, #image_object{ span = Span }) ->
- is_object_bounds_on_line(Y, Span).
+is_object_on_line(#image_object{span={_,Y0,_,Y1}}, Y) ->
+ if Y < Y0; Y > Y1 -> false;
+ true -> true
+ end.
-is_object_bounds_on_line(Y, {_,Y0,_,Y1}) when Y < Y0 ; Y > Y1 -> false;
-is_object_bounds_on_line(_, _) -> true.
-
%%% primitives to line_spans
%% compile objects to linespans