Sierpinski square curve: Difference between revisions
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{{out}}
Output is similar to C++.
=={{header|Ada}}==
Creates an SVG file.
<syntaxhighlight lang="ada">
with Ada.Numerics; use Ada.Numerics;
with Ada.Numerics.Elementary_Functions; use Ada.Numerics.Elementary_Functions;
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
procedure Sierpinski_Square_Curve is
Axiom : constant String := "F+XF+F+XF";
Rules : constant String := "XF-F+F-XF+F+XF-F+F-X";
ORDER : constant Positive := 5;
LENGTH : constant Positive := 4;
X : Integer := (600 - LENGTH) / 2;
Y : Integer := LENGTH;
Angle : Integer := 0;
SVG_File : File_Type;
Production : Unbounded_String := To_Unbounded_String (Axiom);
function Rewrite (Str : String) return Unbounded_String is
Prod : Unbounded_String;
begin
for C of Str loop
if C = 'X' then
Prod := Prod & Rules;
else
Prod := Prod & C;
end if;
end loop;
return Prod;
end Rewrite;
begin
Create (SVG_File, Out_File, "sierpinski.svg");
Put_Line (SVG_File, "<svg xmlns='http://www.w3.org/2000/svg' width='600' height='600'>");
Put_Line (SVG_File, "<rect width='100%' height='100%' fill='white'/>");
Put (SVG_File, "<path stroke-width='1' stroke='black' fill='none' d='M" &
X'Image & "," & Y'Image & " ");
for I in 1 .. ORDER loop
Production := Rewrite (To_String (Production));
end loop;
for C of To_String (Production) loop
case C is
when 'F' =>
X := X + LENGTH * Integer (Cos (Float (Angle), 360.0));
Y := Y + LENGTH * Integer (Sin (Float (Angle), 360.0));
Put (SVG_File, " L" & X'Image & "," & Y'Image);
when '+' => Angle := (Angle + 90) mod 360;
when '-' => Angle := (Angle - 90) mod 360;
when others => null;
end case;
end loop;
Put_Line (SVG_File, "'/>\n</svg>");
Close (SVG_File);
end Sierpinski_Square_Curve;
</syntaxhighlight>
=={{header|ALGOL 68}}==
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