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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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45
Task/Sierpinski-pentagon/Ada/sierpinski-pentagon.ada
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pragma Ada_2022;
with Ada.Numerics; use Ada.Numerics;
with Ada.Numerics.Discrete_Random;
with Ada.Numerics.Elementary_Functions; use Ada.Numerics.Elementary_Functions;
with Easy_Graphics; use Easy_Graphics;
procedure Sierpinski_Pentagon is
Img : Easy_Image := New_Image ((1, 1), (512, 512), WHITE);
procedure Chaos_Game (Image : in out Easy_Image;
Vertex_Count : Positive;
Radius : Float;
Iters : Positive) is
type Vertex_Array is array (1 .. Vertex_Count) of Point;
Vertices : Vertex_Array;
subtype Vertex_Range is Integer range 1 .. Vertex_Count;
package Rand_V is new Ada.Numerics.Discrete_Random (Vertex_Range);
use Rand_V;
Gen : Generator;
Half_X : constant Integer := X_Last (Image) / 2;
Half_Y : constant Integer := Y_Last (Image) / 2;
Half_Pi : constant Float := Float (Pi) / 2.0;
Two_Pi : constant Float := Float (Pi) * 2.0;
V : Integer;
X : Integer := Half_X;
Y : Integer := Half_Y;
begin
for V in 1 .. Vertex_Count loop
Vertices (V).X := Half_X + Integer (Float (Half_X) *
Cos (Half_Pi + (Float (V - 1)) * Two_Pi / Float (Vertex_Count)));
Vertices (V).Y := Half_Y - Integer (Float (Half_Y) *
Sin (Half_Pi + (Float (V - 1)) * Two_Pi / Float (Vertex_Count)));
end loop;
for I in 1 .. Iters loop
V := Random (Gen);
X := X + Integer (Radius * Float (Vertices (V).X - X));
Y := Y + Integer (Radius * Float (Vertices (V).Y - Y));
Plot (Image, (X, Y), BLACK);
end loop;
end Chaos_Game;
begin
Chaos_Game (Img, 5, 1.0 / ((1.0 + Sqrt (5.0)) / 2.0), 1_000_000);
Write_GIF (Img, "sierpinski_pentagon.gif");
end Sierpinski_Pentagon;