Julia set: Difference between revisions
Ada version
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* [[Mandelbrot_set|Mandelbrot Set]]
<br><br>
=={{header|Ada}}==
{{libheader|SDLAda}}
<lang Ada>with Ada.Numerics.Generic_Complex_Types;
with Ada.Numerics.Generic_Complex_Elementary_Functions;
with SDL.Video.Windows.Makers;
with SDL.Video.Renderers.Makers;
with SDL.Video.Palettes;
with SDL.Events.Events;
procedure Julia_Set is
Width : constant := 1_200;
Height : constant := 900;
type Real is new Float;
package Complex_Real is
new Ada.Numerics.Generic_Complex_Types (Real);
use Complex_Real;
Iter : constant := 100;
C : constant Complex := (Re => -0.70000, Im => 0.27015);
Move : constant Complex := (Re => 0.000, Im => 0.000);
Zoom : constant := 0.800;
Window : SDL.Video.Windows.Window;
Renderer : SDL.Video.Renderers.Renderer;
Event : SDL.Events.Events.Events;
package Complex_Math is
new Ada.Numerics.Generic_Complex_Elementary_Functions (Complex_Real);
use Complex_Math;
function Map (Width, Height : in Integer;
X, Y : in Integer) return Complex
is
C : Complex;
L : constant Real := Real (Integer'Max (Width, Height));
begin
C := (2.0 * Real (X - Width / 2) / (L * Zoom),
2.0 * Real (Y - Height / 2) / (L * Zoom));
return C + Move;
end Map;
procedure Draw_Julia_Set is
use type SDL.C.int;
use SDL.Video.Palettes;
Z : Complex;
begin
for Y in 0 .. Height loop
for X in 0 .. Width loop
Z := Map (Width, Height, X, Y);
for N in 1 .. Iter loop
Z := Z ** 2 + C;
if abs (Z) > 2.0 then
Renderer.Set_Draw_Colour ((Red => 2 * Colour_Component (N),
Green => 255 - 2 * Colour_Component (N),
Blue => 150, Alpha => 255));
Renderer.Draw (Point => (X => SDL.C.int (X),
Y => SDL.C.int (Y)));
exit;
end if;
end loop;
end loop;
end loop;
end Draw_Julia_Set;
procedure Wait is
use type SDL.Events.Event_Types;
begin
loop
while SDL.Events.Events.Poll (Event) loop
if Event.Common.Event_Type = SDL.Events.Quit then
return;
end if;
end loop;
end loop;
end Wait;
begin
if not SDL.Initialise (Flags => SDL.Enable_Screen) then
return;
end if;
SDL.Video.Windows.Makers.Create (Win => Window,
Title => "Julia set",
Position => SDL.Natural_Coordinates'(X => 10, Y => 10),
Size => SDL.Positive_Sizes'(Width, Height),
Flags => 0);
SDL.Video.Renderers.Makers.Create (Renderer, Window.Get_Surface);
Renderer.Set_Draw_Colour ((0, 0, 0, 255));
Renderer.Fill (Rectangle => (0, 0, Width, Height));
Draw_Julia_Set;
Window.Update_Surface;
Wait;
Window.Finalize;
SDL.Finalise;
end Julia_Set;</lang>
=={{header|ALGOL 68}}==
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