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unit TestHashUnit;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
ExtCtrls,
CastleRandom;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Edit1: TEdit;
Image1: TImage;
Label1: TLabel;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
procedure TForm1.Button1Click(Sender: TObject);
var v: LongWord;
s: string;
begin
v := StringToHash(Edit1.Text);
Label1.Caption := 'Random (0..1) = ' + FloatToStr(v/MaxInt/2);
s := '';
while Length(s)<32 do begin
s := IntToStr(v mod 2)+s;
v := v shr 1
end;
Memo1.Lines.Add(s);
end;
procedure TForm1.Button2Click(Sender: TObject);
var ix,iy: integer;
s: string;
c: byte;
begin
for ix := 0 to Image1.Width do
for iy := 0 to Image1.Height do with Image1.Canvas do begin
s := IntToStr(ix)+'x'+IntToStr(iy); //generate a string different for each pixel and highly inhomogeneous
c := Round(255*(StringToHash(s)/MaxInt/2));
Brush.Color := c+256*c+65536*c;
FillRect(ix,iy,ix+1,iy+1);
end;
end;
end.
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