[Bargest]

Мой снег (v.1, not too fast) я потом на WinApi переделывал. Но как суть сойдет.

Код:

unit testsneg;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TSnegForm = class(TForm)
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure PaintSneg(x1, y1, x2, y2: integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  TPointExt = record
    x, y, Xstart, Ystart: extended;
    RND: integer;
    Sdvig: extended;
    stop:boolean;
    stopcount:longword;
  end;

var
  SnegForm: TSnegForm;
  S: array [word] of TPointExt;
  SnegCount: word;
  NofTim: longword;
  Veter: extended;

implementation

{$R *.dfm}

procedure TSnegForm.FormCreate(Sender: TObject);
var
  i: word;
begin
 enablewindow(handle,false);
  SetWindowLong(handle, GWL_EXSTYLE,GetWindowLong(Handle, GWL_EXSTYLE)
       or WS_EX_NOACTIVATE or WS_EX_PALETTEWINDOW or WS_EX_TOPMOST);

  SnegCount := 500;
  Veter:=10;
  for i := 0 to SnegCount - 1 do
  begin
    S[i].Xstart := random(screen.Width+100)-50;
    S[i].Ystart := random(screen.height) - screen.height;
    S[i].y := S[i].Ystart;
    S[i].Sdvig := 0;
    S[i].RND := 0;
    s[i].stop:=false;
  end;
end;

procedure TSnegForm.PaintSneg(x1, y1, x2, y2: integer);
begin
  canvas.MoveTo(x1, y1);
  canvas.lineto(x2+1, y2+1);
  canvas.MoveTo(x1, y2);
  canvas.lineto(x2+1, y1-1);
  canvas.MoveTo((x1 + x2) div 2, y1);
  canvas.lineto((x1 + x2) div 2, y2+1);
  canvas.MoveTo(x1, (y1 + y2) div 2);
  canvas.lineto(x2+1, (y1 + y2) div 2);
  //Canvas.Rectangle(x1,y1,x1+2,y1+2);
end;

procedure TSnegForm.Timer1Timer(Sender: TObject);
var
  i,j: word;
  fl: boolean;
  TempX,TempY:integer;
  cv1,cv2:longword;
  Cur:TPoint;

begin
  //BringWindowToTop(handle);
  GetCursorPos(Cur);
  Veter:=20*(cur.X-screen.Width div 2)/screen.Width;
  inc(NofTim);
  fl := true;
  if NofTim >= 100 + random(10) then
  begin
    fl := true;
    NofTim := 0;
  end;
  for i := 0 to SnegCount - 1 do
  begin
    if fl then
    begin
      S[i].RND := random(3) - 1;
    end;
    S[i].Sdvig := S[i].Sdvig + 2 * S[i].RND+Veter;
    Canvas.Pen.Color:=Color;
    TempX:=round(S[i].x);
    TempY:=round(S[i].y);
    PaintSneg(TempX, TempY, TempX+6, TempY+6);
     S[i].y := S[i].y + 5;
    if s[i].y>screen.height then
     s[i].y:=0;
    S[i].x := S[i].Xstart + (10+s[i].rnd) * sin((S[i].y) / 10) + S[i].Sdvig;
    if s[i].x>screen.Width+50 then
     s[i].xStart:=s[i].xStart-screen.Width-100
    else if s[i].x<-50 then
      s[i].xStart:=s[i].xStart+screen.Width+100;
    canvas.Pen.Color := clWhite;
    TempX:=round(S[i].x);
    TempY:=round(S[i].y);
    PaintSneg(TempX, TempY, TempX+6, TempY+6);
  end;
end;

end.