[ tušek @ 26.10.2004. 19:55 ] @
u škloi imamo zadatak napraviti njihalo koje bi nakon nekog vremena zbog nekog otpora trebalo prestati sa njihanjem, ja sam napravio njihalo ali ne znam kako ga nakon nekog vremena zaustaviti. molim pomoć!!! unaprijed zahvaljujem ovo sam do sad napravio unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls; type TForm1 = class(TForm) Timer1: TTimer; procedure Timer1Timer(Sender: TObject); procedure FormCreate(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; x0:real=320; y0:real=240; alfa:real=(pi/6); l:real=3; ex:real=60; ey:real=60; deltaalfa:real=-0.1; implementation {$R *.dfm} procedure TForm1.Timer1Timer(Sender: TObject); begin form1.Canvas.Pen.Color:=clbtnface; form1.canvas.moveto(trunc(x0),trunc(y0)); form1.Canvas.lineto(trunc(x0-l*sin(alfa)*ex),trunc(y0+l*cos(alfa)*ey)); form1.canvas.Ellipse(trunc(x0-l*sin(alfa)*ex-5),trunc(y0+l*cos(alfa)*ey-5),trunc(x0-l*sin(alfa)*ey+5),trunc(y0+l*cos(alfa)*ey+5)); alfa:=alfa+deltaalfa; if (alfa<(-pi/3)) or (alfa>(pi/3)) then alfa:=alfa-0.01; deltaalfa:=-deltaalfa; form1.Canvas.Pen.Color:=clblue; form1.canvas.moveto(trunc(x0),trunc(y0)); form1.Canvas.lineto(trunc(x0-l*sin(alfa)*ex),trunc(y0+l*cos(alfa)*ey)); form1.canvas.Ellipse(trunc(x0-l*sin(alfa)*ex-5),trunc(y0+l*cos(alfa)*ey-5),trunc(x0-l*sin(alfa)*ey+5),trunc(y0+l*cos(alfa)*ey+5)); end; procedure TForm1.FormCreate(Sender: TObject); begin end; end. |