whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1541)

Database (90)
Files (137)
Forms (107)
Graphic (114)
IDE (21)
Indy (5)
Internet / LAN (130)
IntraWeb (0)
Math (76)
Misc (126)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (266)
VCL (242)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

31 Visitors Online


 
...draw a spray effect?
Autor: Tokter
[ Print tip ]  

Tip Rating (9):  
     


procedure Spray(Canvas: TCanvas; x, y, r: Integer; Color: TColor);
var
  
rad, a: Single;
  i: Integer;
begin
  for 
i := 0 to 100 do
  begin
    
a   := Random * 2 * pi;
    rad := Random * r;
    Canvas.Pixels[x + Round(rad * Cos(a)), y + Round(rad * Sin(a))] := Color;
  end;
end;

procedure TForm1.Image1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  if 
ssLeft in Shift then Spray(Image1.Canvas, x, y, 40, clRed);
end;

procedure TForm1.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if 
ssLeft in Shift then Spray(Image1.Canvas, x, y, 40, clRed);
end;

 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners