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

Tips (1548)

Database (90)
Files (137)
Forms (107)
Graphic (116)
IDE (21)
Indy (5)
Internet / LAN (131)
IntraWeb (0)
Math (76)
Misc (127)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (243)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

19 Visitors Online


 
...zoom a Canvas?
Autor: Marc Dürst
Homepage: http://www.idev.ch
[ Print tip ]  

Tip Rating (33):  
     




procedure SetCanvasZoomFactor(Canvas: TCanvas; AZoomFactor: Integer);
var
  
i: Integer;
begin
  if 
AZoomFactor = 100 then
    
SetMapMode(Canvas.Handle, MM_TEXT)
  else
  begin
    
SetMapMode(Canvas.Handle, MM_ISOTROPIC);
    SetWindowExtEx(Canvas.Handle, AZoomFactor, AZoomFactor, nil);
    SetViewportExtEx(Canvas.Handle, 100, 100, nil);
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  
bitmap: TBitmap;
begin
  
bitmap := TBitmap.Create;
  try
    
bitmap.Assign(Form1.image1.Picture.Bitmap);
    SetCanvasZoomFactor(bitmap.Canvas, 70);
    Canvas.Draw(30, 30, bitmap);
  finally
    
bitmap.Free
  end;
end;

 

Rate this tip:

poor
very good


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