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MM_LOMETRIC

Posted on 2002-03-29
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Last Modified: 2008-02-01
Hi all, I have procedure like this

procedure TForm1.Paint;
var
   // ...
begin
 inherited;

  // Some work with canvas

end;

Now I want to set canvas units to mm with

x:=SetMapMode(Canvas.handle, MM_LOMETRIC);

so, when I put this line in TForm1.Paint procedure, application stucked. Where should I do this, and how ?

Cheers,
Zeko
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Comment
Question by:zeko
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8 Comments
 
LVL 3

Expert Comment

by:SteveWaite
ID: 6906380
have a go with these examples..
procedure TForm1.FormPaint(Sender: TObject);
var
  OldVPOrigin, OldOrigin: TPoint
begin
  with PaintBox1.Canvas do
  begin
    SetMapMode(Handle, MM_LOMETRIC);

  //  SetViewPortOrgEx(Handle, 0, 0, @OldVPOrigin);
  //  SetWindowOrgEx(Handle, 0, 0, @OldOrigin);
  //  SetViewPortExtEx(Handle, FinalWidth, FinalHeight, @OldViewPortExtent);
  //  SetWindowExtEx(Handle, BackBuf.Width, BackBuf.Height, @OldWindowExtent);

    SetWindowExtEx(Handle, BackBuf.Width, BackBuf.Height, nil);
    SetViewPortExtEx(Handle, FinalWidth, FinalHeight, nil);

    CopyMode := cmSrcCopy;
    BitBlt(Handle, 0, 0, BackBuf.Width, BackBuf.Height, ABitmap.Canvas.Handle, 0, 0, SRCCOPY);

    //  SetViewPortOrgEx(Handle, OldVPOrigin.X, OldVPOrigin.Y, nil);
    //  SetWindowOrgEx(Handle, OldOrigin.X, OldOrigin.Y, nil);
    //  SetViewPortExtEx(Handle, OldViewPortExtent.X, OldViewPortExtent.Y, nil);
    //  SetWindowExtEx(Handle, OldWindowExtent.X, OldWindowExtent.Y, nil);
    //  Brush.Style := bsSolid;
    //  Font.Color := clYellow;
    //  TextOut(20, 20, 'hello');
  end;
end;

Regards,
Steve
0
 

Author Comment

by:zeko
ID: 6906804
I am working with form canvas not (PaintBox) and my Paint function declaration is like this:

TForm1 = class(TForm)
   procedure FormCreate(Sender: TObject);
   procedure FormDestroy(Sender: TObject);
   procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
   procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
   procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
    procedure Button1Click(Sender: TObject);
 private
   // ...
 public
   procedure Paint; override;

Sorry but I don't think that u answered this question.
0
 
LVL 3

Expert Comment

by:SteveWaite
ID: 6907919
Then just do it this way:


TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);

procedure TForm1.FormPaint(Sender: TObject);
var
  PrevMapMode: Integer;
begin
 with Canvas do // that means Form1.Canvas
 begin
   PrevMapMode := SetMapMode(Handle, MM_LOMETRIC);


Now each logical unit is mapped to 0.1 millimeter. Positive x is to the right; positive y is up.

If the function succeeds, the return value identifies the
previous mapping mode.


Steve
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LVL 3

Expert Comment

by:SteveWaite
ID: 6907929
Same thing if you want to override Paint.
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Accepted Solution

by:
SteveWaite earned 90 total points
ID: 6907961
as in:
procedure TForm1.Paint;
var
  // ...
begin
 inherited;

  with Canvas do // that means Form1.Canvas
  begin
    SetMapMode(Handle, MM_LOMETRIC);

 // Some work with canvas

end;
0
 

Author Comment

by:zeko
ID: 6908671
Well, it's not working in override Paint, I tested it again. I've got window with canvas background same as my desktop background.
0
 

Author Comment

by:zeko
ID: 6908673
Ops, I think that I found mistake, I used DoubleBuffered := true;  in my Form.OnCreate event.

Thanks SteveWaite, here is your earned points. You made a effort to help me.
0
 
LVL 3

Expert Comment

by:SteveWaite
ID: 6908846
Thanks!
0

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