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Drawing a triangle

Posted on 2002-05-03
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Last Modified: 2008-02-01
Is there an easy way to draw a triangle on screen without having to use canvas funtions and stuff?

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Question by:Gareth_Hastings
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by:kretzschmar
ID: 6989082
? without using direct tcanvas-methods

well you could print a triangle on a printer using a symbol-font-char ($D1), then scan the print and save as bitmap
then code your app ,use there a timage and load this bitmap into it :-))

just kiding

i used this for drawing a sorting triangle on a gridcolumntitle (a static triangle)

procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
const CMargin = 5;
begin
  If (ARow = 0) and (ACol = FSortedColIndex) then  //FSortedColIndex->the col, which is sorted
  case FSortOrder of
    true : begin  //Ascending
             StringGrid1.Canvas.Pen.Color := clbtnShadow;
             StringGrid1.Canvas.MoveTo(Rect.Right-CMargin,Rect.Top+CMargin);
             StringGrid1.Canvas.LineTo(Rect.Right-7-CMargin,Rect.Top+CMargin);
             StringGrid1.Canvas.LineTo(Rect.Right-4-CMargin,Rect.Top+7+CMargin);
             StringGrid1.Canvas.Pen.Color := clBtnHighLight;
             StringGrid1.Canvas.LineTo(Rect.Right-CMargin,Rect.Top+CMargin);
           end;
   false : begin  //Descending
             StringGrid1.Canvas.Pen.Color := clBtnHighLight;
             StringGrid1.Canvas.MoveTo(Rect.Right-4-CMargin,Rect.Top+CMargin);
             StringGrid1.Canvas.LineTo(Rect.Right-CMargin,Rect.Top+7+CMargin);
             StringGrid1.Canvas.LineTo(Rect.Right-7-CMargin,Rect.Top+7+CMargin);
             StringGrid1.Canvas.Pen.Color := clbtnShadow;
             StringGrid1.Canvas.LineTo(Rect.Right-4-CMargin,Rect.Top+CMargin);
           end;
  end;
end;

well tell a bit more about your triangle

meikl ;-)
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by:Gareth_Hastings
ID: 6989111
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by:pnh73
ID: 9004619
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