Question

how to calculate rect size

Asked by: joepezt

hi!

I have a case here where I need to calculate a width and height rect of a GraphicControl,  the objects I am using are systools barcode.

sometimes the code sent to this component is to large to fit onto the visible area so  certain parts, width are clipped....

how can I easy expand and shrink the width to match? there is no autosize, in this component, hopefully someone out there have a good answer or how topoint me in the right direction, source are available

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Asked On
2009-03-26 at 09:51:19ID24268085
Tags

systools barcode customcontrol size width height rect

Topics

Pascal Programming Language

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Free Pascal

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Delphi Programming

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Answers

 

by: EddieShipmanPosted on 2009-04-03 at 06:35:40ID: 24059744

Can you show the code you are using to create the barcode?

 

by: EddieShipmanPosted on 2009-04-03 at 06:36:46ID: 24059759

Also, did you see this:

property BarCodeRect : TRect
Indicates the data area of the barcode inside of the component.

While BarCodeHeight and BarCodeWidth provide the size of the data area barcode, the BarCodeRect property provides where the data area of the barcode is actually located in the Bitmap property.

 

by: joepeztPosted on 2009-04-06 at 01:21:10ID: 24075187

I use systools as barcode component

hmm I can check, I will get back to you on this

 

by: EddieShipmanPosted on 2009-04-06 at 06:52:54ID: 24077265

That property IS from the Systools barcode control.

 

by: joepeztPosted on 2009-04-07 at 06:14:53ID: 24086942

strange, I checked the barcode now, and it di not have the barcode rect, unless it is hidden somweher ?

 

by: EddieShipmanPosted on 2009-04-07 at 06:45:54ID: 24087246

It is in their PDF Documentation, for sure, page 686. It is a property of the TStCusom2DBarcode control which all 2D barcodes descend.

 

by: joepeztPosted on 2009-04-07 at 06:49:32ID: 24087289

you may take a look at this source, this is the one I use, and it seem to descend from TGraphicControl or TObject

http://pastebin.com/m39e01f8a

 

by: EddieShipmanPosted on 2009-04-07 at 10:34:53ID: 24089831

Then just use the ClientRect because that is what this uses to draw the barcode. BTW, It is readonly so you cannot set it.

procedure TStBarCode.Paint;
var
  Margin : Integer;
  R      : TRect;
begin
  {use our font}
  Canvas.Font := Font;
 
  {clear the canvas}
  Canvas.Brush.Color := Color;
 
  {  Canvas.Brush.Style := bsSolid; }
  {joepezt added}
  Canvas.Brush.Style := bsClear;
  Canvas.FillRect(ClientRect);
 
  {adjust height of rect to provide top and bottom margin}
  R := ClientRect;  // ******* Retrieved Here 
  Margin := RectHeight(R)*10 div 100;
  InflateRect(R, 0, -Margin);
  PaintPrim(R); // ******* Passed to PaintPrim Here 
end;
 
procedure TStBarCode.PaintPrim(const R : TRect);
begin
  Canvas.Brush.Style := bsClear;
  Canvas.Brush.Color := FBarColor;
  Canvas.Pen.Color := FBarColor;
  DrawBarCode(R);  // ******* Passed to DrawBarCode Here 
end;
                                              
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by: EddieShipmanPosted on 2009-04-07 at 10:37:49ID: 24089863

You might also be able to play around with CalcBarCodeWidth to get the size of the rect for the barcode you will be painting.

 

by: joepeztPosted on 2009-04-07 at 11:10:47ID: 24090177

thanks, will test this when I am at my computer again :)

 

by: joepeztPosted on 2009-05-05 at 23:36:09ID: 31563120

have no time to test this now, but will do this later

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