?
Solved

TDbCtrlGrid: how to draw a transparent image?

Posted on 2008-10-20
4
Medium Priority
?
1,929 Views
Last Modified: 2013-11-23
Hi,
I've a TDBGrid-component and want to draw images on it depending from an integer-value in the database. It'works well, but I can't make the images transparent. There are simple images, I put the images-background to color clBtnFace and draw i.e a green rectangle. On the CtrlGrid the background of the image is always white. I tried to set the "TransparentColor" but without success. The images are 24Bit. Her's my code:

procedure TForm1.DBCtrlGrid1PaintPanel(DBCtrlGrid: TDBCtrlGrid;
  Index: Integer);
var
  bitmap : TBitmap;
  fixRect : TRect;
  vTyp : integer;
begin
    vTyp :=  DBCtrlGrid.DataSource.DataSet.FieldByName('Typ').AsInteger;
    if vTyp < ImageList1.Count then
    begin
      bitmap := TBitmap.Create;
      try
        ImageList1.GetBitmap(vTyp,bitmap);
        fixRect.Top := 0;
        fixRect.Bottom := fixRect.Top+32;
        fixRect.Left := E_Typ.Left+ E_Typ.Width + 3;
        fixRect.Right := fixRect.Left+32;
        DBCtrlGrid.Canvas.StretchDraw(fixRect,bitmap);
      finally
        FreeAndNil(bitmap);  
      end;
    end;
end;

Thanks for your help, Peter
0
Comment
Question by:formi
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 10

Accepted Solution

by:
atul_parmar earned 1000 total points
ID: 22783546
Hi, add the following line before you draw the image. I've attached the resultant snippet also.

DBCtrlGrid.Canvas.CopyMode := cmMergeCopy;

Atul
procedure TForm1.DBCtrlGrid1PaintPanel(DBCtrlGrid: TDBCtrlGrid;
  Index: Integer);
var
  bitmap : TBitmap;
  fixRect : TRect;
  vTyp : integer;
begin
    vTyp :=  DBCtrlGrid.DataSource.DataSet.FieldByName('Typ').AsInteger;
    if vTyp < ImageList1.Count then
    begin
      bitmap := TBitmap.Create;
      try
        ImageList1.GetBitmap(vTyp,bitmap);
        fixRect.Top := 0;
        fixRect.Bottom := fixRect.Top+32;
        fixRect.Left := E_Typ.Left+ E_Typ.Width + 3;
        fixRect.Right := fixRect.Left+32;
        DBCtrlGrid.Canvas.CopyMode := cmMergeCopy;
        DBCtrlGrid.Canvas.StretchDraw(fixRect,bitmap);
      finally
        FreeAndNil(bitmap);  
      end;
    end;
end;

Open in new window

0
 

Author Comment

by:formi
ID: 22783677
Great, it works. Thank a lot!
0
 

Author Closing Comment

by:formi
ID: 31507785
Yes, it works! Great and thanks a lot! (I'm new in experts-exchange and so I didn't saw the button to accept the solution and to send comments to you, so I added a small comment). Peter
0
 
LVL 16

Expert Comment

by:CodedK
ID: 22784020
Hi formi,

Give it a show with icons.
TICon.Create  etc...

Alternative solution is to use TMS components.
http://www.tmssoftware.com/site/gridpack.asp
They have very good components (but expensive).

Another solution is to try with Bergsoft
http://www.bergsoft.net/
Overview : http://www.bergsoft.net/component/next-dbgrid/overview.htm
you can download a demo to see for yourself...

Hope this helps :)
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
This article is meant to give a basic understanding of how to use R Sweave as a way to merge LaTeX and R code seamlessly into one presentable document.
The goal of this video is to provide viewers with basic examples to understand and use conditional statements in the C programming language.
This video teaches viewers about errors in exception handling.
Suggested Courses

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question