Solved

Using ExtCreateRegion

Posted on 1998-11-23
2
1,176 Views
Last Modified: 2010-10-05
Hi.
I'm looking for simple example using ExtCreateRegion.
I don't know how to parse the rectangles to this functions.
3 rectangles will be enough to demonstrate this problem.
Thanx!
0
Comment
Question by:Aleq
[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
2 Comments
 
LVL 5

Expert Comment

by:ronit051397
ID: 1347701
0
 
LVL 5

Accepted Solution

by:
ronit051397 earned 50 total points
ID: 1347702
Hi Aleq, I post this article from Borland's groups as an answer:
"...Here is some sample code (it is not optimized):

                        FRegion:=CreateRectRgn(0,0, 0,0);
                        try
                          for i:=0 to FBitmap.Height-1 do
                            begin
                              for j:=R.Left to R.Right-1 do
                                begin
                                  C:=FBitmap.Canvas.Pixels[j,i];
                                  if C<>TransColor then
                                    begin
                                      Rgn1:=CreateRectRgn(j-R.Left,i,succ(j-R.Left),succ(i));
                                      Rgn2:=CopyRgn(FRegion);
                                      CombineRgn(FRegion,Rgn2,Rgn1,RGN_OR);
                                      DeleteObject(Rgn1);
                                      DeleteObject(Rgn2)
                                    end
                                end
                            end
                        except
                          DeleteObject(FRegion);
                          FRegion:=0
                        end

                  Here is CopyRgn function:

                  function CopyRgn(Rgn:hRgn):hRgn;
                  var RData:PRgnData;
                         sz:integer;
                  begin
                    Result:=0;
                    if Rgn=0 then exit;
                    sz:=GetRegionData(Rgn,0,nil);
                    if sz=0 then exit;
                    GetMem(RData,sz);
                    try
                      GetRegionData(Rgn,sz,RData);
                      Result:=ExtCreateRegion(nil,sz,RData^);
                    finally
                      FreeMem(RData)
                    end;
                  end;
."
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…

695 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