BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Rubber-bands: to XOR or Blt?          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Shawn Oster Guest Posted: Fri May 20, 2005 5:43 pm    Post subject: Rubber-bands: to XOR or Blt? I'm doing the run of the mill rubber-band with handles and I'm curious which method of handling the rubber-banding would be fastest? A. XOR 1. MouseDown: change pen to dotted, draw rect 2. MouseMove: XOR rect, calc new rect, draw rect 3. MouseUp: XOR rect, change pen to solid, draw rect B. BitBlt I haven't actually done this method before so I may have some steps off but it seems like it would go something like this: (Assuming TPaintBox with a BitBlt of Buffer in the OnPaint event) 1. MouseDown: Buffer image, store rect 2. MouseMove: InvalidateRect(rect), calc new rect, draw rect directly to TPaintBox (NOT on Buffer) 3. MouseUp: Draw new rect to Buffer, InvalidateRect It's been a few years since I've done the whole rubber-band/handles code and I'd like something that feels and looks professional (Illustrator/Corel/Visio/etc) Thanks, Shawn Back to top Max Guest Posted: Sat May 21, 2005 1:36 am    Post subject: Re: Rubber-bands: to XOR or Blt? Can you provide a source example of the B method? "Shawn Oster" <soster (AT) colorflex (DOT) com> schrieb im Newsbeitrag news:428e21d5$1 (AT) newsgroups (DOT) borland.com... Quote: I'm doing the run of the mill rubber-band with handles and I'm curious which method of handling the rubber-banding would be fastest? A. XOR 1. MouseDown: change pen to dotted, draw rect 2. MouseMove: XOR rect, calc new rect, draw rect 3. MouseUp: XOR rect, change pen to solid, draw rect B. BitBlt I haven't actually done this method before so I may have some steps off but it seems like it would go something like this: (Assuming TPaintBox with a BitBlt of Buffer in the OnPaint event) 1. MouseDown: Buffer image, store rect 2. MouseMove: InvalidateRect(rect), calc new rect, draw rect directly to TPaintBox (NOT on Buffer) 3. MouseUp: Draw new rect to Buffer, InvalidateRect It's been a few years since I've done the whole rubber-band/handles code and I'd like something that feels and looks professional (Illustrator/Corel/Visio/etc) Thanks, Shawn Back to top Solerman Kaplon Guest Posted: Sat May 21, 2005 11:58 am    Post subject: Re: Rubber-bands: to XOR or Blt? Shawn Oster escreveu: Quote: I'm doing the run of the mill rubber-band with handles and I'm curious which method of handling the rubber-banding would be fastest? [snip] XOR will be faster (and easier), but on today's hardware, very unlikely you will notice difference in speed. The problem is flickering with the second method, drawing the rubber-band and restoring the buffer may become visible to the end user. But if you gonna implement more advanced drawing operations, you will end up needing to implement double buffering anyway so it may not be an issue. And with double buffering you can just draw the whole image directly instead of copying the buffer around, and may be faster than the initial approach considering the different requeriments. I remember that Graphics32 has support for rubber-band and already implement buffered drawing, maybe it feets what you need? Solerman Back to top Shawn Oster Guest Posted: Tue May 24, 2005 10:04 pm    Post subject: Re: Rubber-bands: to XOR or Blt? I can no problem but it's not very attractive. Just a BitBlt in the area I just covered up, let me know if you still want it. "Max" <nospam (AT) nospam (DOT) com> wrote Quote: Can you provide a source example of the B method? Back to top Shawn Oster Guest Posted: Tue May 24, 2005 10:06 pm    Post subject: Re: Rubber-bands: to XOR or Blt? "Solerman Kaplon" <solerman (AT) nospamplease (DOT) wonder.com.br> wrote Quote: Shawn Oster escreveu: I'm doing the run of the mill rubber-band with handles and I'm curious which method of handling the rubber-banding would be fastest? [snip] XOR will be faster (and easier), but on today's hardware, very unlikely you will notice difference in speed. The problem is flickering with the second method, drawing the rubber-band and restoring the buffer may become visible to the end user. But if you gonna implement more advanced drawing operations, you will end up needing to implement double buffering anyway so it may not be an issue. And with double buffering you can just draw the whole image directly instead of copying the buffer around, and may be faster than the initial approach considering the different requeriments. I remember that Graphics32 has support for rubber-band and already implement buffered drawing, maybe it feets what you need? I've been avoiding the G32 library simply because I'm trying to make something very light-weight but I may need to look at that library as I start doing things like rotation and text-wrapping. I went ahead and did the double-buffered approach because I wasn't a fan of the XOR color. Thanks for the reply, it reminded me I already had a buffer I could use for such operations. Shawn Back to top Max Guest Posted: Tue May 24, 2005 10:40 pm    Post subject: Re: Rubber-bands: to XOR or Blt? Quote: just covered up, let me know if you still want it. Yes, sure! I have currently the same problem. I do not know what solution is better at this time ... Back to top Shawn Oster Guest Posted: Thu May 26, 2005 6:18 pm    Post subject: Re: Rubber-bands: to XOR or Blt? Ok, I'll just zip up a basic project and drop it in the attachments group. "Max" <nospam (AT) nospam (DOT) com> wrote Quote: just covered up, let me know if you still want it. Yes, sure! I have currently the same problem. I do not know what solution is better at this time ... Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Graphics All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.