|
|
You're in the
dotnet drawing api
group:Learning to place graphics
dotnet drawing api:
Just recently, I tried my hand at some GDI+, starting slowly, and I'm having some trouble now. I tried just a few drawings in a window, and some other stuff, which wasn't too hard, but now I'm wanting to create a program that will allow me to: 1) Select a button from a toolbar. 2) Based on that button, allow me to move the mouse to a section of the screen, or whatever control allows it, 3) Click the mouse and either place a specific object there or START drawing an object from that spot. I've been able to program the button to place an object on the screen so far (a static spot), but I'm having trouble trying to figure out the best way (well, ANY way for that matter) to click that button and THEN move to a specific area before actually "dropping" an object. The thing I'm having the worst problem is how to schedule the event properly. I am sure there are probably several, maybe many even ways to do this, I just cannot get a good handle on it. I posted a similar message to .dotnet.csharp and was told to hunt here. Thanks
You're talking about creating a retained mode graphics system.
Take a look at the GDI+ FAQ article entitled "How do I manipulate Graphics on Screen" http://www.bobpowell.net/manipulate_graphics.htm Well Formed also has an article in the August edition that explains how to create drawing systems and handle the event order correctly. -- Bob Powell [MVP] C#, System.Drawing The November edition of Well Formed is now available. Learn how to create Shell Extensions in managed code. http://www.bobpowell.net/currentissue.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/gdiplus_faq.htm Read my Blog at http://bobpowelldotnet.blogspot.com [quoted text, click to view] "Gary Morris" <gmorris61@carolina.rr.com> wrote in message news:u5F%23LV0zDHA.2456@TK2MSFTNGP12.phx.gbl... > Happy New Year! > > Just recently, I tried my hand at some GDI+, starting > slowly, and I'm having some trouble now. I tried just a > few drawings in a window, and some other stuff, which > wasn't too hard, but now I'm wanting to create a program > that will allow me to: > > 1) Select a button from a toolbar. > 2) Based on that button, allow me to move the mouse to > a section of the screen, or whatever control allows it, > 3) Click the mouse and either place a specific object there > or START drawing an object from that spot. > > I've been able to program the button to place an object on > the screen so far (a static spot), but I'm having trouble > trying to figure out the best way (well, ANY way for that > matter) to click that button and THEN move to a specific > area before actually "dropping" an object. The thing I'm > having the worst problem is how to schedule the event > properly. I am sure there are probably several, maybe > many even ways to do this, I just cannot get a good handle > on it. > > I posted a similar message to .dotnet.csharp and was told > to hunt here. > > Thanks > >
Thanks, that helped a lot! I'm working with it a little at a time
so I can get acquainted with HOW it works and learn how to write my own. I'll probably be back before long with questions if I run into a wall, but so far I'm getting it. One thing that did concern me though is the way that the demo constantly repaints the form. I tried to run it in debug mode, but it was tough to trace because just about anywhere I put a breakpoint caused it to hang there until I cleared the break. It may be that this is the only way to do it, it just seems awfully resource expensive. Then again it IS just a demo, no? [quoted text, click to view] "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message news:OK$an26zDHA.540@tk2msftngp13.phx.gbl... > You're talking about creating a retained mode graphics system. > > Take a look at the GDI+ FAQ article entitled "How do I manipulate Graphics > on Screen" http://www.bobpowell.net/manipulate_graphics.htm > > Well Formed also has an article in the August edition that explains how to > create drawing systems and handle the event order correctly. > > -- > Bob Powell [MVP] > C#, System.Drawing > > The November edition of Well Formed is now available. > Learn how to create Shell Extensions in managed code. > http://www.bobpowell.net/currentissue.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/gdiplus_faq.htm > > Read my Blog at http://bobpowelldotnet.blogspot.com > > "Gary Morris" <gmorris61@carolina.rr.com> wrote in message > news:u5F%23LV0zDHA.2456@TK2MSFTNGP12.phx.gbl... > > Happy New Year! > > > > Just recently, I tried my hand at some GDI+, starting > > slowly, and I'm having some trouble now. I tried just a > > few drawings in a window, and some other stuff, which > > wasn't too hard, but now I'm wanting to create a program > > that will allow me to: > > > > 1) Select a button from a toolbar. > > 2) Based on that button, allow me to move the mouse to > > a section of the screen, or whatever control allows it, > > 3) Click the mouse and either place a specific object there > > or START drawing an object from that spot. > > > > I've been able to program the button to place an object on > > the screen so far (a static spot), but I'm having trouble > > trying to figure out the best way (well, ANY way for that > > matter) to click that button and THEN move to a specific > > area before actually "dropping" an object. The thing I'm > > having the worst problem is how to schedule the event > > properly. I am sure there are probably several, maybe > > many even ways to do this, I just cannot get a good handle > > on it. > > > > I posted a similar message to .dotnet.csharp and was told > > to hunt here. > > > > Thanks > > > > > >
Well, it is a demo yes. A demo of how to manage the event order, handle user
input, create an object model and work within the bounds of the system to handle repainting and so-on. Most graphic applications do exactly the same things, just more variations on the same theme. Event driven systems are sometimes hard to debug because the program has to be able to cope with just about any event at any time so unless you understand why and when an event occurs you'll find it hard to envisage the way that the program runs. Resources aren't an ssue here. You'll find that the code uses resources correctly by correct use of the Dispose method at the correct times. -- Bob Powell [MVP] C#, System.Drawing Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/gdiplus_faq.htm Read my Blog at http://bobpowelldotnet.blogspot.com [quoted text, click to view] "Gary Morris" <gmorris61@carolina.rr.com> wrote in message news:eHUwxHh0DHA.2288@TK2MSFTNGP10.phx.gbl... > Thanks, that helped a lot! I'm working with it a little at a time > so I can get acquainted with HOW it works and learn how to > write my own. I'll probably be back before long with questions > if I run into a wall, but so far I'm getting it. One thing that did > concern me though is the way that the demo constantly > repaints the form. I tried to run it in debug mode, but it was > tough to trace because just about anywhere I put a breakpoint > caused it to hang there until I cleared the break. It may be > that this is the only way to do it, it just seems awfully > resource expensive. Then again it IS just a demo, no? > > "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message > news:OK$an26zDHA.540@tk2msftngp13.phx.gbl... > > You're talking about creating a retained mode graphics system. > > > > Take a look at the GDI+ FAQ article entitled "How do I manipulate Graphics > > on Screen" http://www.bobpowell.net/manipulate_graphics.htm > > > > Well Formed also has an article in the August edition that explains how to > > create drawing systems and handle the event order correctly. > > > > -- > > Bob Powell [MVP] > > C#, System.Drawing > > > > The November edition of Well Formed is now available. > > Learn how to create Shell Extensions in managed code. > > http://www.bobpowell.net/currentissue.htm > > > > Answer those GDI+ questions with the GDI+ FAQ > > http://www.bobpowell.net/gdiplus_faq.htm > > > > Read my Blog at http://bobpowelldotnet.blogspot.com > > > > "Gary Morris" <gmorris61@carolina.rr.com> wrote in message > > news:u5F%23LV0zDHA.2456@TK2MSFTNGP12.phx.gbl... > > > Happy New Year! > > > > > > Just recently, I tried my hand at some GDI+, starting > > > slowly, and I'm having some trouble now. I tried just a > > > few drawings in a window, and some other stuff, which > > > wasn't too hard, but now I'm wanting to create a program > > > that will allow me to: > > > > > > 1) Select a button from a toolbar. > > > 2) Based on that button, allow me to move the mouse to > > > a section of the screen, or whatever control allows it, > > > 3) Click the mouse and either place a specific object there > > > or START drawing an object from that spot. > > > > > > I've been able to program the button to place an object on > > > the screen so far (a static spot), but I'm having trouble > > > trying to figure out the best way (well, ANY way for that > > > matter) to click that button and THEN move to a specific > > > area before actually "dropping" an object. The thing I'm > > > having the worst problem is how to schedule the event > > > properly. I am sure there are probably several, maybe > > > many even ways to do this, I just cannot get a good handle > > > on it. > > > > > > I posted a similar message to .dotnet.csharp and was told > > > to hunt here. > > > > > > Thanks > > > > > > > > > > > >
Don't see what you're looking for? Try a search.
|
June 2003
July 2003
August 2003
September 2003
October 2003
November 2003
December 2003
January 2004
February 2004
March 2004
April 2004
May 2004
June 2004
July 2004
August 2004
September 2004
October 2004
November 2004
December 2004
January 2005
February 2005
March 2005
April 2005
May 2005
June 2005
July 2005
August 2005
September 2005
October 2005
November 2005
December 2005
January 2006
February 2006
March 2006
April 2006
May 2006
June 2006
July 2006
August 2006
September 2006
October 2006
November 2006
December 2006
January 2007
February 2007
March 2007
April 2007
May 2007
June 2007
July 2007
August 2007
September 2007
October 2007
November 2007
December 2007
January 2008
February 2008
March 2008
April 2008
May 2008
June 2008
| home · blog · groups | Questions? Comments? Contact the dn |