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dotnet drawing api : Using autoscroll
separately, on a panel. In other words, if I select drawing (A) with the mouse, then the autoscroll function would apply only to that object. Is this possible with autoscroll, or is there a better way? I have several objects that I'm drawing to a panel using a retained mode graphics method. Thanks for your help, Steve
Maybe I'm just feeling dense today. Can you explain what you want to do a
bit more consicely please. -- Bob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >I would like to autoscroll objects as I select them (via hit testing), >separately, on a panel. In other words, if I select drawing (A) with the >mouse, then the autoscroll function would apply only to that object. Is >this possible with autoscroll, or is there a better way? I have several >objects that I'm drawing to a panel using a retained mode graphics method. > > Thanks for your help, > > Steve >
If you want to move object A then the process is the same as normal, select
the object and move it according to the mouse values. If you want it to remain visible while being moved regardless of it's position then you could update the window's auto-scroll positions to ensure that the object was in the viewing area. This will be handled by your own particular brand of drawing canvas interpretation. Without knowing what that code is doing I will be unable to make a suggestion. -- Bob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:O7FiHFxVFHA.2196@TK2MSFTNGP09.phx.gbl... >> If I understand what you're wanting to do, you want to be able to >> selectively scroll objects within your panel, taking advantage of the >> AutoScroll capabilities. For example: >> >> You have three objects in the panel - A, B, and C. If you select A and >> scroll the panel, you *only* want A to scroll - B and C should retain >> their positions. > > > Yah, you're right. I didn't explain myself very clearly; thanks for the > 'translation'. I have three objects drawn into a panel. I want to scroll > one of them without affecting the others. Each object has its own Matrix > and Properties that I can change. I'm wondering if it's possible to do > this on a panel using its autoscroll properties, or should I try scrolling > individual objects with a scroll bar from the tool box? > > I hope this makes more sense. > > Thanks for helping this novice! > > Steve > > > > "Scott McChesney" <scott.NO.SPAM.mcchesney@us.army.mil> wrote in message > news:ebgOEBwVFHA.548@tk2msftngp13.phx.gbl... >> Steve - >> >> If I understand what you're wanting to do, you want to be able to >> selectively scroll objects within your panel, taking advantage of the >> AutoScroll capabilities. For example: >> >> You have three objects in the panel - A, B, and C. If you select A and >> scroll the panel, you *only* want A to scroll - B and C should retain >> their positions. >> >> If I have it right, I believe it is possible. From my way of thinking, >> you'll have to store which objects are selected, and then in your Paint >> event, you'll have to "undo" the scroll translation on all unselected >> objects. That way, they should remain in their current position, while >> all others scroll as appropriate. >> >> If you're using a retained-mode system, probably the best thing to do (if >> you aren't already) is to store the transformation to apply within each >> object. That way, you could apply the appropriate translations >> (scrolling or otherwise) to each object - in this case, you would only >> apply the scrolling translation to the selected objects. That would >> provide the best control over object placement. I don't think the Panel >> control provides a Scroll event, but you could apply the scrolling >> translation in your Paint event before you actually draw each object. >> >> I'm not nearly the GDI+ expert that Bob is, so he may have a better >> solution. But this is how I'd tackle the problem. >> >> HTH >> >> - Scott >> >> "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message >> news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >>>I would like to autoscroll objects as I select them (via hit testing), >>>separately, on a panel. In other words, if I select drawing (A) with the >>>mouse, then the autoscroll function would apply only to that object. Is >>>this possible with autoscroll, or is there a better way? I have several >>>objects that I'm drawing to a panel using a retained mode graphics >>>method. >>> >>> Thanks for your help, >>> >>> Steve >>> >> >> > >
Steve -
If I understand what you're wanting to do, you want to be able to selectively scroll objects within your panel, taking advantage of the AutoScroll capabilities. For example: You have three objects in the panel - A, B, and C. If you select A and scroll the panel, you *only* want A to scroll - B and C should retain their positions. If I have it right, I believe it is possible. From my way of thinking, you'll have to store which objects are selected, and then in your Paint event, you'll have to "undo" the scroll translation on all unselected objects. That way, they should remain in their current position, while all others scroll as appropriate. If you're using a retained-mode system, probably the best thing to do (if you aren't already) is to store the transformation to apply within each object. That way, you could apply the appropriate translations (scrolling or otherwise) to each object - in this case, you would only apply the scrolling translation to the selected objects. That would provide the best control over object placement. I don't think the Panel control provides a Scroll event, but you could apply the scrolling translation in your Paint event before you actually draw each object. I'm not nearly the GDI+ expert that Bob is, so he may have a better solution. But this is how I'd tackle the problem. HTH - Scott [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >I would like to autoscroll objects as I select them (via hit testing), >separately, on a panel. In other words, if I select drawing (A) with the >mouse, then the autoscroll function would apply only to that object. Is >this possible with autoscroll, or is there a better way? I have several >objects that I'm drawing to a panel using a retained mode graphics method. > > Thanks for your help, > > Steve >
[quoted text, click to view]
> If I understand what you're wanting to do, you want to be able to > selectively scroll objects within your panel, taking advantage of the > AutoScroll capabilities. For example: > > You have three objects in the panel - A, B, and C. If you select A and > scroll the panel, you *only* want A to scroll - B and C should retain > their positions. Yah, you're right. I didn't explain myself very clearly; thanks for the 'translation'. I have three objects drawn into a panel. I want to scroll one of them without affecting the others. Each object has its own Matrix and Properties that I can change. I'm wondering if it's possible to do this on a panel using its autoscroll properties, or should I try scrolling individual objects with a scroll bar from the tool box? I hope this makes more sense. Thanks for helping this novice! Steve [quoted text, click to view] "Scott McChesney" <scott.NO.SPAM.mcchesney@us.army.mil> wrote in message news:ebgOEBwVFHA.548@tk2msftngp13.phx.gbl... > Steve - > > If I understand what you're wanting to do, you want to be able to > selectively scroll objects within your panel, taking advantage of the > AutoScroll capabilities. For example: > > You have three objects in the panel - A, B, and C. If you select A and > scroll the panel, you *only* want A to scroll - B and C should retain > their positions. > > If I have it right, I believe it is possible. From my way of thinking, > you'll have to store which objects are selected, and then in your Paint > event, you'll have to "undo" the scroll translation on all unselected > objects. That way, they should remain in their current position, while > all others scroll as appropriate. > > If you're using a retained-mode system, probably the best thing to do (if > you aren't already) is to store the transformation to apply within each > object. That way, you could apply the appropriate translations (scrolling > or otherwise) to each object - in this case, you would only apply the > scrolling translation to the selected objects. That would provide the > best control over object placement. I don't think the Panel control > provides a Scroll event, but you could apply the scrolling translation in > your Paint event before you actually draw each object. > > I'm not nearly the GDI+ expert that Bob is, so he may have a better > solution. But this is how I'd tackle the problem. > > HTH > > - Scott > > "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message > news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >>I would like to autoscroll objects as I select them (via hit testing), >>separately, on a panel. In other words, if I select drawing (A) with the >>mouse, then the autoscroll function would apply only to that object. Is >>this possible with autoscroll, or is there a better way? I have several >>objects that I'm drawing to a panel using a retained mode graphics method. >> >> Thanks for your help, >> >> Steve >> > >
You can certainly use the AutoScroll capabilities of the Panel control to do
what you want, and it sounds like you're already set up to handle it. The thing you have to realize is that, as far as drawing graphic objects is concerned, you still have to write code for the AutoScroll to do anything for you, unless you have a panel contained within your scrolling panel that you actually draw on (and size to fit your entire canvas.) Given your retained-mode object model, I wouldn't recommend that method, since enclosing a panel object within another kinda defeats the purpose of your object model, and makes solving this problem REALLY hard. Any .NET controls contained within the panel will be scrolled for you, but anything you draw will have to be managed by the Paint event of your Panel, using the translate methods of each object's Matrix in order to get the right position. In case you haven't yet, check out the "AutoScrollMinSize", "AutoScrollMargin", and "AutoScrollPosition" properties to see how to get everything working. It's not hard to do, but like I said, in order to actually get your graphics to scroll with the scrollbar, you'll have to write some translation code within your Paint event. However, given that each object already has its own Matrix property, it should be relatively simple to add the scrolling translation to each selected object's Matrix before drawing them. Doing that should ensure that your non-selected objects don't go anywhere. If you need a "push" to get you started, Bob Powell's GDI+ FAQ is about the best out there right now. In fact, he's got an article that explains the basics of AutoScroll and graphics operations: http://www.bobpowell.net/understanding_autoscroll.htm He also has an article discussing retained-mode graphics systems, and there is some MSDN information on that available as well. You're also going to want to investigate the Begin/EndContainer methods, if you haven't already. Given that each object has its own Matrix, each object can be transformed/translated independently within the canvas. That almost requires Begin/EndContainer use, so that you can isolate the translations appropriately. Each object needs to start from a consistent translation state, and the easiest one is the identity matrix (no translation), since that's how your Graphics object will be when you enter your Paint event. Using the Begin/EndContainer methods will let you to isolate your transformation to the specific object you're drawing, and reset the Graphics object before you draw your next one. If you don't do it that way, then you will probably never get it to work right. Of course, depending on where your retained-mode graphics system came from, this might all be handled for you, so it's certainly something to investigate before you go writing a bunch of code. If you developed it from scratch, then you'll have to deal with all of this. If you got it from somewhere else, it may already manage some or all of this for you. HTH - Scott [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:O7FiHFxVFHA.2196@TK2MSFTNGP09.phx.gbl... >> If I understand what you're wanting to do, you want to be able to >> selectively scroll objects within your panel, taking advantage of the >> AutoScroll capabilities. For example: >> >> You have three objects in the panel - A, B, and C. If you select A and >> scroll the panel, you *only* want A to scroll - B and C should retain >> their positions. > > > Yah, you're right. I didn't explain myself very clearly; thanks for the > 'translation'. I have three objects drawn into a panel. I want to scroll > one of them without affecting the others. Each object has its own Matrix > and Properties that I can change. I'm wondering if it's possible to do > this on a panel using its autoscroll properties, or should I try scrolling > individual objects with a scroll bar from the tool box? > > I hope this makes more sense. > > Thanks for helping this novice! > > Steve > > > > "Scott McChesney" <scott.NO.SPAM.mcchesney@us.army.mil> wrote in message > news:ebgOEBwVFHA.548@tk2msftngp13.phx.gbl... >> Steve - >> >> If I understand what you're wanting to do, you want to be able to >> selectively scroll objects within your panel, taking advantage of the >> AutoScroll capabilities. For example: >> >> You have three objects in the panel - A, B, and C. If you select A and >> scroll the panel, you *only* want A to scroll - B and C should retain >> their positions. >> >> If I have it right, I believe it is possible. From my way of thinking, >> you'll have to store which objects are selected, and then in your Paint >> event, you'll have to "undo" the scroll translation on all unselected >> objects. That way, they should remain in their current position, while >> all others scroll as appropriate. >> >> If you're using a retained-mode system, probably the best thing to do (if >> you aren't already) is to store the transformation to apply within each >> object. That way, you could apply the appropriate translations >> (scrolling or otherwise) to each object - in this case, you would only >> apply the scrolling translation to the selected objects. That would >> provide the best control over object placement. I don't think the Panel >> control provides a Scroll event, but you could apply the scrolling >> translation in your Paint event before you actually draw each object. >> >> I'm not nearly the GDI+ expert that Bob is, so he may have a better >> solution. But this is how I'd tackle the problem. >> >> HTH >> >> - Scott >> >> "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message >> news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >>>I would like to autoscroll objects as I select them (via hit testing), >>>separately, on a panel. In other words, if I select drawing (A) with the >>>mouse, then the autoscroll function would apply only to that object. Is >>>this possible with autoscroll, or is there a better way? I have several >>>objects that I'm drawing to a panel using a retained mode graphics >>>method. >>> >>> Thanks for your help, >>> >>> Steve >>> >> >> > >
[quoted text, click to view]
"Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message news:e4YDh3xVFHA.228@TK2MSFTNGP12.phx.gbl... > If you want to move object A then the process is the same as normal, > select the object and move it according to the mouse values. If you want > it to remain visible while being moved regardless of it's position then > you could update the window's auto-scroll positions to ensure that the > object was in the viewing area. > What if I don't want object A to move at all when I move the scroll box? How would I set up object A's matrix so that it will *not* move on the panel, while other objects on the panel do, when I move the scroll box? Thanks for your help, Steve
Each object will create it's own matrix from it's scale, rotate, translate
parameters. take a look at the animation example on my site...You would benefit from the following algorithm... Save Graphics using BeginContainer Scale Rotate Translate Draw Restore Graphics using EndContainer -- Bob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:OxMJhH$VFHA.616@TK2MSFTNGP12.phx.gbl... > "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message > news:e4YDh3xVFHA.228@TK2MSFTNGP12.phx.gbl... >> If you want to move object A then the process is the same as normal, >> select the object and move it according to the mouse values. If you want >> it to remain visible while being moved regardless of it's position then >> you could update the window's auto-scroll positions to ensure that the >> object was in the viewing area. >> > > What if I don't want object A to move at all when I move the scroll box? > How would I set up object A's matrix so that it will *not* move on the > panel, while other objects on the panel do, when I move the scroll box? > > Thanks for your help, > > Steve >
Thanks Bob. In your Animation program (very cool BTW) posted on your web
site, is BeginContainer an actual method or is it a name you give for SetupTransform {...}? Steve [quoted text, click to view] "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message news:uCv7VVBWFHA.2700@TK2MSFTNGP12.phx.gbl... > Each object will create it's own matrix from it's scale, rotate, translate > parameters. take a look at the animation example on my site...You would > benefit from the following algorithm... > > Save Graphics using BeginContainer > Scale > Rotate > Translate > Draw > Restore Graphics using EndContainer > > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > > > > "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message > news:OxMJhH$VFHA.616@TK2MSFTNGP12.phx.gbl... >> "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message >> news:e4YDh3xVFHA.228@TK2MSFTNGP12.phx.gbl... >>> If you want to move object A then the process is the same as normal, >>> select the object and move it according to the mouse values. If you want >>> it to remain visible while being moved regardless of it's position then >>> you could update the window's auto-scroll positions to ensure that the >>> object was in the viewing area. >>> >> >> What if I don't want object A to move at all when I move the scroll box? >> How would I set up object A's matrix so that it will *not* move on the >> panel, while other objects on the panel do, when I move the scroll box? >> >> Thanks for your help, >> >> Steve >> > >
Graphics.BeginContainer
-- Bob Powell [MVP] Visual C#, System.Drawing Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:uaCRGxBWFHA.1152@tk2msftngp13.phx.gbl... > Thanks Bob. In your Animation program (very cool BTW) posted on your web > site, is BeginContainer an actual method or is it a name you give for > SetupTransform {...}? > > Steve > > > > "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message > news:uCv7VVBWFHA.2700@TK2MSFTNGP12.phx.gbl... >> Each object will create it's own matrix from it's scale, rotate, >> translate parameters. take a look at the animation example on my >> site...You would benefit from the following algorithm... >> >> Save Graphics using BeginContainer >> Scale >> Rotate >> Translate >> Draw >> Restore Graphics using EndContainer >> >> -- >> Bob Powell [MVP] >> Visual C#, System.Drawing >> >> Find great Windows Forms articles in Windows Forms Tips and Tricks >> http://www.bobpowell.net/tipstricks.htm >> >> Answer those GDI+ questions with the GDI+ FAQ >> http://www.bobpowell.net/faqmain.htm >> >> All new articles provide code in C# and VB.NET. >> Subscribe to the RSS feeds provided and never miss a new article. >> >> >> >> >> >> "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message >> news:OxMJhH$VFHA.616@TK2MSFTNGP12.phx.gbl... >>> "Bob Powell [MVP]" <bob@_spamkiller_bobpowell.net> wrote in message >>> news:e4YDh3xVFHA.228@TK2MSFTNGP12.phx.gbl... >>>> If you want to move object A then the process is the same as normal, >>>> select the object and move it according to the mouse values. If you >>>> want it to remain visible while being moved regardless of it's position >>>> then you could update the window's auto-scroll positions to ensure that >>>> the object was in the viewing area. >>>> >>> >>> What if I don't want object A to move at all when I move the scroll box? >>> How would I set up object A's matrix so that it will *not* move on the >>> panel, while other objects on the panel do, when I move the scroll box? >>> >>> Thanks for your help, >>> >>> Steve >>> >> >> > >
In a nutshell, offset your primitive by the Control.DisplayRectangle
property, manually , or by using a matrix. James -- Create interactive diagrams and flowcharts with ERM Diagram at http://www.crainiate.net Take the ERM Tour at http://www.flowchartcontrol.com [quoted text, click to view] "Steve Magoon" <owkmann@nojunk.yahoo.com> wrote in message news:OCNkxAnVFHA.3864@TK2MSFTNGP10.phx.gbl... >I would like to autoscroll objects as I select them (via hit testing), >separately, on a panel. In other words, if I select drawing (A) with the >mouse, then the autoscroll function would apply only to that object. Is >this possible with autoscroll, or is there a better way? I have several >objects that I'm drawing to a panel using a retained mode graphics method. > > Thanks for your help, > > Steve >
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