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curved line.
I have to build 2 parallel lines of a GPS track (so curved path). Building a sort of lane of the road.
Alex
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That's tricky. You can only draw lines on the left and the right when the road runs north to south. With east to west, you'd need to draw them top and bottom.
I think you're going to be need some trigonometry to do this. You could probably cheat by drawing a thick line and overlaying a thin line and let windows do the rounding of intersections.
Are you in GDI or WPF?
Regards,
Rob Philpott.
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in GDI (I use DrawLine etc...).
Alex
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Ok, using the 'hack' mentioned above, create a new windows forms application in visual studio, and add the following in form1.cs
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
GraphicsPath p = new GraphicsPath(FillMode.Alternate);
p.AddLine(0, 0, 50, 50);
p.AddLine(50, 50, 60, 50);
p.AddLine(60, 50, 60, 60);
p.AddLine(60, 60, 90, 130);
Pen pen = new Pen(Brushes.Black, 10);
Pen p2 = new Pen(Brushes.White, 4);
e.Graphics.DrawPath(pen, p);
e.Graphics.DrawPath(p2, p);
}
That's one approach...
Regards,
Rob Philpott.
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yep. that is what I would try, intuitively I would use odd line widths though.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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Rob Philpott wrote: That's one approach...
Which is nice, apart from the fact that you are not .Dispose() the GraphicsPath and Pen instances you created.
All the best,
Martin
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Thanks.. I try with your solutions ...
Alex
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Hello,
I have another problem. Is there a way to avoid that the circuit is redrawn below? I to draw the current point that moves, use the DrawEllipse function (current position). How can I avoid soiling the circuit with all subsequent drawEllipse?
Thanks.
Alex
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Haven't you posted this at least two times before...? This is not the forum for these kind of posts..
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How many times are you going to do this? You already have annoyed a lot of people. I would say stop it before someone reports you and you get banned.
People have already done that. Now what are you pleading for? If you think this way your article would get published, then let me tell you : No it will not be.
50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!
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Not again.
CCC solved so far: 2 (including a Hard One!)
37!?!! - Randall, Clerks
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Here is the deal: for each "Rank my article please" you publish on a forum, I will find a way to vote your "article" another 1, thus reducing the probability it will ever become public.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. [The QA section does it automatically now, I hope we soon get it on regular forums as well]
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Just report it as a substandard article. That way it will never see the light of day.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Your article has been ranked - several times. You choose to ignore the quite serious criticisms however so I, for one, will not approve your article.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Hey guys,
I'm developing an application (a windows service in fact) which occasionally creates a large amount of objects. It's reasonable the service then consumes a lot of memory (op to 500 Mb). However when the service is done processing all objects (which are being disposed after processing) the service still claims the full 500 Mb. I have spent an entire day finding a memory leak in code but this does not seem to be the problem.
Can anybody explain me (or point to a good reliable document) which explains me when memory is being 'released' after a process claimed it? I don't want to mess with the garbage collector because GC should find out when to clear up stuff.
Thanks!
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Are you doing anything through unmanaged code? I think nAnt provides the graphical view of memory consumption. You might give that a try to find which part of your code is taking up that much of memory.
50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!
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I was also thinking about p/Invoke stuff not being taken care of..
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Nope, it's only managed code. I'm not surprised by the amount of memory consumed, because the amount of instanciated objects is huge, when the objects did their job they are disposed. I'm surprised that the service still uses a lot of memory even when all objects are disposed and the service is idle.
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Well, in that case, check if you are holding reference to any of the huge objects that you would have created. Run a memory profiler and see the results. That should tell you what consumes that much of memory when seervice is idle. Also check if you have use static objects. AFAIK they will exist throughout the lifetime of your service.
50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!
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Oops, I guess I found the problem...
I'm deviding files in chunks of 1024 bytes. The code does something with each chunk and then fires an event which tells the chunk is complete. The event handler then calls a method to start processing the next chunk. This creates a nasty piece of recursive code which consumes a lot of code. Solved this and memory is more stable. I will however run a profiler later to check (and find) additional issues. For now everything seems fine!
Thanks for the help, appreciate that!!
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Hello,
I followed the discussion and have a wild guess now!
Eduard Keilholz wrote: The code does something with each chunk and then fires an event which tells the chunk is complete. The event handler then calls a method to start processing the next chunk.
If you are referencing this chunk, from an object which also holds the event ...
And if you now register (subscribe) this event for every chunk from your "managing" class and not unregister (unsubscribe) after complete ...
Your "managing" class would hold all the references to the objects which hold the references to the chunks and therefor the GC would not be able to free your objects.
Just a wild guess!
Hope you find it.
P.S.: I'm sure with this[^] memory profiler you will find it quickly!
All the best,
Martin
modified on Thursday, January 21, 2010 5:46 AM
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Hey Martin,
Thanks for your reply.. This is what happends
A file becomes 'active'. As soon as a byte becomes active, the 'managing' class registers to three events (Completed, ProcessChanged and ErrorOccured). As soon as ProcessChanged is called, the 'active' file should start handling the next file part. As soon as Completed or ErrorOccured is fired, the 'managing' unregisters for the active file's events and a new file becomes 'active'. This process starts over and over again untill all files are completely processed.
Now the ProcessChanged imidiately called the 'next file part' method which caused a recursive bunch of code. This caused the extreme large amount of memory consumption since some files are fairly large. I changed this so the recursion doesn't take place anymore. My Windows Service now claims about 27 Mb tops, in stead of the previous 500 Mb.
I'll be running the memory profiler soon. Thanks for the interest!
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Hello,
If you really unregister all the events (and I'm sure you do) I think you do not have a memory leak at all.
It's just, like you found out, that you hold a lot of your chunk objects because of the recurse calls.
This forces the GC to move the objects in a next generation.
If your action is done, and no more new objects have to be created, the GC will not see the need of cleaning up the generations.
I would assume, that if you start that action again (in the first implementated version), the 500Mb will not be topped, unless you haven't forgot to unregister the events or holding the objects in an collection for example!
Here[^] is an article, which explains how the GC passes the objects threw the generation levels!
All the best,
Martin
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The windows service now starts claiming about 26 Mb of ram. If I make the service work (really work) it grows to about 28 Mb and then stabilized (dit I write that correct)? It seems that my problem WAS the recursion and not a memory leak. Pretty happy after a day of stress testing, thank for the help!
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