Constructing a clip region from points inside the region

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Crirus - 27 Dec 2003 13:45 GMT

I have all points that are inside a region

But they are a lots of points there... how to convert them to a region as
GraphicsPath that can be shrinked to a graphicsPath points and types..I need
the smallest string that reflect the region

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Cheers,
Crirus

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If work were a good thing, the boss would take it all from you

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James Westgate \(Crainiate\) - 27 Dec 2003 15:27 GMT

Sorry, your question is not very clear ... what do you have now , a region,
graphicspath, or an array of points? What would you like to save and
restore?

James

> I have all points that are inside a region
>
> But they are a lots of points there... how to convert them to a region as
> GraphicsPath that can be shrinked to a graphicsPath points and types..I need
> the smallest string that reflect the region

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Crirus - 28 Dec 2003 07:59 GMT

Wel, I'm looking for various ways to store and send to a graphical client a
region of points

This is what I have:
I have a server with a map (512x512)... (this server have no graphics)
In the server I have an array of points of the map, that are all points
inside some circles... the circles are adiacents (so the points determine a
contiguous portion of the map - not relevant anyway)
Now, I need a way to store all this points in server, and I'm thinking on a
BitArray. (myBitArray(y*512+x) is the point at coords (x,y))
But, in the client I will draw only this areas of the map so I need a way to
send the points to the client...
Anyway, the client dont need to know about each point inside, only the
graphicsPath that can set a draw or clip region.. and I cant send all points
anyway - waste of trafic.

So, how to convert all that points to a GraphicsPath that later I'll convert
to a string of points and types that can be easyly sent to client and
reconstructed

> Sorry, your question is not very clear ... what do you have now , a region,
> graphicspath, or an array of points? What would you like to save and
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> >
> > ------------------------------

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Bob Powell [MVP] - 28 Dec 2003 12:15 GMT

When I started to read your post I thought that you were talking about
converting the data in a Region object back into a GraphicsPath but I don't
think this is the case. I think the way you're asking is how to find only a
specific set of points which coincide with the region on your map. If I'm
wrong, explain a little better and we'll see if we can fix the problem.

I think you could just hit-test the points you have with the GraphicsPath
that represents the region you want to include using the IsVisible method.

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Bob Powell [MVP]
C#, System.Drawing

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> Wel, I'm looking for various ways to store and send to a graphical client a
> region of points
[quoted text clipped - 39 lines]
> > >
> > > ------------------------------

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Crirus - 28 Dec 2003 13:55 GMT

Well, what I have is a set of points that is all insides of some circles...
(notice only circles)
I need all that points to make a hit test on them for other pourposes..
anyway I have them
Now, on UI interface(internet client) I want to draw only the region of the
map that corespond to that points th rest is under "FOG of war"
I dont want to send to client all that points because is not relevant
I want only the points that define the whole region visible

Now, I could have a graphicsPath on server and when I add a circle to the
array of points, just add the circle to the GraphicsPath too, but I'm
searching for a better way...
I'm thinking right now to keep the circles as radius and center in a
collection and make a test on each to drop the ones completly inside the
region so I will have only the ones the dont completly overlapp with the
others

Signature

Cheers,
Crirus

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If work were a good thing, the boss would take it all from you

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> When I started to read your post I thought that you were talking about
> converting the data in a Region object back into a GraphicsPath but I don't
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Crirus - 28 Dec 2003 13:59 GMT

As further question how can I test if a circle is completly covered by
others in a set?

Signature

Cheers,
Crirus

------------------------------
If work were a good thing, the boss would take it all from you

------------------------------

> Well, what I have is a set of points that is all insides of some circles...
> (notice only circles)
[quoted text clipped - 82 lines]
> > > > >
> > > > > ------------------------------

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Crirus - 28 Dec 2003 08:05 GMT

OFF topic to James Westgate
How do you draw does shadows in ERM on shapes? (I sow a screenshot)

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James Westgate \(Crainiate\) - 29 Dec 2003 13:28 GMT

A shadow is just the same graphicspath drawn at an offset to the main shape.
Shadows are drawn first and are alpha blended with the background.

James

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Create interactive flowcharts, diagrams and UML models with ERM3 at
http://www.crainiate.net

> OFF topic to James Westgate
> How do you draw does shadows in ERM on shapes? (I sow a screenshot)
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> > >
> > > ------------------------------

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Constructing a clip region from points inside the region

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