Re: Using Graphics.World when drawing

You can set the page units to millimeters. This gives each unit in world
space the value of 1 mm. Conversions to and from pixels are unneccesary.
Such conversion schemes can be a nightmare especially if you have to take
printing into account.

All zooming, panning and mouse input should be handled using a Matrix object
and you should simply paint all your object in their correct place in world
space coordinates.

See the GDI+ FAQ and Windows Forms Tips and Tricks for some ideas.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

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
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<johannblake@xxxxxxxxx> wrote in message
news:1120982496.328054.117110@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I am wondering whether it is easy to setup a coordinate system for
> drawing (using GDI+) that uses meters (or any custom scaling for that
> matter). Currently, I need to convert from pixels to meters for
> scaling. This can sometimes get rather complex when you need to take
> scaling into account or other things like window resizing, scrolling,
> etc.
>
> There is a property called PageUnit which can be set to World. I could
> not find any examples that illustrate how to use this "World" mode. Can
> anyone show me a snippet of code how to setup the client drawing area
> to work with meters?
>
> In old VB, it was possible to create a custom scale. If I said that the
> client area is 100 x 100, my app simply interpreted that as being
> whatever I chose to define as the units. So if I drew a line 10 units
> long horizontally (and assuming that the scale factor was set to one),
> it would draw a line 1/10th the width of my client area. I am looking
> for something along this line of simplicity.
>
> Thanks for any help
> Johann Blake
>


.

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