[mapguide-internals] RFC 14(CartographicStylizationEngine)comments

[Carsten Hess]

Jason,

Agreed with your data model design conclusion - it has to handle all
possible UI's and user needs :)

I also agree with your desire of specifying things to be the same size
everywhere independent of scale. The question is ... how do you specify
something that is always the same size independent of scale?

I am saying you should specify it in real units. Ideally you can take
your ruler to the screen and measure it to be one inch wide if you say
it is one inch wide. If you say it is one pixel wide then this is pretty
meaningless as one pixel is differently sized on all different devices -
a pixel is not a unit. I want to use real units to size symbols, line
width, etc even if we define them in device space. 

Cheers,
  Carsten

-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Jason
Birch
Sent: Thursday, February 15, 2007 2:52 PM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] RFC
14(CartographicStylizationEngine)comments


I agree about not mixing UI and data model, except that you do need to
keep in mind the needs of the users in both phases.  If the data model
does not meet the user's needs then you're setting yourself up for a
huge redesign :)

>From a practical viewpoint, I need to be able specify symbols that
retain their size on the screen, independent of the current view scale.
This is typically done in conjunction with fixed size symbols.  For
instance, at scales from 1-2500, use a fixed size in ground units, and
from there on up, keep the symbol at a fixed size in screen units.

If you take away the ability to specify symbols in screen size, then I
have to set up (hundreds?) of scale-dependant renderings for these
layers.

This applies to:  point symbols, line symbols, and area fill and border
symbols.

Jason
 

-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Carsten
Hess
Sent: Thursday, February 15, 2007 11:23
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] RFC
14(CartographicStylizationEngine)comments

Ha! Now you touch one of the things I think are part of the deadly sins
of software: Mixing UI and data model design ...

So I suggest we focus on specifying maps in real units instead of in
pixel. This will make sure your maps will be legible on all devices
going forward and not just the current configuration you use to set it
up on. 
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