wiki:MapGuideRfc69

Version 4 (modified by zspitzer, 15 years ago) ( diff )

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MapGuide RFC 69 - Rendering Layer Styles using Style Order

This page contains an change request (RFC) for the MapGuide Open Source project. More MapGuide RFCs can be found on the RFCs page.

Status

RFC Template Version(1.0)
Submission DateJun 26 15:40:00 2009
Last ModifiedZac Spitzer Timestamp
AuthorZac Spitzer
RFC Statusproposed
Implementation Status
Proposed Milestone2.2
Assigned PSC guide(s)

Overview

Correct rendering of road networks requires ordering. Major roads should be rendered over the top of minor roads.

Motivation

Currently MapGuide Studio exposes the ability to order individual styles within a layer,
however, the server doesn't support ordered rendering. The only work around currently
is to break road networks into separate layers.


Proposed Solution

Add support to the rendering engine to render layer styles in ordered passes.

After some discussion, it appears that implementing ordering of results from FDO could be an efficient way of approaching this. This avoids requiring MapGuide to issue multiple FDO queries.

The question has been raised about the support for ordering within other providers such as SHP and FDO.

This would require a change to FDO

As this will add overhead, by taking the ordered approach, this could be turned on by an optional field defining column(s) in the layer definition which defines ordering.

Implications

The current approach is to make this an optional enhancement, as to avoid impacting all layers.

Test Plan

None.

Funding/Resources

Help wanted

Related Trac Tickets

#618 Theming stylisation order isn't respected in a layer
FDO Core enhancment: support standard ORDER BY expressions

Discussions

http://n2.nabble.com/MapGuide-RFC-69---Rendering-Layer-Styles-using-Style-Order-td3158848.html
http://n2.nabble.com/RE%3A-MapGuide-RFC-69---Rendering-Layer-Styles-td3159460.html

Attachments (2)

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