Polygon Drawing Discussion

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sabelt
Polygon Mapper
Posts: 155
Joined: Mon Sep 15, 2008 12:47 pm
Location: Damansara, Oregon 300

Re: MFM polygon project

Postby sabelt » Wed Oct 08, 2008 5:11 pm

any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....

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tympg
Senior Mapper
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Joined: Mon Sep 15, 2008 11:01 am
Location: Penang

Re: MFM polygon project

Postby tympg » Wed Oct 08, 2008 5:25 pm

sabelt wrote:any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....


To have a polygon node stick better to another polygons' node, make sure

  • Stick to Neighbours is enabled
  • there are at least 2 levels:
    • Level 0=24 bits, zoom=0
    • Level 1=22, 21 or 20 bits, zoom=0 or 1
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sabelt
Polygon Mapper
Posts: 155
Joined: Mon Sep 15, 2008 12:47 pm
Location: Damansara, Oregon 300

Re: MFM polygon project

Postby sabelt » Wed Oct 08, 2008 5:35 pm

Sorry but i dont see any stick to neighbours function in mapedit. Where is it?

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tympg
Senior Mapper
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Location: Penang

Re: MFM polygon project

Postby tympg » Wed Oct 08, 2008 5:38 pm

sabelt wrote:any tips hot to join merge lakes and city park/forest in a proper way?

It would be great if we have a poly section in this forum due to increasing number of mapedit users here....

You can also use the Subtract Polygon method, example below:

First draw a Lake polygon:
20081008_tympg polygon wrapping 01.PNG


Then draw a City Park polygon
20081008_tympg polygon wrapping 02.PNG


Hold down the Ctrl Key to also select the Lake polygon
20081008_tympg polygon wrapping 03.PNG
Last edited by tympg on Wed Oct 08, 2008 10:49 pm, edited 1 time in total.
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sabelt
Polygon Mapper
Posts: 155
Joined: Mon Sep 15, 2008 12:47 pm
Location: Damansara, Oregon 300

Re: MFM polygon project

Postby sabelt » Wed Oct 08, 2008 5:39 pm

Cool thanks! :peace:

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tympg
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Location: Penang

Re: MFM polygon project

Postby tympg » Wed Oct 08, 2008 5:42 pm

(Continued from above...)

Right-click and choose Subtract Polygons
20081008_tympg polygon wrapping 04.PNG


Et voilà! The City Park polygon wraps around the Lake polygon neatly
20081008_tympg polygon wrapping 05.PNG
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tympg
Senior Mapper
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Joined: Mon Sep 15, 2008 11:01 am
Location: Penang

Re: MFM polygon project

Postby tympg » Wed Oct 08, 2008 5:44 pm

sabelt wrote:Sorry but i dont see any stick to neighbours function in mapedit. Where is it?

Tools > Options... > Edit
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76gpsguy
Polygon Mapper
Posts: 207
Joined: Tue Sep 16, 2008 10:15 pm
Location: Puchong, SEL (Symbian MXT)

Re: MFM polygon project

Postby 76gpsguy » Wed Oct 08, 2008 6:03 pm

tympg wrote:You also use the Subtract Polygon method, example below:
Will the common edges of the 2 polygons be separated after compile to img file? Can we consider setting the polygon draw priority in such the way that the lake polygon is on top of City Park?

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sabre23t
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Location: Klang, Selangor (Nuvi2575R)
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Re: MFM polygon project

Postby sabre23t » Wed Oct 08, 2008 6:18 pm

76gpsguy wrote:Will the common edges of the 2 polygons be separated after compile to img file? Can we consider setting the polygon draw priority in such the way that the lake polygon is on top of City Park?

When you use the subtract method the two polygons are no longer overlapping at all. They share a common edge/border. One could be even completely within another. Both polygons will show regardless of polygon draw priority.

If we want lake polygon to draw on city park, we have to be sure that in all (or almost all cases) we want lake polygon to be on top of city park. In this case, I think that might well be true. For the exception, we can use the subtract method when in the rare case of wanting an island city park to be on top of a lake polygon.

:-k
4SQ, Waze, GMM, MSM, MFM & OSM ;-}

edchuang (retired)
Regional Mapper (retired)
Posts: 752
Joined: Sat Sep 27, 2008 2:37 am
Location: Shah Alam (GMXT+i-Blue747 Logger, Holux GPSmile62 Pro)

Re: Polygon Drawing Discussion

Postby edchuang (retired) » Tue Oct 14, 2008 9:54 pm

Really wanted to start polygon drawing after reading all the forums and posts in Mapping Guideline & Standards Discussion. Anyone have extra license for mapedit want to sell? If yes, please let me know so that I can start to learn polygon drawing immediately.

:tq:


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