MapBasic MapInfo refresh

[Anna Dougherty]

Hi List users,
I have a problem with refreshing the map when using MapBasic code. I
have code that will set the translucency of a GRD or GRC layer to 50%.
Sometimes when I run it, it will work. Sometimes it will not work. If
I manually go into the layer control properties, and set the
translucency, it will work every time the code is run after that. Does
anyone know of a command that will force the map to redraw correctly.
I have tried "Set Map Redraw On" and "Update Window FrontWindow()" but
neither of them work consistently. Any ideas?

Many thanks,
Anna

[SMITH,Stephen (ACT)]

I would try Set Redraw OFF, add some layers or make all the change and then Set Redraw ON after all the changes have been made. If that does not work you might try turning on the enhanced rendering settings. Let me know how it goes.

Set Window WinID Enhanced ON Smooth Text Antialias Smooth Image High Smooth Vector Antialias

Regards
Steve Smith
Geospatial Intelligence & Support
Research Branch
Social Policy & Economic Strategy Group
Dept of Education Employment and Workplace Relations
email:- Stephen...@DEEWR.gov.au
Wk:- (02) 6240-9048
Location:- Level 5, near C11
50 Marcus Clarke St, Canberra City Act 2601
GPO Box 9880 Canberra Act 2601

Many thanks,
Anna

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[Peter Horsbøll Møller]

You could alos try to set the map in a state of no update using this statement:

Set Map Redraw Suspended

and then afterwards to on the map redraw:

Set Map Redraw On

Peter Horsbøll Møller
Pitney Bowes Business Insight - MapInfo

2011/12/7 SMITH,Stephen (ACT) <Stephen...@deewr.gov.au>

[Anna Dougherty]

Thanks Stephen and Peter for your help. I tried your suggestions, and they both work for refreshing the map, but only if I first go into the layer control and manually change the translucency for every layer. If I do not do that, then

the map stubbornly refuses to refresh. It's a mystery to me!

Here is my code...

 

    Set Event Processing Off    
    'Set Map Redraw Off

    Set Map Layer SelectedlayerNumber Translucency 100

    Set Event Processing On
    'Set Map Redraw On

 

I tried both "Set Event Processing Off" and "Set Map Redraw Off", but neither of them worked consistently, unless I first set the values manually, in which case they both work perfectly. There may be up to 17 GRC or GRD layers that I want to make translucent. I am using an array to loop through the layer numbers (SelectedlayerNumber). What do you think?

 

Thanks again for your help.

 

Best wishes,

Anna

[Scott.S...@bell.ca]

Hello,

 

What is the command to access the old layer control in MapInfo version 11.0.  I  find the old layer control much faster for Map creation.

 

Thanks

 

Scott

[Sally4]

Menu Command 801

On Dec 7, 11:14 pm, "Scott.Snash...@bell.ca" <Scott.Snash...@bell.ca>
wrote:

[Anna Dougherty]

I have one more question about my MapBasic program. I am switching on and off selected layer names to do the screenshots. Thing is, the screenshot layer names are only 30 characters long (as they are in the layer control in MapInfo). Would it be possible to grab the complete layer name (as seen in the tooltips when hovering over the layer control in MapInfo)? Most of my layer names are over 30 characters long, and it's hard for the users to determine which one they need to choose.

 

Best wishes,

Anna

[Thomas Bacon]

Hi Anna,

 

Have you tried the LayerInfo() function with LAYER_INFO_NAME as the attribute? I’m not sure whether this will return the full name, but it’s worth a try if you haven’t already.

 

Regards,

 

Tom Bacon

Graduate GIS Engineer

Asset Management South

Tel: 01444 472380

www.mouchel.com

 

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[Peter Horsbøll Møller]

Anna,

You can get to the filename of the layer thru PathToFileName$(LayerInfo(nLayer, LAYER_INFO_PATH))

LayerInfo(nLayer, LAYER_INFO_PATH) will give you the path to the tab file "behind" the layer

PathToFileName$() will extract the file name from a path (remember there is a difference between the table name and the file name)

If you don't want the .TAB neding you can remove that as well:

Left$(PathToFileName$(LayerInfo(nLayer, LAYER_INFO_PATH)), Len(PathToFileName$(LayerInfo(nLayer, LAYER_INFO_PATH))) - 4)

But this would require that you write some kind of interface (a window/dialog) of your own and lets the users use this.

Peter Horsbøll Møller
Pitney Bowes Business Insight - MapInfo

2011/12/15 Anna Dougherty <annamariely...@gmail.com>

[Anna Dougherty]

Thank you Thomas and Peter! I was already using Layer_Info_Name to get the layer names, but that is limited to 30 characters. I looked into Layer_Info_Path, but hadn't quite figured out how to parse the result, and now Peter has told me! Thank you both so much for your help!

 

Best wishes,

Anna

[Anna Dougherty]

Hi all, I just upgraded to MapInfo v10.5, and the same thing is happening again with my code. I can run the code and set the Alpha or Translucency variables on the layer to make the layer invisible (Alpha = 0 or Translucency = 100). If I then look at the layer properties in the layer control, the Translucency is set to 100%. But, the layer is still visible onscreen. I have tried various combinations of "Set Event Processing Off/On", "Set Map Redraw Off/On", "Set Window Front Window() Enhanced On", "Set Map Redraw Suspended/On", but the layer is still visible on screen. Is there anything I can do to make this layer invisible (it is a raster layer)?

 

Thanks for your help.

Best wishes,

Anna

[Peter Horsbøll Møller]

Anna,

Have you installed the updates fro 10.5? I think we did some issues with translucency in one of those.

Peter Horsbøll Møller
Pitney Bowes Software

2012/2/17 Anna Dougherty <annamariely...@gmail.com>

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[Anna Dougherty]

Hi Peter, I just tried some MapBasic code in MapInfo v11.0.3 (the latest release available from the PB website). The code (as as test), simply sets three raster layers to be 100% translucent. When the code finishes, if I look at the layer properties, the translucency is set to 100% for all three layers. All three layers are still visible on screen though. I think that the problem is to do with the screen refresh rather than the Set..Map layer command. What do you think? What issues did you have with translucency in MapInfo v10.5?

 

Thanks for all your help.

 

Anna

[Peter Horsbøll Møller]

Anna,

Could you share your very basic sample code?

I recall there was an issue where setting one layer tranlucent, affected other layers - or something similar.

Peter Horsbøll Møller
Pitney Bowes Software

2012/2/20 Anna Dougherty <annamariely...@gmail.com>

[Anna Dougherty]

Hi Peter, no problem, here is my sample code.

 

First I get a list of layers that the user wants to make transparent.

Then I loop through the list of layers and set each layer (SelectedLayerNumber) to be transparent.

 

For each layer I do the following:

 

  Set Event Processing Off  

  Set Map Layer SelectedlayerNumber Translucency 100 
  Set Event Processing On

  Update Window FrontWindow()

 

This does not work, the layer is set to 100% translucent in the layer properties, but the layer remains on the map.

 

Thank you so much for your help!

 

Anna

[Peter Horsbøll Møller]

Hi Anna,

I had a glance at this and the problem is that when you set the translucency on a raster layer, you actually set the "global style" of the layer.

So in order to also see the change in the map, you also need to set the layer to use the global style and not the "graphic style" from the table itself

This statement should do the trick:

Set Map Layer SelectedlayerNumber Display Global Translucency 100 

[Anna Dougherty]

Hi Peter, thank you so much for your help! It worked perfectly! I would never have figured that out, thank you so much!!

 

Anna

[Wernfried Domscheit]

The solution did not work for me however, I found the reason. You must enable "Enhanced Rendering" for your MapInfo.

This you can do either in Menu Options -> Preferences -> Styles -> tick "Enable Enhanced Rendering" or via MapBasic code:

Set Window FrontWindow() Enhanced On

Kind Regards