Symbolize Areas By RGB Column Values

joebocop

I have imported a SHP file of polygon features. Each polygon has an R, G and B value, representing the colour that should be used to style the area background.

How can I use these values to tell GlobalMapper 18.1 (b022117) which colour to use as a background style for each feature?

Thank you.

bmg_bob

Hello,

joebocop said:

I have imported a SHP file of polygon features. Each polygon has an R, G and B value, representing the colour that should be used to style the area background.

How can I use these values to tell GlobalMapper 18.1 (b022117) which colour to use as a background style for each feature?

You can combine your R, G, and B attributes into a single attribute called FILL_COLOR, then save your data as a shapefile and reload it into Global Mapper.  When the data is imported, Global Mapper will use the FILL_COLOR attribute to style the areas.

To combine the attributes, you can use Layer | Calculate/Copy Attribute Values. On the Attribute Calculation Setup screen, after you type the attribute name (FILL_COLOR), choose the option to Use Formula Calculation, choose String for the Calculation Mode, and type the following information in the Enter Formula field:

"RGB(" + R + "," + G + "," + B + ")"

This assumes that your color attributes are called R, G, and B.  If they have different names, use those instead.

After you modify the data, you will need to export the file, then import it again, because Global Mapper applies the style from attribute values when it imports the data.

Cheers,
Bob

joebocop

Ok, failing that, I see that in a gm_layer_style file the format is as...

GM LAYER STYLE FILE

LayerStyle=2

Type=0

AttrName=G_ROCKTYPE

InterpolateNumeric=1

AttrVal=breccia

AttrAreaStyle=65,0,1,2097152,0.0

AttrFont=~0~534799372~0.000~0~0~16777215

AttrVal=carbonate

AttrAreaStyle=2147483713,0,1,2097152,0.0

AttrFont=~0~534799372~0.000~0~0~16777215

In this example, for the AttrAreaStyle variable, what do the comma-separated values signify? Presumably I could write a script that will output this file, if I can figure out how to convert Red, Green, and Blue values into that comma-separated string.

Thank you!