NAME

       d.vect.chart   -  Displays  charts  of  vector  data  in  the active frame on the graphics
       monitor.

KEYWORDS

       display, cartography, chart maps

SYNOPSIS

       d.vect.chart
       d.vect.chart --help
       d.vect.chart     [-cl]     map=name       [type=string[,string,...]]        [layer=string]
       [chart_type=string]     columns=name[,name,...]     [size_column=name]      [size=integer]
       [scale=float]                [outline_color=name]                 [colors=name[,name,...]]
       [max_ref=float[,float,...]]   [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -c
           Center the bar chart around a data point

       -l
           Create legend information and send to stdout

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       map=name [required]
           Name of vector map
           Or data source for direct OGR access

       type=string[,string,...]
           Input feature type
           Options: point, line, boundary, centroid, area
           Default: point,line,boundary,centroid

       layer=string
           Layer number or name
           Vector  features  can have category values in different layers. This number determines
           which layer to use. When used with direct OGR access this is the layer name.
           Default: 1

       chart_type=string
           Chart type
           Options: pie, bar
           Default: pie

       columns=name[,name,...] [required]
           Attribute columns containing data

       size_column=name
           Column used for pie chart size

       size=integer
           Size of chart (diameter for pie, total width for bar)
           Default: 40

       scale=float
           Scale for size (to get size in pixels)
           Default: 1

       outline_color=name
           Outline color
           Either a standard color name or R:G:B triplet
           Default: black

       colors=name[,name,...]
           Colors used to fill charts
           Either a standard color name or R:G:B triplet
           Default: black

       max_ref=float[,float,...]
           Maximum value used for bar plot reference

DESCRIPTION

       d.vect.chart displays charts for GRASS vector data in the active  frame  on  the  graphics
       monitor.

NOTES

       The charts are positioned as follows:

           •   vector points: on point position,

           •   vector lines: on line centers,

           •   vector areas: on area centroids.
       Bar  charts are placed with their lower edge starting from the y-coordinate of the feature
       being symbolized, and centered with respect to the x-coordinate.  The -c flag can be  used
       to center the bar chart in both x and y directions.

       The ’sizecol’ parameter is proportionate to the radius.

       The  optional  max_ref parameter accepts a list of values that represent the maximum value
       for each column listed in the values for the parameter columns. These values are  used  to
       create a framed bar plot if chart_type is bar (See Example 2).

EXAMPLES

   Example 1
       Pie-chart of monthly winter precipitation (North Carolina sample dataset):
       g.region vector=nc_state -p
       d.vect nc_state
       d.vect.chart precip_30ynormals chart_type=pie columns=nov,dec,jan,feb -l
       2D pie-chart of monthly winter precipitation in North Carolina

   Example 2
       Bar-chart of different census map values:
       d.vect.chart map=vectmap columns=cens51,cens61,cens71,cens81 chart_type=bar

   Example 3
       Creation of framed bar charts of an erodibiliy index from the Spearfish sample dataset:
       g.region raster=erode.index -p
       r.to.vect -s input=erode.index output=erode_index type=area
       v.extract input=erode_index output=erode_index_ctrds type=centroid
       d.rast aspect
       d.vect.chart map=erode_index_ctrds chart_type=bar columns=cat \
                    size=10 max_ref=12 scale=0.05 colors=yellow
       d.vect erode_index_ctrds icon=basic/circle fcol=black col=black size=5
       Bar charts of an erodibiliy index (spatial subset)

SEE ALSO

        d.erase, d.vect, d.vect.thematic, d.what.vect, d.rast

AUTHOR

       Radim Blazek, ITC-Irst, Trento, Italy

       Last changed: $Date: 2015-03-15 21:22:17 +0100 (Sun, 15 Mar 2015) $

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       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual