arrows

arrows(cmd0::String="", arg1=nothing; arrow=(...), kwargs...)

Plot an arrow field.

When the keyword arrow=(...) or vector=(...) is used, the direction (in degrees counter-clockwise from horizontal) and length must be found in columns 3 and 4, and size, if not specified on the command-line, should be present in column 5. The size is the length of the vector head. Vector stem width is set by option pen or line_attrib.

The vecmap=(...) variation is similar to above except azimuth (in degrees east of north) should be given instead of direction. The azimuth will be mapped into an angle based on the chosen map projection. If length is not in plot units but in arbitrary user units (e.g., a rate in mm/yr) then you can use the input_col option to scale the corresponding column via the +sscale modifier.

The geovec=(...) or geovector=(...) keywords plot geovectors. In geovectors, azimuth (in degrees east from north) and geographical length must be found in columns 3 and 4. The size is the length of the vector head. Vector width is set by pen or line_attrib. Note: Geovector stems are drawn as thin filled polygons and hence pen attributes like dashed and dotted are not available. For allowable geographical units, see the units=() option.

The full arrow options list can be consulted at Vector Attributes

• B or axes or frame
  Set map boundary frame and axes attributes. Default is to draw and annotate left, bottom and vertical axes and just draw left and top axes. More at [frame](../common_opts/opt_B.html)

• J or proj or projection : – proj=
  Select map projection. More at [proj](../common_opts/opt_J.html)

• R or region or limits : – limits=(xmin, xmax, ymin, ymax) | limits=(BB=(xmin, xmax, ymin, ymax),) | limits=(LLUR=(xmin, xmax, ymin, ymax),units=“unit”) | …more
  Specify the region of interest. More at [limits](../common_opts/opt_R.html). For perspective view view, optionally add zmin,zmax. This option may be used to indicate the range used for the 3-D axes. You may ask for a larger w/e/s/n region to have more room between the image and the axes.

• W or pen=pen
  Set pen attributes for the arrow stem [Defaults: width = default, color = black, style = solid]. See [Pen attributes](../common_features/pens.html) and [Vector attributes](../common_features/arrows_control.html) for arrow line terminations.

• U or time_stamp : – time_stamp=true | time_stamp=(just=“code”, pos=(dx,dy), label=“label”, com=true)
  Draw GMT time stamp logo on plot. More at [timestamp](../common_opts/opt_U.html)

• V or verbose : – verbose=true | verbose=level
  Select verbosity level. More at [verbose](../common_opts/opt_V.html)

• X or xshift or x_offset : xshift=true | xshift=x-shift | xshift=(shift=x-shift, mov=“a|c|f|r”)
  Shift plot origin. More at [xshift](../common_opts/opt_X.html)

• Y or yshift or y_offset : yshift=true | yshift=y-shift | yshift=(shift=y-shift, mov=“a|c|f|r”)
  Shift plot origin. More at [yshift](../common_opts/opt_Y.html)

• figname or savefig or name : – figname=name.png
  Save the figure with the figname=name.ext where ext chooses the figure image format.

Examples

using GMT

arrows([0 8.2 0 6], limits=(-2,4,0,9), arrow=(len=2,stop=1,shape=0.5,fill=:red),
       axis=:a, pen="6p", show=true)