The MAP_CONTINENTS procedure draws continental boundaries, filled continents, political boundaries, coastlines, and/or rivers, over an existing map projection established by MAP_SET. Outlines can be drawn in low or high-resolution (if the optional high-resolution CIA World Map database is installed). If MAP_CONTINENTS is called without any keywords, it draws low-resolution, unfilled continent outlines.
MAP_SET must be called before MAP_CONTINENTS to establish the projection type, the center of the projection, polar rotation and geographic limits.
Set this keyword to draw coastlines, islands, and lakes instead of the default continent outlines. Note that if you are using the low-resolution map database (if the HIRES keyword is not set), many islands are drawn even when COASTS is not set. If you are using the high-resolution map database (if the HIRES keyword is set), no islands are drawn unless COASTS is set.
Set this keyword to 1 to fill continent boundaries with a solid color. The color is set by the COLOR keyword. Set this keyword to 2 to fill continent boundaries with a line fill. For line filling, the COLOR, MLINESTYLE, MLINETHICK, ORIENTATION, and SPACING keywords can be used to control the type of line fill.
Set this keyword to use high-resolution map data instead of the default low-resolution data. This option is only available if you have installed the optional high-resolution map datasets. If the high-resolution data is not available, a warning is printed and the low-resolution data is used instead.
Set this keyword to the counterclockwise angle in degrees from horizontal that the line fill should be drawn. The default is 0. This keyword only has effect if the FILL_CONTINENTS keyword is set to 2.