Query of possible graphic modes.
query_insert returns the possible modes pixels can be displayed in the output window. New pixels may e.g. overwrite old ones. In most of the cases there is a functional relationship between old and new values.
Possible display functions: 'copy' overwrite displayed pixels 'xor' display old "xor" new pixels 'not' complement displayed pixels
"copy" is always available.
Mode (output_control) |
string-array -> string |
display function name. |
query_insert returns TRUE, if a window is active. Otherwise an exception is raised.