Query of all color names displayable in the active window.
query_color returns the names of all colors that are useable for region output (disp_region, disp_polygon, disp_circle, etc.). On a b/w screen query_color returns 'black' and 'white'. These two "colors" are displayable on any screen. In addition to 'black' and 'white' several greyvalues (e.g. 'dim grey') are returned on screens capable of greyvalues. A list of all displayable colors is returned for screens with color lookup table. The returned tuple of colors begins with b/w, followed by the three primaries ('red','green','blue') and several greyvalues. Before opening the first window it is furthermore possible to define the color list with set_system(::'graphic_colors',...:). query_all_colors(:::Colors ) returns a list of all available colors for the set_system(::'graphic_colors',...:) call. For screens with truecolor output the same list is returned by query_color. The list of available colors (to HORUS must not be confused with the list of displayable colors. For screens with truecolor output the available colors are only a small subset of the displayable colors. Colors that are not directly available to HORUS can be chosen manually with set_rgb or set_hsi. If colors are chosen that are known to HORUS but cannot be displayed, HORUS can choose a similar color. To use this faeture, set_check(::'~color':) must be set.
Colors (output_control) |
string-array -> string |
color names. |
open_window(::0,0,-1,-1,'root','invisible','':) > query_color(:::Colors) > close_window(:::) > fwrite_string(::['Displayable colors: ',Farben]:).
query_color returns TRUE, if a window is active. Otherwise an exception is raised.
query_all_colors, set_color, disp_region, open_window, open_textwindow