Lugaru's Epsilon
Editor 14.04

Epsilon User's Manual and Reference
   Primitives and EEL Subroutines
      Display Primitives
         . . .
         Window Titles and Mode Lines
         Normal Buffer Display
            Screen Dimensions
            Character Display
            Character Widths and Columns
         Displaying Status Messages
         . . .

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Normal Buffer Display  Primitives and EEL Subroutines   Character Display

Epsilon User's Manual and Reference > Primitives and EEL Subroutines > Display Primitives > Normal Buffer Display >

Screen Dimensions

short screen_cols;
short screen_lines;

The screen_cols and screen_lines primitives contain the number of columns and lines on Epsilon's main display (the OS window's size, or the current terminal's size, as appropriate). They are set when Epsilon starts up, using values provided by the operating system (or, for the Windows version, by the registry). Don't set these variables directly. Use the resize_screen( ) primitive described below.

short want_cols;
short want_lines;

The want_cols and want_lines primitives contain the values the user specified through the -vc and -vl switches, respectively, described in Epsilon Command Line Flags. If these variables are 0, it means the user did not explicitly specify the number of lines or columns to display.

term_init()             /* video.e */
term_cmd_line()         /* video.e */
term_mode(int active)   /* video.e */

Epsilon's standard startup code calls the subroutine term_init( ) when you start Epsilon, and term_cmd_line( ) when it wants to change Epsilon's window size to match what the user specified on the command line. (It changes sizes based on the command line after it restores any saved session.) The term_mode( ) subroutine controls switching when you exit Epsilon or run a subprocess. Its argument is 1 when entering Epsilon again (when a shell( ) call returns, for example) and 0 when exiting.

resize_screen(int lines, int cols)

Use the resize_screen( ) primitive to tell Epsilon to display a different number of lines or columns. It scales all the windows to the new screen dimensions, and then sets the screen_lines and screen_cols variables to the new screen size.

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Normal Buffer Display  Primitives and EEL Subroutines   Character Display

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