1.3 KiB
In TextFunge you can optionally define a read- and writable display area.
program example_01 : display[16, 16]
The display has a width and a height and every field has initially the value you set in the options (the standard is space).
You can access the display with the display[x, y] command.
display[0, 0] = 'X'; // Write 'X' to position (0,0)
c = display[0, 1]; // Set c to the value of (0,1)
There are also a few automatically defined constants for teh work with displays:
DISPLAY_WIDTH // The width of the display
DISPLAY_HEIGHT // The height of the display
DISPLAY_SIZE // The size (width*height) of the display
You can use the display to
- display information to the user without using input commands
- gather a big amount of data from the user before execution (he has to fill the display manually)
- use it as a big 2-dimensional array for calculations
Note:
Beware that there is normally no mechanism to control access overflow.
So you can enter to high/low x/y values and access/modify program pieces that are not part of the display.
This is a way of bricking your program by writing in the area of program codeTip:
You can prevent this by enabling the compiler option Prevent display overflow. But beware that tis will result in longer display access times.