BB___SEGMENT

=SEGMENT= toc //For a discussion of segments, see Getting to grips with Segments by Rod Bird at the Liberty BASIC Programmer's Encyclopedia.//

Description
> In graphics windows and graphicboxes, SEGMENT retrieves the ID number of the current segment and places it in a named variable. Using names to refer to segment IDs is useful for managing different parts of a drawing.

> Some additional commands used with the display of graphics: >> delsegment >> cls >> redraw >> discard >> flush

Syntax
> //This command is NOT case sensitive//. To assign the current segment ID to a variable: The variable name can be used in other parts of your program to refer to this segment ID number.
 * 1)  - a graphics window
 * 2)  - a graphicbox

Hints

 * //**Name or number.**// Segments are automatically numbered starting with #1 as they are created. You can refer to a segment by number, but, often it is useful to give a segment a name that represents what it shows.

Example
An example of the command using a graphics window. code format="lb" nomainwin

WindowWidth=400 WindowHeight=300

open "Segment Demo" for graphics_nsb_nf as #g #g "trapclose [quit]"

'put the pen down #g "down" 'draw a line #g "line 10 50 10 250" 'change color and draw second line #g "color yellow; size 4" #g "line 10 50 300 50" 'save work so far #g "segment blackyellow" #g "flush" 'change color add another line #g "color red; size 2" #g "line 10 250 300 50"

confirm "Do you want to save this line?"; yn$

'If the red line will not be saved, discard the current segment; 'then, redraw the screen to remove the red line and show only 'the black and yellow line. Finally, flush the graphics. if yn$="no" then #g "discard; redraw ";blackyellow;"flush"

'If the red line will be saved, flush the graphics to include the red line if yn$="yes" then #g "flush blackyellowred" wait

[quit] close #g end code

Useful Functions
code format="lb" Place a useful function using this keyword here code