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file load:
cursor_line = 1
first line is a drawing -> cursor_line = 2
click on text -> cursor moves
click on first character of text -> cursor on first character of text
click to right of text -> cursor past end of line
click to right of wrapped text -> cursor on final character of line
click on drawing -> cursor doesn't move
cursor past end of line -> renders
create drawing -> cursor bumps down below drawing
backspace
cursor_pos == 0, previous line is a drawing -> delete drawing, cursor still visible at start of line
cursor_pos == 0, previous line is text -> join lines, cursor still at same character
drawing
draw a line, circle, rectangle, square, polygon
select a point and move it
select a point and name it
enter
cursor_pos == 0 -> insert empty line above current line
scrolling:
given moby dick, a file containing all text:
page up moves top line on screen to bottom
page down moves bottom line on screen to top
cursor remains on screen
cursor remains on text line
'up' arrow with cursor at top of screen scrolls up one line (drawings still fully in or out)
if cursor line wrapped before, it scrolls up by only one screen line
if previous line (above top of screen) wrapped, it scrolls up by only one screen line
'down' arrow with cursor at bottom of screen scrolls down one line (drawings still fully in or out)
if cursor line wrapped before, it scrolls down by only one screen line
persistence:
draw a line, circle, rectangle, square, polygon, quit, restart. All the shapes you drew should still be visible.
select a point and name it, quit, restart. Name is still visible.
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