Scripts/Diagram

Diagram editing prototype

• Draws boxes for items with shadow, title, list of members
• Draws connector lines dynamically between items
• Drags items dynamically updating
• Dragged item is selected with border and shadow style

Implementation details (available j601 beta t)

• uses glwindoworg for local item coordinates
• uses wd 'setinvalid id' for update invoking paint

Notes:

• gl2 (both Windows and Java) incorrectly offsets glpaint by glwindoworg, so explicit glwindoworg 0 0 has to be done
• Java (esp. Mac) setinvalid is slower and jerky, but direct call to paint is fast.
• Direct paint requires glpaint, whereas initial paint (wd 'pshow') and setinvalid do not: this is because system does not know when you are done painting. So the usage pattern for ad hoc painting should be: glpaint @ f_g_paint.

See Also

• JForum:programming/2006-August/002983 Drawing program in J
• BlueJ aa integrated Java environment with diagrams and automatic code generation