UML and or ERD editor

Hello World!
I am considering to build a program from scratch. Basicaly it's an ERD or maybe a UML editor. I am concern about how to construct the drawing area - for example to display & resize 'shapes' and 'lines' interactively using the mouse, etc. Any advice please?
Thank you for that.

Hi,
Actually U have to go through some open source softwares which are dedicated to draw such programs.
check out the Wikipedia dictionary for "Entity Relationship Diagram".
U can find a lot of programs at Sourceforge.net , with source code.
To support the size and shape problems.
Just make all the diagram using some specific coordinate numbers like x,y and relatively draw all diagram. Which will help u in customizing the size. For lines and other stuff I think u should keep track of everything then calculate the starting angle ending angle etc based on current status and position different of the same and targeted. Its not a difficult task at all.
For more details try looking at above links that might help u.

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