There are software with the help of which we can draw diagrams easily. However, there may be some things missing in it, like angle marks, arrows in between vertices etc. Being LaTeX user we also wish to use LaTeX math mode to label diagrams, for that one may require to edit the diagram. Now–a–days, many figure drawing tools has option of exporting file in PSTricks. Which then generates, PSTricks code for the figure, in a simple LaTeX format. Which is readable and editable. It makes the job easy and efficient.