Undo/Redo for deletion && updating selection

Today we implemented undo/redo for delete operation. Likewise, we proceeded with undo/redo for move operation. Successfully implemented it for point entity. Saving the file also showed the updated coordinates of point. Moving the other entities resulted in inconsistent pushing of positions to the undo stack. Since the other entities need more information to be pushed to the stack, not figured this out yet.

Another issue came by. An item if deleted from the scene got saved because the list being iterated in the writeStream() method keeps a record of all the entities that were once added to the scene. Getting surprises daily. 😉

Also the entities’ properties have been set while one or more of them is selected. The points’ color is changed when selected. A dotted pattern has been implemented showing the selection of other entities accompanied by a change in the color of the points associated with the same entity, say center point for circle, likewise for line and ellipse too.

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