Programming continued... vol. 1

Continued my coding tries and added some functionality:

• nodes can be deleted :) with proper edge handling
• inputs-outputs reconnect automatically after node deletion and follow main inputs ("B", the base)
• pressing Ctrl button displays edge break dots (similarly to Nuke) which can be clicked to create new dot nodes
• nodes can be selected with box select and moved together
• edges are displayed with A, B or similar signs if necessary
• when node is selected, all input edges get nicely colored
• when edges are reconnected, graph is evaluated and resulting list is displayed on screen

At first I used QGraphicsView default functions for handling node selection, moving and box selecting but as I built more and more on top of it, I screwed something up. For example, when moving selected nodes, they jumped to strange places. I ended up writing all mouse interaction functions myself. Some things are still broken, for example pressing Ctrl while dragging selectionbox cancels selection but box is not deleted properly.

PS: for some strange reason Photoshop makes printscreen images fuzzy. Paint on the other hand gets them pixel-sharp. Very strange...