ProjectQ-Framework / ProjectQ / 1420

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Matplotlib drawer backend (#352)

* Adding tutorials directory

* test

* BV Algorithm

* add Matplotlib circuit drawer backend, this version works for H, CNOT, and Multi-CNOT.

* Delete the added unnecessary attributes in Command object

* Create the CircuitDrawerMatplotlib Class to handles drawing with matplotlib

* Deleted tutorials/.gitkeep

* update

* fix measurement gate

* Delete unrelated files.

* fix Toffoli gate position issue and change the qubit position from 'str' to 'int'

* Pytest for drawer_mpl

* Tests for _plot function

* Fix the R(angle) gate drawing

* added test for is_available and QFT gate

* fix drawing distance between gates when gate_length >2

* new test png for pytest mpl

* added Swap gates and CSwap gate with multi-control and multi-target.

* update test and comments

* Address comments in _drawer.py

* Reindent and reformat parts of _drawer.py

* Address comments in _plot.py

- Minor tweaks, code cleanup, rewrites, etc.

* Reindent and reformat _plot.py

* update tests

* Move matplotlib drawer into its own file + add test coverage

* Use regular expressions to rewrite and shorten gate names

* Change internal storage format for CircuitDrawerMatplotlib

* Better graphics and adapt plot functions to new internal format

- Support for new internal format
- Resulting quantum circuit figure whould work better with scaling
- Large quantum circuits will now result in wider figure instead of
  squeezing everything into the default matplotlib size
- Some support for multi-target qubit gates
- General code cleanup
- Dropped support for double lines when qubit is in classical state

* Complete test coverage + add some checks for to_draw() inputs

* Compatibility with matplotlib 2.2.3

* Remove compatibility code for MacOSX.

Use local matplotlibrc if necessary instead.

* Add matplotlib dependency to requirements.txt

* Fix non-UTF8 character in file
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