Add type information

[amolenaar]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation content changes

What is the current behavior?

Make gaphas somewhat (type) saver.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.01%.

Quality metrics	Before	After	Change
Complexity	1.49 ⭐	1.48 ⭐	-0.01 👍
Method Length	39.34 ⭐	39.32 ⭐	-0.02 👍
Working memory	5.51 ⭐	5.52 ⭐	0.01 👎
Quality	87.76% ⭐	87.75% ⭐	-0.01% 👎

Other metrics	Before	After	Change
Lines	6250	6271	21

Changed files	Quality Before	Quality After	Quality Change
examples/demo.py	89.08% ⭐	89.17% ⭐	0.09% 👍
gaphas/aspect.py	93.90% ⭐	93.90% ⭐	0.00%
gaphas/canvas.py	90.42% ⭐	90.32% ⭐	-0.10% 👎
gaphas/constraint.py	85.10% ⭐	85.08% ⭐	-0.02% 👎
gaphas/decorators.py	82.27% ⭐	82.29% ⭐	0.02% 👍
gaphas/guide.py	84.08% ⭐	84.20% ⭐	0.12% 👍
gaphas/item.py	89.21% ⭐	89.06% ⭐	-0.15% 👎
gaphas/painter.py	88.90% ⭐	88.90% ⭐	0.00%
gaphas/quadtree.py	87.53% ⭐	87.53% ⭐	0.00%
gaphas/segment.py	70.82% 🙂	76.30% ⭐	5.48% 👍
gaphas/solver.py	92.75% ⭐	92.49% ⭐	-0.26% 👎
gaphas/table.py	74.43% 🙂	74.43% 🙂	0.00%
gaphas/tool.py	83.62% ⭐	83.60% ⭐	-0.02% 👎
gaphas/tree.py	90.74% ⭐	90.40% ⭐	-0.34% 👎
gaphas/view.py	85.81% ⭐	85.76% ⭐	-0.05% 👎
tests/conftest.py	91.33% ⭐	91.33% ⭐	0.00%
tests/test_element.py	84.64% ⭐	84.64% ⭐	0.00%
tests/test_pickle.py	88.92% ⭐	88.92% ⭐	0.00%
tests/test_state.py	91.92% ⭐	91.92% ⭐	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
examples/demo.py	create_window	9 🙂	1001 ⛔	15 😞	33.07% 😞	Try splitting into smaller methods. Extract out complex expressions
gaphas/constraint.py	EquationConstraint._solve_for	23 😞	149 😞	12 😞	39.46% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
gaphas/view.py	GtkView.update_back_buffer	14 🙂	221 ⛔	12 😞	40.08% 😞	Try splitting into smaller methods. Extract out complex expressions
gaphas/painter.py	HandlePainter._draw_handles	15 🙂	206 ⛔	12 😞	40.27% 😞	Try splitting into smaller methods. Extract out complex expressions
gaphas/view.py	GtkView.update_adjustments	6 ⭐	206 ⛔	15 😞	44.15% 😞	Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it by mentioning @sourcery-ai in a comment.