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Fixes https://github.com/adafruit/circuitpython/issues/3170
The absolute transform needs to be subtracted in all cases, not
only when the coordinate system is transposed.
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This can be enforced by pre-commit, but correct it separately to make it easier to review.
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VectorShape tells the Group to redraw whatever it left behind when it is removed now.
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VectorShape now just uses the Group's and Display's absolute transforms.
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Rather than maintain a transform per-shape, we'll just use whatever
settings are on the Display. Currently only transpose is done.
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vectorio builds on m4 express feather
Concrete shapes are composed into a VectorShape which is put into a displayio Group for display.
VectorShape provides transpose and x/y positioning for shape implementations.
Included Shapes:
* Circle
- A radius; Circle is positioned at its axis in the VectorShape.
- You can freely modify the radius to grow and shrink the circle in-place.
* Polygon
- An ordered list of points.
- Beteween each successive point an edge is inferred. A final edge closing the shape is inferred between the last
point and the first point.
- You can modify the points in a Polygon. The points' coordinate system is relative to (0, 0) so if you'd like a
top-center justified 10x20 rectangle you can do points [(-5, 0), (5, 0), (5, 20), (0, 20)] and your VectorShape
x and y properties will position the rectangle relative to its top center point
* Rectangle
A width and a height.
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