graphics2d: scale now modifies a translation within a picture #40
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NB translation and scaling are not commutative:
1. scaling a translated picture
.circle r |> .translate t |> .scale s
results in a circle centered at `t.dot s`
2. translating a scaled picture
.circle r |> .scale s |> translate t
results in a circle centered at `t`
The window and orbital examples are updated to demo this change
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The scale op now modifies a translation op within a picture.
NB translation and scaling are not commutative:
results in a circle centered at
t.dot sresults in a circle centered at
tThe window and orbital examples are updated to demo this change.
This PR also adds a smoothing parameter to the orbit update function to prevent orbiting bodies flying to infinity.