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53 lines
1.3 KiB
Markdown
53 lines
1.3 KiB
Markdown
# Bezier
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Create bezier curves, sample them at arbitrary points, and easily plot them.
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Call with either a list of ordered pairs: `Bezier([(x0,y0), (x1,y1), ... , (xn,yn)])`
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or a seperate list of x and y coordinates: `Bezier([x0, x1, ... , xn], [y0, y1, ... , yn])`
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## Optional Parameters:
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### points=False
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If points is `False`, `Bezier` returns `(x, y)`, where x and y are lists of x and y coordinates, respectively.
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If points is `True`, `Bezier` returns `[(x0, y0), (x1, y1), ... , (xn, yn)]`.
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### step=1e-3
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When slicing Bezier, if a step size is not provided this is used instead.
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## Using Bezier
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After creating the curve, retrieve points using the `__getitem__` function, similar to indexing a list.
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```python
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import bezier
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bez = bezier.Bezier([1,3,4],[2,4,3])
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x,y = bez[.2]
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```
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You can also slice `Bezier` to return several values at once. `start` and `stop` default to 0 and 1 respectively (or 1 and 0 if `step` is negative) and `step` will default to the value set at instanciation.
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```python
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x,y = bez[.1:.6:.001]
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x,y = bez[::.01]
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```
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An empty slice object will return the entire curve (at the reolution set by `step`), which provies a quick way to plot the entire curve.
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```python
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import matplotlib.pyplot as plt
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x,y = bez[:]
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plt.plot(x, y)
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```
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Or, more succinctly:
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```python
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plt.plot(*bez[:])
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```
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