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65 lines
2.0 KiB
Markdown
65 lines
2.0 KiB
Markdown
# Contour手册
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使用ContourSet显示自己的轮廓线和多边形的示例。
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```python
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import matplotlib.pyplot as plt
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from matplotlib.contour import ContourSet
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import matplotlib.cm as cm
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```
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每个级别的轮廓线是多边形的列表/元组。
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```python
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lines0 = [[[0, 0], [0, 4]]]
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lines1 = [[[2, 0], [1, 2], [1, 3]]]
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lines2 = [[[3, 0], [3, 2]], [[3, 3], [3, 4]]] # Note two lines.
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```
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两个级别之间的填充等高线也是多边形的列表/元组。点可以顺时针或逆时针排列。
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```python
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filled01 = [[[0, 0], [0, 4], [1, 3], [1, 2], [2, 0]]]
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filled12 = [[[2, 0], [3, 0], [3, 2], [1, 3], [1, 2]], # Note two polygons.
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[[1, 4], [3, 4], [3, 3]]]
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```
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```python
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plt.figure()
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# Filled contours using filled=True.
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cs = ContourSet(plt.gca(), [0, 1, 2], [filled01, filled12], filled=True, cmap=cm.bone)
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cbar = plt.colorbar(cs)
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# Contour lines (non-filled).
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lines = ContourSet(plt.gca(), [0, 1, 2], [lines0, lines1, lines2], cmap=cm.cool,
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linewidths=3)
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cbar.add_lines(lines)
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plt.axis([-0.5, 3.5, -0.5, 4.5])
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plt.title('User-specified contours')
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```
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可以在单个多边形顶点列表中指定多个填充轮廓线以及Path类中描述的顶点种类（代码类型）列表。 这对于带孔的多边形特别有用。 代码类型1是MOVETO，2是LINETO。
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```python
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plt.figure()
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filled01 = [[[0, 0], [3, 0], [3, 3], [0, 3], [1, 1], [1, 2], [2, 2], [2, 1]]]
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kinds01 = [[1, 2, 2, 2, 1, 2, 2, 2]]
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cs = ContourSet(plt.gca(), [0, 1], [filled01], [kinds01], filled=True)
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cbar = plt.colorbar(cs)
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plt.axis([-0.5, 3.5, -0.5, 3.5])
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plt.title('User specified filled contours with holes')
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: contour_manual.py](https://matplotlib.org/_downloads/contour_manual.py)
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- [下载Jupyter notebook: contour_manual.ipynb](https://matplotlib.org/_downloads/contour_manual.ipynb) |