python matplotlib draw shapes (rectangles, circles, etc.)

B station video: https:? //Www.bilibili.com/video/av6989413/ p = 6

Transfer: https: //www.cnblogs.com/linblogs/p/9672769.html

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as mpathes

fig,ax = plt.subplots()
xy1 = np.array([0.2,0.2])
xy2 = np.array([0.2,0.8])
xy3 = np.array([0.8,0.2])
xy4 = np.array([0.8,0.8])
#圆形
circle = mpathes.Circle(xy1,0.05)
ax.add_patch(circle)
#长方形
rect = mpathes.Rectangle(xy2,0.2,0.1,color='r')
ax.add_patch(rect)
#多边形
polygon = mpathes.RegularPolygon(xy3,5,0.1,color='g')
ax.add_patch(polygon)
#椭圆形
ellipse = mpathes.Ellipse(xy4,0.4,0.2,color='y')
ax.add_patch(ellipse)

plt.axis('equal')
plt.grid()
plt.show()

Correlation function introduction
- Circle()
  - Documentation: https: //matplotlib.org/api/_as_gen/matplotlib.patches.Circle.html#matplotlib.patches.Circle
  - Summary: xy of a given radius to create a true circle = (x, y) at
  - Attributes
    - xy: circular central (property name can be omitted)
    - redius: radius of the circle (property name can be omitted)
    - For more detailed document attributes
  - common problem
    - Question: painted circular is not a perfect circle, oval
    - Reason: when the drawing because the x, y-axis ratio is not 1: 1
    - Solution: Use axis property set function 'equal', is set equal to the scaling limit by changing shaft
    - axis Documents: https://matplotlib.org/api/_as_gen/matplotlib.pyplot.axis.html#matplotlib.pyplot.axis
- Rectangle()
  - Documentation: https://matplotlib.org/api/_as_gen/matplotlib.patches.Rectangle.html#matplotlib.patches.Rectangle
  - Introduction: the x, y coordinates to generate a rectangular, (x, y position is the lower left corner of the rectangle)
  - Attributes
    - xy: a rectangular bottom and left coordinate (property name can be omitted)
    - width: rectangle width (attribute name can be omitted, the height and width of the order noted, the second wide)
    - height: the height of the rectangle (property name can be omitted, note that the height and width of the order, the third high)
    - color: fill color
    - For more detailed document attributes
- RegularPolygon()
  - Documentation: https://matplotlib.org/api/_as_gen/matplotlib.patches.RegularPolygon.html#matplotlib.patches.RegularPolygon
  - Introduction: The x, y coordinates generated polygons
  - Attributes
    - xy: center of the polygon (property name can be omitted)
    - numVertices: the number of vertices, or may be called the number of edges (attribute name may be omitted, note position)
    - redus: Polygon radius (attribute name may be omitted, note position)
    - color: fill color
    - For more detailed document attributes
- Ellipse()
  - Documentation: https://matplotlib.org/api/_as_gen/matplotlib.patches.Ellipse.html#matplotlib.patches.Ellipse
  - Description: to generate an oval centered xy
  - Attributes
    - xy: center of the ellipse
    - width: total length of the horizontal axis, (a diameter)
    - height: The total length of the vertical axis (diameter)
    - For more detailed document attributes
- add_patch()
  - Documentation: https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.add_patch.html#matplotlib.axes.Axes.add_patch
  - Introduction: creating a pattern drawn on the canvas,
  - Attributes
    - p: To add a pattern (that is, the return value when creating the pattern)

python matplotlib draw shapes (rectangles, circles, etc.)

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