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How to get pixel coordinates for Matplotlib-generated scatterplot?
To get pixel coordinates for matplotlib-generated scatterplot, we can take the following steps −
- Set the figure size and adjust the padding between and around the subplots.
- Initialize a variable "n" to hold the number of sample data.
- Create a figure and a set of subplots.
- Make a scatter plot.
- Get the x and y data points using get_data() method.
- Get the pixel value of the plot.
- Get the pixel tranformed data.
- Get the figure width and height in points or pixels
- Print the x and y pixels value.
- To display the figure, use show() method.
Example
import numpy as np
import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
n = 10
fig, ax = plt.subplots()
points, = ax.plot(np.random.random(n), np.random.random(n), 'r*')
x, y = points.get_data()
pixels = ax.transData.transform(np.vstack([x, y]).T)
x, y = pixels.T
width, height = fig.canvas.get_width_height()
y = height - y
print("The pixel coordinates are: ")
for xp, yp in zip(x, y):
print('{x:0.2f}\t{y:0.2f}'.format(x=xp, y=yp))
plt.show()Output
It will produce the following output
It will also print the pixel coordinates of the matplotlib-generated scatterplot on the console
The pixel coordinates are: 564.93 161.83 446.27 112.60 153.39 247.65 236.90 258.34 519.10 301.04 237.66 118.16 149.71 303.29 386.74 105.81 172.93 121.81 110.94 116.20
Updated on: 22-Sep-2021
1K+ Views
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