Matplotlib is a library in Python and it is a numerical – mathematical extension for the NumPy library. Pyplot is a state-based interface to a Matplotlib module that provides a MATLAB-like interface.
matplotlib.pyplot.gca() Function
The gca() function in pyplot module of matplotlib library is used to get the current Axes instance on the current figure matching the given keyword args, or create one.
Syntax: matplotlib.pyplot.gca(\*\*kwargs)
Parameters: This method does not accepts any parameter.
Returns: This method does not return any value.
Below examples illustrate the matplotlib.pyplot.gca() function in matplotlib.pyplot:
Example #1:
Python3
# Implementation of matplotlib functionimport matplotlib.pyplot as pltimport numpy as npimport matplotlib.gridspec as gridspecfrom mpl_toolkits.axes_grid1 import make_axes_locatableplt.close('all')arr = np.arange(100).reshape((10, 10))fig = plt.figure(figsize =(4, 4))im = plt.imshow(arr, interpolation ="none", cmap ="plasma")divider = make_axes_locatable(plt.gca())cax = divider.append_axes("left", "15 %", pad ="30 %")plt.colorbar(im, cax = cax)fig.suptitle('matplotlib.pyplot.gca() function\Example\n\n', fontweight ="bold")plt.show() |
Output:
Example #2:
Python3
# Implementation of matplotlib functionimport matplotlib.pyplot as pltfrom matplotlib.tri import Triangulationfrom matplotlib.patches import Polygonimport numpy as np def update_polygon(tri): if tri == -1: points = [0, 0, 0] else: points = triang.triangles[tri] xs = triang.x[points] ys = triang.y[points] polygon.set_xy(np.column_stack([xs, ys])) def motion_notify(event): if event.inaxes is None: tri = -1 else: tri = trifinder(event.xdata, event.ydata) update_polygon(tri) plt.title('matplotlib.pyplot.gca() function \ Example\n\n Potion number : % i' % tri, fontweight ="bold") event.canvas.draw()ang = 3radi = 8radii = np.linspace(0.25, 0.95, radi)res = np.linspace(0, 4 * np.pi, ang)res = np.repeat(res[..., np.newaxis], radi, axis = 1)res[:, 1::2] += np.pi / angx = (radii * np.cos(2 * res)).flatten()y = (radii * np.sin(2 * res)).flatten()triang = Triangulation(x, y)triang.set_mask(np.hypot(x[triang.triangles].mean(axis = 1), y[triang.triangles].mean(axis = 1)) < 0.25) trifinder = triang.get_trifinder() plt.subplot(111, aspect ='equal')plt.triplot(triang, 'go-')polygon = Polygon([[0, 0], [0, 0]], facecolor ='r')update_polygon(-1)plt.gca().add_patch(polygon)plt.gcf().canvas.mpl_connect('motion_notify_event', motion_notify) plt.show() |
Output:
