Sandglass Pattern plot using python

 

import numpy as np

import matplotlib.pyplot as plt

x = np.linspace(-1, 1, 100)

y_upper = 1 - abs(x)  

y_lower = abs(x) - 1  

fig, ax = plt.subplots(figsize=(6, 6))

ax.fill_between(x, y_upper, 1, color="royalblue", alpha=0.7)  

ax.fill_between(x, y_lower, -1, color="tomato", alpha=0.7)  

ax.set_xlim(-1.2, 1.2)

ax.set_ylim(-1.2, 1.2)

ax.set_xticks([])

ax.set_yticks([])

ax.set_frame_on(False)

ax.axhline(0, color="black", linewidth=1.2, linestyle="--") 

plt.title("Hourglass Pattern Plot")

plt.show()

#source code --> clcoding.com 

Code Explanation:

Import Necessary Libraries

import numpy as np

import matplotlib.pyplot as plt

numpy is used for numerical operations, such as generating x values.

matplotlib.pyplot is used for visualization.

Define X-Coordinates for the Plot

x = np.linspace(-1, 1, 200)

np.linspace(-1, 1, 200):

Generates 200 evenly spaced values between -1 and 1 for smooth curves.

These values are used for defining the sandglass shape.

Define Y-Coordinates for the Upper and Lower Parts

y_upper = 1 - np.abs(x)  # Top inverted triangle

y_lower = np.abs(x) - 1  # Bottom triangle

y_upper = 1 - np.abs(x):

Defines an inverted triangle (top part of the sandglass).

As x moves from -1 to 1, y_upper decreases from 1 to 0.

y_lower = np.abs(x) - 1:

Defines a regular triangle (bottom part of the sandglass).

As x moves from -1 to 1, y_lower increases from -1 to 0.

Together, they form a symmetrical sandglass shape!

Create the Figure and Set Background

fig, ax = plt.subplots(figsize=(6, 8), facecolor="black")

fig, ax = plt.subplots(figsize=(6, 8)):

Creates a taller figure (6x8) to emphasize the sandglass shape.

facecolor="black":

Sets the background color to black for better contrast.

Apply a Gradient Effect for Depth

for i in range(8):

    alpha = (8 - i) / 8  # Fading effect

    scale = 1 - i * 0.1  # Shrinking effect for layers

    ax.fill_between(x * scale, y_upper * scale, 1 * scale, color="deepskyblue", alpha=alpha)

    ax.fill_between(x * scale, y_lower * scale, -1 * scale, color="orangered", alpha=alpha)

A loop is used to create multiple layers to simulate a gradient depth effect.

alpha = (8 - i) / 8:

Decreases transparency from 1 to 0.1 as layers go deeper.

scale = 1 - i * 0.1:u

Shrinks each layer slightly to create a depth illusion.

fill_between() is used to fill the upper (blue) and lower (red) triangles.

This creates a smooth, glass-like fading effect, making the sandglass look more 3D.

Add a Dashed Symmetry Line

ax.axhline(0, color="white", linestyle="--", linewidth=1.2, alpha=0.6)

axhline(0): Draws a horizontal dashed line at y = 0.

This emphasizes symmetry and gives a structured appearance.

Remove Axis Details for a Clean Look

ax.set_xlim(-1.2, 1.2)

ax.set_ylim(-1.2, 1.2)

ax.set_xticks([])

ax.set_yticks([])

ax.set_frame_on(False)

set_xlim(-1.2, 1.2) / set_ylim(-1.2, 1.2):

Expands axes slightly for better visibility.

set_xticks([]) / set_yticks([]):

Removes axis labels to make the plot cleaner.

set_frame_on(False):

Removes the frame/border for a sleek look.

Add a Title and Show the Plot

ax.set_title("Sandglass Pattern Plot ", fontsize=14, fontweight="bold", color="white", pad=15)

plt.show()

Adds a bold, centered title with white color.

plt.show(): Displays the final sandglass plot.