How to create candlestick chart using matplotlib only

Question

I have a problem with displaying vlines in the place where the body of the candle is very small. Maybe someone has already solved a similar problem.

fig, axs = plt.subplots(1)

fig.set_size_inches(12.0, 6.0)

axs.vlines(df.index, df['Start_g'], df['End_g'], color='green', linestyle='-', lw=10)
axs.vlines(df.index, df['Start_r'], df['End_r'], color='red', linestyle='-', lw=10)

axs.vlines(df.index, df['Low_g'], df['High_g'], color='green', linestyle='-', lw=1)
axs.vlines(df.index, df['Low_r'], df['High_r'], color='red', linestyle='-', lw=1)

plt.show()

I tried setting dpi to 200 fig.set_dpi(200), it helps but the candles overlap each other

Can you please post a minimum reproducible example?

medium-dimensional
– medium-dimensional

2022-10-29 17:42:29 +00:00
Commented Oct 29, 2022 at 17:42 — medium-dimensional
– medium-dimensional, Commented Oct 29, 2022 at 17:42

Michael · Accepted Answer · 2022-10-31 11:07:37Z

To display the body of the candle I used a Rectangle and to display Low and High I used Line2D

Input data should be pandas.DataFrame with columns Open High Low Close

df = df[['Open', 'High', 'Low', 'Close']]


import numpy as np
import matplotlib.patches as mpatches
from matplotlib.collections import PatchCollection
import matplotlib.lines as mlines
import matplotlib.pyplot as plt


def create_collection(df):
    
    l = len(df)

    grid = []
    height = []
    colors = []
    
    for i in range(l):
        if df.loc[i, 'Close'] > df.loc[i, 'Open']:
            grid.append([i, df.loc[i, 'Open']])
            height.append(df.loc[i, 'Close'] - df.loc[i, 'Open'])
            colors.append('green')
        elif df.loc[i, 'Close'] < df.loc[i, 'Open']:
            grid.append([i, df.loc[i, 'Close']])
            height.append(df.loc[i, 'Open'] - df.loc[i, 'Close'])
            colors.append('red')
    grid = np.array(grid)

    patches = []
    lines = []
    width = 0.5
    
    for i in range(l):
        
        rect = mpatches.Rectangle(grid[i]-[width/2, 0.0], width, height[i])
        patches.append(rect)
        line = mlines.Line2D([i, i], [df.loc[i, 'Low'], df.loc[i, 'High']], lw=0.75, color=colors[i])
        lines.append(line)

    collection = PatchCollection(patches, cmap=plt.cm.hsv)
    collection.set_facecolors([colors[i] for i in range(l)])
    collection.set_linewidth(1.0)
    collection.set_edgecolors([colors[i] for i in range(l)])
    
    return collection, lines

collection, lines = create_collection(df)

fig, axs = plt.subplots()
fig.set_figwidth(640)
fig.set_figheight(320)
fig.set_size_inches(12.0, 6.0)

axs.add_collection(collection)
[axs.add_line(lines[i]) for i in range(len(df))]

plt.axis('auto')
plt.show()

output here

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