Remove line through marker in matplotlib legend

Remove line through marker in matplotlib legend

In Matplotlib, you can remove the line through a marker in a legend by setting the line style of the legend entry to "none" or by specifying a custom handler for the legend. Here's how you can achieve this:

Method 1: Set the Line Style to "None"

You can set the line style of the legend entry to "none" using the set_linestyle method of the legend handler associated with the specific line or scatter plot. For example:

import matplotlib.pyplot as plt

# Create a plot with a legend
plt.plot([1, 2, 3], [1, 4, 9], 'ro-', label='Line with Marker')
plt.legend()

# Get the legend handler for the line plot
handler = plt.gca().get_legend().legendHandles[0]

# Set the line style of the legend entry to "none"
handler.set_linestyle('none')

plt.show()

In this example, we first create a plot with a legend entry that includes a line and markers. We then retrieve the legend handler for the line plot using plt.gca().get_legend().legendHandles[0], where 0 is the index of the legend entry we want to modify. Finally, we set the line style of the legend entry to "none" using handler.set_linestyle('none').

Method 2: Specify a Custom Legend Handler

You can also create a custom legend handler to control how the legend entry is displayed. Here's an example:

import matplotlib.pyplot as plt
from matplotlib.legend_handler import HandlerTuple

# Define a custom legend handler that removes the line
class HandlerNoLine(HandlerTuple):
    def create_artists(self, legend, orig_handle,
                       xdescent, ydescent, width, height, fontsize, trans):
        # Call the parent class method to create the legend markers
        artists = super().create_artists(legend, orig_handle,
                                         xdescent, ydescent, width, height, fontsize, trans)
        # Remove the line from the legend markers
        artists[0].set_linestyle('none')
        return artists

# Create a plot with a legend
plt.plot([1, 2, 3], [1, 4, 9], 'ro-', label='Line with Marker')
plt.legend(handler_map={plt.Line2D: HandlerNoLine()})

plt.show()

In this example, we define a custom legend handler HandlerNoLine that inherits from HandlerTuple. This custom handler removes the line from the legend entry while keeping the markers. We then use plt.legend(handler_map={plt.Line2D: HandlerNoLine()}) to apply this custom legend handler to the legend entry.

Either of these methods will remove the line through the marker in the legend while keeping the marker itself. Choose the method that best fits your needs and coding style.

Examples

  1. How to remove the line through the marker in a Matplotlib legend?

    Description: This code snippet demonstrates how to remove the line through the marker in a Matplotlib legend by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Plotting example data
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Data')

# Removing line through marker in legend
plt.legend(handlelength=0)
plt.show()

  2. Python code to hide the line in the legend for a scatter plot in Matplotlib?

    Description: This code illustrates how to hide the line in the legend for a scatter plot in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Scatter plot example
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.scatter(x, y, label='Scatter Data')

# Removing line in legend for scatter plot
plt.legend(handlelength=0)
plt.show()

  3. How to remove the line from the legend in a Matplotlib plot?

    Description: This snippet demonstrates how to remove the line from the legend in a Matplotlib plot by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, label='Example Data')

# Removing line from legend
plt.legend(handlelength=0)
plt.show()

  4. Python code to eliminate the line in the legend for a plot in Matplotlib?

    Description: This code shows how to eliminate the line in the legend for a plot in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, label='Plot Data')

# Eliminating line in legend
plt.legend(handlelength=0)
plt.show()

  5. How to hide the line but keep the marker in the legend of a Matplotlib plot?

    Description: This snippet demonstrates how to hide the line but keep the marker in the legend of a Matplotlib plot by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Marker Only')

# Hiding line but keeping marker in legend
plt.legend(handlelength=0)
plt.show()

  6. Python code to remove the line but keep the marker in the legend for a plot in Matplotlib?

    Description: This code illustrates how to remove the line but keep the marker in the legend for a plot in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Marker Only')

# Removing line but keeping marker in legend
plt.legend(handlelength=0)
plt.show()

  7. How to remove the line from the legend but keep the marker for a plot in Matplotlib?

    Description: This snippet demonstrates how to remove the line from the legend but keep the marker for a plot in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Marker Only')

# Removing line from legend but keeping marker
plt.legend(handlelength=0)
plt.show()

  8. Python code to delete the line from the legend but keep the marker in Matplotlib?

    Description: This code shows how to delete the line from the legend but keep the marker in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Marker Only')

# Deleting line from legend but keeping marker
plt.legend(handlelength=0)
plt.show()

  9. How to hide the line and marker from the legend in a Matplotlib plot?

    Description: This snippet demonstrates how to hide the line and marker from the legend in a Matplotlib plot by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Hidden')

# Hiding line and marker in legend
plt.legend(handlelength=0)
plt.show()

  10. Python code to remove the line and marker from the legend for a plot in Matplotlib?

    Description: This code illustrates how to remove the line and marker from the legend for a plot in Matplotlib by setting the handlelength parameter to zero.

    import matplotlib.pyplot as plt

# Example plot with marker
x = [1, 2, 3, 4, 5]
y = [1, 4, 9, 16, 25]
plt.plot(x, y, marker='o', linestyle='-', label='Hidden')

# Removing line and marker from legend
plt.legend(handlelength=0)
plt.show()

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