Marker Styles

Mix markers with strokes, fills, and offsets to encode categories or emphasis without clutter.

import matplotlib.pyplot as plt
import numpy as np

import dartwork_mpl as dm

# Apply scientific style preset
dm.style.use("scientific")

# Generate data
np.random.seed(42)
x = np.arange(0, 11, 1)
y1 = 5 + np.random.randn(11) * 0.5
y2 = 7 + np.random.randn(11) * 0.5
y3 = 9 + np.random.randn(11) * 0.5
y4 = 11 + np.random.randn(11) * 0.5

# Create figure
# Double column figure: 17cm width, 2x2 layout
fig = plt.figure(figsize=(dm.cm2in(16), dm.cm2in(12)), dpi=300)

# Create GridSpec for 2x2 subplots
gs = fig.add_gridspec(
    nrows=2,
    ncols=2,
    left=0.08,
    right=0.98,
    top=0.95,
    bottom=0.08,
    wspace=0.3,
    hspace=0.4,
)

# Panel A: Basic marker styles
ax1 = fig.add_subplot(gs[0, 0])
ax1.plot(x, y1, "o-", color="oc.red5", lw=0.5, ms=3, label="Circle")
ax1.plot(x, y2, "s-", color="oc.blue5", lw=0.5, ms=3, label="Square")
ax1.plot(x, y3, "^-", color="oc.green5", lw=0.5, ms=3, label="Triangle")
ax1.plot(x, y4, "D-", color="oc.orange5", lw=0.5, ms=2.5, label="Diamond")
ax1.set_xlabel("X value", fontsize=dm.fs(0))
ax1.set_ylabel("Y value", fontsize=dm.fs(0))
ax1.set_title("Basic Markers", fontsize=dm.fs(1))
ax1.legend(loc="best", fontsize=dm.fs(-2), ncol=2, frameon=False)
ax1.set_xticks([0, 2, 4, 6, 8, 10])
ax1.set_yticks([4, 6, 8, 10, 12])

# Panel B: Markers without lines
ax2 = fig.add_subplot(gs[0, 1])
ax2.plot(x, y1, "o", color="oc.red5", ms=4, label="Circle")
ax2.plot(x, y2, "s", color="oc.blue5", ms=4, label="Square")
ax2.plot(x, y3, "^", color="oc.green5", ms=4, label="Triangle")
ax2.plot(x, y4, "v", color="oc.orange5", ms=4, label="Down Triangle")
ax2.set_xlabel("X value", fontsize=dm.fs(0))
ax2.set_ylabel("Y value", fontsize=dm.fs(0))
ax2.set_title("Markers Only", fontsize=dm.fs(1))
ax2.legend(loc="best", fontsize=dm.fs(-2), ncol=2, frameon=False)
ax2.set_xticks([0, 2, 4, 6, 8, 10])
ax2.set_yticks([4, 6, 8, 10, 12])

# Panel C: Filled and empty markers
ax3 = fig.add_subplot(gs[1, 0])
ax3.plot(
    x,
    y1,
    "o-",
    color="oc.blue5",
    lw=0.5,
    ms=4,
    markerfacecolor="oc.blue5",
    label="Filled",
)
ax3.plot(
    x,
    y2,
    "o-",
    color="oc.blue5",
    lw=0.5,
    ms=4,
    markerfacecolor="white",
    markeredgewidth=0.5,
    label="Empty",
)
ax3.plot(
    x,
    y3,
    "s-",
    color="oc.red5",
    lw=0.5,
    ms=4,
    markerfacecolor="oc.red5",
    label="Filled Square",
)
ax3.plot(
    x,
    y4,
    "s-",
    color="oc.red5",
    lw=0.5,
    ms=4,
    markerfacecolor="white",
    markeredgewidth=0.5,
    label="Empty Square",
)
ax3.set_xlabel("X value", fontsize=dm.fs(0))
ax3.set_ylabel("Y value", fontsize=dm.fs(0))
ax3.set_title("Filled vs Empty", fontsize=dm.fs(1))
ax3.legend(loc="best", fontsize=dm.fs(-2), ncol=2, frameon=False)
ax3.set_xticks([0, 2, 4, 6, 8, 10])
ax3.set_yticks([4, 6, 8, 10, 12])

# Panel D: Various marker sizes
ax4 = fig.add_subplot(gs[1, 1])
ax4.plot(x, y1, "o-", color="oc.green5", lw=0.5, ms=2, label="MS=2")
ax4.plot(x, y2, "o-", color="oc.green5", lw=0.5, ms=3.5, label="MS=3.5")
ax4.plot(x, y3, "o-", color="oc.green5", lw=0.5, ms=5, label="MS=5")
ax4.plot(x, y4, "o-", color="oc.green5", lw=0.5, ms=6.5, label="MS=6.5")
ax4.set_xlabel("X value", fontsize=dm.fs(0))
ax4.set_ylabel("Y value", fontsize=dm.fs(0))
ax4.set_title("Different Sizes", fontsize=dm.fs(1))
ax4.legend(loc="best", fontsize=dm.fs(-2), ncol=2, frameon=False)
ax4.set_xticks([0, 2, 4, 6, 8, 10])
ax4.set_yticks([4, 6, 8, 10, 12])

# Optimize layout
dm.simple_layout(fig, gs=gs)

# Save and show plot
plt.show()