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Merged
merged 7 commits into from
Oct 24, 2020
Merged

Improve the gallery example for line styles #664

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10f7cc6
Improve the gallery example for line styles
seisman Oct 16, 2020
5c828a8
Improve the comment
seisman Oct 23, 2020
1550022
Update examples/gallery/line/linestyles.py
seisman Oct 23, 2020
5b87e06
Merge branch 'master' into improve-linestyle
seisman Oct 24, 2020
99fb1db
Fix a typo and add more comment
seisman Oct 24, 2020
dae7dc8
Merge branch 'master' into improve-linestyle
seisman Oct 24, 2020
77f18fa
Merge branch 'master' into improve-linestyle
seisman Oct 24, 2020
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39 changes: 26 additions & 13 deletions examples/gallery/line/linestyles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,23 +20,36 @@
import numpy as np
import pygmt

# Generate a sample line for plotting
x = np.linspace(0, 10, 500)
y = np.sin(x)
# Generate a two-point line for plotting
x = np.array([0, 7])
y = np.array([9, 9])

fig = pygmt.Figure()
fig.basemap(region=[0, 10, -3, 3], projection="X15c/8c", frame=["xaf", "yaf", "WSrt"])
fig.basemap(region=[0, 10, 0, 10], projection="X15c/8c", frame='+t"Line Styles"')

# Plot the line using the default line style
fig.plot(x=x, y=y)

# Plot the lines using different line styles
fig.plot(x=x, y=y + 1.5, pen="1p,red,-")
fig.plot(x=x, y=y + 1.0, pen="2p,blue,.")
fig.plot(x=x, y=y + 0.5, pen="1p,red,-.")

fig.plot(x=x, y=y - 0.5, pen="2p,blue,..-")
fig.plot(x=x, y=y - 1.0, pen="3p,tomato,--.")
fig.plot(x=x, y=y - 1.5, pen="3p,tomato,4_2:2p")
fig.text(x=x[-1], y=y[-1], text="solid (default)", justify="ML", offset="0.2c/0c")

# plot the line using different line styles
for linestyle in [
"1p,red,-", # dashed line
"1p,blue,.", # dotted line
"1p,lightblue,-.", # dash-dotted line
"2p,blue,..-", # dot-dot-dashed line
"2p,tomato,--.", # dash-dash-dotted line
"2p,tomato,4_2:2p", # A pattern of 4-point-long line segment and 2-point-gap between segment
]:
y -= 1 # Move the current line down
fig.plot(x=x, y=y, pen=linestyle)
fig.text(x=x[-1], y=y[-1], text=linestyle, justify="ML", offset="0.2c/0c")
Comment on lines +35 to +45
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Could we avoid using a for-loop here as there are some things here like y -= 1 and x[-1] which might not be as readable for beginner Python users. It will make the code longer, but I think it's worth showing things more explicitly.

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I think these are very basic syntax even for Python beginners. Perhaps only changing y -= 1 to y = y - 1 is enough?

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@weiji14 weiji14 Oct 23, 2020 •
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How about using a dictionary and doing a for-loop through different y values? Something like

for y, linestyle in {1: "1p,red,-", 2: "1p,blue,.", ...}.items():
    fig.plot(...)
    fig.text(...)

The x values can be hardcoded since they're always the same (0 to 9). Only the y is changing.

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Looping over a dictionary seems a more advanced technique. What about using x[1] and y[1] (or x[0] and y[0] for left-side labels)?

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On second thought, I think the for-loop is fine as is.

Went down a rabbit hole of doing quoted lines following https://docs.generic-mapping-tools.org/latest/cookbook/contour-annotations.html, but somehow I couldn't escape the colon : character on the tomato line:

fig = pygmt.Figure()
fig.basemap(region=[0, 10, 0, 10], projection="X15c/8c", frame='+t"Line Styles"')

# Plot the line using the default line style
fig.plot(x=x, y=y)
fig.text(x=x[-1], y=y[-1], text="solid (default)", justify="ML", offset="0.2c/0c")

## Plot the line using different line styles
# dashed line
fig.plot(x=x, y=y - 1, pen="1p,red,-", style='qn1:+l" 1p,red,- "')
# dotted line
fig.plot(x=x, y=y - 2, pen="1p,blue,.", style='qn1:+l" 1p,blue,. "')

# dash-dotted line
fig.plot(x=x, y=y - 3, pen="1p,lightblue,-.", style='qn1:+l" 1p,lightblue,-. "')
# dot-dot-dashed line
fig.plot(x=x, y=y - 4, pen="2p,blue,..-", style='qn1:+l" 2p,blue,..- "')

# dash-dash-dotted line
fig.plot(x=x, y=y - 5, pen="2p,tomato,--.", style='qn1:+l" 2p,tomato,--. "')
# A pattern of 4-point-long line segment and 2-point-gap between segment
fig.plot(x=x, y=y - 6, pen="2p,tomato,4_2:2p", style=r'qn1:+l" 2p,tomato,4_2\:2p "')
fig.show()

temp


# plot the line like a railway track (black/white)
# the trick here is plotting the same line twice but with different line styles
y -= 1
for linestyle in ["5p,black", "4p,white,20p_20p"]:
fig.plot(x=x, y=y, pen=linestyle)
fig.text(x=x[-1], y=y[-1], text="5p,black", justify="ML", offset="0.2c/0.2c")
fig.text(x=x[-1], y=y[-1], text="4p,white,20p_20p", justify="ML", offset="0.2c/-0.2c")

fig.show()