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Hi, I have defined from plotnine import *
import polars as pl
import geopandas as gp
def overlay_color(rgb_hex_colors, light="white", dark="black", threshold=0.5):
"""
Decide which color is suitable to write onto the given colors
"""
def luminance(rgb_hex):
"""
Calculate the Luminance ([0, 1]) of a hex color
"""
r = int(rgb_hex[1:3], 16)
g = int(rgb_hex[3:5], 16)
b = int(rgb_hex[5:], 16)
luma = (r*0.299 + g*0.587 + b*0.0722) / 256
return luma
return [light if luminance(x) < threshold else dark for x in rgb_hex_colors]But when I run I have this error. What's wrong in my code?? Thank you |
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Answered by
has2k1
Dec 7, 2024
Replies: 3 comments 6 replies
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I have added this and edited the geom_text And it works. But why can't I use the code in the plotnine example? |
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0 replies
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color=stage("costo_per_km2", after_scale="overlay_color(color)")Should be in a mapping i.e. In the |
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2 replies
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Hi @has2k1 thank you very much, it works. But I have the opposite result: 1) light text on light background and 2) dark text on dark background.
Detailseo_df = gp.read_file("https://gist.githubusercontent.com/aborruso/62a708faa4c050776ece5fb4a33b4593/raw/7a99636eac7a3d9844f6c54b2cacbc9ae6023e4a/oc_costo_regioni.geojson")
# Reproject to EPSG:32633
eo_df = eo_df.to_crs(epsg=3857)
# Calculate the center of each region
eo_df['center_lon'] = eo_df.geometry.centroid.x
eo_df['center_lat'] = eo_df.geometry.centroid.y
# Calcola il costo per km2
eo_df['costo_per_km2'] = eo_df['costo_per_km2'].apply(lambda x: round(x / 100) * 100)
eo_df['costo_per_km2_formatted'] = eo_df['costo_per_km2'].apply(format_label)
def overlay_color(rgb_hex_colors, light="white", dark="black", threshold=0.5):
"""
Decide which color is suitable to write onto the given colors
"""
def luminance(rgb_hex):
"""
Calculate the Luminance ([0, 1]) of a hex color
"""
r = int(rgb_hex[1:3], 16)
g = int(rgb_hex[3:5], 16)
b = int(rgb_hex[5:], 16)
luma = (r*0.299 + g*0.587 + b*0.0722) / 256
return luma
return [light if luminance(x) < threshold else dark for x in rgb_hex_colors]
(
ggplot(eo_df)
+ geom_map(aes(fill="costo_per_km2"), color="black", size=0.1)
+ scale_fill_cmap(cmap_name="YlOrRd")
+ geom_text(
aes("center_lon", "center_lat", label="DEN_REGIONE",color=stage("costo_per_km2", after_scale="overlay_color(color)")), size=6,
)
+ labs(fill="Costo €/km²")
+ theme(
panel_background=element_rect(fill="white"),
panel_grid=element_blank(),
axis_text=element_blank(),
axis_ticks=element_blank(),
axis_title=element_blank(),
)
) |
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Hi @has2k1 , I figured out why, I need to remove Is there a way to apply Thank you |
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Answer selected by
aborruso
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Just change color to fill. fill=stage("costo_per_km2", after_scale="overlay_color(fill)") |
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4 replies
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Thank you very much |
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If I do it I have eo_df = gp.read_file("https://gist.githubusercontent.com/aborruso/62a708faa4c050776ece5fb4a33b4593/raw/7a99636eac7a3d9844f6c54b2cacbc9ae6023e4a/oc_costo_regioni.geojson")
# Reproject to EPSG:32633
eo_df = eo_df.to_crs(epsg=3857)
# Calculate the center of each region
eo_df['center_lon'] = eo_df.geometry.centroid.x
eo_df['center_lat'] = eo_df.geometry.centroid.y
# Calcola il costo per km2
eo_df['costo_per_km2'] = eo_df['costo_per_km2'].apply(lambda x: round(x / 100) * 100)
eo_df['costo_per_km2_formatted'] = eo_df['costo_per_km2'].apply(format_label)
def overlay_color(rgb_hex_colors, light="white", dark="black", threshold=0.5):
"""
Decide which color is suitable to write onto the given colors
"""
def luminance(rgb_hex):
"""
Calculate the Luminance ([0, 1]) of a hex color
"""
r = int(rgb_hex[1:3], 16)
g = int(rgb_hex[3:5], 16)
b = int(rgb_hex[5:], 16)
luma = (r*0.299 + g*0.587 + b*0.0722) / 256
return luma
return [light if luminance(x) < threshold else dark for x in rgb_hex_colors]
(
ggplot(eo_df)
+ geom_map(aes(fill="costo_per_km2"), color="black", size=0.1)
+ scale_fill_cmap(cmap_name="YlOrRd")
+ geom_text(
aes("center_lon", "center_lat", label="DEN_REGIONE",color=stage("costo_per_km2", after_scale="overlay_color(fill)")), size=6,
)
+ labs(fill="Costo €/km²")
+ theme(
panel_background=element_rect(fill="white"),
panel_grid=element_blank(),
axis_text=element_blank(),
axis_ticks=element_blank(),
axis_title=element_blank(),
)
) |
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You could add a color scale that matches the fill scale, or you can tell the fill scale to apply to the color as well. e.g. + scale_fill_cmap(cmap_name="YlOrRd", aesthetics=("fill", "color"))
+ geom_text(
aes("center_lon", "center_lat", label="DEN_REGIONE",color=stage("costo_per_km2", after_scale="overlay_color(color)")), size=6,
) |
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hi @has2k1 , it works, thank you. Essentially to make my code work you added But that's okay, I'll try to study and reflect, to understand a little better. Thank you. |
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Should be in a mapping i.e. In the
aes()call.