Mixing
Altair setting constant label color for bar chart
An example of setting labels for a bar chart in Altair is provided in official website here: https://altair-viz.github.io/gallery/bar_chart_with_labels.html
However, once you want to set the "color" parameter in the bar chart conditioned to a variable, the label colours automatically match the color of the bar which is illustrated below. However, my intention is to have constant label color, like black all the time. This is especially desirable for stacked bar charts if you want to show the label as percentage. It seems like setting "color='black'" in the mark_text does not work here; probably because it is based on "bars" which uses "color" parameter as "year". But I could not find an intuitive way to decouple this parameter.
import altair as alt
from vega_datasets import data
source = data.wheat()
bars = alt.Chart(source).mark_bar().encode(
x='wheat:Q',
y="year:O",
color='year:O'
)
text = bars.mark_text(
align='left',
baseline='middle',
color='black',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
Bar chart with Variable Label Colors
Stacked Bar Chart Example with coloured labels
python data-visualization altair
edited Jan 4 at 3:38
jakevdp
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
add a comment |
An example of setting labels for a bar chart in Altair is provided in official website here: https://altair-viz.github.io/gallery/bar_chart_with_labels.html
However, once you want to set the "color" parameter in the bar chart conditioned to a variable, the label colours automatically match the color of the bar which is illustrated below. However, my intention is to have constant label color, like black all the time. This is especially desirable for stacked bar charts if you want to show the label as percentage. It seems like setting "color='black'" in the mark_text does not work here; probably because it is based on "bars" which uses "color" parameter as "year". But I could not find an intuitive way to decouple this parameter.
import altair as alt
from vega_datasets import data
source = data.wheat()
bars = alt.Chart(source).mark_bar().encode(
x='wheat:Q',
y="year:O",
color='year:O'
)
text = bars.mark_text(
align='left',
baseline='middle',
color='black',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
Bar chart with Variable Label Colors
Stacked Bar Chart Example with coloured labels
python data-visualization altair
edited Jan 4 at 3:38
jakevdp
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop thecolor=...in the encoding. Is that what you want or am I missing something?
– FlorianGD
Jan 3 at 9:48
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07
add a comment |
An example of setting labels for a bar chart in Altair is provided in official website here: https://altair-viz.github.io/gallery/bar_chart_with_labels.html
However, once you want to set the "color" parameter in the bar chart conditioned to a variable, the label colours automatically match the color of the bar which is illustrated below. However, my intention is to have constant label color, like black all the time. This is especially desirable for stacked bar charts if you want to show the label as percentage. It seems like setting "color='black'" in the mark_text does not work here; probably because it is based on "bars" which uses "color" parameter as "year". But I could not find an intuitive way to decouple this parameter.
import altair as alt
from vega_datasets import data
source = data.wheat()
bars = alt.Chart(source).mark_bar().encode(
x='wheat:Q',
y="year:O",
color='year:O'
)
text = bars.mark_text(
align='left',
baseline='middle',
color='black',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
Bar chart with Variable Label Colors
Stacked Bar Chart Example with coloured labels
python data-visualization altair
edited Jan 4 at 3:38
jakevdp
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
An example of setting labels for a bar chart in Altair is provided in official website here: https://altair-viz.github.io/gallery/bar_chart_with_labels.html
However, once you want to set the "color" parameter in the bar chart conditioned to a variable, the label colours automatically match the color of the bar which is illustrated below. However, my intention is to have constant label color, like black all the time. This is especially desirable for stacked bar charts if you want to show the label as percentage. It seems like setting "color='black'" in the mark_text does not work here; probably because it is based on "bars" which uses "color" parameter as "year". But I could not find an intuitive way to decouple this parameter.
import altair as alt
from vega_datasets import data
source = data.wheat()
bars = alt.Chart(source).mark_bar().encode(
x='wheat:Q',
y="year:O",
color='year:O'
)
text = bars.mark_text(
align='left',
baseline='middle',
color='black',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
Bar chart with Variable Label Colors
Stacked Bar Chart Example with coloured labels
python data-visualization altair
python data-visualization altair
edited Jan 4 at 3:38
jakevdp
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
edited Jan 4 at 3:38
jakevdp
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
edited Jan 4 at 3:38
jakevdp
20.1k33657
edited Jan 4 at 3:38
jakevdp
20.1k33657
edited Jan 4 at 3:38
jakevdp
20.1k33657
20.1k33657
asked Jan 3 at 1:27
oekicioekici
143
asked Jan 3 at 1:27
oekicioekici
143
asked Jan 3 at 1:27
oekicioekici
143
143
Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop thecolor=...in the encoding. Is that what you want or am I missing something?
– FlorianGD
Jan 3 at 9:48
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07
add a comment |
Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop thecolor=...in the encoding. Is that what you want or am I missing something?
– FlorianGD
Jan 3 at 9:48
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07
Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop the
color=... in the encoding. Is that what you want or am I missing something?– FlorianGD
Jan 3 at 9:48
Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop the
color=... in the encoding. Is that what you want or am I missing something?– FlorianGD
Jan 3 at 9:48
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07
add a comment |
1 Answer
1
active
oldest
votes
When you do bars.mark_text() the resulting chart inherits everything you specified within the bars chart, including the color encoding. To avoid having a color encoding for the text, the best approach is to make sure it doesn't inherit a color encoding.
For example:
import altair as alt
from vega_datasets import data
source = data.wheat()
base = alt.Chart(source).encode(
x='wheat:Q',
y="year:O"
)
bars = base.mark_bar().encode(
color='year:O'
)
text = base.mark_text(
align='left',
baseline='middle',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
The reason mark_text(color='black') didn't override the encoding in your snippet is because the color encoding takes precedence over mark properties, as described in Global Config vs. Local Config vs. Encoding.
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
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oldest
votes
active
oldest
votes
When you do bars.mark_text() the resulting chart inherits everything you specified within the bars chart, including the color encoding. To avoid having a color encoding for the text, the best approach is to make sure it doesn't inherit a color encoding.
For example:
import altair as alt
from vega_datasets import data
source = data.wheat()
base = alt.Chart(source).encode(
x='wheat:Q',
y="year:O"
)
bars = base.mark_bar().encode(
color='year:O'
)
text = base.mark_text(
align='left',
baseline='middle',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
The reason mark_text(color='black') didn't override the encoding in your snippet is because the color encoding takes precedence over mark properties, as described in Global Config vs. Local Config vs. Encoding.
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
add a comment |
When you do bars.mark_text() the resulting chart inherits everything you specified within the bars chart, including the color encoding. To avoid having a color encoding for the text, the best approach is to make sure it doesn't inherit a color encoding.
For example:
import altair as alt
from vega_datasets import data
source = data.wheat()
base = alt.Chart(source).encode(
x='wheat:Q',
y="year:O"
)
bars = base.mark_bar().encode(
color='year:O'
)
text = base.mark_text(
align='left',
baseline='middle',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
The reason mark_text(color='black') didn't override the encoding in your snippet is because the color encoding takes precedence over mark properties, as described in Global Config vs. Local Config vs. Encoding.
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
add a comment |
When you do bars.mark_text() the resulting chart inherits everything you specified within the bars chart, including the color encoding. To avoid having a color encoding for the text, the best approach is to make sure it doesn't inherit a color encoding.
For example:
import altair as alt
from vega_datasets import data
source = data.wheat()
base = alt.Chart(source).encode(
x='wheat:Q',
y="year:O"
)
bars = base.mark_bar().encode(
color='year:O'
)
text = base.mark_text(
align='left',
baseline='middle',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
The reason mark_text(color='black') didn't override the encoding in your snippet is because the color encoding takes precedence over mark properties, as described in Global Config vs. Local Config vs. Encoding.
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
When you do bars.mark_text() the resulting chart inherits everything you specified within the bars chart, including the color encoding. To avoid having a color encoding for the text, the best approach is to make sure it doesn't inherit a color encoding.
For example:
import altair as alt
from vega_datasets import data
source = data.wheat()
base = alt.Chart(source).encode(
x='wheat:Q',
y="year:O"
)
bars = base.mark_bar().encode(
color='year:O'
)
text = base.mark_text(
align='left',
baseline='middle',
dx=3 # Nudges text to right so it doesn't appear on top of the bar
).encode(
text='wheat:Q'
)
(bars + text).properties(height=900)
The reason mark_text(color='black') didn't override the encoding in your snippet is because the color encoding takes precedence over mark properties, as described in Global Config vs. Local Config vs. Encoding.
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
answered Jan 3 at 21:45
jakevdpjakevdp
20.1k33657
20.1k33657
add a comment |
add a comment |
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Hello, I am not sure if I understand what you want correctly : the whole point of setting an encoding color is to map the variable to a color, which will be different for all the levels of your variable. If you want a constant color, just drop the
color=...in the encoding. Is that what you want or am I missing something?– FlorianGD
Jan 3 at 9:48
I added a stacked bar chart example to illustrate the problem. I would like to use "color" encoding in the stacked bar chart to illustrate different components that ends up to 100%. In this scheme, visually it is preferable to have single Label color like black rather than different colors that might blend and lost in the stacked bar chart.
– oekici
Jan 3 at 11:10
If I understand correctly, you want a stacked bar chart with all the colors the same? Something like that but with all the colors the same?
– FlorianGD
Jan 3 at 14:07