Removing space between marks in altair visualization

user_16636518 0
Viewed 158

I have a visualization where I am trying to increase mark size and also have them touching (decrease the space in-between the marks) using altair. Is there a way to do this without simply using 'size='? I would like to make this adaptable to a function and not hardcode the size, but have it dependable on the data given.

Here is my current code so far:

alt.Chart(df).mark_square().encode(
x=alt.X('p1:N'),
y=alt.Y('p2:N'),
color=alt.Color('weight:O', legend=alt.Legend(type='symbol'), scale=alt.Scale(scheme='blues'))
               
).properties(
    height=500,
    width=500
 )

My current output:

enter image description here

My intended output I am trying to achieve:

enter image description here

altair python
2 Answers

If you use mark_rect() rather than mark_square() with a nominal or ordinal encoding, the size of each mark will automatically be adjusted to fill the space.

user_29378310

size is propierty from Altair then is used to manipulate Marks size and so it is for point/circle/square, please check altair-viz.github.io/user_guide/marks.html?highlight=mark_square. To show how it could be used through a function I did this:

def plot_mark_squares(df, bandsize=0, size=30, width=500, height=500):  
    alt.Chart(df).mark_square().encode(
    x=alt.X('p1:N'),
    y=alt.Y('p2:N'),
    color=alt.Color('weight:O', legend=alt.Legend(type='symbol'), scale=alt.Scale(scheme='blues'))
    ).properties(
           height=500,
           width=500,
           bandsize=bandsize,
           size=size
    )

plot_mark_squares(df, 0.1, 50)
user_117174810
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